Table of Contents
This status table is based on the table of contents of ISO/IEC 14882:2003.
This page describes the C++ support in the GCC 9 series.
Table 1.1. C++ 1998/2003 Implementation Status
| Section | Description | Status | Comments |
|---|---|---|---|
| 18 | Language support | ||
| 18.1 | Types | Y | |
| 18.2 | Implementation properties | Y | |
| 18.2.1 | Numeric Limits | ||
| 18.2.1.1 | Class template numeric_limits | Y | |
| 18.2.1.2 | numeric_limits members | Y | |
| 18.2.1.3 | float_round_style | Y | |
| 18.2.1.4 | float_denorm_style | Y | |
| 18.2.1.5 | numeric_limits specializations | Y | |
| 18.2.2 | C Library | Y | |
| 18.3 | Start and termination | Y | |
| 18.4 | Dynamic memory management | Y | |
| 18.5 | Type identification | ||
| 18.5.1 | Class type_info | Y | |
| 18.5.2 | Class bad_cast | Y | |
| 18.5.3 | Class bad_typeid | Y | |
| 18.6 | Exception handling | ||
| 18.6.1 | Class exception | Y | |
| 18.6.2 | Violation exception-specifications | Y | |
| 18.6.3 | Abnormal termination | Y | |
| 18.6.4 | uncaught_exception | Y | |
| 18.7 | Other runtime support | Y | |
| 19 | Diagnostics | ||
| 19.1 | Exception classes | Y | |
| 19.2 | Assertions | Y | |
| 19.3 | Error numbers | Y | |
| 20 | General utilities | ||
| 20.1 | Requirements | Y | |
| 20.2 | Utility components | ||
| 20.2.1 | Operators | Y | |
| 20.2.2 | pair | Y | |
| 20.3 | Function objects | ||
| 20.3.1 | Base | Y | |
| 20.3.2 | Arithmetic operation | Y | |
| 20.3.3 | Comparisons | Y | |
| 20.3.4 | Logical operations | Y | |
| 20.3.5 | Negators | Y | |
| 20.3.6 | Binders | Y | |
| 20.3.7 | Adaptors for pointers to functions | Y | |
| 20.3.8 | Adaptors for pointers to members | Y | |
| 20.4 | Memory | ||
| 20.4.1 | The default allocator | Y | |
| 20.4.2 | Raw storage iterator | Y | |
| 20.4.3 | Temporary buffers | Y | |
| 20.4.4 | Specialized algorithms | Y | |
| 20.4.4.1 | uninitialized_copy | Y | |
| 20.4.4.2 | uninitialized_fill | Y | |
| 20.4.4.3 | uninitialized_fill_n | Y | |
| 20.4.5 | Class template auto_ptr | Y | |
| 20.4.6 | C library | Y | |
| 21 | Strings | ||
| 21.1 | Character traits | ||
| 21.1.1 | Character traits requirements | Y | |
| 21.1.2 | traits typedef | Y | |
| 21.1.3 | char_traits specializations | ||
| 21.1.3.1 | struct char_traits<char> | Y | |
| 21.1.3.2 | struct char_traits<wchar_t> | Y | |
| 21.2 | String classes | Y | |
| 21.3 | Class template basic_string | Y | |
| 21.4 | Null-terminated sequence utilities | Y | C library dependency |
| 22 | Localization | ||
| 22.1 | Locales | ||
| 22.1.1 | Class locale | Y | |
| 22.1.2 | locale globals | Y | |
| 22.1.3 | Convenience interfaces | ||
| 22.1.3.1 | Character classification | Y | |
| 22.1.3.2 | Character conversions | Y | |
| 22.2 | Standard locale categories | ||
| 22.2.1 | ctype | Y | |
| 22.2.2 | Numeric | ||
| 22.2.2.1 | num_get | Y | |
| 22.2.2.2 | num_put | Y | |
| 22.2.3 | num_punct | Y | |
| 22.2.4 | collate | Y | |
| 22.2.5 | Time | ||
| 22.2.5.1 | time_get | Y | |
| 22.2.5.2 | time_get_byname | Y | |
| 22.2.5.3 | time_put | Y | |
| 22.2.5.3 | time_put_byname | Y | |
| 22.2.6 | Monetary | ||
| 22.2.6.1 | money_get | Y | |
| 22.2.6.2 | money_put | Y | |
| 22.2.6.3 | money_punct | Y | |
| 22.2.6.4 | money_punct_byname | Y | |
| 22.2.7 | messages | Y | |
| 22.2.8 | Program-defined facets | Y | |
| 22.3 | C Library Locales | Y | |
| 23 | Containers | ||
| 23.1 | Container requirements | Y | |
| 23.2 | Sequence containers | ||
| 23.2.1 | Class template deque | Y | |
| 23.2.2 | Class template list | Y | |
| 23.2.3 | Adaptors | ||
| 23.2.3.1 | Class template queue | Y | |
| 23.2.3.2 | Class template priority_queue | Y | |
| 23.2.3.3 | Class template stack | Y | |
| 23.2.4 | Class template vector | Y | |
| 23.2.5 | Class vector<bool> | Y | |
| 23.3 | Associative containers | ||
| 23.3.1 | Class template map | Y | |
| 23.3.2 | Class template multimap | Y | |
| 23.3.3 | Class template set | Y | |
| 23.3.4 | Class template multiset | Y | |
| 24 | Iterators | ||
| 24.1 | Requirements | Y | |
| 24.2 | Header <iterator> synopsis | Y | |
| 24.3 | Iterator primitives | Y | |
| 24.4 | Predefined iterators and Iterator adaptors | ||
| 24.4.1 | Reverse iterators | Y | |
| 24.4.2 | Insert iterators | Y | |
| 24.5 | Stream iterators | ||
| 24.5.1 | Class template istream_iterator | Y | |
| 24.5.2 | Class template ostream_iterator | Y | |
| 24.5.3 | Class template istreambuf_iterator | Y | |
| 24.5.4 | Class template ostreambuf_iterator | Y | |
| 25 | Algorithms | ||
| 25.1 | Non-modifying sequence operations | Y | |
| 25.2 | Mutating sequence operations | Y | |
| 25.3 | Sorting and related operations | Y | |
| 25.4 | C library algorithms | Y | |
| 26 | Numerics | ||
| 26.1 | Numeric type requirements | Y | |
| 26.2 | Complex numbers | Y | |
| 26.3 | Numeric arrays | ||
| 26.3.1 | Header <valarray> synopsis | Y | |
| 26.3.2 | Class template valarray | Y | |
| 26.3.3 | valarray non-member operations | Y | |
| 26.3.4 | Class slice | Y | |
| 26.3.5 | Class template slice_array | Y | |
| 26.3.6 | Class gslice | Y | |
| 26.3.7 | Class template gslice_array | Y | |
| 26.3.8 | Class template mask_array | Y | |
| 26.3.9 | Class template indirect_array | Y | |
| 26.4 | Generalized numeric operations | ||
| 26.4.1 | accumulate | Y | |
| 26.4.2 | inner_product | Y | |
| 26.4.3 | partial_sum | Y | |
| 26.4.4 | adjacent_difference | Y | |
| 26.4.5 | iota | Y | |
| 26.5 | C Library | Y | |
| 27 | Input/output | ||
| 27.1 | Requirements | Y | |
| 27.2 | Forward declarations | Y | |
| 27.3 | Standard iostream objects | Y | |
| 27.3.1 | Narrow stream objects | Y | |
| 27.3.2 | Wide stream objects | Y | |
| 27.4 | Iostreams base classes | Y | |
| 27.5 | Stream buffers | Y | |
| 27.6 | Formatting and manipulators | Y | |
| 27.7 | String-based streams | Y | |
| 27.8 | File-based streams | Y | |
| Appendix D | Compatibility features | ||
| D.1 | Increment operator with bool operand | ||
| D.2 | static keyword | ||
| D.3 | Access declarations | ||
| D.4 | Implicit conversion from const strings | ||
| D.5 | C standard library headers | ||
| D.6 | Old iostreams members | ||
| D.7 | char* streams | ||
The ISO standard defines the following phrase:
[1.3.5] implementation-defined behaviorBehavior, for a well-formed program construct and correct data, that depends on the implementation and that each implementation shall document.
We do so here, for the C++ library only. Behavior of the compiler, linker, runtime loader, and other elements of "the implementation" are documented elsewhere. Everything listed in Annex B, Implementation Qualities, are also part of the compiler, not the library.
For each entry, we give the section number of the standard, when applicable. This list is probably incomplet and inkorrekt.
[1.9]/11 #3 If isatty(3) is true, then
interactive stream support is implied.
[17.4.4.5] Non-reentrant functions are probably best discussed in the various sections on multithreading (see above).
[18.1]/4 The type of NULL is described
under Support.
[18.3]/8 Even though it's listed in the library sections, libstdc++ has zero control over what the cleanup code hands back to the runtime loader. Talk to the compiler people. :-)
[18.4.2.1]/5 (bad_alloc),
[18.5.2]/5 (bad_cast),
[18.5.3]/5 (bad_typeid),
[18.6.1]/8 (exception),
[18.6.2.1]/5 (bad_exception): The what()
member function of class std::exception, and these other
classes publicly derived from it, returns the name of the
class, e.g. "std::bad_alloc".
[18.5.1]/7 The return value of
std::type_info::name() is the mangled type name.
You will need to call c++filt and pass the names as
command-line parameters to demangle them, or call a
runtime demangler function.
[20.1.5]/5 "Implementors are encouraged to supply libraries that can accept allocators that encapsulate more general memory models and that support non-equal instances. In such implementations, any requirements imposed on allocators by containers beyond those requirements that appear in Table 32, and the semantics of containers and algorithms when allocator instances compare non-equal, are implementation-defined." There is experimental support for non-equal allocators in the standard containers in C++98 mode. There are no additional requirements on allocators. It is undefined behaviour to swap two containers if their allocators are not equal.
[21.1.3.1]/3,4, [21.1.3.2]/2, [21.3]/6 basic_string::iterator, basic_string::const_iterator, [23.*]'s foo::iterator, [27.*]'s foo::*_type, others... Nope, these types are called implementation-defined because you shouldn't be taking advantage of their underlying types. Listing them here would defeat the purpose. :-)
[21.1.3.1]/5 I don't really know about
the mbstate_t stuff... see
the codecvt
notes for what does exist.
[22.*] Anything and everything we have on locale implementation will be described under Localization.
[23.*] All of the containers in this clause define size_type as std::size_t and difference_type as std::ptrdiff_t.
[26.2.8]/9 I have no idea what
complex<T>'s pow(0,0) returns.
[27.4.2.4]/2 Calling
std::ios_base::sync_with_stdio after I/O has already been
performed on the standard stream objects will
flush the buffers, and
destroy and recreate the underlying buffer instances. Whether or not
the previously-written I/O is destroyed in this process depends mostly
on the --enable-libio choice: for stdio, if the written
data is already in the stdio buffer, the data may be completely safe!
[27.6.1.1.2], [27.6.2.3] The I/O sentry ctor and dtor can perform additional work than the minimum required. We are not currently taking advantage of this yet.
[27.7.1.3]/16,
[27.8.1.4]/10
The effects of pubsetbuf/setbuf are described in the
Input and Output chapter.
[27.8.1.4]/16 Calling fstream::sync when
a get area exists will... whatever fflush() does, I think.
This table is based on the table of contents of ISO/IEC JTC1 SC22 WG21 Doc No: N3290 Date: 2011-04-11 Final Draft International Standard, Standard for Programming Language C++
In this implementation the -std=gnu++11 or
-std=c++11 flag must be used to enable language
and library
features. See dialect
options. The pre-defined symbol
__cplusplus is used to check for the
presence of the required flag.
This page describes the C++11 support in the GCC 9 series.
Table 1.2. C++ 2011 Implementation Status
| Section | Description | Status | Comments | |
|---|---|---|---|---|
| 18 | Language support | |||
| 18.1 | General | Y | ||
| 18.2 | Types | Y | ||
| 18.3 | Implementation properties | |||
| 18.3.2 | Numeric Limits | |||
| 18.3.2.3 | Class template numeric_limits | Y | ||
| 18.3.2.4 | numeric_limits members | Y | ||
| 18.3.2.5 | float_round_style | N | ||
| 18.3.2.6 | float_denorm_style | N | ||
| 18.3.2.7 | numeric_limits specializations | Y | ||
| 18.3.3 | C Library | Y | ||
| 18.4 | Integer types | |||
| 18.4.1 | Header <cstdint> synopsis | Y | ||
| 18.5 | Start and termination | Partial | C library dependency for quick_exit, at_quick_exit | |
| 18.6 | Dynamic memory management | Y | ||
| 18.7 | Type identification | |||
| 18.7.1 | Class type_info | Y | ||
| 18.7.2 | Class bad_cast | Y | ||
| 18.7.3 | Class bad_typeid | Y | ||
| 18.8 | Exception handling | |||
| 18.8.1 | Class exception | Y | ||
| 18.8.2 | Class bad_exception | Y | ||
| 18.8.3 | Abnormal termination | Y | ||
| 18.8.4 | uncaught_exception | Y | ||
| 18.8.5 | Exception Propagation | Y | ||
| 18.8.6 | nested_exception | Y | ||
| 18.9 | Initializer lists | |||
| 18.9.1 | Initializer list constructors | Y | ||
| 18.9.2 | Initializer list access | Y | ||
| 18.9.3 | Initializer list range access | Y | ||
| 18.10 | Other runtime support | Y | ||
| 19 | Diagnostics | |||
| 19.1 | General | Y | ||
| 19.2 | Exception classes | Y | ||
| 19.3 | Assertions | Y | ||
| 19.4 | Error numbers | Y | ||
| 19.5 | System error support | |||
| 19.5.1 | Class error_category | Y | ||
| 19.5.2 | Class error_code | Y | ||
| 19.5.3 | Class error_condition | Y | ||
| 19.5.4 | Comparison operators | Y | ||
| 19.5.5 | Class system_error | Y | ||
| 20 | General utilities | |||
| 20.1 | General | |||
| 20.2 | Utility components | |||
| 20.2.1 | Operators | Y | ||
| 20.2.2 | Swap | Y | ||
| 20.2.3 | forward and move helpers | Y | ||
| 20.2.4 | Function template declval | Y | ||
| 20.3 | Pairs | |||
| 20.3.1 | In general | |||
| 20.3.2 | Class template pair | Y | ||
| 20.3.3 | Specialized algorithms | Y | ||
| 20.3.4 | Tuple-like access to pair | Y | ||
| 20.3.5 | Piecewise construction | Y | ||
| 20.4 | Tuples | |||
| 20.4.1 | In general | |||
| 20.4.2 | Class template tuple | |||
| 20.4.2.1 | Construction | Y | ||
| 20.4.2.2 | Assignment | Y | ||
| 20.4.2.3 | Swap | Y | ||
| 20.4.2.4 | Tuple creation functions | Y | ||
| 20.4.2.5 | Tuple helper classes | Y | ||
| 20.4.2.6 | Element access | Y | ||
| 20.4.2.7 | Relational operators | Y | ||
| 20.4.2.8 | Tuple traits | Y | ||
| 20.4.2.9 | Tuple specialized algorithms | Y | ||
| 20.5 | Class template bitset | Y | ||
| 20.5.1 | bitset constructors | Y | ||
| 20.5.2 | bitset members | Y | ||
| 20.5.3 | bitset hash support | Y | ||
| 20.5.4 | bitset operators | Y | ||
| 20.6 | Memory | |||
| 20.6.1 | In general | |||
| 20.6.2 | Header <memory> synopsis | |||
| 20.6.3 | Pointer traits | Y | ||
| 20.6.4 | Pointer safety | Y | ||
| 20.6.5 | Align | Y | ||
| 20.6.6 | Allocator argument tag | Y | ||
| 20.6.7 | uses_allocator | Y | ||
| 20.6.8 | Allocator traits | Y | ||
| 20.6.9 | The default allocator | Y | ||
| 20.6.10 | Raw storage iterator | Y | ||
| 20.6.11 | Temporary buffers | Y | ||
| 20.6.12 | Specialized algorithms | |||
| 20.6.12.1 | addressof | Y | ||
| 20.6.12.2 | uninitialized_copy | Y | ||
| 20.6.12.3 | uninitialized_fill | Y | ||
| 20.6.12.4 | uninitialized_fill_n | Y | ||
| 20.6.13 | C library | Y | ||
| 20.7 | Smart pointers | |||
| 20.7.1 | Class template unique_ptr | Y | ||
| 20.7.2 | Shared-ownership pointers | Y | ||
| 20.7.2.1 | Class bad_weak_ptr | Y | ||
| 20.7.2.2 | Class template shared_ptr | Y | Uses code from boost::shared_ptr. | |
| 20.7.2.3 | Class template weak_ptr | Y | ||
| 20.7.2.4 | Class template emable_shared_from_this | Y | ||
| 20.7.2.5 | shared_ptr atomic access | Y | ||
| 20.7.2.6 | Smart pointer hash support | Y | ||
| 20.8 | Function objects | |||
| 20.8.1 | Definitions | |||
| 20.8.2 | Requirements | |||
| 20.8.3 | Class template reference_wrapper | Y | ||
| 20.8.4 | Arithmetic operation | Y | ||
| 20.8.5 | Comparisons | Y | ||
| 20.8.6 | Logical operations | Y | ||
| 20.8.7 | Bitwise operations | Y | ||
| 20.8.8 | Negators | Y | ||
| 20.8.9 | Function template bind | Y | ||
| 20.8.10 | Function template mem_fn | Y | ||
| 20.8.11 | Polymorphic function wrappers | |||
| 20.8.11.1 | Class bad_function_call | Y | ||
| 20.8.11.2 | Class template function | Partial | Missing allocator support | |
| 20.8.12 | Class template hash | Y | ||
| 20.9 | Metaprogramming and type traits | |||
| 20.9.1 | Requirements | Y | ||
| 20.9.2 | Header <type_traits> synopsis | |||
| 20.9.3 | Helper classes | Y | ||
| 20.9.4 | Unary Type Traits | Y | ||
| 20.9.4.1 | Primary type categories | Y | ||
| 20.9.4.2 | Composite type traits | Y | ||
| 20.9.4.3 | Type properties | Y | ||
| 20.9.5 | Type property queries | Y | ||
| 20.9.6 | Relationships between types | Y | ||
| 20.9.7 | Transformations between types | |||
| 20.9.7.1 | Const-volatile modifications | Y | ||
| 20.9.7.2 | Reference modifications | Y | ||
| 20.9.7.3 | Sign modifications | Y | ||
| 20.9.7.4 | Array modifications | Y | ||
| 20.9.7.5 | Pointer modifications | Y | ||
| 20.9.7.6 | Other transformations | Y | ||
| 20.10 | Compile-time rational arithmetic | |||
| 20.10.1 | In general | |||
| 20.10.2 | Header <ratio> synopsis | |||
| 20.10.3 | Class template ratio | Y | ||
| 20.10.4 | Arithmetic on ratios | Y | ||
| 20.10.5 | Comparison of ratios | Y | ||
| 20.10.6 | SI types for ratio | Y | ||
| 20.11 | Time utilities | |||
| 20.11.3 | Clock requirements | Y | ||
| 20.11.4 | Time-related traits | |||
| 20.11.4.1 | treat_as_floating_point | Y | ||
| 20.11.4.2 | duration_values | Y | ||
| 20.11.4.3 | Specializations of common_type | Y | ||
| 20.11.5 | Class template duration | Y | ||
| 20.11.6 | Class template time_point | Y | ||
| 20.11.7 | Clocks | |||
| 20.11.7.1 | Class system_clock | Y | ||
| 20.11.7.2 | Class steady_clock | Y | ||
| 20.11.7.3 | Class high_resolution_clock | Y | ||
| 20.11.8 | Date and time functions | Y | ||
| 20.12 | Scoped allocator adaptor | Y | ||
| 20.12.1 | Header <scoped_allocator> synopsis | |||
| 20.12.2 | Scoped allocator adaptor member types | Y | ||
| 20.12.3 | Scoped allocator adaptor constructors | Y | ||
| 20.12.4 | Scoped allocator adaptor members | Y | ||
| 20.12.5 | Scoped allocator operators | Y | ||
| 20.13 | Class type_index | Y | ||
| 21 | Strings | |||
| 21.1 | General | Y | ||
| 21.2 | Character traits | |||
| 21.2.1 | Character traits requirements | Y | ||
| 21.2.2 | traits typedefs | Y | ||
| 21.2.3 | char_traits specializations | |||
| 21.2.3.1 | struct char_traits<char> | Y | ||
| 21.2.3.2 | struct char_traits<char16_t> | Y | ||
| 21.2.3.3 | struct char_traits<char32_t> | Y | ||
| 21.2.3.4 | struct char_traits<wchar_t> | Y | ||
| 21.3 | String classes | Y | ||
| 21.4 | Class template basic_string | Y | ||
| 21.5 | Numeric Conversions | Y | ||
| 21.6 | Hash support | Y | ||
| 21.7 | Null-terminated sequence utilities | Partial | C library dependency.
Missing <cuchar>
| |
| 22 | Localization | |||
| 22.1 | General | Y | ||
| 22.2 | Header <locale> synopsis | Y | ||
| 22.3 | Locales | |||
| 22.3.1 | Class locale | Y | ||
| 22.3.2 | locale globals | Y | ||
| 22.3.3 | Convenience interfaces | |||
| 22.3.3.1 | Character classification | Y | ||
| 22.3.3.2 | Conversions | |||
| 22.3.3.2.1 | Character conversions | Y | ||
| 22.3.3.2.2 | string conversions | Y | ||
| 22.3.3.2.3 | Buffer conversions | Y | ||
| 22.4 | Standard locale categories | |||
| 22.4.1 | The ctype category | Y | ||
| 22.4.2 | The numeric category | |||
| 22.4.2.1 | num_get | Y | ||
| 22.4.2.2 | num_put | Y | ||
| 22.4.3 | The numeric punctuation facet | Y | ||
| 22.4.4 | The collate category | Y | ||
| 22.4.5 | The time category | |||
| 22.4.5.1 | Class template time_get | Y | ||
| 22.4.5.2 | Class template time_get_byname | Y | ||
| 22.4.5.3 | Class template time_put | Y | ||
| 22.4.5.3 | Class template time_put_byname | Y | ||
| 22.4.6 | The monetary category | |||
| 22.4.6.1 | Class template money_get | Y | ||
| 22.4.6.2 | Class template money_put | Y | ||
| 22.4.6.3 | Class template money_punct | Y | ||
| 22.4.6.4 | Class template money_punct_byname | Y | ||
| 22.4.7 | The message retrieval category | Y | ||
| 22.4.8 | Program-defined facets | Y | ||
| 22.5 | Standard code conversion facets | Y | ||
| 22.6 | C Library Locales | Y | ||
| 23 | Containers | |||
| 23.1 | General | |||
| 23.2 | Container requirements | |||
| 23.2.1 | General container requirements | Y | ||
| 23.2.2 | Container data races | Y | ||
| 23.2.3 | Sequence containers | Y | ||
| 23.2.4 | Associative containers | Y | ||
| 23.2.5 | Unordered associative containers | Y | ||
| 23.3 | Sequence containers | |||
| 23.3.2 | Class template array | Y | ||
| 23.3.3 | Class template deque | Y | ||
| 23.3.4 | Class template forward_list | Y | ||
| 23.3.5 | Class template list | Y | ||
| 23.3.6 | Class template vector | Y | ||
| 23.3.7 | Class vector<bool> | Y | ||
| 23.4 | Associative containers | |||
| 23.4.4 | Class template map | Y | ||
| 23.4.5 | Class template multimap | Y | ||
| 23.4.6 | Class template set | Y | ||
| 23.4.7 | Class template multiset | Y | ||
| 23.5 | Unordered associative containers | |||
| 23.5.4 | Class template unordered_map | Y | ||
| 23.5.5 | Class template unordered_multimap | Y | ||
| 23.5.6 | Class template unordered_set | Y | ||
| 23.5.7 | Class template unordered_multiset | Y | ||
| 23.6 | Container adaptors | |||
| 23.6.1 | Class template queue | Y | ||
| 23.6.2 | Class template priority_queue | Y | ||
| 23.6.3 | Class template stack | Y | ||
| 24 | Iterators | |||
| 24.1 | General | Y | ||
| 24.2 | Iterator requirements | Y | ||
| 24.3 | Header <iterator> synopsis | Y | ||
| 24.4 | Iterator primitives | Y | ||
| 24.5 | Iterator adaptors | |||
| 24.5.1 | Reverse iterators | Y | ||
| 24.5.2 | Insert iterators | Y | ||
| 24.5.3 | Move iterators | Y | ||
| 24.6 | Stream iterators | |||
| 24.6.1 | Class template istream_iterator | Y | ||
| 24.6.2 | Class template ostream_iterator | Y | ||
| 24.6.3 | Class template istreambuf_iterator | Y | ||
| 24.6.4 | Class template ostreambuf_iterator | Y | ||
| 24.6.5 | range access | Y | ||
| 25 | Algorithms | |||
| 25.1 | General | |||
| 25.2 | Non-modifying sequence operations | Y | ||
| 25.3 | Mutating sequence operations | Y | ||
| 25.4 | Sorting and related operations | Y | ||
| 25.5 | C library algorithms | Y | ||
| 26 | Numerics | |||
| 26.1 | General | Y | ||
| 26.2 | Numeric type requirements | Y | ||
| 26.3 | The floating-point environment | Y | ||
| 26.4 | Complex numbers | Y | ||
| 26.5 | Random number generation | |||
| 26.5.1 | Requirements | |||
| 26.5.2 | Header <random> synopsis | |||
| 26.5.3 | Random number engine class templates | |||
| 26.5.3.1 | Class template linear_congruential_engine | Y | ||
| 26.5.3.2 | Class template mersenne_twister_engine | Y | ||
| 26.5.3.3 | Class template subtract_with_carry_engine | Y | ||
| 26.5.4 | Random number engine adaptor class templates | |||
| 26.5.4.2 | Class template discard_block_engine | Y | ||
| 26.5.4.3 | Class template independent_bits_engine | Y | ||
| 26.5.4.4 | Class template shuffle_order_engine | Y | ||
| 26.5.5 | Engines and engine adaptors with predefined parameters | Y | ||
| 26.5.6 | Class random_device | Y | ||
| 26.5.7 | Utilities | |||
| 26.5.7.1 | Class seed_seq | Y | ||
| 26.5.7.2 | Function template generate_canonical | Y | ||
| 26.5.8 | Random number distribution class templates | |||
| 26.5.8.2 | Uniform distributions | |||
| 26.5.8.2.1 | Class template uniform_int_distribution | Y | ||
| 26.5.8.2.2 | Class template uniform_real_distribution | Y | ||
| 26.5.8.3 | Bernoulli distributions | |||
| 26.5.8.3.1 | Class bernoulli_distribution | Y | ||
| 26.5.8.3.2 | Class template binomial_distribution | Y | ||
| 26.5.8.3.3 | Class template geometric_distribution | Y | ||
| 26.5.8.3.4 | Class template negative_binomial_distribution | Y | ||
| 26.5.8.4 | Poisson distributions | |||
| 26.5.8.4.1 | Class template poisson_distribution | Y | ||
| 26.5.8.4.2 | Class template exponential_distribution | Y | ||
| 26.5.8.4.3 | Class template gamma_distribution | Y | ||
| 26.5.8.4.4 | Class template weibull_distribution | Y | ||
| 26.5.8.4.5 | Class template extreme_value_distribution | Y | ||
| 26.5.8.5 | Normal distributions | |||
| 26.5.8.5.1 | Class template normal_distribution | Y | ||
| 26.5.8.5.2 | Class template lognormal_distribution | Y | ||
| 26.5.8.5.3 | Class template chi_squared_distribution | Y | ||
| 26.5.8.5.4 | Class template cauchy_distribution | Y | ||
| 26.5.8.5.5 | Class template fisher_f_distribution | Y | ||
| 26.5.8.5.6 | Class template student_t_distribution | Y | ||
| 26.5.8.6 | Sampling distributions | |||
| 26.5.8.6.1 | Class template discrete_distribution | Y | ||
| 26.5.8.6.2 | Class template piecewise_constant_distribution | Y | ||
| 26.5.8.6.3 | Class template piecewise_linear_distribution | Y | ||
| 26.6 | Numeric arrays | |||
| 26.6.1 | Header <valarray> synopsis | Y | ||
| 26.6.2 | Class template valarray | Y | ||
| 26.6.3 | valarray non-member operations | Y | ||
| 26.6.4 | Class slice | Y | ||
| 26.6.5 | Class template slice_array | Y | ||
| 26.6.6 | The gslice class | Y | ||
| 26.6.7 | Class template gslice_array | Y | ||
| 26.6.8 | Class template mask_array | Y | ||
| 26.6.9 | Class template indirect_array | Y | ||
| 26.6.10 | valarray range access | Y | ||
| 26.7 | Generalized numeric operations | |||
| 26.7.1 | Header <numeric> synopsis | Y | ||
| 26.7.2 | accumulate | Y | ||
| 26.7.3 | inner_product | Y | ||
| 26.7.4 | partial_sum | Y | ||
| 26.7.5 | adjacent_difference | Y | ||
| 26.7.6 | iota | Y | ||
| 26.8 | C Library | Y | ||
| 27 | Input/output library | |||
| 27.1 | General | Y | ||
| 27.2 | Iostreams requirements | Y | ||
| 27.2.1 | Imbue Limitations | Y | ||
| 27.2.2 | Positioning Type Limitations | Y | ||
| 27.2.3 | Thread safety | Partial | ||
| 27.3 | Forward declarations | Y | ||
| 27.4 | Standard iostream objects | Y | ||
| 27.4.1 | Overview | Y | ||
| 27.4.2 | Narrow stream objects | Y | ||
| 27.4.3 | Wide stream objects | Y | ||
| 27.5 | Iostreams base classes | Y | ||
| 27.6 | Stream buffers | Y | ||
| 27.7 | Formatting and manipulators | Y | ||
| 27.8 | String-based streams | Y | ||
| 27.9 | File-based streams | Y | ||
| 28 | Regular expressions | |||
| 28.1 | General | Y | ||
| 28.2 | Definitions | Y | ||
| 28.3 | Requirements | Y | ||
| 28.4 | Header <regex> synopsis | Y | ||
| 28.5 | Namespace std::regex_constants | Y | ||
| 28.6 | Class regex_error | Y | ||
| 28.7 | Class template regex_traits | Partial | transform_primary is not correctly implemented | |
| 28.8 | Class template basic_regex | Y | ||
| 28.9 | Class template sub_match | Y | ||
| 28.10 | Class template match_results | Y | ||
| 28.11 | Regular expression algorithms | Y | ||
| 28.12 | Regular expression Iterators | Y | ||
| 28.13 | Modified ECMAScript regular expression grammar | Y | ||
| 29 | Atomic operations | |||
| 29.1 | General | Y | ||
| 29.2 | Header <atomic> synopsis | Y | ||
| 29.3 | Order and consistency | Partial | ||
| 29.4 | Lock-free property | Y | ||
| 29.5 | Atomic types | Y | ||
| 29.6 | Operations on atomic types | Y | ||
| 29.7 | Flag Type and operations | Y | ||
| 29.8 | Fences | Y | ||
| 30 | Thread support | |||
| 30.1 | General | Y | ||
| 30.2 | Requirements | Y | ||
| 30.3 | Threads | |||
| 30.3.1 | Class thread | Partial | thread::id comparisons not well-defined | |
| 30.3.2 | Namespace this_thread | Y | ||
| 30.4 | Mutual exclusion | |||
| 30.4.1 | Mutex requirements | |||
| 30.4.1.1 | In general | |||
| 30.4.1.2 | Mutex types | |||
| 30.4.1.2.1 | Class mutex | Y | ||
| 30.4.1.2.2 | Class recursive_mutex | Y | ||
| 30.4.1.3 | Timed mutex types | |||
| 30.4.1.3.1 | Class timed_mutex | Y | ||
| 30.4.1.3.2 | Class recursive_timed_mutex | Y | ||
| 30.4.2 | Locks | |||
| 30.4.2.1 | Class template lock_guard | Y | ||
| 30.4.2.2 | Class template unique_lock | Y | ||
| 30.4.3 | Generic locking algorithms | Y | ||
| 30.4.4 | Call once | |||
| 30.4.4.1 | Struct once_flag | Y | ||
| 30.4.4.2 | Function call_once | Y | ||
| 30.5 | Condition variables | Y | ||
| 30.5.1 | Class condition_variable | Y | ||
| 30.5.2 | Class condition_variable_any | Y | ||
| 30.6 | Futures | |||
| 30.6.1 | Overview | |||
| 30.6.2 | Error handling | Y | ||
| 30.6.3 | Class future_error | Y | ||
| 30.6.4 | Shared state | Y | ||
| 30.6.5 | Class template promise | Y | ||
| 30.6.6 | Class template future | Y | ||
| 30.6.7 | Class template shared_future | Y | ||
| 30.6.8 | Function template async | Y | ||
| 30.6.9 | Class template packaged_task | Y | ||
| Appendix D | Compatibility features | |||
| D.1 | Increment operator with bool operand | |||
| D.2 | register keyword | |||
| D.3 | Implicit declaration of copy functions | |||
| D.4 | Dynamic exception specifications | |||
| D.5 | C standard library headers | |||
| D.6 | Old iostreams members | |||
| D.7 | char* streams | |||
| D.8 | Function objects | |||
| D.9 | Binders | |||
| D.10 | auto_ptr | |||
| D.11 | Violating exception-specifications | |||
For behaviour which is also specified by the 1998 and 2003 standards, see C++ 1998/2003 Implementation Specific Behavior. This section only documents behaviour which is new in the 2011 standard.
17.6.5.12 [res.on.exception.handling] There are no implementation-defined exception classes, only standard exception classes (or classes derived from them) will be thrown.
17.6.5.14 [value.error.codes]
The error_category for errors originating outside
the OS, and the possible error code values for each error category,
should be documented here.
18.6.2.2 [new.badlength]
what() returns
"std::bad_array_new_length".
20.6.9.1 [allocator.member]/5
Over-aligned types are not supported by
std::allocator.
20.7.2.2.1 [util.smartptr.shared.const]
When a shared_ptr constructor fails
bad_alloc (or types derived from it) will
be thrown, or when an allocator is passed to the constructor then any
exceptions thrown by the allocator.
20.7.2.0 [util.smartptr.weakptr]
what() returns "bad_weak_ptr".
20.8.9.1.3 [func.bind.place]/1 There are 29
placeholders defined and the placeholder types are
CopyAssignable.
20.11.7.1 [time.clock.system]/3, /4
Time point values are truncated to time_t values.
There is no loss of precision for conversions in the other direction.
20.15.7 [meta.trans]/2
aligned_storage does not support extended
alignment.
21.2.3.2 [char.traits.specializations.char16_t],
21.2.3.3 [char.traits.specializations.char32_t]
The types u16streampos and
u32streampos are both synonyms for
fpos<mbstate_t>.
The function eof returns int_type(-1).
char_traits<char16_t>::to_int_type will
transform the "noncharacter" U+FFFF to U+FFFD (REPLACEMENT CHARACTER).
This is done to ensure that to_int_type never
returns the same value as eof, which is U+FFFF.
22.3.1 [locale] There is one global locale for the whole program, not per-thread.
22.4.5.1.2 [locale.time.get.virtuals], 22.4.5.3.2 [locale.time.put.virtuals] Additional supported formats should be documented here.
22.4.7.1.2 [locale.messages.virtuals] The mapping should be documented here.
23.3.2.1 [array.overview]
array<T, N>::iterator is T* and
array<T, N>::const_iterator is
const T*.
23.5.4.2 [unord.map.cnstr], 23.5.5.2 [unord.multimap.cnstr], 23.5.6.2 [unord.set.cnstr], 23.5.7.2 [unord.multiset.cnstr] The default minimal bucket count is 0 for the default constructors, range constructors and initializer-list constructors.
25.3.12 [alg.random.shuffle]
The two-argument overload of random_shuffle
uses rand as the source of randomness.
26.5.5 [rand.predef]
The type default_random_engine is a synonym for
minstd_rand0.
26.5.6 [rand.device]
The default token argument to the
random_device constructor is
"default". Other valid arguments are
"/dev/random" and "/dev/urandom",
which determine the character special file to read random bytes from.
The "default" token will read bytes from a hardware
RNG if available (currently this only supports the IA-32 RDRAND
instruction) otherwise it is equivalent to
"/dev/urandom".
An exception of type runtime_error will be
thrown if a random_device object cannot open
or read from the source of random bytes.
26.5.8.1 [rand.dist.general] The algorithms used by the distributions should be documented here.
26.8 [c.math] Whether the
rand function introduces data races depends on
the C library as the function is not provided by libstdc++.
27.8.2.1 [stringbuf.cons]
Whether the sequence pointers are copied by the
basic_stringbuf move constructor should be
documented here.
27.9.1.2 [filebuf.cons]
Whether the sequence pointers are copied by the
basic_filebuf move constructor should be
documented here.
28.5.1 [re.synopt],
28.5.2 [re.matchflag] ,
28.5.3 [re.err]
syntax_option_type, match_flag_type
and error_type are unscoped enumeration types.
28.7 [re.traits]
The blank character class corresponds to the
ctype_base::blank mask.
29.4 [atomics.lockfree]
The values of the ATOMIC_xxx_LOCK_FREE macros depend on
the target and cannot be listed here.
30.2.3 [thread.req.native]/1
native_handle_type and
native_handle are provided. The handle types
are defined in terms of the Gthreads abstraction layer, although this
is subject to change at any time. Any use of
native_handle is inherently non-portable and
not guaranteed to work between major releases of GCC.
thread: The native handle type is
a typedef for __gthread_t i.e. pthread_t
when GCC is configured with the posix thread
model. The value of the native handle is undefined for a thread
which is not joinable.
mutex and
timed_mutex:
The native handle type is __gthread_mutex_t* i.e.
pthread_mutex_t* for the posix
thread model.
recursive_mutex and
recursive_timed_mutex:
The native handle type is __gthread_recursive_mutex_t*
i.e. pthread_mutex_t* for the posix
thread model.
condition_variable: The native
handle type is __gthread_cond_t* i.e.
pthread_cond_t* for the posix
thread model.
30.6.1 [futures.overview]/2
launch is a scoped enumeration type with
overloaded operators to support bitmask operations. There are no
additional bitmask elements defined.
In this implementation the -std=gnu++14 or
-std=c++14 flag must be used to enable language
and library
features. See dialect
options. The pre-defined symbol
__cplusplus is used to check for the
presence of the required flag.
This page describes the C++14 and library TS support in the GCC 9 series.
Table 1.3. C++ 2014 Implementation Status
| Paper | Title | Status | Comments |
|---|---|---|---|
| N3669 | Fixing constexpr member functions without const | Y | |
| N3668 | exchange() utility function | Y | |
| N3670 | Wording for Addressing Tuples by Type | Y | |
| N3656 | make_unique | Y | |
| N3462 | std::result_of and SFINAE | Y | |
| N3545 | An Incremental Improvement to integral_constant | Y | |
| N3642 | User-defined Literals for Standard Library Types | Y | |
| N3671 | Making non-modifying sequence operations more robust | Y | |
| N3654 | Quoted Strings Library Proposal | Y | |
| N3469 | Constexpr Library Additions: chrono | Y | |
| N3470 | Constexpr Library Additions: containers | Y | |
| N3471 | Constexpr Library Additions: utilities | Y | |
| N3658 | Compile-time integer sequences | Y | |
| N3659 | Shared Locking in C++ | Y | |
| N3421 | Making Operator Functors greater<> | Y | |
| N3657 | Adding heterogeneous comparison lookup to associative containers | Y | |
| N3655 | TransformationTraits Redux | Y | |
| N3644 | Null Forward Iterators | Partial | Only affects Debug Mode |
Table 1.4. C++ Technical Specifications Implementation Status
| Paper | Title | Status | Comments |
|---|---|---|---|
| N3662 | C++ Dynamic Arrays | N | Array Extensions TS |
| N3793 | A proposal to add a utility class to represent optional objects | Y | Library Fundamentals TS |
| N3804 | Any library proposal | Y | Library Fundamentals TS |
| N3866 | Invocation type traits, but dropping function_call_operator. | N | Library Fundamentals TS |
| N3905 | Faster string searching (Boyer-Moore et al.) | Y | Library Fundamentals TS |
| N3915 | apply() call a function with arguments from a tuple | Y | Library Fundamentals TS |
| N3916 | Polymorphic memory resources | Partial (missing pool resource and buffer resource classes) | Library Fundamentals TS |
| N3920 | Extending shared_ptr to support arrays | Y | Library Fundamentals TS |
| N3921 | string_view: a non-owning reference to a string | Y | Library Fundamentals TS |
| N3925 | A sample proposal | Y | Library Fundamentals TS |
| N3932 | Variable Templates For Type Traits | Y | Library Fundamentals TS |
| N4100 | File System | Y |
Link with
-lstdc++fs
|
In this implementation the -std=gnu++17 or
-std=c++17 flag must be used to enable language
and library
features. See dialect
options. The pre-defined symbol
__cplusplus is used to check for the
presence of the required flag.
This section describes the C++17 and library TS support in the GCC 9 series.
The following table lists new library features that are included in the C++17 standard. The "Proposal" column provides a link to the ISO C++ committee proposal that describes the feature, while the "Status" column indicates the first version of GCC that contains an implementation of this feature (if it has been implemented). The "SD-6 Feature Test" column shows the corresponding macro or header from SD-6: Feature-testing recommendations for C++.
Table 1.5. C++ 2017 Implementation Status
| Library Feature | Proposal | Status | SD-6 Feature Test |
|---|---|---|---|
constexpr std::hardware_{constructive,destructive}_interference_size
| P0154R1 | No | __cpp_lib_hardware_interference_size >= 201603 |
| Core Issue 1776: Replacement of class objects containing reference members | P0137R1 | 7.1 | __cpp_lib_launder >= 201606 |
Wording for std::uncaught_exceptions | N4259 | 6.1 | __cpp_lib_uncaught_exceptions >= 201411 |
| C++17 should refer to C11 instead of C99 | P0063R3 | 9.1 | |
| Variant: a type-safe union for C++17 | P0088R3 | 7.1 | __has_include(<variant>),
__cpp_lib_variant >= 201603
(since 7.3, see Note 1)
|
Library Fundamentals V1 TS Components: optional | P0220R1 | 7.1 | __has_include(<optional>),
__cpp_lib_optional >= 201603
(since 7.3, see Note 1)
|
Library Fundamentals V1 TS Components: any | P0220R1 | 7.1 | __has_include(<any>),
__cpp_lib_any >= 201603
(since 7.3, see Note 1)
|
Library Fundamentals V1 TS Components: string_view | P0220R1 | 7.1 | __has_include(<string_view>),
__cpp_lib_string_view >= 201603
(since 7.3, see Note 1)
|
Library Fundamentals V1 TS Components: memory_resource | P0220R1 | 9.1 | __has_include(<memory_resource>),
__cpp_lib_memory_resource >= 201603
|
Library Fundamentals V1 TS Components: apply | P0220R1 | 7.1 | __cpp_lib_apply >= 201603 |
Library Fundamentals V1 TS Components: shared_ptr<T[]> | P0220R1 | 7.1 | __cpp_lib_shared_ptr_arrays >= 201603 |
| Library Fundamentals V1 TS Components: Searchers | P0220R1 | 7.1 | __cpp_lib_boyer_moore_searcher >= 201603 |
| Library Fundamentals V1 TS Components: Sampling | P0220R1 | 7.1 | __cpp_lib_sample >= 201603 |
Constant View: A proposal for a std::as_const helper function template | P0007R1 | 7.1 | __cpp_lib_as_const >= 201510 |
| Improving pair and tuple | N4387 | 6.1 | N/A |
make_from_tuple: apply for construction | P0209R2 | 7.1 | __cpp_lib_make_from_tuple >= 201606 |
Removing auto_ptr, random_shuffle(),
And Old <functional> Stuff
| N4190 | No (kept for backwards compatibility) | |
| Deprecating Vestigial Library Parts in C++17 | P0174R2 | No (kept for backwards compatibility) | |
Making std::owner_less more flexible | P0074R0 | 7.1 | __cpp_lib_transparent_operators >= 201510 |
std::addressof should be constexpr | LWG2296 | 7.1 | __cpp_lib_addressof_constexpr >= 201603 |
Safe conversions in unique_ptr<T[]> | N4089 | 6 | |
| LWG 2228: Missing SFINAE rule in unique_ptr templated assignment | N4366 | 6 | |
Re-enabling shared_from_this | P0033R1 | 7.1 | __cpp_lib_enable_shared_from_this >= 201603 |
A proposal to add invoke function template | N4169 | 6.1 | __cpp_lib_invoke >= 201411 |
TriviallyCopyable reference_wrapper | N4277 | 5.1 | |
Adopt not_fn from Library Fundamentals 2 for C++17 | P0005R4 | 7.1 | __cpp_lib_not_fn >= 201603 |
Fixes for not_fn | P0358R1 | 7.1 | |
| Fixing a design mistake in the searchers interface in Library Fundamentals | P0253R1 | 7.1 | |
| Extending memory management tools | P0040R3 | 7.1 | __cpp_lib_raw_memory_algorithms >= 201606L |
shared_ptr::weak_type | P0163R0 | 7.1 | __cpp_lib_shared_ptr_weak_type >= 201606 |
Transformation Trait Alias void_t | N3911 | 6.1 | __cpp_lib_void_t >= 201411 |
Wording for bool_constant, revision 1 | N4389 | 6.1 | __cpp_lib_bool_constant >= 201505 |
| Adopt Type Traits Variable Templates from Library Fundamentals TS for C++17 | P0006R0 | 7.1 | __cpp_lib_type_trait_variable_templates >= 201510 |
| Logical Operator Type Traits | P0013R1 | 6.1 | __cpp_lib_logical_traits >= 201510 |
| Adding [nothrow-]swappable traits | P0185R1 | 7 (__is_swappable available since 6.1) | __cpp_lib_is_swappable >= 201603 |
is_callable, the missing INVOKE related trait | P0077R2 | 7.1 | __cpp_lib_is_callable >= 201603 |
| has_unique_object_representations | P0258R2 | 7.1 | __cpp_lib_has_unique_object_representations >= 201606 |
Polishing <chrono> | P0092R1 | 7.1 | __cpp_lib_chrono >= 201510 |
Adding more constexpr to <chrono> | P0505R0 | 7.1 | __cpp_lib_chrono >= 201611
(since 7.3, see Note 2)
|
Constexpr for std::char_traits | P0426R1 | 8.1 | __cpp_lib_constexpr_char_traits >= 201611 |
Integrating std::string_view and std::string | P0254R2 | 7.1 | |
| Give 'std::string' a non-const '.data()' member function | P0272R1 | 7.1 | |
| Cleaning-up noexcept in the Library | N4258 | 6.1 | __cpp_lib_allocator_traits_is_always_equal >= 201411 |
| Contiguous Iterators | N4284 | N/A | |
| Minimal incomplete type support for standard containers | N4510 | 3.0 | __cpp_lib_incomplete_container_elements >= 201505
(since 6.2, see Note 2)
|
| Emplace return type | P0084R2 | 7.1 | |
| Improved insertion interface for unique-key maps | N4279 | 6.1 | __cpp_lib_map_try_emplace >= 201411,
__cpp_lib_unordered_map_try_emplace >= 201411
|
| Splicing Maps and Sets | P0083R3 | 7.1 | __cpp_lib_node_extract >= 201606 |
Non-member size() and more | N4280 | 6.1 | __cpp_lib_nonmember_container_access >= 201411 |
A Proposal to Add Constexpr Modifiers to reverse_iterator, move_iterator, array and Range Access | P0031R0 | 7.1 | __cpp_lib_array_constexpr >= 201603 |
| The Parallelism TS Should be Standardized | P0024R2 | 9.1 | __has_include(<execution>) ,
__cpp_lib_execution >= 201603 ,
__cpp_lib_parallel_algorithm >= 201603
(requires linking with -ltbb, see Note 3)
|
| An algorithm to "clamp" a value between a pair of boundary values | P0025R0 | 7.1 | __cpp_lib_clamp >= 201603 |
| Adopt Selected Library Fundamentals V2 Components for C++17 | P0295R0 | 7.1 | __cpp_lib_gcd_lcm >= 201606 |
Proposal to Introduce a 3-Argument Overload to std::hypot | P0030R1 | 7.1 | __cpp_lib_hypot >= 201603 |
| Mathematical Special Functions for C++17 | P0226R1 | 7.1 | __cpp_lib_math_special_functions >= 201603
(see Note 4)
|
| Adopt the File System TS for C++17 | P0218R1 | 8.1 | __has_include(<filesystem>) ,
__cpp_lib_filesystem >= 201603
(GCC 8.x requires linking with -lstdc++fs)
|
| Relative Paths for Filesystem | P0219R1 | 8.1 | __cpp_lib_filesystem >= 201606 |
| Adapting string_view by filesystem paths | P0392R0 | 8.1 | __cpp_lib_filesystem >= 201606 |
| Directory Entry Caching for Filesystem | P0317R1 | 8.1 | __cpp_lib_filesystem >= 201703 |
constexpr atomic<T>::is_always_lock_free | P0152R1 | 7.1 | __cpp_lib_atomic_is_always_lock_free >= 201603 |
A proposal to add shared_mutex (untimed) (Revision 4) | N4508 | 6.1 | __cpp_lib_shared_mutex >= 201505 |
Variadic lock_guard (Rev. 5) | P0156R2 | 7.1 | __cpp_lib_scoped_lock >= 201703 |
| A byte type definition | P0298R3 | 7.1 | __cpp_lib_byte >= 201603 (since 7.3, see Note 2)
|
| Elementary string conversions | P0067R5 | 8.1 (only integral types supported) | __has_include(<charconv>)
__cpp_lib_to_chars >= 201611 |
| Homogeneous interface for variant, any and optional | P0032R3 | 7.1 |
__cpp_lib_any >= 201606 ,
__cpp_lib_optional >= 201606 ,
__cpp_lib_variant >= 201606
|
| Making Optional Greater Equal Again | P0307R2 | 7.1 | __cpp_lib_optional >= 201606 |
Note 1: This feature is supported in GCC 7.1 and 7.2 but before GCC 7.3 the
__cpp_lib macro is not defined, and compilation will fail if the
header is included without using -std to enable C++17 support.
Note 2: This feature is supported in older releases but the
__cpp_lib macro is not defined to the right value
(or not defined at all) until the version shown in parentheses.
Note 3: The Parallel Algorithms have an external dependency on Intel TBB 2018
or later. If the <execution>
header is included then -ltbb must be used to link to TBB.
Note 4: The mathematical special functions are enabled in C++17 mode from
GCC 7.1 onwards. For GCC 6.x or for C++11/C++14 define
__STDCPP_WANT_MATH_SPEC_FUNCS__ to a non-zero value
and test for __STDCPP_MATH_SPEC_FUNCS__ >= 201003L.
Table 1.6. C++ Technical Specifications Implementation Status
| Paper | Title | Status | Comments |
|---|---|---|---|
| N4076 | A generalized callable negator | Y | Library Fundamentals 2 TS |
| N4273 | Uniform Container Erasure | Y | Library Fundamentals 2 TS |
| N4061 | Greatest Common Divisor and Least Common Multiple | Y | Library Fundamentals 2 TS |
| N4066 | Delimited iterators | Y | Library Fundamentals 2 TS |
| N4282 | The World's Dumbest Smart Pointer | Y | Library Fundamentals 2 TS |
| N4388 | Const-Propagating Wrapper | Y | Library Fundamentals 2 TS |
| N4391 | make_array, revision 4 | Y | Library Fundamentals 2 TS |
| N4502 | Support for the C++ Detection Idiom, V2 | Y | Library Fundamentals 2 TS |
| N4519 | Source-Code Information Capture | Y | Library Fundamentals 2 TS |
| N4521 | Merge Fundamentals V1 into V2 |
N (components from V1 are still in namespace
fundamentals_v1)
| Library Fundamentals 2 TS |
| P0013R1 | Logical Operator Type Traits (revision 1) | Y | Library Fundamentals 2 TS |
| N4531 | std::rand replacement, revision 3 | Y | Library Fundamentals 2 TS |
For behaviour which is also specified by previous standards, see C++ 1998/2003 Implementation Specific Behavior and C++ 2011 Implementation Specific Behavior. This section only documents behaviour which is new in the 2017 standard.
20.5.1.2 [headers] Whether names from Annex K are declared by C++ headers depends on whether the underlying C library supports Annex K and declares the names. For the GNU C library, there is no Annex K support and so none of its names are declared by C++ headers.
23.6.5 [optional.bad_optional_access]
what() returns "bad optional access".
23.7.3 [variant.variant]
variant supports over-aligned types.
23.7.10 [variant.bad.access]
what() returns "Unexpected index".
23.12.5.2 [memory.resource.pool.options]
Let S equal numeric_limits<size_t>::digits.
The limit for maximum number of blocks in a chunk is given by
2N-1,
where N is min(19, 3 + S/2).
The largest allocation size that will be allocated from a pool is
222
when S > 20,
otherwise 3072 when S > 16,
otherwise 768.
23.12.6.1 [memory.resource.monotonic.buffer.ctor]
The default next_buffer_size is 128 * sizeof(void*).
The default growth factor is 1.5.
23.15.4.3 [meta.unary.prop]
The predicate condition for
has_unique_object_representations is true for all scalar
types except floating point types.
23.19.3 [execpol.type], 28.4.3 [algorithms.parallel.exec] There are no implementation-defined execution policies.
24.4.2 [string.view.template]
basic_string_view<C, T>::iterator is
C* and
basic_string_view<C, T>::const_iterator is
const C*.
28.4.3 [algorithms.parallel.exec]
Threads of execution created by std::thread
provide concurrent forward progress guarantees, so threads of execution
implicitly created by the library will provide parallel forward
progress guarantees.
29.4.1 [cfenv.syn]
The effects of the <cfenv> functions
depends on whether the FENV_ACCESS pragma is supported,
and on the C library that provides the header.
29.6.9 [c.math.rand]
Whether the rand function may introduce data
races depends on the target C library that provides the function.
29.9.5 [sf.cmath] The effect of calling the mathematical special functions with large inputs should be documented here.
30.10.2.1 [fs.conform.9945] The behavior of the filesystem library implementation will depend on the target operating system. Some features will not be supported on some targets.
30.10.5 [fs.filesystem.syn] The clock used for file times is an unspecified type with a signed 64-bit representation, capable of representing timestamps with nanosecond resolution. The clock's epoch is unspecified, but is not the same as the system clock's epoch.
30.10.7.1 [fs.path.generic]
dot-dot in the root-directory refers to the root-directory itself.
On Windows, a drive specifier such as "C:" or
"z:" is treated as a root-name. On Cygwin, a path
that begins with two successive directory separators is a
root-name. Otherwise (for POSIX-like systems other than Cygwin),
the implementation-defined root-name is an unspecified string
which does not appear in any pathnames.
30.10.10.1 [fs.enum.path.format] The character sequence is always interpreted in the native pathname format.
30.10.15.4 [fs.op.file_size]
If !is_regular_file(p), an error is reported.
In this implementation the -std=gnu++2a or
-std=c++2a flag must be used to enable language
and library
features. See dialect
options. The pre-defined symbol
__cplusplus is used to check for the
presence of the required flag.
This section describes the C++20 and library TS support in the GCC 9 series.
The following table lists new library features that have been accepted into the C++2a working draft. The "Proposal" column provides a link to the ISO C++ committee proposal that describes the feature, while the "Status" column indicates the first version of GCC that contains an implementation of this feature (if it has been implemented). The "SD-6 Feature Test" column shows the corresponding macro or header from SD-6: Feature-testing recommendations for C++.
Table 1.7. C++ 2020 Implementation Status
| Library Feature | Proposal | Status | SD-6 Feature Test |
|---|---|---|---|
| Endian just Endian | P0463R1 | 8.1 | |
Extending make_shared to Support Arrays | P0674R1 | ||
| Floating Point Atomic | P0020R6 | ||
| C++ Synchronized Buffered Ostream | P0053R7 | ||
Add constexpr modifiers to functions in <algorithm> and <utility> Headers | P0202R3 | ||
Constexpr for std::complex | P0415R1 | 9.1 | |
Make std::memory_order a scoped enumeration | P0439R0 | 9.1 | |
| String Prefix and Suffix Checking | P0457R2 | 9.1 | |
Transformation Trait remove_cvref | P0550R2 | 9.1 | |
nodiscard in the Library | P0600R1 | 9.1 | |
de-pessimize legacy algorithms with std::move | P0616R0 | 9.1 | |
| Utility to convert a pointer to a raw pointer | P0653R2 | 8.1 | |
Atomic shared_ptr | P0718R2 | ||
| Deprecate POD | P0767R1 | ||
| Library Support for the Spaceship (Comparison) Operator | P0768R1 | ||
Treating Unnecessary decay | P0777R1 | 9.1 | |
<span> | P0122R7 | ||
| Extending chrono to Calendars and Time Zones | P0355R7 | ||
| Thou Shalt Not Specialize std Function Templates! | P0551R3 | ||
| Manipulators for C++ Synchronized Buffered Ostream | P0753R2 | ||
<version> | P0754R2 | 9.1 | |
| Comparing Unordered Containers | P0809R0 | ||
| Constexpr iterator requirements | P0858R0 | 9.1 | __cpp_lib_string_view >= 201803L
and __cpp_lib_array_constexpr >= 201803L |
| Symmetry for spaceship | P0905R1 | ||
string::reserve Should Not Shrink | P0966R1 | ||
| Atomic Ref | P0019R8 | ||
| Checking for Existence of an Element in Associative Containers | P0458R2 | 9.1 | |
| LWG 2511: guaranteed copy elision for piecewise construction | P0475R1 | 7.1 | |
| Bit-casting object representations | P0476R2 | ||
| The Curious Case of Padding Bits, Featuring Atomic Compare-and-Exchange | P0528R3 | ||
| Support for contract based programming in C++ | P0542R5 | ||
| Integral power-of-2 operations | P0556R3 | 9.1 | |
| Reviewing Deprecated Facilities of C++17 for C++20 | P0619R4 | ||
| Improving the Return Value of Erase-Like Algorithms | P0646R1 | 9.1 | __cpp_lib_list_remove_return_type >= 201806L |
| Efficient sized delete for variable sized classes | P0722R3 | 9.1 | __cpp_lib_destroying_delete >= 201806L |
| Implicit conversion traits and utility functions | P0758R1 | 9.1 | |
fpos Requirements | P0759R1 | Note 1 | |
Add shift to <algorithm> | P0769R2 | ||
| Standard Library Specification in a Concepts and Contracts World | P0788R3 | ||
Constexpr for swap and swap related functions | P0879R0 | ||
The identity metafunction | P0887R1 | 9.1 | |
explicit(bool) | P0892R2 | Note 1 | |
| Standard Library Concepts | P0898R3 | ||
| Eradicating unnecessarily explicit default constructors from the standard library | P0935R0 | 9.1 | |
| Integrating feature-test macros into the C++ WD | P0941R2 | 5.1 | |
constexpr comparison operators for std::array | P1023R0 | ||
| Update The Reference To The Unicode Standard | P1025R1 | ||
Consistency improvements for <=> and other comparison operators | P1120R0 | ||
unwrap_ref_decay and unwrap_reference | P0318R1 | 9.1 | |
| Simplified partial function application | P0356R5 | 9.1 | __cpp_lib_bind_front >= 201811L |
reference_wrapper for incomplete types | P0357R3 | 9.1 | |
char8_t: A type for UTF-8 characters and strings | P0482R6 | 9.1 | __cpp_lib_char8_t >= 201811L |
Fixing operator>>(basic_istream&, CharT*) (LWG 2499) | P0487R1 | ||
| Utility functions to implement uses-allocator construction | P0591R4 | 9.1 |
std::scoped_allocator_adaptor changes missing in 9.1.0
|
P0595R2 std::is_constant_evaluated() | P0595R2 | 9.1 | |
variant and optional should propagate copy/move triviality | P0602R4 | 8.3 | |
A sane variant converting constructor | P0608R3 | ||
visit<R>: Explicit Return Type for visit | P0655R1 | 9.1 | |
std::function move constructor should be noexcept | P0771R1 | 7.2 | |
| The One Ranges Proposal | P0896R4 | ||
| P0899R1 - LWG 3016 is not a defect | P0899R1 | 7.1 | |
| Heterogeneous lookup for unordered containers | P0919R3 | ||
<chrono> zero(), min(), and max() should be noexcept | P0972R0 | 9.1 | |
Constexpr in std::pointer_traits | P1006R1 | 9.1 | |
std::assume_aligned | P1007R3 | 9.1 | |
| Smart pointer creation with default initialization | P1020R1 | ||
| Misc constexpr bits | P1032R1 | ||
| Should Span be Regular? | P1085R2 | ||
| Editorial Guidance for merging P0019r8 and P0528r3 | P1123R0 | Note 1 | |
| Cleaning up Clause 20 | P1148R0 | ||
Make stateful allocator propagation more consistent for operator+(basic_string) | P1165R1 | ||
| Adopt Consistent Container Erasure from Library Fundamentals 2 for C++20 | P1209R0 | 9.1 | __cpp_lib_erase_if >= 201811L |
| Completing the Rebase of Library Fundamentals, Version 3, Working Draft | P1210R0 | ||
| Alternative Wording for P0907R4 Signed Integers are Two's Complement | P1236R1 | ||
| Remove CommonReference requirement from StrictWeakOrdering (a.k.a Fixing Relations) | P1248R1 | ||
| Improving Completeness Requirements for Type Traits | P1285R0 | ||
| Well-behaved interpolation for numbers and pointers | P0811R3 | 9.1 | __cpp_lib_interpolate >= 201902L |
| Missing feature test macros | P1353R0 | 9.1 | |
polymorphic_allocator<>
as a vocabulary type
| P0339R6 | 9.1 | |
| Making std::underlying_type SFINAE-friendly | P0340R3 | 9.1 | |
Make create_directory() Intuitive | P1164R1 | 8.3 | Treated as a DR for C++17 |
| Traits for [Un]bounded Arrays | P1357R1 | 9.1 | __cpp_lib_bounded_array_traits >= 201902L |
Note 1: The changes in the proposal either do not affect the code in libstdc++, or the changes are not required for conformance.
For behaviour which is also specified by previous standards, see C++ 1998/2003 Implementation Specific Behavior, C++ 2011 Implementation Specific Behavior and C++ 2017 Implementation Specific Behavior. This section only documents behaviour which is new in the 202a draft.
This table is based on the table of contents of ISO/IEC DTR 19768 Doc No: N1836=05-0096 Date: 2005-06-24 Draft Technical Report on C++ Library Extensions
In this implementation the header names are prefixed by
tr1/, for instance <tr1/functional>,
<tr1/memory>, and so on.
This page describes the TR1 support in the GCC 9 series.
Table 1.8. C++ TR1 Implementation Status
| Section | Description | Status | Comments |
|---|---|---|---|
| 2 | General Utilities | ||
| 2.1 | Reference wrappers | ||
| 2.1.1 | Additions to header <functional> synopsis | Y | |
| 2.1.2 | Class template reference_wrapper | ||
| 2.1.2.1 | reference_wrapper construct/copy/destroy | Y | |
| 2.1.2.2 | reference_wrapper assignment | Y | |
| 2.1.2.3 | reference_wrapper access | Y | |
| 2.1.2.4 | reference_wrapper invocation | Y | |
| 2.1.2.5 | reference_wrapper helper functions | Y | |
| 2.2 | Smart pointers | ||
| 2.2.1 | Additions to header <memory> synopsis | Y | |
| 2.2.2 | Class bad_weak_ptr | Y | |
| 2.2.3 | Class template shared_ptr |
Uses code from boost::shared_ptr. | |
| 2.2.3.1 | shared_ptr constructors | Y | |
| 2.2.3.2 | shared_ptr destructor | Y | |
| 2.2.3.3 | shared_ptr assignment | Y | |
| 2.2.3.4 | shared_ptr modifiers | Y | |
| 2.2.3.5 | shared_ptr observers | Y | |
| 2.2.3.6 | shared_ptr comparison | Y | |
| 2.2.3.7 | shared_ptr I/O | Y | |
| 2.2.3.8 | shared_ptr specialized algorithms | Y | |
| 2.2.3.9 | shared_ptr casts | Y | |
| 2.2.3.10 | get_deleter | Y | |
| 2.2.4 | Class template weak_ptr | ||
| 2.2.4.1 | weak_ptr constructors | Y | |
| 2.2.4.2 | weak_ptr destructor | Y | |
| 2.2.4.3 | weak_ptr assignment | Y | |
| 2.2.4.4 | weak_ptr modifiers | Y | |
| 2.2.4.5 | weak_ptr observers | Y | |
| 2.2.4.6 | weak_ptr comparison | Y | |
| 2.2.4.7 | weak_ptr specialized algorithms | Y | |
| 2.2.5 | Class template enable_shared_from_this | Y | |
| 3 | Function Objects | ||
| 3.1 | Definitions | Y | |
| 3.2 | Additions to <functional> synopsis | Y | |
| 3.3 | Requirements | Y | |
| 3.4 | Function return types | Y | |
| 3.5 | Function template mem_fn | Y | |
| 3.6 | Function object binders | ||
| 3.6.1 | Class template is_bind_expression | Y | |
| 3.6.2 | Class template is_placeholder | Y | |
| 3.6.3 | Function template bind | Y | |
| 3.6.4 | Placeholders | Y | |
| 3.7 | Polymorphic function wrappers | ||
| 3.7.1 | Class bad_function_call | Y | |
| 3.7.1.1 | bad_function_call constructor | Y | |
| 3.7.2 | Class template function | ||
| 3.7.2.1 | function construct/copy/destroy | Y | |
| 3.7.2.2 | function modifiers | Y | |
| 3.7.2.3 | function capacity | Y | |
| 3.7.2.4 | function invocation | Y | |
| 3.7.2.5 | function target access | Y | |
| 3.7.2.6 | undefined operators | Y | |
| 3.7.2.7 | null pointer comparison operators | Y | |
| 3.7.2.8 | specialized algorithms | Y | |
| 4 | Metaprogramming and type traits | ||
| 4.1 | Requirements | Y | |
| 4.2 | Header <type_traits> synopsis | Y | |
| 4.3 | Helper classes | Y | |
| 4.4 | General Requirements | Y | |
| 4.5 | Unary Type Traits | ||
| 4.5.1 | Primary Type Categories | Y | |
| 4.5.2 | Composite type traits | Y | |
| 4.5.3 | Type properties | Y | |
| 4.6 | Relationships between types | Y | |
| 4.7 | Transformations between types | ||
| 4.7.1 | Const-volatile modifications | Y | |
| 4.7.2 | Reference modifications | Y | |
| 4.7.3 | Array modifications | Y | |
| 4.7.4 | Pointer modifications | Y | |
| 4.8 | Other transformations | Y | |
| 4.9 | Implementation requirements | Y | |
| 5 | Numerical Facilities | ||
| 5.1 | Random number generation | ||
| 5.1.1 | Requirements | Y | |
| 5.1.2 | Header <random> synopsis | Y | |
| 5.1.3 | Class template variate_generator | Y | |
| 5.1.4 | Random number engine class templates | Y | |
| 5.1.4.1 | Class template linear_congruential | Y | |
| 5.1.4.2 | Class template mersenne_twister | Y | |
| 5.1.4.3 | Class template subtract_with_carry | Y | |
| 5.1.4.4 | Class template subtract_with_carry_01 | Y | |
| 5.1.4.5 | Class template discard_block | Y | |
| 5.1.4.6 | Class template xor_combine | Y | operator()() per N2079 |
| 5.1.5 | Engines with predefined parameters | Y | |
| 5.1.6 | Class random_device | Y | |
| 5.1.7 | Random distribution class templates | Y | |
| 5.1.7.1 | Class template uniform_int | Y | |
| 5.1.7.2 | Class bernoulli_distribution | Y | |
| 5.1.7.3 | Class template geometric_distribution | Y | |
| 5.1.7.4 | Class template poisson_distribution | Y | |
| 5.1.7.5 | Class template binomial_distribution | Y | |
| 5.1.7.6 | Class template uniform_real | Y | |
| 5.1.7.7 | Class template exponential_distribution | Y | |
| 5.1.7.8 | Class template normal_distribution | Y | |
| 5.1.7.9 | Class template gamma_distribution | Y | |
| 5.2 | Mathematical special functions | Y | |
| 5.2.1 | Additions to header <cmath> synopsis | Y | |
| 5.2.1.1 | associated Laguerre polynomials | Y | |
| 5.2.1.2 | associated Legendre functions | Y | |
| 5.2.1.3 | beta function | Y | |
| 5.2.1.4 | (complete) elliptic integral of the first kind | Y | |
| 5.2.1.5 | (complete) elliptic integral of the second kind | Y | |
| 5.2.1.6 | (complete) elliptic integral of the third kind | Y | |
| 5.2.1.7 | confluent hypergeometric functions | Y | |
| 5.2.1.8 | regular modified cylindrical Bessel functions | Y | |
| 5.2.1.9 | cylindrical Bessel functions (of the first kind) | Y | |
| 5.2.1.10 | irregular modified cylindrical Bessel functions | Y | |
| 5.2.1.11 | cylindrical Neumann functions | Y | |
| 5.2.1.12 | (incomplete) elliptic integral of the first kind | Y | |
| 5.2.1.13 | (incomplete) elliptic integral of the second kind | Y | |
| 5.2.1.14 | (incomplete) elliptic integral of the third kind | Y | |
| 5.2.1.15 | exponential integral | Y | |
| 5.2.1.16 | Hermite polynomials | Y | |
| 5.2.1.17 | hypergeometric functions | Y | |
| 5.2.1.18 | Laguerre polynomials | Y | |
| 5.2.1.19 | Legendre polynomials | Y | |
| 5.2.1.20 | Riemann zeta function | Y | |
| 5.2.1.21 | spherical Bessel functions (of the first kind) | Y | |
| 5.2.1.22 | spherical associated Legendre functions | Y | |
| 5.2.1.23 | spherical Neumann functions | Y | |
| 5.2.2 | Additions to header <math.h> synopsis | Y | |
| 6 | Containers | ||
| 6.1 | Tuple types | Y | |
| 6.1.1 | Header <tuple> synopsis | Y | |
| 6.1.2 | Additions to header <utility> synopsis | Y | |
| 6.1.3 | Class template tuple | Y | |
| 6.1.3.1 | Construction | Y | |
| 6.1.3.2 | Tuple creation functions | Y | |
| 6.1.3.3 | Tuple helper classes | Y | |
| 6.1.3.4 | Element access | Y | |
| 6.1.3.5 | Relational operators | Y | |
| 6.1.4 | Pairs | Y | |
| 6.2 | Fixed size array | Y | |
| 6.2.1 | Header <array> synopsis | Y | |
| 6.2.2 | Class template array | Y | |
| 6.2.2.1 | array constructors, copy, and assignment | Y | |
| 6.2.2.2 | array specialized algorithms | Y | |
| 6.2.2.3 | array size | Y | |
| 6.2.2.4 | Zero sized arrays | Y | |
| 6.2.2.5 | Tuple interface to class template array | Y | |
| 6.3 | Unordered associative containers | Y | |
| 6.3.1 | Unordered associative container requirements | Y | |
| 6.3.1.1 | Exception safety guarantees | Y | |
| 6.3.2 | Additions to header <functional> synopsis | Y | |
| 6.3.3 | Class template hash | Y | |
| 6.3.4 | Unordered associative container classes | Y | |
| 6.3.4.1 | Header <unordered_set> synopsis | Y | |
| 6.3.4.2 | Header <unordered_map> synopsis | Y | |
| 6.3.4.3 | Class template unordered_set | Y | |
| 6.3.4.3.1 | unordered_set constructors | Y | |
| 6.3.4.3.2 | unordered_set swap | Y | |
| 6.3.4.4 | Class template unordered_map | Y | |
| 6.3.4.4.1 | unordered_map constructors | Y | |
| 6.3.4.4.2 | unordered_map element access | Y | |
| 6.3.4.4.3 | unordered_map swap | Y | |
| 6.3.4.5 | Class template unordered_multiset | Y | |
| 6.3.4.5.1 | unordered_multiset constructors | Y | |
| 6.3.4.5.2 | unordered_multiset swap | Y | |
| 6.3.4.6 | Class template unordered_multimap | Y | |
| 6.3.4.6.1 | unordered_multimap constructors | Y | |
| 6.3.4.6.2 | unordered_multimap swap | Y | |
| 7 | Regular Expressions | ||
| 7.1 | Definitions | N | |
| 7.2 | Requirements | N | |
| 7.3 | Regular expressions summary | N | |
| 7.4 | Header <regex> synopsis | N | |
| 7.5 | Namespace tr1::regex_constants | N | |
| 7.5.1 | Bitmask Type syntax_option_type | N | |
| 7.5.2 | Bitmask Type regex_constants::match_flag_type | N | |
| 7.5.3 | Implementation defined error_type | N | |
| 7.6 | Class regex_error | N | |
| 7.7 | Class template regex_traits | N | |
| 7.8 | Class template basic_regex | N | |
| 7.8.1 | basic_regex constants | N | |
| 7.8.2 | basic_regex constructors | N | |
| 7.8.3 | basic_regex assign | N | |
| 7.8.4 | basic_regex constant operations | N | |
| 7.8.5 | basic_regex locale | N | |
| 7.8.6 | basic_regex swap | N | |
| 7.8.7 | basic_regex non-member functions | N | |
| 7.8.7.1 | basic_regex non-member swap | N | |
| 7.9 | Class template sub_match | N | |
| 7.9.1 | sub_match members | N | |
| 7.9.2 | sub_match non-member operators | N | |
| 7.10 | Class template match_results | N | |
| 7.10.1 | match_results constructors | N | |
| 7.10.2 | match_results size | N | |
| 7.10.3 | match_results element access | N | |
| 7.10.4 | match_results formatting | N | |
| 7.10.5 | match_results allocator | N | |
| 7.10.6 | match_results swap | N | |
| 7.11 | Regular expression algorithms | N | |
| 7.11.1 | exceptions | N | |
| 7.11.2 | regex_match | N | |
| 7.11.3 | regex_search | N | |
| 7.11.4 | regex_replace | N | |
| 7.12 | Regular expression Iterators | N | |
| 7.12.1 | Class template regex_iterator | N | |
| 7.12.1.1 | regex_iterator constructors | N | |
| 7.12.1.2 | regex_iterator comparisons | N | |
| 7.12.1.3 | regex_iterator dereference | N | |
| 7.12.1.4 | regex_iterator increment | N | |
| 7.12.2 | Class template regex_token_iterator | N | |
| 7.12.2.1 | regex_token_iterator constructors | N | |
| 7.12.2.2 | regex_token_iterator comparisons | N | |
| 7.12.2.3 | regex_token_iterator dereference | N | |
| 7.12.2.4 | regex_token_iterator increment | N | |
| 7.13 | Modified ECMAScript regular expression grammar | N | |
| 8 | C Compatibility | ||
| 8.1 | Additions to header <complex> | Y | |
| 8.1.1 | Synopsis | Y | |
| 8.1.2 | Function acos | Y | |
| 8.1.3 | Function asin | Y | |
| 8.1.4 | Function atan | Y | |
| 8.1.5 | Function acosh | Y | |
| 8.1.6 | Function asinh | Y | |
| 8.1.7 | Function atanh | Y | |
| 8.1.8 | Function fabs | Y | |
| 8.1.9 | Additional Overloads | Y | |
| 8.2 | Header <ccomplex> | N | DR 551 |
| 8.3 | Header <complex.h> | N | DR 551 |
| 8.4 | Additions to header <cctype> | Y | |
| 8.4.1 | Synopsis | Y | |
| 8.4.2 | Function isblank | Y | |
| 8.5 | Additions to header <ctype.h> | Y | |
| 8.6 | Header <cfenv> | Y | |
| 8.6.1 | Synopsis | Y | |
| 8.6.2 | Definitions | Y | |
| 8.7 | Header <fenv.h> | Y | |
| 8.8 | Additions to header <cfloat> | Y | |
| 8.9 | Additions to header <float.h> | Y | |
| 8.10 | Additions to header <ios> | N | |
| 8.10.1 | Synopsis | N | |
| 8.10.2 | Function hexfloat | N | |
| 8.11 | Header <cinttypes> | Y | |
| 8.11.1 | Synopsis | Y | DR 557 |
| 8.11.2 | Definitions | Y | |
| 8.12 | Header <inttypes.h> | Y | |
| 8.13 | Additions to header <climits> | Y | |
| 8.14 | Additions to header <limits.h> | Y | |
| 8.15 | Additions to header <locale> | N | |
| 8.16 | Additions to header <cmath> | Y | |
| 8.16.1 | Synopsis | Y | |
| 8.16.2 | Definitions | Y | |
| 8.16.3 | Function template definitions | Y | |
| 8.16.4 | Additional overloads | Y | DR 568; DR 550 |
| 8.17 | Additions to header <math.h> | Y | |
| 8.18 | Additions to header <cstdarg> | Y | |
| 8.19 | Additions to header <stdarg.h> | Y | |
| 8.20 | The header <cstdbool> | Y | |
| 8.21 | The header <stdbool.h> | Y | |
| 8.22 | The header <cstdint> | Y | |
| 8.22.1 | Synopsis | Y | |
| 8.22.2 | Definitions | Y | |
| 8.23 | The header <stdint.h> | Y | |
| 8.24 | Additions to header <cstdio> | Y | |
| 8.24.1 | Synopsis | Y | |
| 8.24.2 | Definitions | Y | |
| 8.24.3 | Additional format specifiers | Y | C library dependency |
| 8.24.4 | Additions to header <stdio.h> | Y | |
| 8.25 | Additions to header <cstdlib> | Y | |
| 8.25.1 | Synopsis | Y | |
| 8.25.2 | Definitions | Y | |
| 8.25.3 | Function abs | Y | |
| 8.25.4 | Function div | Y | |
| 8.26 | Additions to header <stdlib.h> | Y | |
| 8.27 | Header <ctgmath> | Y | DR 551 |
| 8.28 | Header <tgmath.h> | Y | DR 551 |
| 8.29 | Additions to header <ctime> | Y | C library dependency |
| 8.30 | Additions to header <cwchar> | Y | |
| 8.30.1 | Synopsis | Y | |
| 8.30.2 | Definitions | Y | |
| 8.30.3 | Additional wide format specifiers | Y | C library dependency |
| 8.31 | Additions to header <wchar.h> | Y | |
| 8.32 | Additions to header <cwctype> | Y | |
| 8.32.1 | Synopsis | Y | |
| 8.32.2 | Function iswblank | Y | |
| 8.33 | Additions to header <wctype.h> | Y | |
For behaviour which is specified by the 1998 and 2003 standards, see C++ 1998/2003 Implementation Specific Behavior. This section documents behaviour which is required by TR1.
3.6.4 [tr.func.bind.place]/1 There are 29
placeholders defined and the placeholder types are
Assignable.
This table is based on the table of contents of ISO/IEC TR 24733 Date: 2009-08-28 Extension for the programming language C++ to support decimal floating-point arithmetic
This page describes the TR 24733 support in the GCC 9 series.
Table 1.9. C++ TR 24733 Implementation Status
| Section | Description | Status | Comments |
|---|---|---|---|
| 0 | Introduction | ||
| 1 | Normative references | ||
| 2 | Conventions | ||
| 3 | Decimal floating-point types | ||
| 3.1 | Characteristics of decimal floating-point types | ||
| 3.2 | Decimal Types | ||
| 3.2.1 | Class decimal synopsis | Partial | Missing declarations for formatted input/output; non-conforming extension for functions converting to integral type |
| 3.2.2 | Class decimal32 | Partial | Missing 3.2.2.5 conversion to integral type; conforming extension for conversion from scalar decimal floating-point |
| 3.2.3 | Class decimal64 | Partial | Missing 3.2.3.5 conversion to integral type; conforming extension for conversion from scalar decimal floating-point |
| 3.2.4 | Class decimal128 | Partial | Missing 3.2.4.5 conversion to integral type; conforming extension for conversion from scalar decimal floating-point |
| 3.2.5 | Initialization from coefficient and exponent | Y | |
| 3.2.6 | Conversion to generic floating-point type | Y | |
| 3.2.7 | Unary arithmetic operators | Y | |
| 3.2.8 | Binary arithmetic operators | Y | |
| 3.2.9 | Comparison operators | Y | |
| 3.2.10 | Formatted input | N | |
| 3.2.11 | Formatted output | N | |
| 3.3 | Additions to header limits | N | |
| 3.4 | Headers cfloat and float.h | ||
| 3.4.2 | Additions to header cfloat synopsis | Y | |
| 3.4.3 | Additions to header float.h synopsis | N | |
| 3.4.4 | Maximum finite value | Y | |
| 3.4.5 | Epsilon | Y | |
| 3.4.6 | Minimum positive normal value | Y | |
| 3.4.7 | Minimum positive subnormal value | Y | |
| 3.4.8 | Evaluation format | Y | |
| 3.5 | Additions to cfenv and fenv.h | Outside the scope of GCC | |
| 3.6 | Additions to cmath and math.h | Outside the scope of GCC | |
| 3.7 | Additions to cstdio and stdio.h | Outside the scope of GCC | |
| 3.8 | Additions to cstdlib and stdlib.h | Outside the scope of GCC | |
| 3.9 | Additions to cwchar and wchar.h | Outside the scope of GCC | |
| 3.10 | Facets | N | |
| 3.11 | Type traits | N | |
| 3.12 | Hash functions | N | |
| 4 | Notes on C compatibility | ||
This table is based on the table of contents of ISO/IEC FDIS 29124 Doc No: N3060 Date: 2010-03-06 Extensions to the C++ Library to support mathematical special functions
Complete support for IS 29124 is in GCC 6.1 and later releases, when using
at least C++11 (for older releases or C++98/C++03 use TR1 instead).
For C++11 and C++14 the additions to the library are not declared by their
respective headers unless __STDCPP_WANT_MATH_SPEC_FUNCS__
is defined as a macro that expands to a non-zero integer constant.
For C++17 the special functions are always declared (since GCC 7.1).
When the special functions are declared the macro
__STDCPP_MATH_SPEC_FUNCS__ is defined to 201003L.
In addition to the special functions defined in IS 29124, for
non-strict modes (i.e. -std=gnu++NN modes) the
hypergeometric functions and confluent hypergeometric functions
from TR1 are also provided, defined in namespace
__gnu_cxx.
Table 1.10. C++ Special Functions Implementation Status
| Section | Description | Status | Comments |
|---|---|---|---|
| 7 | Macro names | Partial | No diagnostic for inconsistent definitions of
__STDCPP_WANT_MATH_SPEC_FUNCS__ |
| 8 | Mathematical special functions | Y | |
| 8.1 | Additions to header <cmath> synopsis | Y | |
| 8.1.1 | associated Laguerre polynomials | Y | |
| 8.1.2 | associated Legendre functions | Y | |
| 8.1.3 | beta function | Y | |
| 8.1.4 | (complete) elliptic integral of the first kind | Y | |
| 8.1.5 | (complete) elliptic integral of the second kind | Y | |
| 8.1.6 | (complete) elliptic integral of the third kind | Y | |
| 8.1.7 | regular modified cylindrical Bessel functions | Y | |
| 8.1.8 | cylindrical Bessel functions (of the first kind) | Y | |
| 8.1.9 | irregular modified cylindrical Bessel functions | Y | |
| 8.1.10 | cylindrical Neumann functions | Y | |
| 8.1.11 | (incomplete) elliptic integral of the first kind | Y | |
| 8.1.12 | (incomplete) elliptic integral of the second kind | Y | |
| 8.1.13 | (incomplete) elliptic integral of the third kind | Y | |
| 8.1.14 | exponential integral | Y | |
| 8.1.15 | Hermite polynomials | Y | |
| 8.1.16 | Laguerre polynomials | Y | |
| 8.1.17 | Legendre polynomials | Y | |
| 8.1.18 | Riemann zeta function | Y | |
| 8.1.19 | spherical Bessel functions (of the first kind) | Y | |
| 8.1.20 | spherical associated Legendre functions | Y | |
| 8.1.21 | spherical Neumann functions | Y | |
| 8.2 | Additions to header <math.h> | Y | |
| 8.3 | The header <ctgmath> | Partial | Conflicts with C++ 2011 requirements. |
| 8.4 | The header <tgmath.h> | N | Conflicts with C++ 2011 requirements. |
For behaviour which is specified by the 2011 standard, see C++ 2011 Implementation Specific Behavior. This section documents behaviour which is required by IS 29124.
7.2 [macro.user]/3 /4 The functions declared in
Clause 8 are only declared when
__STDCPP_WANT_MATH_SPEC_FUNCS__ == 1
(or in C++17 mode, for GCC 7.1 and later).
8.1.1 [sf.cmath.Lnm]/1 The effect of calling
these functions with n >= 128 or m >= 128
should be described here.
8.1.2 [sf.cmath.Plm]/3 The effect of calling
these functions with l >= 128 should be described here.
8.1.3 [sf.cmath.I]/3 The effect of calling
these functions with nu >= 128 should be described here.
8.1.8 [sf.cmath.J]/3 The effect of calling
these functions with nu >= 128 should be described here.
8.1.9 [sf.cmath.K]/3 The effect of calling
these functions with nu >= 128 should be described here.
8.1.10 [sf.cmath.N]/3 The effect of calling
these functions with nu >= 128 should be described here.
8.1.15 [sf.cmath.Hn]/3 The effect of calling
these functions with n >= 128 should be described here.
8.1.16 [sf.cmath.Ln]/3 The effect of calling
these functions with n >= 128 should be described here.
8.1.17 [sf.cmath.Pl]/3 The effect of calling
these functions with l >= 128 should be described here.
8.1.19 [sf.cmath.j]/3 The effect of calling
these functions with n >= 128 should be described here.
8.1.20 [sf.cmath.Ylm]/3 The effect of calling
these functions with l >= 128 should be described here.
8.1.21 [sf.cmath.n]/3 The effect of calling
these functions with n >= 128 should be described here.