[Bug c++/56889] New: =delete(ing) default copy and move operations for a polymorphic type gives compilation error messages
amalisperid at yahoo dot com
gcc-bugzilla@gcc.gnu.org
Tue Apr 9 06:02:00 GMT 2013
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56889
Bug #: 56889
Summary: =delete(ing) default copy and move operations for a
polymorphic type gives compilation error messages
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: amalisperid@yahoo.com
Created attachment 29834
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29834
smalltestfile
when I add
Stack(const Stack&)=delete;
Stack& operator=(const Stack&)=delete;
//no move operations
Stack(Stack&&)=delete;
Stack& operator=(Stack&&)=delete;
to the stack polymorphic type in the attached file, the compiler gives error
messages. But if I don't add these methods, as Bjarne Stroutstrup's programming
language fourth edition-third chapter draft copy- says,
'In case you forgot to delete a copy or move operation, no harm is done. A move
operation is not implicitly generated for a class where the user has explicitly
declared a destructor. Furthermore, the generation of copy operations are
deprecated in this case
(§42.2.3). This can be a good reason to explicitly define a destructor even
where the compiler would have implicitly provided one (§17.2.3).
The C++ Programming Language, 4th edition ©2012 by Pearson Education, Inc.
Reproduced in draft form with the permission of the publisher.', my program
gives nomore compiler error messages, and it works as I expect it to.
However, I think the compiler should allow me to specify the copy and move
methods as =delete in the Stack polymorphic type.
-------------- Build: Debug in TestforError ---------------
x86_64-w64-mingw32-g++.exe -Wall -fexceptions -g -std=c++0x -Wextra -Wall -v
-save-temps -fno-strict-aliasing -fwrapv -c "C:\Users\Pugazhendhi
Albert\Desktop\Amali\TestforError\main.cpp" -o obj\Debug\main.o
Using built-in specs.
COLLECT_GCC=x86_64-w64-mingw32-g++.exe
Target: x86_64-w64-mingw32
Configured with: ../../../src/gcc-4.8.0/configure --host=x86_64-w64-mingw32
--build=x86_64-w64-mingw32 --target=x86_64-w64-mingw32 --prefix=/mingw64
--with-sysroot=/temp/x64-480-win32-seh-r1/mingw64 --enable-shared
--enable-static --disable-multilib --enable-languages=c,c++,fortran,lto
--enable-libstdcxx-time=yes --enable-threads=win32 --enable-libgomp
--enable-lto --enable-graphite --enable-checking=release
--enable-fully-dynamic-string --enable-version-specific-runtime-libs
--disable-isl-version-check --disable-cloog-version-check
--disable-libstdcxx-pch --disable-libstdcxx-debug --disable-bootstrap
--disable-rpath --disable-win32-registry --disable-nls --disable-werror
--disable-symvers --with-gnu-as --with-gnu-ld --with-arch=nocona
--with-tune=core2 --with-host-libstdcxx='-static -lstdc++' --with-libiconv
--with-system-zlib --with-gmp=/temp/mingw-prereq/x86_64-w64-mingw32-static
--with-mpfr=/temp/mingw-prereq/x86_64-w64-mingw32-static
--with-mpc=/temp/mingw-prereq/x86_64-w64-mingw32-static
--with-isl=/temp/mingw-prereq/x86_64-w64-mingw32-static
--with-cloog=/temp/mingw-prereq/x86_64-w64-mingw32-static
--enable-cloog-backend=isl --with-pkgversion='rev1, Built by MinGW-builds
project' --with-bugurl=http://sourceforge.net/projects/mingwbuilds/ CFLAGS='-O2
-pipe -I/temp/x64-480-win32-seh-r1/libs/include
-I/temp/mingw-prereq/x64-zlib/include
-I/temp/mingw-prereq/x86_64-w64-mingw32-static/include' CXXFLAGS='-O2 -pipe
-I/temp/x64-480-win32-seh-r1/libs/include -I/temp/mingw-prereq/x64-zlib/include
-I/temp/mingw-prereq/x86_64-w64-mingw32-static/include' CPPFLAGS=
LDFLAGS='-pipe -L/temp/x64-480-win32-seh-r1/libs/lib
-L/temp/mingw-prereq/x64-zlib/lib
-L/temp/mingw-prereq/x86_64-w64-mingw32-static/lib
-L/temp/x64-480-win32-seh-r1/mingw64/opt/lib'
Thread model: win32
gcc version 4.8.0 (rev1, Built by MinGW-builds project)
COLLECT_GCC_OPTIONS='-fexceptions' '-g' '-std=c++11' '-Wextra' '-Wall' '-v'
'-save-temps' '-fno-strict-aliasing' '-fwrapv' '-c' '-o' 'obj\Debug\main.o'
'-shared-libgcc' '-mtune=core2' '-march=nocona'
c:/amali/x64-4.8.0-release-win32-seh-rev1/mingw64/bin/../libexec/gcc/x86_64-w64-mingw32/4.8.0/cc1plus.exe
-E -quiet -v -iprefix
c:\amali\x64-4.8.0-release-win32-seh-rev1\mingw64\bin\../lib/gcc/x86_64-w64-mingw32/4.8.0/
-U_REENTRANT C:\Users\Pugazhendhi Albert\Desktop\Amali\TestforError\main.cpp
-mtune=core2 -march=nocona -std=c++11 -Wextra -Wall -fexceptions
-fno-strict-aliasing -fwrapv -g -fworking-directory -fpch-preprocess -o main.ii
ignoring duplicate directory
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ignoring duplicate directory
"c:/amali/x64-4.8.0-release-win32-seh-rev1/mingw64/lib/gcc/../../lib/gcc/x86_64-w64-mingw32/4.8.0/include/c++/x86_64-w64-mingw32"
ignoring duplicate directory
"c:/amali/x64-4.8.0-release-win32-seh-rev1/mingw64/lib/gcc/../../lib/gcc/x86_64-w64-mingw32/4.8.0/include/c++/backward"
ignoring duplicate directory
"c:/amali/x64-4.8.0-release-win32-seh-rev1/mingw64/lib/gcc/../../lib/gcc/x86_64-w64-mingw32/4.8.0/include"
ignoring nonexistent directory
"C:/gccbuild/msys/temp/x64-480-win32-seh-r1/mingw64C:/gccbuild/msys/mingw64/lib/gcc/x86_64-w64-mingw32/4.8.0/../../../../include"
ignoring duplicate directory
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ignoring duplicate directory
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ignoring nonexistent directory
"C:/gccbuild/msys/temp/x64-480-win32-seh-r1/mingw64/mingw/include"
#include "..." search starts here:
#include <...> search starts here:
c:\amali\x64-4.8.0-release-win32-seh-rev1\mingw64\bin\../lib/gcc/x86_64-w64-mingw32/4.8.0/include/c++
c:\amali\x64-4.8.0-release-win32-seh-rev1\mingw64\bin\../lib/gcc/x86_64-w64-mingw32/4.8.0/include/c++/x86_64-w64-mingw32
c:\amali\x64-4.8.0-release-win32-seh-rev1\mingw64\bin\../lib/gcc/x86_64-w64-mingw32/4.8.0/include/c++/backward
c:\amali\x64-4.8.0-release-win32-seh-rev1\mingw64\bin\../lib/gcc/x86_64-w64-mingw32/4.8.0/include
c:\amali\x64-4.8.0-release-win32-seh-rev1\mingw64\bin\../lib/gcc/x86_64-w64-mingw32/4.8.0/include-fixed
c:\amali\x64-4.8.0-release-win32-seh-rev1\mingw64\bin\../lib/gcc/x86_64-w64-mingw32/4.8.0/../../../../x86_64-w64-mingw32/include
End of search list.
COLLECT_GCC_OPTIONS='-fexceptions' '-g' '-std=c++11' '-Wextra' '-Wall' '-v'
'-save-temps' '-fno-strict-aliasing' '-fwrapv' '-c' '-o' 'obj\Debug\main.o'
'-shared-libgcc' '-mtune=core2' '-march=nocona'
c:/amali/x64-4.8.0-release-win32-seh-rev1/mingw64/bin/../libexec/gcc/x86_64-w64-mingw32/4.8.0/cc1plus.exe
-fpreprocessed main.ii -quiet -dumpbase main.cpp -mtune=core2 -march=nocona
-auxbase-strip obj\Debug\main.o -g -Wextra -Wall -std=c++11 -version
-fexceptions -fno-strict-aliasing -fwrapv -o main.s
GNU C++ (rev1, Built by MinGW-builds project) version 4.8.0
(x86_64-w64-mingw32)
compiled by GNU C version 4.7.2, GMP version 5.1.1, MPFR version 3.1.2, MPC
version 1.0.1
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU C++ (rev1, Built by MinGW-builds project) version 4.8.0
(x86_64-w64-mingw32)
compiled by GNU C version 4.7.2, GMP version 5.1.1, MPFR version 3.1.2, MPC
version 1.0.1
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 198a59f18ac22b34b3ce85756ec21810
C:\Users\Pugazhendhi Albert\Desktop\Amali\TestforError\main.cpp: In function
'void StackAbst::constanduse()':
C:\Users\Pugazhendhi Albert\Desktop\Amali\TestforError\main.cpp:92:46: error:
use of deleted function
'StackAbst::vector_stack<int>::vector_stack(std::initializer_list<int>)'
vector_stack<int> vst{1,2,3,4,5,6,7,8,9,10};
^
C:\Users\Pugazhendhi Albert\Desktop\Amali\TestforError\main.cpp:39:19: note:
'StackAbst::vector_stack<int>::vector_stack(std::initializer_list<int>)' is
implicitly deleted because the default definition would be ill-formed:
using Base::Base;
^
C:\Users\Pugazhendhi Albert\Desktop\Amali\TestforError\main.cpp:39:19: error:
no matching function for call to 'StackAbst::Stack<int>::Stack()'
C:\Users\Pugazhendhi Albert\Desktop\Amali\TestforError\main.cpp:39:19: note:
candidates are:
C:\Users\Pugazhendhi Albert\Desktop\Amali\TestforError\main.cpp:19:4: note:
StackAbst::Stack<T>::Stack(StackAbst::Stack<T>&&) [with T = int] <deleted>
Stack(Stack&&)=delete;
^
C:\Users\Pugazhendhi Albert\Desktop\Amali\TestforError\main.cpp:19:4: note:
candidate expects 1 argument, 0 provided
C:\Users\Pugazhendhi Albert\Desktop\Amali\TestforError\main.cpp:16:4: note:
StackAbst::Stack<T>::Stack(const StackAbst::Stack<T>&) [with T = int] <deleted>
Stack(const Stack&)=delete;
^
C:\Users\Pugazhendhi Albert\Desktop\Amali\TestforError\main.cpp:16:4: note:
candidate expects 1 argument, 0 provided
C:\Users\Pugazhendhi Albert\Desktop\Amali\TestforError\main.cpp: In
instantiation of 'StackAbst::vector_stack<T>*
StackAbst::vector_stack<T>::clone() const [with T = int]':
C:\Users\Pugazhendhi Albert\Desktop\Amali\TestforError\main.cpp:102:1:
required from here
C:\Users\Pugazhendhi Albert\Desktop\Amali\TestforError\main.cpp:43:39: error:
use of deleted function 'StackAbst::vector_stack<int>::vector_stack(const
StackAbst::vector_stack<int>&)'
return new vector_stack(*this); // using copy constructor
^
C:\Users\Pugazhendhi Albert\Desktop\Amali\TestforError\main.cpp:32:7: note:
'StackAbst::vector_stack<int>::vector_stack(const
StackAbst::vector_stack<int>&)' is implicitly deleted because the default
definition would be ill-formed:
class vector_stack : public Stack<T>, private std::vector<T>{
^
C:\Users\Pugazhendhi Albert\Desktop\Amali\TestforError\main.cpp:32:7: error:
use of deleted function 'StackAbst::Stack<T>::Stack(const StackAbst::Stack<T>&)
[with T = int]'
C:\Users\Pugazhendhi Albert\Desktop\Amali\TestforError\main.cpp:16:4: error:
declared here
Stack(const Stack&)=delete;
^
Process terminated with status 1 (0 minutes, 0 seconds)
13 errors, 0 warnings
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