r265088 - in /branches/gcc-8-branch/libstdc++-v...

[redi@gcc.gnu.org]

Author: redi
Date: Fri Oct 12 12:28:48 2018
New Revision: 265088

URL: https://gcc.gnu.org/viewcvs?rev=265088&root=gcc&view=rev
Log:
PR libstdc++/78595 implement insertion into maps in terms of emplace

C++14 simplified the specification of the generic insert function
templates to be equivalent to calling emplace (or emplace_hint).
Defining them in terms of emplace takes care of the problems described
in PR 78595, ensuring a single conversion to value_type is done at the
right time.

Backport from mainline
2018-09-03  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/78595
	* include/bits/stl_map.h (map::insert(_Pair&&))
	(map::insert(const_iterator, _Pair&&)): Do emplace instead of insert.
	* include/bits/stl_multimap.h (multimap::insert(_Pair&&))
	(multimap::insert(const_iterator, _Pair&&)): Likewise.
	* include/bits/unordered_map.h (unordered_map::insert(_Pair&&))
	(unordered_map::insert(const_iterator, _Pair&&))
	(unordered_multimap::insert(_Pair&&))
	(unordered_multimap::insert(const_iterator, _Pair&&)): Likewise.
	* include/std/type_traits (__enable_if_t): Define for C++11.
	* testsuite/23_containers/map/modifiers/insert/78595.cc: New test.
	* testsuite/23_containers/multimap/modifiers/insert/78595.cc: New test.
	* testsuite/23_containers/unordered_map/modifiers/78595.cc: New test.
	* testsuite/23_containers/unordered_multimap/modifiers/78595.cc: New
	test.

Added:
    branches/gcc-8-branch/libstdc++-v3/testsuite/23_containers/map/modifiers/insert/78595.cc
    branches/gcc-8-branch/libstdc++-v3/testsuite/23_containers/multimap/modifiers/insert/78595.cc
    branches/gcc-8-branch/libstdc++-v3/testsuite/23_containers/unordered_map/modifiers/78595.cc
    branches/gcc-8-branch/libstdc++-v3/testsuite/23_containers/unordered_multimap/modifiers/78595.cc
Modified:
    branches/gcc-8-branch/libstdc++-v3/ChangeLog
    branches/gcc-8-branch/libstdc++-v3/include/bits/stl_map.h
    branches/gcc-8-branch/libstdc++-v3/include/bits/stl_multimap.h
    branches/gcc-8-branch/libstdc++-v3/include/bits/unordered_map.h
    branches/gcc-8-branch/libstdc++-v3/include/std/type_traits