https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78595
--- Comment #16 from Jonathan Wakely <redi at gcc dot gnu.org> --- Author: redi Date: Fri Oct 12 12:51:40 2018 New Revision: 265095 URL: https://gcc.gnu.org/viewcvs?rev=265095&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 <jwak...@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-7-branch/libstdc++-v3/testsuite/23_containers/map/modifiers/insert/78595.cc branches/gcc-7-branch/libstdc++-v3/testsuite/23_containers/multimap/modifiers/insert/78595.cc branches/gcc-7-branch/libstdc++-v3/testsuite/23_containers/unordered_map/modifiers/78595.cc branches/gcc-7-branch/libstdc++-v3/testsuite/23_containers/unordered_multimap/modifiers/78595.cc Modified: branches/gcc-7-branch/libstdc++-v3/ChangeLog branches/gcc-7-branch/libstdc++-v3/include/bits/stl_map.h branches/gcc-7-branch/libstdc++-v3/include/bits/stl_multimap.h branches/gcc-7-branch/libstdc++-v3/include/bits/unordered_map.h branches/gcc-7-branch/libstdc++-v3/include/std/type_traits
