r245086 - in /branches/gcc-6-branch/libstdc++-v...

[redi@gcc.gnu.org]

Author: redi
Date: Wed Feb  1 12:12:28 2017
New Revision: 245086

URL: https://gcc.gnu.org/viewcvs?rev=245086&root=gcc&view=rev
Log:
PR libstdc++/79254 fix exception-safety of std::string copy assignment

	PR libstdc++/79254
	* include/bits/basic_string.h [_GLIBCXX_USE_CXX11_ABI]
	(basic_string::operator=(const basic_string&)): If source object is
	small just deallocate, otherwise perform new allocation before
	making any changes.
	* testsuite/21_strings/basic_string/allocator/wchar_t/copy_assign.cc:
	Test exception-safety of copy assignment when allocator propagates.
	* testsuite/21_strings/basic_string/allocator/char/copy_assign.cc:
	Likewise.
	* testsuite/util/testsuite_allocator.h (uneq_allocator::swap): Make
	std::swap visible.

Modified:
    branches/gcc-6-branch/libstdc++-v3/ChangeLog
    branches/gcc-6-branch/libstdc++-v3/include/bits/basic_string.h
    branches/gcc-6-branch/libstdc++-v3/testsuite/21_strings/basic_string/allocator/char/copy_assign.cc
    branches/gcc-6-branch/libstdc++-v3/testsuite/21_strings/basic_string/allocator/wchar_t/copy_assign.cc
    branches/gcc-6-branch/libstdc++-v3/testsuite/util/testsuite_allocator.h