[Bug libstdc++/64584] basic_regex::assign breaks *this if it throws regex_error

[timshen at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64584

--- Comment #1 from Tim Shen <timshen at gcc dot gnu.org> ---
Author: timshen
Date: Mon Jan 19 22:56:04 2015
New Revision: 219865

URL: https://gcc.gnu.org/viewcvs?rev=219865&root=gcc&view=rev
Log:
    PR libstdc++/64584
    PR libstdc++/64585
    * include/bits/regex.h (basic_regex<>::basic_regex,
    basic_regex<>::assign, basic_regex<>::imbue,
    basic_regex<>::swap, basic_regex<>::mark_count): Drop NFA after
    imbuing basic_regex; Make assign() transactional against exception.
    * include/bits/regex_compiler.h (__compile_nfa<>): Add back
    __compile_nfa SFINAE.
    * include/std/regex: Adjust include order to avoid __compile_nfa
    forward declaration.
    * testsuite/28_regex/basic_regex/assign/char/string.cc: New testcase.
    * testsuite/28_regex/basic_regex/imbue/string.cc: New testcase.

Added:
    trunk/libstdc++-v3/testsuite/28_regex/basic_regex/imbue/
    trunk/libstdc++-v3/testsuite/28_regex/basic_regex/imbue/string.cc
Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/include/bits/regex.h
    trunk/libstdc++-v3/include/bits/regex_compiler.h
    trunk/libstdc++-v3/include/std/regex
    trunk/libstdc++-v3/testsuite/28_regex/basic_regex/assign/char/string.cc