[Bug libstdc++/79162] [7 Regression] [C++17] ambiguity in string assignment due to string_view overload

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79162

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Tue Mar 14 14:51:19 2017
New Revision: 246128

URL: https://gcc.gnu.org/viewcvs?rev=246128&root=gcc&view=rev
Log:
PR libstdc++/79162 disambiguate assignment from string_view

        PR libstdc++/79162
        * include/bits/basic_string.h [_GLIBCXX_USE_CXX11_ABI]
        (basic_string<C,T,A>::operator=(basic_string_view<C,T>)): Replace
        with a constrained template.
        [!_GLIBCXX_USE_CXX11_ABI]
        (basic_string<C,T,A>::operator=(basic_string_view<C,T>)): Likewise.
        * testsuite/21_strings/basic_string/cons/char/79162.cc: New test.
        * testsuite/21_strings/basic_string/cons/wchar_t/79162.cc: New test.

Added:
    trunk/libstdc++-v3/testsuite/21_strings/basic_string/cons/char/79162.cc
    trunk/libstdc++-v3/testsuite/21_strings/basic_string/cons/wchar_t/79162.cc
Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/include/bits/basic_string.h