https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79162
Bug ID: 79162
Summary: [7 Regression] [C++17] ambiguity in string assignment
due to string_view overload
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Keywords: rejects-valid
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: redi at gcc dot gnu.org
Target Milestone: ---
#include <string>
int main() {
std::string s;
s = {"abc", 1};
}
This compiled with GCC 6, but with 7 gives:
s.cc: In function ‘int main()’:
s.cc:5:15: error: ambiguous overload for ‘operator=’ (operand types are
‘std::__cxx11::string {aka std::__cxx11::basic_string<char>}’ and
‘<brace-enclosed initializer list>’)
s = {"abc", 1};
^
In file included from /home/jwakely/gcc/7/include/c++/7.0.0/string:52:0,
from s.cc:1:
/home/jwakely/gcc/7/include/c++/7.0.0/bits/basic_string.h:627:7: note:
candidate: std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&
std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::operator=(const
std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char;
_Traits = std::char_traits<char>; _Alloc = std::allocator<char>]
operator=(const basic_string& __str)
^~~~~~~~
/home/jwakely/gcc/7/include/c++/7.0.0/bits/basic_string.h:680:7: note:
candidate: std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&
std::__cxx11::basic_string<_CharT, _Traits,
_Alloc>::operator=(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&) [with
_CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]
operator=(basic_string&& __str)
^~~~~~~~
/home/jwakely/gcc/7/include/c++/7.0.0/bits/basic_string.h:747:7: note:
candidate: std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&
std::__cxx11::basic_string<_CharT, _Traits,
_Alloc>::operator=(std::__cxx11::basic_string<_CharT, _Traits,
_Alloc>::__sv_type) [with _CharT = char; _Traits = std::char_traits<char>;
_Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits,
_Alloc>::__sv_type = std::basic_string_view<char>]
operator=(__sv_type __sv)
^~~~~~~~
