http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58713
Bug ID: 58713
Summary: error: cannot bind ‘std::ostream {aka
std::basic_ostream<char>}’ lvalue to
‘std::basic_ostream<char>&&’
Product: gcc
Version: 4.8.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: ali.baharev at gmail dot com
#include <iostream>
struct A { };
int main() {
A a;
std::cout << a;
}
-----
g++ 4.8.1, 64 bit with -std=c++11 gives the correct error message:
main.cpp:7:15: error: no match for ‘operator<<’ (operand types are
‘std::ostream {aka std::basic_ostream<char>}’ and ‘A’)
std::cout << a;
^
However, 4.8.1, 32 bit or 4.7.2, 64 bit gives:
prog.cpp:7:18: error: cannot bind ‘std::ostream {aka std::basic_ostream<char>}’
lvalue to ‘std::basic_ostream<char>&&’
std::cout << a;
^
In file included from /usr/include/c++/4.8/iostream:39:0,
from prog.cpp:1:
/usr/include/c++/4.8/ostream:602:5: error: initializing argument 1 of
‘std::basic_ostream<_CharT, _Traits>&
std::operator<<(std::basic_ostream<_CharT, _Traits>&&, const _Tp&) [with _CharT
= char; _Traits = std::char_traits<char>; _Tp = A]’
operator<<(basic_ostream<_CharT, _Traits>&& __os, const _Tp& __x)
^
Could this rather confusing error message be improved?
Why do the 32 and 64 bit versions behave differently?
