http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50462
Bug #: 50462
Summary: Particularly painful error message
Classification: Unclassified
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: minor
Priority: P3
Component: c++
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: ch...@bubblescope.net
The following code (note that the call to 'size' is missing () ) produces a
particulaly painful error message:
#include <iostream>
struct V
{
int size() {};
int size() const {};
};
void print(V v)
{ std::cout << v.size; }
Error message:
t.cc: In function ‘void print(V)’:
t.cc:10:18: error: no match for ‘operator<<’ in ‘std::cout << v.V::size’
t.cc:10:18: note: candidates are:
/usr/include/c++/4.6/ostream:110:7: note: std::basic_ostream<_CharT,
_Traits>::__ostream_type& std::basic_ostream<_CharT,
_Traits>::operator<<(std::basic_ostream<_CharT, _Traits>::__ostream_type&
(*)(std::basic_ostream<_CharT, _Traits>::__ostream_type&)) [with _CharT = char,
_Traits = std::char_traits<char>, std::basic_ostream<_CharT,
_Traits>::__ostream_type = std::basic_ostream<char>]
/usr/include/c++/4.6/ostream:110:7: note: no known conversion for argument 1
from ‘<unresolved overloaded function type>’ to
‘std::basic_ostream<char>::__ostream_type&
(*)(std::basic_ostream<char>::__ostream_type&)’
/usr/include/c++/4.6/ostream:119:7: note: std::basic_ostream<_CharT,
_Traits>::__ostream_type& std::basic_ostream<_CharT,
_Traits>::operator<<(std::basic_ostream<_CharT, _Traits>::__ios_type&
(*)(std::basic_ostream<_CharT, _Traits>::__ios_type&)) [with _CharT = char,
_Traits = std::char_traits<char>, std::basic_ostream<_CharT,
_Traits>::__ostream_type = std::basic_ostream<char>, std::basic_ostream<_CharT,
_Traits>::__ios_type = std::basic_ios<char>]
/usr/include/c++/4.6/ostream:119:7: note: no known conversion for argument 1
from ‘<unresolved overloaded function type>’ to
‘std::basic_ostream<char>::__ios_type&
(*)(std::basic_ostream<char>::__ios_type&)’
/usr/include/c++/4.6/ostream:129:7: note: std::basic_ostream<_CharT,
_Traits>::__ostream_type& std::basic_ostream<_CharT,
_Traits>::operator<<(std::ios_base& (*)(std::ios_base&)) [with _CharT = char,
_Traits = std::char_traits<char>, std::basic_ostream<_CharT,
_Traits>::__ostream_type = std::basic_ostream<char>]
/usr/include/c++/4.6/ostream:129:7: note: no known conversion for argument 1
from ‘<unresolved overloaded function type>’ to ‘std::ios_base&
(*)(std::ios_base&)’
/usr/include/c++/4.6/ostream:167:7: note: std::basic_ostream<_CharT,
_Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long
int) [with _CharT = char, _Traits = std::char_traits<char>,
std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
/usr/include/c++/4.6/ostream:167:7: note: no known conversion for argument 1
from ‘<unresolved overloaded function type>’ to ‘long int’
/usr/include/c++/4.6/ostream:171:7: note: std::basic_ostream<_CharT,
_Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long
unsigned int) [with _CharT = char, _Traits = std::char_traits<char>,
std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
/usr/include/c++/4.6/ostream:171:7: note: no known conversion for argument 1
from ‘<unresolved overloaded function type>’ to ‘long unsigned int’
/usr/include/c++/4.6/ostream:175:7: note: std::basic_ostream<_CharT,
_Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(bool)
[with _CharT = char, _Traits = std::char_traits<char>,
std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
/usr/include/c++/4.6/ostream:175:7: note: no known conversion for argument 1
from ‘<unresolved overloaded function type>’ to ‘bool’
/usr/include/c++/4.6/bits/ostream.tcc:93:5: note: std::basic_ostream<_CharT,
_Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(short int) [with
_CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.6/bits/ostream.tcc:93:5: note: no known conversion for
argument 1 from ‘<unresolved overloaded function type>’ to ‘short int’
/usr/include/c++/4.6/ostream:182:7: note: std::basic_ostream<_CharT,
_Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(short
unsigned int) [with _CharT = char, _Traits = std::char_traits<char>,
std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
/usr/include/c++/4.6/ostream:182:7: note: no known conversion for argument 1
from ‘<unresolved overloaded function type>’ to ‘short unsigned int’
/usr/include/c++/4.6/bits/ostream.tcc:107:5: note: std::basic_ostream<_CharT,
_Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(int) [with _CharT =
char, _Traits = std::char_traits<char>]
/usr/include/c++/4.6/bits/ostream.tcc:107:5: note: no known conversion for
argument 1 from ‘<unresolved overloaded function type>’ to ‘int’
/usr/include/c++/4.6/ostream:193:7: note: std::basic_ostream<_CharT,
_Traits>::__ostream_type& std::basic_ostream<_CharT,
_Traits>::operator<<(unsigned int) [with _CharT = char, _Traits =
std::char_traits<char>, std::basic_ostream<_CharT, _Traits>::__ostream_type =
std::basic_ostream<char>]
/usr/include/c++/4.6/ostream:193:7: note: no known conversion for argument 1
from ‘<unresolved overloaded function type>’ to ‘unsigned int’
/usr/include/c++/4.6/ostream:202:7: note: std::basic_ostream<_CharT,
_Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long
long int) [with _CharT = char, _Traits = std::char_traits<char>,
std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
/usr/include/c++/4.6/ostream:202:7: note: no known conversion for argument 1
from ‘<unresolved overloaded function type>’ to ‘long long int’
/usr/include/c++/4.6/ostream:206:7: note: std::basic_ostream<_CharT,
_Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long
long unsigned int) [with _CharT = char, _Traits = std::char_traits<char>,
std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
/usr/include/c++/4.6/ostream:206:7: note: no known conversion for argument 1
from ‘<unresolved overloaded function type>’ to ‘long long unsigned int’
/usr/include/c++/4.6/ostream:211:7: note: std::basic_ostream<_CharT,
_Traits>::__ostream_type& std::basic_ostream<_CharT,
_Traits>::operator<<(double) [with _CharT = char, _Traits =
std::char_traits<char>, std::basic_ostream<_CharT, _Traits>::__ostream_type =
std::basic_ostream<char>]
/usr/include/c++/4.6/ostream:211:7: note: no known conversion for argument 1
from ‘<unresolved overloaded function type>’ to ‘double’
/usr/include/c++/4.6/ostream:215:7: note: std::basic_ostream<_CharT,
_Traits>::__ostream_type& std::basic_ostream<_CharT,
_Traits>::operator<<(float) [with _CharT = char, _Traits =
std::char_traits<char>, std::basic_ostream<_CharT, _Traits>::__ostream_type =
std::basic_ostream<char>]
/usr/include/c++/4.6/ostream:215:7: note: no known conversion for argument 1
from ‘<unresolved overloaded function type>’ to ‘float’
/usr/include/c++/4.6/ostream:223:7: note: std::basic_ostream<_CharT,
_Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long
double) [with _CharT = char, _Traits = std::char_traits<char>,
std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
/usr/include/c++/4.6/ostream:223:7: note: no known conversion for argument 1
from ‘<unresolved overloaded function type>’ to ‘long double’
/usr/include/c++/4.6/ostream:227:7: note: std::basic_ostream<_CharT,
_Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(const
void*) [with _CharT = char, _Traits = std::char_traits<char>,
std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
/usr/include/c++/4.6/ostream:227:7: note: no known conversion for argument 1
from ‘<unresolved overloaded function type>’ to ‘const void*’
/usr/include/c++/4.6/bits/ostream.tcc:121:5: note: std::basic_ostream<_CharT,
_Traits>& std::basic_ostream<_CharT,
_Traits>::operator<<(std::basic_ostream<_CharT, _Traits>::__streambuf_type*)
[with _CharT = char, _Traits = std::char_traits<char>,
std::basic_ostream<_CharT, _Traits>::__streambuf_type =
std::basic_streambuf<char>]
/usr/include/c++/4.6/bits/ostream.tcc:121:5: note: no known conversion for
argument 1 from ‘<unresolved overloaded function type>’ to
‘std::basic_ostream<char>::__streambuf_type*’
/usr/include/c++/4.6/ostream:528:77: note: template<class _Traits>
std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char,
_Traits>&, const unsigned char*)
/usr/include/c++/4.6/ostream:523:75: note: template<class _Traits>
std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char,
_Traits>&, const signed char*)
/usr/include/c++/4.6/ostream:510:68: note: template<class _Traits>
std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char,
_Traits>&, const char*)
/usr/include/c++/4.6/bits/ostream.tcc:323:70: note: template<class _CharT,
class _Traits> std::basic_ostream<_CharT, _Traits>&
std::operator<<(std::basic_ostream<_CharT, _Traits>&, const char*)
/usr/include/c++/4.6/ostream:493:72: note: template<class _CharT, class
_Traits> std::basic_ostream<_CharT, _Traits>&
std::operator<<(std::basic_ostream<_CharT, _Traits>&, const _CharT*)
/usr/include/c++/4.6/ostream:473:70: note: template<class _Traits>
std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char,
_Traits>&, unsigned char)
/usr/include/c++/4.6/ostream:468:68: note: template<class _Traits>
std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char,
_Traits>&, signed char)
/usr/include/c++/4.6/ostream:462:61: note: template<class _Traits>
std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char,
_Traits>&, char)
/usr/include/c++/4.6/ostream:456:63: note: template<class _CharT, class
_Traits> std::basic_ostream<_CharT, _Traits>&
std::operator<<(std::basic_ostream<_CharT, _Traits>&, char)
/usr/include/c++/4.6/ostream:451:65: note: template<class _CharT, class
_Traits> std::basic_ostream<_CharT, _Traits>&
std::operator<<(std::basic_ostream<_CharT, _Traits>&, _CharT)
/usr/include/c++/4.6/bits/basic_string.h:2694:59: note: template<class _CharT,
class _Traits, class _Alloc> std::basic_ostream<_CharT, _Traits>&
std::operator<<(std::basic_ostream<_CharT, _Traits>&, const
std::basic_string<_CharT, _Traits, _Alloc>&)
caj@nyanko:~/temp$
