[boost] [Test] Problem testing with wstring

Subject: [boost] [Test] Problem testing with wstring
From: Jared McIntyre (jmcintyre_at_[hidden])
Date: 2009-08-26 00:46:13

I'm having an issue testing against wstrings:

std::wstring testString("");
BOOST_CHECK_EQUAL(testString,L"");

This fails with the following error:

std_map.cpp: In member function ‘void  
vector_in_map_stream_test::test_method()’:
std_map.cpp:83: error: no matching function for call to  
‘std::basic_string<wchar_t, std::char_traits<wchar_t>,  
std::allocator<wchar_t> >::basic_string(const char [1])’
/usr/include/c++/4.0.0/bits/basic_string.tcc:232: note: candidates  
are: std::basic_string<_CharT, _Traits, _Alloc>::basic_string(typename  
_Alloc::size_type, _CharT, const _Alloc&) [with _CharT = wchar_t,  
_Traits = std::char_traits<wchar_t>, _Alloc = std::allocator<wchar_t>]
/usr/include/c++/4.0.0/bits/basic_string.tcc:225:  
note:                 std::basic_string<_CharT, _Traits,  
_Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT =  
wchar_t, _Traits = std::char_traits<wchar_t>, _Alloc =  
std::allocator<wchar_t>]
/usr/include/c++/4.0.0/bits/basic_string.tcc:218:  
note:                 std::basic_string<_CharT, _Traits,  
_Alloc>::basic_string(const _CharT*, typename _Alloc::size_type, const  
_Alloc&) [with _CharT = wchar_t, _Traits = std::char_traits<wchar_t>,  
_Alloc = std::allocator<wchar_t>]
/usr/include/c++/4.0.0/bits/basic_string.tcc:207:  
note:                 std::basic_string<_CharT, _Traits,  
_Alloc>::basic_string(const std::basic_string<_CharT, _Traits,  
_Alloc>&, typename _Alloc::size_type, typename _Alloc::size_type,  
const _Alloc&) [with _CharT = wchar_t, _Traits =  
std::char_traits<wchar_t>, _Alloc = std::allocator<wchar_t>]
/usr/include/c++/4.0.0/bits/basic_string.tcc:196:  
note:                 std::basic_string<_CharT, _Traits,  
_Alloc>::basic_string(const std::basic_string<_CharT, _Traits,  
_Alloc>&, typename _Alloc::size_type, typename _Alloc::size_type)  
[with _CharT = wchar_t, _Traits = std::char_traits<wchar_t>, _Alloc =  
std::allocator<wchar_t>]
/usr/include/c++/4.0.0/bits/basic_string.tcc:182:  
note:                 std::basic_string<_CharT, _Traits,  
_Alloc>::basic_string(const std::basic_string<_CharT, _Traits,  
_Alloc>&) [with _CharT = wchar_t, _Traits = std::char_traits<wchar_t>,  
_Alloc = std::allocator<wchar_t>]
/usr/include/c++/4.0.0/bits/basic_string.tcc:190:  
note:                 std::basic_string<_CharT, _Traits,  
_Alloc>::basic_string(const _Alloc&) [with _CharT = wchar_t, _Traits =  
std::char_traits<wchar_t>, _Alloc = std::allocator<wchar_t>]
/usr/include/c++/4.0.0/bits/basic_string.h:2027: note:                  
std::basic_string<_CharT, _Traits, _Alloc>::basic_string() [with  
_CharT = wchar_t, _Traits = std::char_traits<wchar_t>, _Alloc =  
std::allocator<wchar_t>]
/Users/jared/Source/boost_nobak/boost_1_39_0/boost/test/ 
test_tools.hpp: In member function ‘void  
boost::test_tools::print_log_value<T>::operator()(std::ostream&, const  
T&) [with T = std::basic_string<wchar_t, std::char_traits<wchar_t>,  
std::allocator<wchar_t> >]’:
/Users/jared/Source/boost_nobak/boost_1_39_0/boost/test/test_tools.hpp: 
467:   instantiated from ‘std::ostream&  
boost::test_tools::tt_detail::operator<<(std::ostream&, const  
boost::test_tools::tt_detail::print_helper_t<T>&) [with T =  
std::basic_string<wchar_t, std::char_traits<wchar_t>,  
std::allocator<wchar_t> >]’
/Users/jared/Source/boost_nobak/boost_1_39_0/boost/test/utils/ 
lazy_ostream.hpp:74:   instantiated from ‘std::ostream&  
boost::unit_test::lazy_ostream_impl<T>::operator()(std::ostream&)  
const [with T = const  
boost 
::test_tools::tt_detail::print_helper_t<std::basic_string<wchar_t,  
std::char_traits<wchar_t>, std::allocator<wchar_t> > >&]’
std_map.cpp:110:   instantiated from here
/Users/jared/Source/boost_nobak/boost_1_39_0/boost/test/test_tools.hpp: 
326: error: no match for ‘operator<<’ in ‘ostr << t’
/usr/include/c++/4.0.0/bits/ostream.tcc:67: note: candidates are:  
std::basic_ostream<CharT1, Tr>& std::basic_ostream<_CharT,  
_Traits>::operator<<(std::basic_ostream<_CharT, _Traits>& (*) 
(std::basic_ostream<_CharT, _Traits>&)) [with _CharT = char, _Traits =  
std::char_traits<char>]
/usr/include/c++/4.0.0/bits/ostream.tcc:78: note:                  
std::basic_ostream<CharT1, Tr>& std::basic_ostream<_CharT,  
_Traits>::operator<<(std::basic_ios<_CharT, _Traits>& (*) 
(std::basic_ios<_CharT, _Traits>&)) [with _CharT = char, _Traits =  
std::char_traits<char>]
/usr/include/c++/4.0.0/bits/ostream.tcc:90: note:                  
std::basic_ostream<CharT1, Tr>& std::basic_ostream<_CharT,  
_Traits>::operator<<(std::ios_base& (*)(std::ios_base&)) [with _CharT  
= char, _Traits = std::char_traits<char>]
/usr/include/c++/4.0.0/bits/ostream.tcc:125: note:                  
std::basic_ostream<CharT1, Tr>& std::basic_ostream<_CharT,  
_Traits>::operator<<(long int) [with _CharT = char, _Traits =  
std::char_traits<char>]
/usr/include/c++/4.0.0/bits/ostream.tcc:159: note:                  
std::basic_ostream<CharT1, Tr>& std::basic_ostream<_CharT,  
_Traits>::operator<<(long unsigned int) [with _CharT = char, _Traits =  
std::char_traits<char>]
/usr/include/c++/4.0.0/bits/ostream.tcc:102: note:                  
std::basic_ostream<CharT1, Tr>& std::basic_ostream<_CharT,  
_Traits>::operator<<(bool) [with _CharT = char, _Traits =  
std::char_traits<char>]
/usr/include/c++/4.0.0/ostream:176: 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++/4.0.0/ostream:187: note:                  
std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT,  
_Traits>::operator<<(short unsigned int) [with _CharT = char, _Traits  
= std::char_traits<char>]
/usr/include/c++/4.0.0/ostream:191: note:                  
std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT,  
_Traits>::operator<<(int) [with _CharT = char, _Traits =  
std::char_traits<char>]
/usr/include/c++/4.0.0/ostream:202: note:                  
std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT,  
_Traits>::operator<<(unsigned int) [with _CharT = char, _Traits =  
std::char_traits<char>]
/usr/include/c++/4.0.0/bits/ostream.tcc:183: note:                  
std::basic_ostream<CharT1, Tr>& std::basic_ostream<_CharT,  
_Traits>::operator<<(long long int) [with _CharT = char, _Traits =  
std::char_traits<char>]
/usr/include/c++/4.0.0/bits/ostream.tcc:218: note:                  
std::basic_ostream<CharT1, Tr>& std::basic_ostream<_CharT,  
_Traits>::operator<<(long long unsigned int) [with _CharT = char,  
_Traits = std::char_traits<char>]
/usr/include/c++/4.0.0/bits/ostream.tcc:242: note:                  
std::basic_ostream<CharT1, Tr>& std::basic_ostream<_CharT,  
_Traits>::operator<<(double) [with _CharT = char, _Traits =  
std::char_traits<char>]
/usr/include/c++/4.0.0/ostream:217: note:                  
std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT,  
_Traits>::operator<<(float) [with _CharT = char, _Traits =  
std::char_traits<char>]
/usr/include/c++/4.0.0/bits/ostream.tcc:265: note:                  
std::basic_ostream<CharT1, Tr>& std::basic_ostream<_CharT,  
_Traits>::operator<<(long double) [with _CharT = char, _Traits =  
std::char_traits<char>]
/usr/include/c++/4.0.0/bits/ostream.tcc:288: note:                  
std::basic_ostream<CharT1, Tr>& std::basic_ostream<_CharT,  
_Traits>::operator<<(const void*) [with _CharT = char, _Traits =  
std::char_traits<char>]
/usr/include/c++/4.0.0/bits/ostream.tcc:311: note:                  
std::basic_ostream<CharT1, Tr>& std::basic_ostream<_CharT,  
_Traits>::operator<<(std::basic_streambuf<_CharT, _Traits>*) [with  
_CharT = char, _Traits = std::char_traits<char>]

Is this something that can be worked around without having to convert  
the string to char?

Thanks,

Jared