Something

test.cpp: In function ‘int main()’:
test.cpp:13: error: ambiguous overload for ‘operator>>’ in ‘std::basic_istringstream<char, std::char_traits<char>, std::allocator<char> >(((const std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)(& std::basic_string<char, std::char_traits<char>, std::allocator<char> >(((const char*)"C D E"), ((const std::allocator<char>&)((const std::allocator<char>*)(& std::allocator<char>())))))), _S_in) >> c’
/usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/istream:131: note: candidates are: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(std::basic_istream<_CharT, _Traits>& (*)(std::basic_istream<_CharT, _Traits>&)) [with _CharT = char, _Traits = std::char_traits<char>] <near match>
/usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/istream:134: note:                 std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(std::basic_ios<_CharT, _Traits>& (*)(std::basic_ios<_CharT, _Traits>&)) [with _CharT = char, _Traits = std::char_traits<char>] <near match>
/usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/istream:137: note:                 std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(std::ios_base& (*)(std::ios_base&)) [with _CharT = char, _Traits = std::char_traits<char>] <near match>
/usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/istream:230: note:                 std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(std::basic_streambuf<_CharT, _Traits>*) [with _CharT = char, _Traits = std::char_traits<char>] <near match>