C ++ wcout std :: map value

Question

I have a std :: map called "prompts", which is declared as follows:

std::map<const int, wstring, std::less<int>, std::allocator<std::pair<const int, std::wstring> >> prompts; 

and it stores the key and string wstring pairs. If I do this:

 wcout << prompts[interpreter->get_state()]; 

Compiler (vc10) complains

 error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'std::basic_string<_Elem,_Traits,_Ax>' (or there is no acceptable conversion) 

What do I need to do to get the wstring value returned from the map to print using wcout? Some cast? Or...?

Answer 1

The first line is missing std::

std::map<const int, std :: wstring, std::less<int>, std::allocator<std::pair<const int, std::wstring> >> prompts;

You should write std::wcout instead of wcout .

I just tried this code and compiles.

 #include <map> #include <iostream> #include <string> int main() { std::map<const int, std::wstring, std::less<int>, std::allocator<std::pair<const int, std::wstring> >> prompts; std::wcout << prompts[1]; return 0; }