Question

Why this doesn’t compile on gcc?

#include <iostream>
#include <string>
 
int main() {
 
    double f = 23.43;    
    std::wstring f_str = std::to_wstring(f);
    std::wcout << f_str << std::endl;
 
    return 0;
}

The error:

prog.cpp: In function ‘int main()’:

prog.cpp:6:26: error: ‘to_wstring’ is not a member of ‘std’

example

Answer 1

std::to_wstring() was added in C++11. The link in your answer, on ideone, is not using the C++11 compiler:

language: C++ (gcc-4.7.2)

It compiles fine: http://ideone.com/UO2FQM :

language: C++0x (gcc-4.7.2)