std::transform() and toupper(), no matching function

Question

I tried the code from this question C++ std::transform() and toupper() ..why does this fail?

#include 
#include 

int main()         


        

Answer 1

std::transform(s.begin(), s.end(), s.begin(), 
std::bind(&std::toupper, std::placeholders::_1, std::locale()));

If you use vc toolchain,please include locale