How to convert std::string to lower case?

Question

I want to convert a std::string to lowercase. I am aware of the function tolower(), however in the past I have had issues with this function and it

Answer 1

My own template functions which performs upper / lower case.

#include 
#include 

//
//  Lowercases string
//
template 
std::basic_string lowercase(const std::basic_string& s)
{
    std::basic_string s2 = s;
    std::transform(s2.begin(), s2.end(), s2.begin(), tolower);
    return std::move(s2);
}

//
// Uppercases string
//
template 
std::basic_string uppercase(const std::basic_string& s)
{
    std::basic_string s2 = s;
    std::transform(s2.begin(), s2.end(), s2.begin(), toupper);
    return std::move(s2);
}