std::string to std::wstring and back again

I was using this code for Windows development but found that winrt::to_hstring handled the cases I needed. This code may still be useful for Win32API development using functions like CreateFileW or SendMessageW.

#include <string>
#include <locale>
#include <codecvt>

std::string strutils_wstring_to_string(const std::wstring & input) {
    using convert_typeX = std::codecvt_utf8<wchar_t>;
    std::wstring_convert<convert_typeX, wchar_t> converterX;
    return converterX.to_bytes(input);
}

std::wstring strutils_string_to_wstring(const std::string & input) {
    using convert_typeX = std::codecvt_utf8<wchar_t>;
    std::wstring_convert<convert_typeX, wchar_t> converterX;
    return converterX.from_bytes(input);
}