char and wchar_t in template

gistfile1.cpp

#include <iostream>

template<typename CharT>
const CharT* ToString(const char* str, const wchar_t* wstr);

template<>
const char* ToString<char>(const char* str, const wchar_t* wstr)
{
  return str;
}

template<>
const wchar_t* ToString<wchar_t>(const char* str, const wchar_t* wstr)
{
  return wstr;
}

#define TOSTRING(T, str) ToString<T>(str, L##str)

int main()
{
  std::cout << ToString<char>("Hello", L"World") << std::endl;
  std::wcout << ToString<wchar_t>("Hello", L"World") << std::endl;
  std::cout << TOSTRING(char, "Who am I") << std::endl;
  std::wcout << TOSTRING(wchar_t, "Who am I") << std::endl;
}