gununu

#include "sign_cast.hpp"

int main() {
    char* a = 0;
    unsigned char* x = sign_cast<unsigned char*>(a); //ok
    sign_cast<char*>(a);         //ok
    sign_cast<signed char*>(a);  //ok
    //sign_cast<wchar_t*>(a);    //error
    sign_cast<const char*>(a); //ok
    sign_cast<char*const>(a);  //ok

gununu

Please refer new C++14 static_if library

https://github.com/gununu/static_if

gununu

/*
    Use, modification and distribution are subject to the Boost Software License,
    Version 1.0. (http://www.boost.org/LICENSE_1_0.txt).
*/

#ifndef GUNUNU_GIL_PREVIEW_HPP
#define GUNUNU_GIL_PREVIEW_HPP

#include <windows.h>
#pragma comment(lib, "user32")