Compatibility.h

/*
File:  Compatibility.h

Description: Compatibility Header File

Authors:
Kostas Vardis

This is a free engine. If you use this code as is or any part of it in any kind of project or product, please
acknowledge the source and its author(s).
*/

#ifndef COMPATIBILITY_H
#define COMPATIBILITY_H

// source: https://isocpp.org/files/papers/N3656.txt
#include <cstddef>
#include <memory>
#include <type_traits>
#include <utility>
namespace std {
    template<class T> struct _Unique_if {
        typedef unique_ptr<T> _Single_object;
    };

    template<class T> struct _Unique_if<T[]> {
        typedef unique_ptr<T[]> _Unknown_bound;
    };

    template<class T, size_t N> struct _Unique_if<T[N]> {
        typedef void _Known_bound;
    };

    template<class T, class... Args>
    typename _Unique_if<T>::_Single_object
        make_unique(Args&&... args) {
        return unique_ptr<T>(new T(std::forward<Args>(args)...));
    }

    template<class T>
    typename _Unique_if<T>::_Unknown_bound
        make_unique(size_t n) {
        typedef typename remove_extent<T>::type U;
        return unique_ptr<T>(new U[n]());
    }

    template<class T, class... Args>
    typename _Unique_if<T>::_Known_bound
        make_unique(Args&&...) = delete;
}
#endif // COMPATIBILITY_H