CreationPolicy.h

// Copyright(c) 2019 - 2020, #Momo
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// modification, are permitted provided that the following conditions are met :
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// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
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#pragma once

#include <memory>

// Andrei's Alexandrescu SingletonHolder (see "Modern C++ Design" ch. 6)

namespace MxEngine
{
    template<typename T>
    class CreateWithNew
    {
    public:
        static inline T* Create()
        {
            return new T();
        }

        static inline void Destroy(T* obj)
        {
            delete obj;
        }
    };

    template<typename T>
    class CreateWithMalloc
    {
    public:
        static inline T* Create()
        {
            T* ptr = std::malloc(sizeof(T));
            if (ptr == nullptr) 
                return nullptr;
            return new(ptr) T();
        }

        static inline void Destroy(T* obj)
        {
            obj->~T();
            std::free(obj);
        }
    };

    template<typename T>
    class CreateStatic
    {
        union MaxAling { char t[sizeof(T)]; long double ld; long long ll; };
    public:
        static inline T* Create()
        {
            static MaxAling staticMemory;
            return new(&staticMemory) T();
        }

        static inline void Destroy(T* obj)
        {
            obj->~T();
        }
    };
}