TSdlAnyInstance.h

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#pragma once
 
#include "SDL/sdl_fwd.h"
 
#include <variant>
#include <type_traits>
 
namespace ph
{
 
template<bool IS_CONST>
class TSdlAnyInstance
{
public:
    TSdlAnyInstance();
 
    TSdlAnyInstance(std::nullptr_t target);
 
    template<typename T>
    TSdlAnyInstance(T* target);
 
    template<typename T>
    auto* get() const;
 
    const SdlClass* getClass() const;
    const SdlStruct* getStruct() const;
    const SdlFunction* getFunction() const;
 
    bool isClass() const;
    bool isStruct() const;
    bool isFunction() const;
 
    const ISdlInstantiable* getInstantiable() const;
 
    operator bool () const;
 
private:
    using ClassInstanceType = std::conditional_t<IS_CONST, const ISdlResource, ISdlResource>;
    using StructInstanceType = std::conditional_t<IS_CONST, const void, void>;
 
    using InstanceType = std::variant<
        std::monostate, 
        ClassInstanceType*, 
        StructInstanceType*>;
 
    using MetaType = std::variant<
        std::monostate,
        const SdlClass*,
        const SdlStruct*,
        const SdlFunction*>;
 
    InstanceType m_instance;
    MetaType m_meta;
};
 
}// end namespace ph
 
#include "SDL/TSdlAnyInstance.ipp"