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//
// Created by LCBHSStudent on 2020/2/25.
//

#ifndef SLOT_SIGNAL_BASE_FUNCTION_H
#define SLOT_SIGNAL_BASE_FUNCTION_H

#include 
#include 

//namespace van {
     

constexpr int FUNCID    = 0;
constexpr int FUNCADDR  = 1;

using Delegate_Key = std::array<uintptr_t, 2>;

// 前向声明
template <typename RT> class Function;
// 为了实现Function< returnType (paraType1, paraType2...)> 类的声明
template <typename RT, typename... Args>
class Function<RT(Args...)> {
     
// 定义函数指针类型
	using funcP = RT(*)(void*, Args&&...);

	static inline Function
	bind(Delegate_Key const& delegate_key) {
     
		return {
     
			reinterpret_cast<void*>(delegate_key[FUNCID]),
			reinterpret_cast<funcP>(delegate_key[FUNCADDR])
		};
	}

public:
	Function() = default;
	void* const instance_pointer = nullptr;
	funcP const function_pointer = nullptr;

	template<auto fun_ptr>
	static inline Function bind() {
     

	}
	// 调用函数
	inline RT operator() (Args... args) {
     
		return
		(*function_pointer)    // 保留参数的左右值属性
		    (instance_pointer, std::forward<Args>(args)...);
	}

	inline explicit operator Delegate_Key() const {
     
		return {
     
			reinterpret_cast<std::uintptr_t>(instance_pointer),
			reinterpret_cast<std::uintptr_t>(function_pointer)
		};
	}
};


//}

#endif //SLOT_SIGNAL_BASE_FUNCTION_H