C++类型双关

Posted 2021-06-17 放飞梦想C

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#include<iostream>

struct Entity
{
	int x, y;
	int* GetPtr()
	{
		return &x;
	}
	/*Entity* GetPtr()
	{
		return this;
	}*/
};

int main()
{
	Entity e = { 1,2 };
	int* ptr = (int*)&e;

	int x = *(int*)((char*)&e);
	int y = *(int*)((char*)&e + 4);

	std::cout << x << " " << y << " " << ptr[0] << " " << ptr[1] << std::endl;
	//	1 2 1 2
	ptr = e.GetPtr();
	//ptr = (int*)e.GetPtr();
	ptr[0] = 4;
	ptr[1] = 5;

	std::cout << ptr[0] << " " << ptr[1] << std::endl;
	// 4 5
	std::cin.get();
}