c++シンscope_guard

#pragma once



#include <functional>



struct scope_guard {

	typedef std::function<void()> Fn;

	Fn action;

	bool active;



    scope_guard(Fn action) : action(action), active(true) {}



	void dismiss() {

		active = false;

	}

    ~scope_guard () {

		if(active) action();

    }

};

test:
 

#include <windows.h>



#include <iostream>

using namespace std;



#include "scope_guard.h"



void test() {

	void* memory = malloc(100);

	scope_guard g([&]() { 

		free(memory);

		cout << "memory freed" << endl;

	});



	bool error_occur = true;

	if(error_occur) return;



	g.dismiss();

}

int main() {

	test();

}