c++ 精簡版 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();}