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Victrid's Personal Site

斯普拉遁3打工模式联机网络过程分析 DHCP无类型静态路由──一个摆设 配置透明代理,实现无感上网 Generating Unlimited Grammar: A Messenger Perspective LaTeX插入其他PDF中的矢量图 光速不变原理和迈克尔孙──莫雷实验 交大葡萄演义 调试微信内置浏览器 欧悌甫戎篇 苏格拉底的申辩篇 LCA 最近公共祖先 弥罗斯人的辩论 埃斯库罗斯作品:波斯人、阿伽门农 电路理论资料 Coronavirus: A Humanitarian Crisis 雨夜 linux配置SSR 二叉堆的实现 懒政 Placement New Flipped: A Love Story 我宁可呆在这样的疯人院里 谈新发本地病例 勇敢与智慧 Powerful but Limited Drafted VLC Libva Error Troubleshooting Ring-Fit新上手 政治艺术化与艺术政治化 动态规划——从分割等和子集入手 被背叛的革命 (1) Everything About DPT-RP1 When Using LINUX HTTP STATUS 451 二分法——重复情形 鸽巢排序与桶排序 为什么要写博客 系统更换 动窗法与前缀和——简单实践 非类型模板参数 CodeBlocks重装 C-Style String Operation
判断的短路规则
Victrid · 2020-01-16 · via Victrid's Personal Site

所谓的判断short circuiting,是指在条件判断式中,如果前者已经满足了先决条件,就不会执行后置的表达式。例如下面这个程序:

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int x = 0;
if (false && ++x)
cout << x;
if (true || ++x)
cout << x;
cout << x;
return 0;

屏幕输出为00。这个操作不是编译时处理,而是程序运行时处理的,因此,即便是换成以下程序

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int x;
std::cin >> x;
if (x!=0 && ++x)
std::cout << x;
if (x==0 || ++x)
std::cout << x;
std::cout << x;
return 0;

当输入0时也仍然输出00。判断的实现是基于条件下的跳转,而不是编译器优化。

Author: Victrid

Permanent Link: https://victrid.dev/2020/pan-duan-de-duan-lu-gui-ze/

License: Copyright (c) 2025 victrid Terms of Use

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