如何避免＆QUOT;若＆QUOT;链？ [英] How to avoid "if" chains?

问题描述

假设我有这样的伪code：

Assuming I have this pseudo-code:

bool conditionA = executeStepA();
if (conditionA){
    bool conditionB = executeStepB();
    if (conditionB){
        bool conditionC = executeStepC();
        if (conditionC){
            ...
        }
    }
}

executeThisFunctionInAnyCase();

功能 executeStepX 应当且仅当在previous成功执行。
在任何情况下， executeThisFunctionInAnyCase 函数应该在年底被调用。
我在编程的新手，对于非常基本的问题，很抱歉：有没有办法（在C / C ++为例），以避免长如果链产生那种code的金字塔，在code易读性为代价？

Functions executeStepX should be executed if and only if the previous succeed. In any case, the executeThisFunctionInAnyCase function should be called at the end. I'm a newbie in programming, so sorry for the very basic question: is there a way (in C/C++ for example) to avoid that long if chain producing that sort of "pyramid of code", at the expense of the code legibility?

我知道，如果我们能跳过 executeThisFunctionInAnyCase 函数调用时，code可以简化为：

I know that if we could skip the executeThisFunctionInAnyCase function call, the code could be simplified as:

bool conditionA = executeStepA();
if (!conditionA) return;
bool conditionB = executeStepB();
if (!conditionB) return;
bool conditionC = executeStepC();
if (!conditionC) return;

但限制是 executeThisFunctionInAnyCase 函数调用。
可以在破语句以某种方式使用吗？

But the constraint is the executeThisFunctionInAnyCase function call. Could the break statement be used in some way?

推荐答案

您可以使用＆放大器;＆安培; （逻辑与）：

You can use an && (logic AND):

if (executeStepA() && executeStepB() && executeStepC()){
    ...
}
executeThisFunctionInAnyCase();

这将满足您的两个要求：

this will satisfy both of your requirements:

• executeStep＆LT; X＆GT;（）应评估只有previous 1成功（这就是所谓的 短路评价的）


• executeThisFunctionInAnyCase（）将在任何情况下要执行

• executeStep<X>() should evaluate only if the previous one succeeded (this is called short circuit evaluation)
• executeThisFunctionInAnyCase() will be executed in any case

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