C / C ++条件return语句 [英] C/C++ conditional return statements

问题描述

我工作的嵌入式程序，在某些情况下，如果一个条件是不是意味着，我想从功能迅速恢复越好。如果我有以下的code和我做嵌入式编程：

I am working on embedded program and in certain cases if a condition is not meant, I would like to return from function as quickly as possible. if I have the following code and I am doing embedded programming:

foo() {
   if (a < b) {
       return 0;  // bail, since condition is met
   } else {
       // lots of calculations in this block
   }
   return 1;
}

我的问题是，这样做不好有多个return语句？它是不好的做法？有没有更好的方法呢？是否MISRA说什么？

My question is, is it bad having multiple return statements? Is it bad practice? Are there better methods? Does MISRA say anything about it?

请注意：这个问题特别是嵌入式系统，与MISRA做的不只是C / C ++

NOTE: This question is particular to Embedded Systems, has to do with MISRA not just C/C++

谢谢...

推荐答案

MISRA需要一个return语句：

MISRA requires a single return statement:

（MISRA，规则14.7：必填）

(MISRA, rule 14.7 : required) "A function shall have a single point of exit at the end of the function"

现在，我个人不认为这是一个很好的规则。最小化return语句的数量，但使用return语句时，它增强你的code的可读性。

Now, personally I don't think it is a good rule. Minimize the number of return statements but use a return statement when it enhances the readability of your code.

例如后卫条款可以让你的code更清洁，更具有可读性。

For example guard clauses can make your code cleaner and more readable.

我建议你阅读这篇文章了解达芬（写入code从上到下）：

I suggest you to read this article about duffing (writing code from top to bottom):

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