什么是更好的方式来避免do-while（0）; hack在C ++？ [英] What are some better ways to avoid the do-while(0); hack in C++?

问题描述

代码流如下：

if(check())
{
  ...
  ...
  if(check())
  {
    ...
    ...
    if(check())
    {
      ...
      ...
    }
  }
}

我通常看到这个工作是为了避免上面的乱码流：

I have generally seen this work around to avoid the above messy code flow:

do {
    if(!check()) break;
    ...
    ...
    if(!check()) break;
    ...
    ...
    if(!check()) break;
    ...
    ...
} while(0);

什么是更好的方法，避免这种工作/ hack， （行业级）代码？

What are some better ways that avoid this work-around/hack so that it becomes a higher-level (industry level) code?

欢迎任何建议。

推荐答案

在函数中隔离这些决定并使用 return s而不是 break s。虽然所有这些检查对应于与函数相同的抽象级别，这是相当合乎逻辑的方法。

It is considered acceptable practice to isolate these decisions in a function and use returns instead of breaks. While all these checks correspond to the same level of abstraction as of the function, it is quite logical approach.

例如：

void foo(...)
{
   if (!condition)
   {
      return;
   }
   ...
   if (!other condition)
   {
      return;
   }
   ...
   if (!another condition)
   {
      return;
   }
   ... 
   if (!yet another condition)
   {
      return;
   }
   ...
   // Some unconditional stuff       
}

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