在 C++ 中最小化变量的范围 [英] Minimalizing variable's scope in C++

问题描述

我现在编程有一段时间了，我已经开始尝试改进我的代码.由于我真的很讨厌创建大量在长函数中只使用一次的变量，因此使用方括号缩短变量范围是一种好习惯吗?IE.而是写作:

I am programming for a while now and I've started trying to improve my code. Since I really hate creating bazillion of variables that are used only once in long function, is it good practice to shorten variable scope by using brackets? i.e. instead writing:

void fcn()
{
  int var1;
  // some part of fcn
  // use of var1;
  // rest of fcn
}

写:

void fcn()
{
  // some part of fcn
  {
    int var1;
    // use of var100;
  }
  // rest of fcn
}

推荐答案

是的，尽可能缩小变量范围确实是个好主意.

Yes it is indeed a good idea to keep the scope of variables as tight as possible.

在您的情况下，除非您绝对确定您使用 var1 的代码只会在 fcn 中使用(如果我的经验有任何意义，我往往会误判)，您可以将该代码拆分为单独的函数.你的程序会以这种方式更好地扩展，测试也会更简单.否则，像现在一样使用范围块.

In your case, unless you are absolutely certain that your code using var1 will only ever be used in fcn (and if my experience is anything to go by, I tend to misjudge that), you could split that code out to a separate function. Your program will scale better that way, and testing will also be simpler. Else, use scope blocks as you currently do.

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