一些有经验的程序员为什么要写前pressions这种方式？ [英] Why do some experienced programmers write expressions this way?

问题描述

可能显示的文件：结果
  如何检查等号？ （0 == i）或（ⅰ== 0）的结果
  <一href=\"http://stackoverflow.com/questions/271561/why-does-one-often-see-null-variable-instead-of-variable-null-in-c\">Why做一件经常看到＆ldquo;！=空可变的rdquo;的而不是＆ldquo;！变量=空＆rdquo;的在C＃中？

我已经在这里和那里以及一些DirectX的code在看看一个奇怪的教程，发现许多有经验的C ++程序员编写以下列方式前pressions：

I've been having a look at an odd tutorial here and there as well as some DirectX code and noticed that many experienced C++ programmers write expressions in the following way:

(<constant> == <variable>)

而不是什么我的传统智慧似乎preFER：

rather than what my conventional wisdom seems to prefer:

(<variable> == <constant>)

例如。 如果（NULL == PTR），而不是如果（PTR == NULL）。我preFER第二替代方案中，如果没有其他原因选择前者，我的原因是变量似乎是前pression的接收端。

E.g. if (NULL == ptr) rather than if (ptr == NULL). I prefer the second alternative, if there are no other reasons for choosing the former, my reason being that the variable seems to be the "receiving" end of the expression.

但我怀疑前者是为了避免无意中使用分配常数变量的值 = ，而不是 == 。这是正确？

But I suspect the former is used to avoid inadvertently assigning the value of the constant to the variable by using = rather than ==. Would that be correct?

推荐答案

是的，这是正确的。这是检测的错字 = ，而不是 == 。

Yes, that's correct. It's to detect the typo of = instead of ==.

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