什么是逗号操作呢？ [英] What does the comma operator do?

问题描述

什么是以下code用C做/ C ++？

What does the following code do in C/C++?

if (blah(), 5) {
    //do something
}

推荐答案

逗号操作者施加和值5被用于确定条件的真/假

Comma operator is applied and the value 5 is used to determine the conditional's true/false.

它将执行布拉赫（）和得到的东西回来（presumably），那么逗号运算符采用和5将是用于确定为前pression真/假值的唯一的事情

It will execute blah() and get something back (presumably), then the comma operator is employed and 5 will be the only thing that is used to determine the true/false value for the expression.

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注意，运营商可能过载的胡说（）函数（未指定）的返回类型，使结果不明显。

Note that the , operator could be overloaded for the return type of the blah() function (which wasn't specified), making the result non-obvious.

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