垂直管道(|)在C ++中是什么意思? [英] What does the vertical pipe ( | ) mean in C++?

问题描述

我的一本编程书籍中都包含以下C ++代码:

I have this C++ code in one of my programming books:

WNDCLASSEX wndClass = { 0 };
wndClass.cbSize = sizeof(WNDCLASSEX);
wndClass.style =  CS_HREDRAW | CS_VREDRAW;

在C ++ Windows编程中，单个管道有什么作用?

What does the single pipe do in C++ windows programming?

推荐答案

按位或运算符.它将设置所有提供的两个值中都为真的所有位为真.

Bitwise OR operator. It will set all bits true that are true in either of both values provided.

例如，CS_HREDRAW可以为1，CS_VREDRAW可以为2.然后使用按位AND运算符&来检查它们是否设置非常简单:

For example CS_HREDRAW could be 1 and CS_VREDRAW could be 2. Then it's very simple to check if they are set by using the bitwise AND operator &:

#define CS_HREDRAW 1
#define CS_VREDRAW 2
#define CS_ANOTHERSTYLE 4

unsigned int style = CS_HREDRAW | CS_VREDRAW;
if(style & CS_HREDRAW){
    /* CS_HREDRAW set */
}

if(style & CS_VREDRAW){
    /* CS_VREDRAW set */
}

if(style & CS_ANOTHERSTYLE){
    /* CS_ANOTHERSTYLE set */
}

另请参阅:

• 维基百科:按位操作(或)(或)
• 维基百科:掩码(计算)部分(常见的位掩码功能)

• Wikipedia: Bitwise operation (Section OR)
• Wikipedia: Mask (computing) Section( Common bitmask functions)

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