What does the vertical bar ( | ) mean in C++?

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

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 */
}

See also:

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