What is &= and |=

Question

I was going through some VC++ code in a large code-base and came across this:

    if (nState & TOOL_TIPS_VISIBLE)
        nState &= ~TOOL_TIPS_VISI         


        

Answer 1

& and | are similar to && and ||, only they works in bitwise fashion. So now you could imagine &= and |= works similar to +=. That is x &= y; ==> x = x & y;