复合分配到bool安全吗？

Question

I came across code like this and it made me cringe:

bool isEventSent = false;

if(type >= EVENT_BEGIN && type < EVENT_END)
{
    isEventSent |= m_SendToSubscribers(event);
}

return isEventSent;

The intent is clear, but I've never used compound assignment with bools like that and it makes me feel uneasy. Is this code safe? And if not, what would be a case it could fail?

I know that a |= b is equivalent to a = a | b a = a | b , but I am wondering whether a | b a | b instead of a || b a || b could cause problems for booleans under some circumstances.

Answer 1

It is perfectly correct. The compound operator a |= b means a = a | b a = a | b , so isEventSent |= m_SendToSubscribers(event); means isEventSent = isEventSent | m_SendToSubscribers(event); isEventSent = isEventSent | m_SendToSubscribers(event); . Both individual operators ( = and | ) are well defined for bool s.

Answer 2

Perfectly safe. The a |= b is mostly equivalent to doing a = a | b.