Question

I recently saw the following in the codebase:

bool bRes = (a < b) ? a=b, true : false;

If a < b, then a=b is executed and bRes is true.
What exactly is going on here? The docs for conditional operator don’t mention anything about chaining expressions.

edit: to be clear I get the conditional operator part, it’s the a=b, true as a single expression that confused me.

Answer 1

Eww. That is a usage of the comma operator. a=b, true does precisely what you said. It executes each expression and results in the value of the last expression.