Ternary operator and increment operator

问题

Is this a valid / sound way of resetting a counter if a condition is not met? It is the most compact way I could think of.

int counter = 0;
int a,b;

// Do .. and assign a and b 

counter = ((a<b) ? counter++ : 0); 

回答1:

You are already assigning to counter, so don't use ++ as well.

counter = condition ? (counter + 1) : 0;

回答2:

The behaviour of counter = (condition ? counter++ : 0); is undefined as there's no sequencing point. (The ternary is not sequenced, and neither is assignment).

It's similar in form to i = i++;

来源：https://stackoverflow.com/questions/32208229/ternary-operator-and-increment-operator