c++: Operations order in for loop increment part

Question

Consider the following piece of code:

int totalLength = 0;
int partLength = 0;
for(; totalLength < SOME_CONST; totalLength += partLength, partLength = 0)
{
    //partLength may be increased here
}

In this particular case, can I assume that partLength will be set to 0 AFTER it will be added to totalLength (so if partLength will be increased in the loop body, I won't be adding 0 to totalLength at the end of the loop)? I read about c++ sequences and such, but didn't find any clear answer.

Weak to Enuma Elish · Accepted Answer · 2016-03-04 18:27:49Z

5

Yes. The left hand side of the comma operator is sequenced before the right hand side. totalLength += partLength will be fully evaluated before it performs partLength = 0.

answered Mar 4, 2016 at 18:27

Weak to Enuma Elish

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2 Comments

PookyFan Over a year ago

So it isn't implementation dependent? I was afraid it is, thus that question.

Weak to Enuma Elish Over a year ago

@PookyFan It isn't. You can read more about it here, too.

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