Is it expensive to compute vector size in for loops, each iteration?

Question

Does the c++ compiler take care of cases like, buildings is vector:

for (int i = 0; i < buildings.size(); i++) {}

that is, does it notice if

Answer 1

I write loops like this:

for (int i = 0, maxI = buildings.size(); i < maxI; ++i)

Takes care of many issues at once: suggest max is fixed up front, no more thinking about lost performance, consolidate types. If evaluation is in the middle expression it suggests the loop changes the collection size.

Too bad language does not allow sensible use of const, else it would be const maxI.

OTOH for more and more cases I rather use some algo, lambda even allows to make it look almost like traditional code.