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Does std::vector::size() recompute the size of the vector each time it’s called, or does it maintain a counter that is only modified when the vector is modified? For example, if I have class with a std::vector<double> member, would there be any speed benefit to keeping track of its size in a separate counter?
size()is guaranteed to have constant time complexity, and in any sane implementation will be as fast an operation as you can possibly have.