So if I reserve(100) first, add some elements, and then resize(0) (or any other number smaller than the current size), will the vector reallocate memory to a take less space than 100 elements?
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So if I reserve(100) first, add some elements, and then resize(0) (or any other number smaller than the current size), will the vector reallocate memory to a take less space than 100 elements?
vector<T>::resize(0)should not cause a reallocation or deletion of allocated memory, and for this reason in most cases is preferable tovector<T>::clear().For more detail see answers to this question: std::vector resize downward