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quick std::vector.assign question

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Should I call std::vector::reserve() before std::vector.assign() on a new vector, or does std::vector::assign() also request storage space before assignment?

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It depends on what kind of iterators you feed it. If you feed assign() input iterators it'll add elements one at a time. With random access iterators it should know how much it'll be adding and allocate up front.

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