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Actually, reserve IS allocate, but it is not initialization. Look up allocator<char> from <memory>. It's equivalent to using allocator<char>::allocate and then using the memory spot without having used allocator<char>::construct first.
- TheRightAnswer November 19, 2013By the way, Stroustrup (creator of C++) recommends never using reserve for speed. He says he has never seen it help, and he only uses it on the very rare occasion when he wants to guarantee iterator validity.
If you use s.resize(100) the code will work fine.