Why does std::vector require its elements to be assignable?
Perhaps it's just too early in the morning for me to think straight, but... I can't think of a reason why std::vector would need its elements to be assignable.
The only operation I can think of that would require the elements to be assignable is the vector's own assignment operator, but why would an operation like push_back() require invoking the assignment operator of its elements? Even in the case of a reallocation, can't the vector use placement new to copy-construct the new elements from the old ones?
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