C++ : Why does vector::push_back and emplace_back call value_type::constructor twice?

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C++ : Why does vector::push_back and emplace_back call value_type::constructor twice?
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C++ : Why does vector::push_back and emplace_back call value_type::constructor twice?
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vector::push_back C++ call emplace_back value_type::constructor : and twice? does Why



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