CPP: emplace_back() replaces many push_back()...to improve performance #14610
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尽可能的减少临时变量的构造以提高效率:
std::vector: 使用 emplace_back 替换 push_back, 传参满足条件的使用 std::move 或 std::forward 特性
个别函数的参数:不改变值时由传值改为传参引