emplace/emplace_back replace insert/push_back for pair #1504
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emplace/emplace_back 替换掉push_back(std::make_pair(,))/insert(std::make_pair(,))
emplace的性能略好于push_back(T&&) 和 insert(T&&)
并且代码也更简洁
可以参考:
Effective modern C++ item 42: Consider emplacement instead of insertion.