C + + Learning -- about code performance optimization

Related performance optimization ：

Optimization at the container level ：
Use emplace Instead of insert
Use emplace_back() Instead of push_back() （http://c.biancheng.net/view/6826.html）
emplace_back() and push_back() The difference between , The difference lies in the mechanism of the underlying implementation .push_back() When you add elements to the end of the container , This element will be created first , Then copy or move the element into the container （ If it's a copy , After that, it will destroy the previously created element ）; and emplace_back() At the time of implementation , The element is created directly at the end of the container , It eliminates the process of copying or moving elements .

About performance optimization ：
C++ performance optimization （ Two ）——C++ The object model
https://blog.51cto.com/u_9291927/2388807
C++ Speed optimization of https://blog.csdn.net/tktp_ht/article/details/84386614