C++核心準則Per.1,2,3,4 慎重地優化代碼

Per.1: Don't optimize without reason Per.1:沒有明確理由不要進行優化   Reason（原因） If there is no need for optimization, the main result of the effort will be more errors and higher maintenance costs. 如果沒有優化的需求，這種努

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