什麼是三法則？ - What is The Rule of Three?

問題：

• What does copying an object mean? 複製對象是什麼意思？
• What are the copy constructor and the copy assignment operator ? 複製構造函數和複製賦值運算符是什麼？
• When do I need to declare them myself? 我何時須要本身聲明？
• How can I prevent my objects from being copied? 如何防止對象被複制？

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解決方案：

參考一： https://stackoom.com/question/HVVy/什麼是三法則
參考二： https://oldbug.net/q/HVVy/What-is-The-Rule-of-Three