什么是三法则？ - What is The Rule of Three?

问题：

• What does copying an object mean? 复制对象是什么意思？
• What are the copy constructor and the copy assignment operator ? 复制构造函数和复制赋值运算符是什么？
• When do I need to declare them myself? 我何时须要本身声明？
• How can I prevent my objects from being copied? 如何防止对象被复制？

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解决方案：

参考一： https://stackoom.com/question/HVVy/什么是三法则
参考二： https://oldbug.net/q/HVVy/What-is-The-Rule-of-Three