C++ Rule of Three

Posted 2020-06-11

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Rule of Three

The rule of three (also known as the Law of The Big Three or The Big Three) is a rule of thumb in C++ (prior to C++11) that claims that if a class defines one (or more) of the following it should probably explicitly define all three:^[1]

destructor
copy constructor
copy assignment operator

如果需要析构函数，则一定需要拷贝构造函数和赋值操作符

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