Assignment operators 重载【c++ primer 】
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Assignment operators can be overloaded. Unlike the compoundassignment operators, every assignment operator, regardless of parameter type, must be defined as a member function.
// illustration of assignment operators for class stringclass string {public:string& operator=(const string &); // s1 = s2;string& operator=(const char *); // s1 = "str";string& operator=(char); // s1 = 'c';// ....};
Assignment Should Return a Reference to *this 。 Moreover, because assignment returns a reference there is no
need to create and destroy a temporary copy of the result.
无需多说,照着用就行了。因为你是给本类的对象赋值,所以少一个参数还是很方便的
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