C++ 操作符重载 operator = 、operator <

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正常情况下我们不能对两个Class进行 = 、< 、等操作，通过重载操作符就可以了。

eg1:对 operator=

#include <iostream>using namespace std;class A{public:A(){cout << "In A(): " << hex << (long)this << endl;}A(const A&){cout << "In A(const A&): " << hex << (long)this << endl;}~A(){cout << "In ~A(): " << hex << (long)this << endl;}A& operator=(const A& a){cout << "In operator=: " << hex << (long)this << " = " << hex << (long)(&a) << endl;return *this;}};A f(){A a;return a;}int main(int argc, char* argv[]){A a;a = f();return 0;}

eg2：这里有一个类 person ，我们对这个类进行 = 、< 操作。

#pragma  once     class person  {  public:      person(int _age=0):age(_age)      {         }         person& operator = (const person& a)      {          age=a.age;          return *this;      }         bool operator < (const person& a)      {          if(age<a.age)          {              return true;          }          return false;      }     private:      int age;  };

#include "person.cpp"     int main()  {      person a(1);      person b;      b=a;         person c(2);      if(a<c)      {          int qq=0;      }      return 0;  }

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