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原博客：http://www.cnblogs.com/speedmancs/archive/2011/06/09/2076873.html
1 class person{ 2 private: 3 int age; 4 public: 5 person(int a){ 6 this->age=a; 7 } 8 inline bool operator == (const person &ps) const; 9 };
实现方式如下：
1 inline bool person::operator==(const person &ps) const 2 { 3 if (this->age==ps.age) 4 return true; 5 return false; 6 }
调用方式如下：
1 #include 2 using namespace std; 3 int main() 4 { 5 person p1(10); 6 person p2(20); 7 if(p1==p2) cout<<”the age is equal!”< return 0; 8 }
这里，因为operator ==是class person的一个成员函数，所以对象p1,p2都可以调用该函数，上面的if语句中，相当于p1调用函数==，把p2作为该函数的一个参数传递给该函数，从而实现了两个对象的比较。
1 class person 2 { 3 public: 4 int age; 5 public: 6 }; 7 8 bool operator==(person const &p1 ,person const & p2) 9 //满足要求，做操作数的类型被显示指定 10 { 11 if(p1.age==p2.age) 12 return true; 13 return false; 14 }
调用方式如下：
1 int main() 2 { 3 person rose; 4 person jack; 5 rose.age=18; 6 jack.age=23; 7 if(rose==jack) 8 cout<<"ok"< return 0; 9 }
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#include <iostream>using namespace std;class A{public: A(double _data = 0.0):data(_data){} A& operator = (const A& rhs) { data = rhs.data; return *this; } friend A operator + (const A& lhs,const A& rhs); friend A operator - (const A& lhs,const A& rhs); friend A operator * (const A& lhs,const A& rhs); friend A operator + (const A& lhs,double rhs); friend A operator + (double lhs,const A& rhs); friend A operator * (const A& lhs,double rhs); friend A operator * (double lhs,const A& rhs); friend A operator - (const A& lhs,double rhs); friend A operator - (double lhs,const A& rhs); friend ostream& operator << (ostream& fout,A& a);// A& operator += (const A& rhs);// A& operator -= (const A& rhs);// A& operator *= (const A& rhs); private: double data;};A operator + (const A& lhs,const A& rhs){ A res(0); res.data = lhs.data + rhs.data; return res;}A operator - (const A& lhs,const A& rhs){ A res(0); res.data = lhs.data - rhs.data; return res;}A operator * (const A& lhs,const A& rhs){ A res(0); res.data = lhs.data * rhs.data; return res;} A operator + (const A& lhs,double rhs) { A res(0); res.data = lhs.data + rhs; return res;}A operator + (double lhs,const A& rhs){ A res(0); res.data = lhs + rhs.data; return res;}A operator * (const A& lhs,double rhs){ A res(0); res.data = lhs.data * rhs; return res;}A operator * (double lhs,const A& rhs){ A res(0); res.data = lhs * rhs.data; return res;}A operator - (const A& lhs,double rhs){ A res(0); res.data = lhs.data - rhs; return res; }A operator - (double lhs,const A& rhs){ A res(0); res.data = lhs - rhs.data; return res; } ostream& operator << (ostream& fout,A& a){ fout << a.data ; return fout;}int main(int argc, char* argv[]){ A a(2.3); A b(1.2); A d(3.4); A c; c = a + b + d; c=a+b; c=a+1.0; c=a-b; c=a-1.0; c=a*b; c=a*1.0; cout << c << endl; c=1.0+2.0*a*a-3.0*a*b; cout << c << endl; return 0;} |
[019]转--C++ operator关键字(重载操作符)
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原文地址：http://www.cnblogs.com/hustcser/p/4173758.html
