C++ 運算子多載

標籤：運算子多載   類   友元函數   

C++實現運算子多載

#include <iostream>using namespace std;//#define SHOWclass Int{    friend bool operator>(const Int& x,const Int& y);    //friend int operator>(const Int& x,const Int& y);    friend bool operator<(const Int& x,const Int& y);    friend bool operator==(const Int& x,const Int& y);    friend Int operator<<(const Int& x,const Int& y);    friend Int operator>>(const Int& x,const Int& y);    friend Int& operator+=(Int& x,const Int& y);    friend Int& operator-=(Int& x,const Int& y);    friend Int& operator*=(Int& x,const Int& y);    friend Int& operator/=(Int& x,const Int& y);    friend ostream& operator<<(ostream& out,const Int& x);  //重載流插入運算子<<    friend istream& operator>>(istream& input,const Int& x);//重載流提取運算子>>public:    Int(int x=0):i(x)    {        #ifdef SHOW        cout<<"Creat Int Obj : "<<this<<endl;        #endif // SHOW    }    Int(const Int& x)    {        #ifdef SHOW        cout<<"Copy Int Obj : "<<this<<endl;        #endif // SHOW    }    Int& operator=(const Int& x)    {        #ifdef SHOW        cout<<"Assign,"<<this<<" : "<<&x<<endl;        #endif // SHOW        if(this != &x)        {            i = x.i;        }        return *this;    }    ~Int()    {        #ifdef SHOW        cout<<"Free Int Obj : "<<this<<endl;        #endif // SHOW    }    const Int operator+(const Int& x);    const Int operator-(const Int& x);    const Int operator*(const Int& x);    const Int operator/(const Int& x);    const Int operator%(const Int& x);    const Int operator&(const Int& x);    const Int operator|(const Int& x);    const Int operator^(const Int& x);    const Int operator~();    const Int operator!();    const Int operator++();   //前置++運算子    const Int operator++(int);//後置++運算子    const Int operator--();   //前置--運算子    const Int operator--(int);//後置--運算子    const Int operator+=(const Int& x);    const Int operator-=(const Int& x);private:    int i;};ostream& operator<<(ostream& out,const Int& x){    out<<x.i;    return out;}istream& operator>>(istream& input,const Int& x){    input>>x.i;    return input;}bool operator>(const Int& x,const Int& y){    if(x.i>y.i)    {        return true;    }    else    {        return false;    }}int operator>(const Int& x ,const Int& y){    return x.i>y.i;}bool operator<(const Int& x,const Int& y){    if(x.i<y.i)    {        return true;    }    else    {        return false;    }}bool operator==(const Int& x,const Int& y){    if(x.i==y.i)    {        return true;    }    else    {        return false;    }}Int operator<<(const Int& x,const Int& y){    return (x.i<<y.i);}Int operator>>(const Int& x,const Int& y){    return (x.i>>y.i);}Int& operator+=(Int& x,const Int& y){    x.i += y.i;    return x;}Int& operator-=(Int& x,const Int& y){    x.i -= y.i;    return x;}Int& operator*=(Int& x,const Int& y){    x.i *= y.i;    return x;}Int& operator/=(Int& x,const Int& y){    x.i /= y.i;    return x;}const Int Int::operator+(const Int& x){    return (i+x.i);}const Int Int::operator-(const Int& x){    return (i-x.i);}const Int Int::operator*(const Int& x){    return (i*x.i);}const Int Int::operator/(const Int& x){    return (i/x.i);}const Int Int::operator%(const Int& x){    return (i%x.i);}const Int Int::operator&(const Int& x){    return (i&x.i);}const Int Int::operator|(const Int& x){    return (i|x.i);}const Int Int::operator^(const Int& x){    return (i^x.i);}const Int Int::operator~(){    return ~i;}const Int Int::operator!(){    return !i;}const Int Int::operator++(){    ++ i;    return *this;}const Int Int::operator++(int){    Int tmp(*this);    i ++;    return tmp;}const Int Int::operator--(){    -- i;    return *this;}const Int Int::operator--(int){    Int tmp(*this);    i --;    return tmp;}int main(){    Int t(10),t1(9),t2(3);    t = t1 + t2;    cout<<t<<endl;    t = t1 - t2;    cout<<t<<endl;    t = t1 * t2;    cout<<t<<endl;    t = t1 / t2;    cout<<t<<endl;    t = t1 % t2;    cout<<t<<endl;    ++ t;    cout<<t<<endl;    t ++;    cout<<t<<endl;    -- t;    cout<<t<<endl;    t --;    cout<<t<<endl;    t = t1>t2;    cout<<t<<endl;    t = t1<t2;    cout<<t<<endl;    t = t1==t2;    cout<<t<<endl;    t = t1&t2;    cout<<t<<endl;    t = t1|t2;    cout<<t<<endl;    t = t1^t2;    cout<<t<<endl;    t = ~t1;    cout<<t<<endl;    t= !t1;    cout<<t<<endl;    t = t1<<t2;    cout<<t<<endl;    t = t1>>t2;    cout<<t<<endl;    t += t1;    cout<<t<<endl;    t -= t1;    cout<<t<<endl;    t *= t1;    cout<<t<<endl;    t /= t1;    cout<<t<<endl;    return 0;}

C++ 運算子多載