136 lines
2.7 KiB
C++
136 lines
2.7 KiB
C++
#include <iostream>
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using namespace std;
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class complex { // 复数类声明
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public: // 外部接口
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complex(double r = 0, double i = 0) {
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this->r = r;
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this->i = i;
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// this->num = ++count;
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// cout << "(Num: " << this->num << ")";
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cout << "Constructor!";
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display();
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}
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complex(const complex &c) : r(c.r), i(c.i) {
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// this->num = ++count;
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// cout << "(Num: " << this->num << ")";
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cout << "Copy Constructor!";
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display();
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}
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~complex() {
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// cout << "(Num: " << this->num << ")";
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cout << "Destructor!";
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display();
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}
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complex operator+(complex c1);
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void display(); // 输出复数
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private:
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// static int count;
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// int num;
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double r; // 复数实部
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double i; // 复数虚部
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};
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complex complex::operator+(complex c2) {
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// complex result(r + c2.r, i + c2.i);
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// return result;
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return complex(r + c2.r, i + c2.i);
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// 原文：return complex(r + c2.r, i + c2.i)，不能编译=_=
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}
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void complex::display() {
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cout << "(" << r << "," << i << ")" << endl;
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}
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// int complex::count = 0;
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int main() { // 主函数
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complex c1(3, 2), c2(2, 5), c3;
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cout << "c1=";
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c1.display();
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cout << "c2=";
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c2.display();
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c3 = c1 + c2;
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cout << "c3=c1+c2=";
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c3.display();
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return 0;
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}
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// 这个题我愿称之为史上最烂烂题。他的输出与编译器有没有开右值引用优化有很大的关系。
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// 中间一些注释掉的代码是我补的，可以帮助理解一下到底是哪个对象在做这些操作。
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/*
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关闭右值引用优化：
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Constructor!(3,2)
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Constructor!(2,5)
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Constructor!(0,0)
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c1=(3,2)
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c2=(2,5)
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Copy Constructor!(2,5)
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Constructor!(5,7)
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Copy Constructor!(5,7)
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Destructor!(5,7)
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Destructor!(5,7)
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Destructor!(2,5)
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c3=c1+c2=(5,7)
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Destructor!(5,7)
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Destructor!(2,5)
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Destructor!(3,2)
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*/
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/*
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(Num: 1)Constructor!(3,2)
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(Num: 2)Constructor!(2,5)
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(Num: 3)Constructor!(0,0)
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c1=(3,2)
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c2=(2,5)
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(Num: 4)Copy Constructor!(2,5)
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(Num: 5)Constructor!(5,7)
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(Num: 6)Copy Constructor!(5,7)
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(Num: 5)Destructor!(5,7)
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(Num: 6)Destructor!(5,7)
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(Num: 4)Destructor!(2,5)
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c3=c1+c2=(5,7)
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(Num: 6)Destructor!(5,7)
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(Num: 2)Destructor!(2,5)
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(Num: 1)Destructor!(3,2)
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*/
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/*
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开启右值引用优化：
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Constructor!(3,2)
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Constructor!(2,5)
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Constructor!(0,0)
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c1=(3,2)
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c2=(2,5)
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Copy Constructor!(2,5)
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Constructor!(5,7)
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Destructor!(5,7)
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Destructor!(2,5)
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c3=c1+c2=(5,7)
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Destructor!(5,7)
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Destructor!(2,5)
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Destructor!(3,2)
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*/
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/*
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(Num: 1)Constructor!(3,2)
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(Num: 2)Constructor!(2,5)
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(Num: 3)Constructor!(0,0)
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c1=(3,2)
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c2=(2,5)
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(Num: 4)Copy Constructor!(2,5)
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(Num: 5)Constructor!(5,7)
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(Num: 5)Destructor!(5,7)
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(Num: 4)Destructor!(2,5)
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c3=c1+c2=(5,7)
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(Num: 5)Destructor!(5,7)
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(Num: 2)Destructor!(2,5)
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(Num: 1)Destructor!(3,2)
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*/ |