76 lines
1007 B
C++
76 lines
1007 B
C++
// 运算符重载
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// ++、-- 运算符
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#include <iostream>
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#include <cstring>
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#include <cstdlib>
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using namespace std;
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class A
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{
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private:
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int x;
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public:
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explicit A(int x)
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{
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this->x = x;
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}
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void show()
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{
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cout << x << endl;
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}
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// ++ 运算符重载，类成员函数，单目运算符，++ 在前时不要参数，++ 在后需要一个占位参数
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A &operator++(int);
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A &operator++();
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A *operator--(int);
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A *operator--();
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};
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A &A::operator++(int) // ++ 在后需要有占位参数
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{
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this->x++;
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return *this;
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}
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A &A::operator++()
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{
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++this->x;
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return *this;
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}
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A *A::operator--(int)
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{
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A *tmp = new A(this->x--);
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return tmp;
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}
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A *A::operator--()
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{
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A *tmp = new A(--this->x);
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return tmp;
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}
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int main()
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{
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A a1(5);
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a1.show();
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a1++;
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a1.show();
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++a1;
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a1--;
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a1.show();
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--a1;
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a1.show();
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A a2(8);
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a2--;
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a2--;
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a2++;
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++a2;
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--a2;
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a2.show();
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return 0;
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}
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