53 lines
703 B
C++
53 lines
703 B
C++
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// 重载 * 和 ->
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// 注意: * 和 -> 的重载不能有参数
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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) : x(x) {}
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void printA()
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{
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cout << "x = " << x << endl;
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}
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};
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class B
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{
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private:
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A *mA;
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public:
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B(int x) : mA(new A(x))
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{
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}
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A *operator->()
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{
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return mA;
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}
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A &operator*()
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{
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return *mA;
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}
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};
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int main()
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{
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B b(20);
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// b -> 执行 B 类的 -> 重载，返回 A 类的对象的指针
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b->printA();
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B b2(30);
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// *b 执行 B 类的 * 重载函数，返回 A 类的对象
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(*b2).printA();
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return 0;
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}
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