c++ 泛型的赋值运算符怎么写 简单实验

1.概要

1.泛型的赋值运算符怎么写
A operator=(const A& a)
A<T> operator=(const A<T>& a)
那个是正确的呢？
结果：都可以，但是不能重复

2.代码

#include <iostream>
using namespace std;

class B {
public:
    B operator=(const B& b) {
        cout << "Assignment operator B\n";
        return *this;
    }
};

namespace T1 {
    void test() {
        B a;
        B b;
        a = b;
    }
}

namespace T2 {
    template<class T>
    class A {
    public:
        int a;
        //赋值运行符是否需要T:用没问题
        A<T> operator=(const A<T>& a) {
            cout << "Assignment operator A<T>\n";
            return *this;
        }
    };
    void test() {
        A<B> a;
        A<B> b;
        a = b;
    }
}
namespace T3 {
    template<class T>
    class A {
    public:
        int a;
        //赋值运行符是否需要T:不用也没问题
        A operator=(const A& a) {
            cout << "Assignment operator A\n";
            return *this;
        }
    };
    void test() {
        A<B> a;
        A<B> b;
        a = b;
    }
}
namespace T4 {
    class C {
    public:
        //判断右值是否必须是常量
        C operator=(C& b) {
            cout << "Assignment operator C\n";
            return *this;
        }
    };
    void test() {
        C a;
        C b;
        a = b;
    }
}

int main()
{
    T1::test();
    T2::test();
    T3::test();
    T4::test();

    cout << "Hello World!\n";
}

3.运行结果

Assignment operator B
Assignment operator A<T>
Assignment operator A
Assignment operator C
Hello World!