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C&C++ 发布时间：2022-04-03 发布网站：大佬教程 code.js-code.com

大佬教程收集整理的这篇文章主要介绍了C：实现复制构造函数和复制赋值运算符，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。

@H_489_0@

在C中阅读有关复制构造函数和复制赋值运算符之后,我尝试创建一个简单的例子.虽然下面的代码段显然是有效的,但我不知道我是否正确地执行拷贝构造函数和拷贝赋值运算符.如果有任何错误/改进或更好的例子来了解相关概念,请问你能指出一点.

class Foobase
{
    int bInt;

public:
    Foobase() {}

    Foobase(int b) { bInt = b;}

    int GetValue() { return bInt;}

    int SETVALue(const int& val) { bInt = val; }
};


class Foobar
{
    int var;    
    Foobase *base;      

public:
    Foobar(){}

    Foobar(int v)
    {
        var = v;        
        base = new Foobase(v * -1);

    }

    //Copy constructor
    Foobar(const Foobar& foo)
    {       
        var = foo.var;
        base = new Foobase(foo.GetBaseValue());
    }

    //Copy assignemnt operator
    Foobar& operator= (const Foobar& other)
    {
        if (this != &other) // prevent self-assignment
        {
            var = other.var;
            base = new Foobase(other.GetBaseValue());

        }
        return *this;
    }

    ~Foobar()
    {
        delete base;
    }

    void SETVALue(int val)
    {
        var = val;
    }

    void SetBaseValue(const int& val)
    {
        base->SETVALue(val);
    }

    int GetBaseValue() const
    {
        return(base->GetValue());
    }

    void Print()
    {
        cout<<"Foobar Value: "<<var<<endl;
        cout<<"Foobase Value: "<<base->GetValue()<<endl;

    }   

};

int main()
{
    Foobar f(10);       
    Foobar g(f);  //calls copy constructor
    Foobar h = f; //calls copy constructor

    Foobar i;
    i = f;

    f.SetBaseValue(12);
    f.SETVALue(2);    

    Foobar j = f = z; //copy constructor for j but assignment operator for f

    z.SetBaseValue(777);
    z.SETVALue(77);

    return 1;
}