default constructor,copy constructor,copy assignment

最新推荐文章于 2025-09-07 19:33:12 发布

weixin_30340819

最新推荐文章于 2025-09-07 19:33:12 发布

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CC 4.0 BY-SA版权

文章标签： c/c++

原文链接：http://www.cnblogs.com/hellogiser/p/default-constructor_vs_copy-constructor_vs_copy-assignment.html

本文详细介绍了C++中默认构造函数、拷贝构造函数和赋值运算符的区别与使用场景，通过实例展示了它们的实现方式，并分析了在不同情况下的行为差异。

 C++ Code 

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <iostream>
using namespace std;

class Base
{
public:
    Base(int v = 10): m_v(v)
    {
        puts("default consturctor");
    }

    Base(const Base &other)
    {
        puts("copy consturctor");
        this->m_v = other.m_v;
    }

    Base &operator =(const Base &other)
    {
        puts("copy assignment");
        if(this == &other)
            return *this;
        this->m_v = other.m_v;
        return *this;
    }
private:
    int m_v;
};

void test_case()
{
    Base a;
    Base b(a);
    Base c = a;
    Base d;
    d = a;
}

int main()
{
    test_case();
    return 0;
}
/*
default consturctor
copy consturctor
copy consturctor
default consturctor
copy assignment
*/

转载于:https://www.cnblogs.com/hellogiser/p/default-constructor_vs_copy-constructor_vs_copy-assignment.html