复制构造函数

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>

class CStudent
{
    friend std::ostream& operator<<( std::ostream&, const CStudent& );
public:
    CStudent( const char* name, unsigned int age );
    CStudent( const CStudent& rhs );
    CStudent& operator=( const CStudent& rhs );
    ~CStudent();
    void show(void);
private:
    char* name_;
    unsigned int age_;

};

using namespace std;

CStudent::CStudent( const char* name, unsigned int age )
{
    name_ = new char[strlen(name)+1];
    strcpy( name_, name );
    age_ = age;
}
CStudent::CStudent( const CStudent& rhs )
{
    name_ = new char[strlen(rhs.name_)+1];
    strcpy( name_, rhs.name_ );
    age_ = rhs.age_;
}
CStudent& CStudent::operator=( const CStudent& rhs )
{
    if( this != &rhs )
    {
        delete[] name_;

        name_ = new char[strlen(rhs.name_)+1];
        strcpy( name_, rhs.name_ );
        age_ = rhs.age_;
    }
    return *this;
}
CStudent::~CStudent()
{
    delete[] name_;
    cout<<"destructor of class"<<endl;
}
ostream& operator<<( ostream& os, const CStudent& st )
{
    return os << st.name_ << ' ' << st.age_;
}

int main()
{
    CStudent* pst1 = new CStudent("张三",20);
    CStudent st2("李四",50);
    CStudent st3(st2);

    cout << *pst1 << endl;
    cout << st2 << endl;
    cout << st3 << endl;

    delete pst1;
    return 0;
}