C++深拷贝浅拷贝示例程序

#include <iostream>

class String
{
private:
    char *m_BufMemPtr;
    int m_BufSize;

public:
    String(const char *srcbuf)
    {
        m_BufSize = strlen(srcbuf);
        m_BufMemPtr = new char[m_BufSize + 1];
        memcpy(m_BufMemPtr, srcbuf, m_BufSize);
        m_BufMemPtr[m_BufSize] = '\0';
    }
    String(const String& str)
    {
        this->m_BufSize = str.m_BufSize;
        this->m_BufMemPtr = new char[m_BufSize + 1];
        memcpy(this->m_BufMemPtr, str.m_BufMemPtr, m_BufSize);
        m_BufMemPtr[this->m_BufSize] = '\0';
    }

    ~String()
    {
        delete[] m_BufMemPtr;
    }

    friend std::ostream& operator<<(std::ostream& stream,const String& str);
};

std::ostream& operator<<(std::ostream& stream, const String& str)
{
    stream << str.m_BufMemPtr << std::endl;
    return stream;
}

int main()
{
    String str1("hello world");
    String str2 = str1;
    std::cout << str1;
    std::cout << str2;
}