c++ 拷貝構造函數 繼承

拷貝構造函數要求把所有變量都需要做拷貝。在有繼承關系情況先，子類的拷貝構造函數，需要調用父類拷貝構造函數。示例代碼如下：

class Base{
public:
    virtual ~Base();
    Base(const char *pStr);
    Base(const Base &other);
    virtual void CallFunction() ;
public:
    char *m_pBase;
};

Base::Base(const char *pStr){
    if (pStr) {
        long iLen = strlen(pStr)+1;
        m_pBase = new char[iLen];
        memset(m_pBase, 0, iLen);
        strcpy(m_pBase, pStr);
    }}

Base::~Base(){
    if (m_pBase) {
        delete [] m_pBase;
        m_pBase = NULL;
    }
}

Base::Base(const Base &other){
    if (m_pBase) {
        delete m_pBase;
        m_pBase = NULL;
    }
    long iLen = strlen(other.m_pBase)+1;
    m_pBase = new char[iLen];
    memset(m_pBase, 0, iLen);
    strcpy(m_pBase, other.m_pBase);
}

class Child:public Base{
public:
    ~Child();
    Child(const char *pStr , const char *pBase);
    Child(const Child &other);
public:
    char *m_pChild;
};

Child::Child(const char *pStr , const char *pBase):Base(pBase){//初始化列表中調父類構造函數
    if (pStr) {
        long iLen = strlen(pStr)+1;
        m_pChild = new char[iLen];
        memset(m_pChild, 0, iLen);
        strcpy(m_pChild, pStr);
    }
}

Child::Child(const Child &other):Base(other){//調父類拷貝構造函數
    if (m_pChild) {
        delete m_pChild;
        m_pChild = NULL;
    }
    long iLen = strlen(other.m_pChild)+1;
    m_pChild = new char[iLen];
    memset(m_pChild, 0, iLen);
    strcpy(m_pChild, other.m_pChild);
}


Child::~Child(){
    if (m_pChild) {
        delete [] m_pChild;
        m_pChild = NULL;
    }
}

Test：

Child ch("child", "base");

 Child ch2(ch);