day5.am--拷贝构造与拷贝赋值

 

 

Array& operator = Array(Array const& that){
        //避免自赋值
        if(&that != this){
            //释放旧资源
            if(m_array)
            {
                delete[] m_array;
                m_array = NULL;
            }
            //分配新资源
            m_array = new int[that.m_size];
            //拷贝新内容
            memcpy(m_array, that.m_array, that.m_size * sizeof(that.m_array[0]));
            m_size = that.m_size;
        }
        //返回自引用
        return *this; 
}