复制带有指针和结构的类的构造函数

我对具有结构和指针成员变量的类的复制构造函数和赋值构造函数有以下查询。

这是我的班级

class myClass{                                        
       public:      
         Calculator mCalc;      // Calculator is a class that I defined elsewhere
         struct Sstatus{
             bool add_flag;
             int error_code;
             CvMat* matrix;      // I am using OpenCV here for matrix handle 
             double params[6];
         }; 
        // class function
        myClass(void);
       ~myClass(void);
       protected:
              int index;
              BasedClass*  interface;
              CvMat* matrix_int;
       private:
              int calc_index;
              bool* done;
};

我的类函数如下

myClass::myClass(void):mCalc(0),
                       index(0),
                       matrix_int(0),
                       calc_index(0),
                       done(0)
{
        interface = new DerivedClass();     // derived class is extended by the base class
}
myClass::~myClass(void){
        delete interface;
}
// defining copy constructor
myClass::myClass(const myClass& o):mCalc(o.mCalc),
                                   index(o.index),
                                   calc_index(o.calc_index),
                                   done(o.done)
{
          // assigning new memory for member pointers for copying
              matrix_int = new CvMat();
              *matrix_int = o.matrix_int;
              interface = new DerivedClass(); 
              *interface = o.interface;
              done = new bool();
              *bool = o.done;
}
// defining assignment operator
myClass::myClass& operator=(const myClass& o)
{
        if(this != &o) 
        {
              mCalc = o.mCalc;
              index = o.index;
              calc_index = o.calc_index;
          // assigning new memory for member pointers for copying
              matrix_int = new CvMat();
              *matrix_int = o.matrix_int;
              interface = new DerivedClass(); 
              *interface = o.interface;
              done = new bool();
              *bool = o.done;
        }
        return *this;
}

我有几个问题

1. 这是复制构造函数和赋值运算符应该如何编码的吗？ 对于成员指针和数组，应该如何做
2. 我不太明白指针成员的赋值和复制构造函数之间的区别。它看起来和我很像
3. 如果我们想为结构定义一个复制构造函数和赋值构造函数，应该怎么做？

谢谢

其他问题：如果我在复制构造函数中使用了 new，是否需要在析构函数中删除它？