I feel that c ++ is a bad place

killerss

The reference ra is not pointed to another object here-it just modifies the value of the object (memory block) pointed to by reference ra

thiefgroup

>> If you don't know this, it is often debugged for a long time because of this mechanism.

If you do n’t know, learn more.

redcoffeecup

What is a virtual table? I am a novice.

KTPOPO

TOfinefineboy
It is precisely because of what you said that the behavior the landlord said.

In C ++, value semantics is the basis. This is different from many other object-oriented languages. Pointers are used to express reference semantics (pointers themselves are also values ​​...). The problem the landlord said is actually because of C ++ It is value semantic behavior, and what he wants is to quote something semantic. If you want this kind of thing, you can only implement it yourself. C ++ provides enough support to do this.

hunqiu223

g791113
 
 
   
At first glance, the landlord has never studied software engineering.

  
 
The first f () is polymorphic.
The second f () is the base class

intoblue00

A&ra = * pa;
ra.f ();
ra = c;
ra.f ();

It's wrong upstairs,
Both f are polymorphic and both are pa-> f

babymaya

A man is born of a human fuck, a demon is born of a demon fuck, if a demon has humanity, it is not a demon, it is a demon ...

鸟哥

Read less, and naturally take longer to debug. Read more

master20404

class A
{
public:
int v;
A () {}
virtual void f () {cout << "A :: f ()" << endl;}
virtual ~ A () {}
};

class B: public A
{
public:
char * m_str;
B () {m_str = new char [10];}
void f () {cout << "B :: f ()" << endl;}
virtual ~ B () {delete m_str;}
};

The above has added new and delete to class B of the LZ code.
Execute the same main function as LZ. If the = operator will copy the virtual table, it will inevitably cause a memory leak.

112233qwe

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