How to write a paragraph explain the Big 3?

[cmrcm]

Hi all, I am new here. I wonder anybody knows how to write a paragraph explaining the “ Big 3” - destructor, copy constructor and assignment operator?
Thanks in advance!

[AdrianH]

Hi all, I am new here. I wonder anybody knows how to write a paragraph explaining the “ Big 3” - destructor, copy constructor and assignment operator?
Thanks in advance!

I'm sure that there are many here who can write a paragraph about the 'Big 3', but that is not what we do here. We help our members learn, not give them the answers.

If you write a paragraph about the 'Big 3', we can look at it and direct you accordingly.

Looking forward to hearing your paragraph.


Adrian

[cmrcm]

I am not native English speaker. In my case, it is not easy to describe the big 3 well in English.
My answer is:
Copy constructor: when creating an object, the compiler calls the constructor automatically.
Destructor: automatically called by the compiler when an object archieve itsclosure.
Assignment operator: copy the right hand side into the left hand side.

I know my answer is not complete, any body can help me?

[JosAH]

I am not native English speaker. In my case, it is not easy to describe the big 3 well in English.
My answer is:
Copy constructor: when creating an object, the compiler calls the constructor automatically.
Destructor: automatically called by the compiler when an object archieve itsclosure.
Assignment operator: copy the right hand side into the left hand side.

I know my answer is not complete, any body can help me?

Here are a few hints:

{
   YourClass a; // default constructor;
   ...
   YourClass b= a; // copy constructor
   ...
   yourCallByValueFunction(a); // copy constructor;
   ...
   a= b; // operator=
} // destructor

kind regards,

Jos

[cmrcm]

Here are a few hints:

{
   YourClass a; // default constructor;
   ...
   YourClass b= a; // copy constructor
   ...
   yourCallByValueFunction(a); // copy constructor;
   ...
   a= b; // operator=
} // destructor

kind regards,

Jos

Thanks for reply. I think I am clear about the constructor and operator, could you explain more about the destructor please?

[JosAH]

Thanks for reply. I think I am clear about the constructor and operator, could you explain more about the destructor please?

Well, a destructor destructs an object. When the object held resources the
destructor is the place to relinguish those resources (dynamic memory, files,
sockets, screen estate etc. etc.)

kind regards,

Jos

ps. can you show us the paragraph you had to write on the "big three"?

[cmrcm]

ps. can you show us the paragraph you had to write on the "big three"?

Thanks for explaining. What do you mean by the "paragraph I had"? The question or my answer?

[AdrianH]

Here are a few hints:

{
   YourClass a; // default constructor;
   ...
   YourClass b= a; // copy constructor
   ...
   yourCallByValueFunction(a); // copy constructor;
   ...
   a= b; // operator=
} // destructor

kind regards,

Jos

You also forgot

   YourClass b= a; // copy constructor

Adrian

[AdrianH]

Thanks for explaining. What do you mean by the "paragraph I had"? The question or my answer?

Sounds like you have it under control.

Good luck,


Adrian

[cmrcm]

Here are a few hints:

{
   YourClass a; // default constructor;
   ...
   YourClass b= a; // copy constructor
   ...
   yourCallByValueFunction(a); // copy constructor;
   ...
   a= b; // operator=
} // destructor

kind regards,

Jos

One more thing, are the a and b in 'YourClass a', 'YourClass b= a', 'yourCallByValueFunction(a)' and 'a= b' the same? what's the relationship between them?

[JosAH]

One more thing, are the a and b in 'YourClass a', 'YourClass b= a', 'yourCallByValueFunction(a)' and 'a= b' the same? what's the relationship between them?

'a' and 'b' are two different objects but both instantiations from the same class.

kind regards,

Jos