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Usage of "new" and "delete" in U++ [message #27135]

Sun, 27 June 2010 15:41

281264
Messages: 272
Registered: June 2010
Location: Spain

Experienced Member

From the �manual� in the web one can see that new and delete are not present in U++. Does this mean that ALL the widgets are created statically and therefore they are created at compilation time?

If the answer is yes, the implication is that when the application terminates ALL the objects (widgets, classes, etc..) are deleted automatically (with the exception of the objects created with new)

What do you think?

Thank you,

Javier

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Re: Usage of "new" and "delete" in U++ [message #27137 is a reply to message #27135]

Sun, 27 June 2010 15:54

sergeynikitin
Messages: 748
Registered: January 2008
Location: Moscow, Russia

Contributor

Read it:
http://www.ultimatepp.org/www$uppweb$overview$en-us.html

All screen object are stack object.

And this very usual!

All screen object - the object stack.

And it is very convenient!
When we leave the area of life the object - it is removed.

There is no need garbage collectors.

For complex structures use the containers.

Description of the containers are here:
http://www.ultimatepp.org/srcdoc$Core$Tutorial$en-us.html

SergeyNikitin<U++>( linux, wine )
{
under( Ubuntu || Debian || Raspbian );
}

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Re: Usage of "new" and "delete" in U++ [message #27141 is a reply to message #27135]

Sun, 27 June 2010 22:56

andrei_natanael
Messages: 262
Registered: January 2009

Experienced Member

It is possible to create widgets on stack or on heap, but U++ developers encourage to use stack because C++ take care of allocated memory, so you won't have to think about allocations/deallocation problems. There are only few times when you need to allocate on heap, you may had encounter that in U++ GUI Tutorial, point 6 - "Multiple main windows". I think it's better to use every feature from the language (let compiler take care of your memory) and don't complicate you're self with new/delete. Use pointers only to point to things.

Andrei

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Re: Usage of "new" and "delete" in U++ [message #27150 is a reply to message #27135]

Mon, 28 June 2010 17:20

mr_ped
Messages: 826
Registered: November 2005
Location: Czech Republic - Praha

Experienced Contributor

new and delete of course are present. Smile

But usually you don't need them, when you work in U++ way of doing things.

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Re: Usage of "new" and "delete" in U++ [message #27151 is a reply to message #27135]

Mon, 28 June 2010 20:02

mirek
Messages: 14261
Registered: November 2005

Ultimate Member

281264 wrote on Sun, 27 June 2010 09:41

From the �manual� in the web one can see that new and delete are not present in U++. Does this mean that ALL the widgets are created statically and therefore they are created at compilation time?

No.

What is going on is that heap is considered an implementation detail that should not be exposed in any interfaces.

Thus all U++ interfaces are designed to work without heap objects and that is why you do not see many new/deletes in the normal high-level code.

Also, for program logic, most cases where heap/new/delete was/is required in normal C/C++ programming are solved by using U++ containers.

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