tmp< T >

ata · July 15, 2010, 01:58

Hi FOAMers
Can any one tell me "tmp< T >" class is for what?
It seems it is "A class for managing temporary objects." but can any one explain for me what is difference between
const GeometricField< Type, fvsPatchField, surfaceMesh >
and
const tmp< GeometricField< Type, fvsPatchField, surfaceMesh > >
Any help will be appreciated
Best regards

Ata

akidess · July 15, 2010, 05:07

See http://www.cfd-online.com/Forums/ope...acro-pain.html

ata · July 15, 2010, 08:45

Hi Anton Kidess
Thank you very much
Best regards

Ata

ata · July 17, 2010, 02:24

Hi Anton Kidess
So, would you please tell me what is difference between tmp<T> and passing a reference (&T)?
Thank you very much
Best regards

Ata

marupio · July 17, 2010, 11:58

tmp is used for returning *local variables* without copying. You can't pass a reference because the data it points to is going out of scope. There's an article on the wiki here:

http://openfoamwiki.net/index.php/OpenFOAM_guide/tmp

ata · July 17, 2010, 21:37

Hi David
Thank you very much
Best regards

Ata

July 15, 2010, 01:58	tmp< T >	#1
ata Senior Member ata kamyabi Join Date: Aug 2009 Location: Kerman Posts: 323 Rep Power: 18	Hi FOAMers Can any one tell me "tmp< T >" class is for what? It seems it is "A class for managing temporary objects." but can any one explain for me what is difference between const GeometricField< Type, fvsPatchField, surfaceMesh > and const tmp< GeometricField< Type, fvsPatchField, surfaceMesh > > Any help will be appreciated Best regards Ata

July 15, 2010, 08:45	Thanks	#3
ata Senior Member ata kamyabi Join Date: Aug 2009 Location: Kerman Posts: 323 Rep Power: 18	Hi Anton Kidess Thank you very much Best regards Ata

July 17, 2010, 02:24	difference between tmp<T> and &T	#4
ata Senior Member ata kamyabi Join Date: Aug 2009 Location: Kerman Posts: 323 Rep Power: 18	Hi Anton Kidess So, would you please tell me what is difference between tmp<T> and passing a reference (&T)? Thank you very much Best regards Ata

July 17, 2010, 21:37	Thanks	#6
ata Senior Member ata kamyabi Join Date: Aug 2009 Location: Kerman Posts: 323 Rep Power: 18	Hi David Thank you very much Best regards Ata

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July 15, 2010, 05:07		#2
akidess Senior Member Anton Kidess Join Date: May 2009 Location: Germany Posts: 1,377 Rep Power: 30	See http://www.cfd-online.com/Forums/ope...acro-pain.html

July 17, 2010, 11:58		#5
marupio Senior Member David Gaden Join Date: Apr 2009 Location: Winnipeg, Canada Posts: 437 Rep Power: 22	tmp is used for returning local variables without copying. You can't pass a reference because the data it points to is going out of scope. There's an article on the wiki here: http://openfoamwiki.net/index.php/OpenFOAM_guide/tmp