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Forum: Documentation and Examples
Re: Question puzzled by exrdmPhysicsList in "extended examples" (Alain Ferragut)
Date: 05 Jan, 2005
From: Vladimir IVANTCHENKO <vnivanch@mail.cern.ch>

On Wed, 5 Jan 2005, Alain Ferragut wrote:

> *** Discussion title: Documentation and Examples
> Email replies to PublicHyperNews@slac.stanford.edu must include:
>   In-Reply-To: <"/docsexamples/123"@geant4-hn.slac.stanford.edu>
>   Subject: ...change this to be about your reply.
> 
> Hi, I do not understand some code lines in exrdm example. It is located
> in the physics list , SelectPhysicsList() method.
> 
> 1/ "if (!hadPhysicsList) delete hadPhysicsList;" . What is the purpose
> of deleting a NULL pointer ? We need to delete it if the corresponding
> object already exists, so that a new one can be created...Or do I miss
> something.....
> 
> 2/ "if (!hadPhysicsList) delete emPhysicsList;". I get even more
> confused here. Why deleting emPhysicsList if hadPhysicsList is NULL ?
> Isn't it "if (emPhysicsList) delete emPhysicsList;"
> 
> Thanks,
> 
>               Alain

Hi,

In which example you find this line? I cannot find out.

VI

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