[jaswi]

Dear OpenFoam Users

I am new to c++ programming. I have been looking the source code of OpenFOAM. I am unable to understand the src/OpenFOAM/primitives/pTraits/pTraits.H
I have added my dounts next to the lines i do not understand, please take a look.

This is what it contains :
-----------------------------------------
#ifndef pTraits_H
#define pTraits_H

namespace Foam
{

class Istream; // <-- what does it means here

--> Next it defines a template class pTraits with template argument <class>. I am confused about what is class primitive !! as in the definition [: public primitive ] indicates that class pTraits is also inherited from primitive .

template<class>
class pTraits
:
public primitive // <--- indicate inheritance ??
{

public:

pTraits(Istream& is) // <-- is this a constructor
:
primitive(is)
{}
};

} // End namespace Foam

#endif

Can anybody tell what is primitive and from where it comes !!!

Thanks alot

With Best Regards
Jaswinder

[hjasak]

You did pick a hard place to start: this is advanced templating you are looking at and I bet there is VERY few people on the forum who can actually answer this question properly.

So:

template<class>
class pTraits

means a pTraits class is a template, and we will use a primitive as the template keyword.

Now it gets tricky, with template specialisation for raw types and the "curiously recurring template pattern". Trust me, right now you don't need to know.

Hrv

[jaswi]

Thanks Hrv for the answer.

I take your word and keep away from that for a while.

I sent you an email last week. Please find some time to take a look at that. That was about the Turbulence modelling w.r.t. interface capturing model.

With Best Regards
Jaswinder