[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