[Tobi]

Hi all,


just a brief question. Analyzing the fvm::div() functions in the inside the fvm namespace, we can see that in the last instance, we have:

template< class Type>
tmp< fvMatrix< Type>>
div
(
    const surfaceScalarField& flux,
    const GeometricField<Type, fvPatchField, volMesh>& vf,
    const word& name
)
{
    return fv::convectionScheme<Type>::New
    (
        vf.mesh(),
        flux,
        vf.mesh().divScheme(name)
    )().fvmDiv(flux, vf);
}

However, the fv.mesh().divScheme(name) should return an ITstream. The New() function of the convectionScheme class however takes an Istream. The problem I have right now, I cannot find the conversion of the ITstream and Istream anywhere.

1. vf.mesh() return the object of class Mesh (which is similar to fvMesh)
2. the fvMesh object is used to apply the divScheme() function which is implemented in the inherited class fvSchemes. This function returns an ITstream.
3. Now, I am not sure why it can be converted into an Istream directly?

Any suggestion is appreaciated. I guess I just can't see it or I am mixing anything up.
Thanks in advance.

[Zeppo]

Hi
Simple. ITstream is derived from Istream that's why you don't need any explicit conversion function, conversion is done implicitly.

[Tobi]

Of course. Thanks Zeppo.