[Golden]

Hi, formers,

I'm trying to understand what does "FOR_ALL_FIELD_TYPES" function do in source codes in OpenFOAM.

I have found this function at "fieldTypes.H"
and its definition is written below:

Description
    Include the header files for all the primitive types that Fields are
    instantiated for.

\*---------------------------------------------------------------------------*/

#ifndef fieldTypes_H
#define fieldTypes_H

#include "label.H"
#include "scalar.H"
#include "vector.H"
#include "sphericalTensor.H"
#include "symmTensor.H"
#include "tensor.H"
#include "triad.H"
#include "macros.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#define CAPITALIZE_scalar Scalar
#define CAPITALIZE_vector Vector
#define CAPITALIZE_sphericalTensor SphericalTensor
#define CAPITALIZE_symmTensor SymmTensor
#define CAPITALIZE_tensor Tensor

#define FOR_ALL_FIELD_TYPES(Macro, ...)                                        \
    Macro(scalar, __VA_ARGS__)                                                 \
    Macro(vector, __VA_ARGS__)                                                 \
    Macro(sphericalTensor, __VA_ARGS__)                                        \
    Macro(symmTensor, __VA_ARGS__)                                             \
    Macro(tensor, __VA_ARGS__)

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#endif

// ************************************************************************* //

What really makes me mazed is "Macro" function used in the definition of "FOR_ALL_FIELD_TYPES" .
I tried to search what does "Macro" means with grep utility, but i have not found anything helpful.

Does anyone knows anything about those "FOR_ALL_FIELD_TYPES" and "Macro" functions?

[zjuliu]

My understanding. According to the Macro syntax， ‘Macro’ is the first parameter of FOR_ALL_TYPE_FIELD, which is also a function name because it puts before (). For example, the 'Macro' is 'makePatchFieldTypeName', then FOR_ALL_TYPE_FIELD means makePatchFieldTypeName(scalar, __VA_ARGS__)
makePatchFieldTypeName(vector, __VA_ARGS__) ...