Please add support for Serialization of Fortran classes, and subroutine arguments declared `intent(in)`.

[robgpita]

The non-descriptive error message :

SENA-shallow-water/build/src/fortran/serialbox_pp/module_shallow_water_model.f90:341:74:

  341 |     call fs_read_field(ppser_serializer_ref, ppser_savepoint, 'b', this%b)
      |                                                                          1
Error: There is no specific subroutine for the generic 'fs_read_field' at (1)

Displays when trying to Serialize data as part of a Fortran class - class(shallow_water_model_type), intent( in) :: this.

As well as when trying to serialize data passed as Fortran subroutine arguments declared intent(in)

SENA-shallow-water/build/src/fortran/serialbox_pp/module_shallow_water_model.f90:344:73:

  344 |     call fs_read_field(ppser_serializer_ref, ppser_savepoint, 'xps', xps)
      |                                                                         1
Error: There is no specific subroutine for the generic 'fs_read_field' at (1)

Steps to Reproduce:
clone SENA-shallow-water repository
Insert Serialbox directives into subroutines adv_nsteps_model, update_interior_model, or update_boundaries_model (within module_shallow_water_model.f90)
Build the code following README.md or build.sh

[havogt]

Thanks for your report. Unfortunately, we cannot easily invest resources to fix problems appearing in codes outside of our collaborations.

However, this is an open source project and we happily take contributions to improve Serialbox (after signing the contributor agreement).

Alternatively, it might increase the chance to get a fix if you provide a minimal standalone example that reproduces the issue (stackoverflow style https://stackoverflow.com/help/minimal-reproducible-example).