Heterogeneous list

[FedericoPerini]

@certik

Can you give an example?

I believe this is an example of that concept:

Attempting type erasure in Fortran

Nice example! with the caveat that all shapes have the same interface, I think you can remove most of the boilerplate using a hybrid of your first and last approaches: module shapes use iso_fortran_env implicit none private type, public, abstract :: shape_base contains procedure(shape_base_draw), deferred :: draw procedure(shape_base_ser), deferred :: serialize end type shape_base type, public, extends(shape_base) :: shape class(shape_base), alloca…