Working with StablePtr

[W4RH4WK]

This package is great, it really makes working with structs over the FFI easier. In my use-case I want to put a StablePtr inside a struct and return the struct over the FFI. Unfortunately this does not work, as StablePtr a does not instantiate Generic. It results in the following error message if want to create an (orphan) instance.

instance CStorable (StablePtr a)

    /home/alex/allscale/insieme/code/analysis/src/cba/haskell/insieme-hat/src/Insieme/Adapter.hs:253:10: error:
        • No instance for (Generic (StablePtr a))
            arising from a use of ‘c-storable-deriving-0.1.2:Foreign.CStorable.TypeClass.$dmcPeek’
        • In the expression:
            c-storable-deriving-0.1.2:Foreign.CStorable.TypeClass.$dmcPeek
              @StablePtr a
          In an equation for ‘cPeek’:
              cPeek
                = c-storable-deriving-0.1.2:Foreign.CStorable.TypeClass.$dmcPeek
                    @StablePtr a
          In the instance declaration for ‘CStorable (StablePtr a)’

Since Ptr a is an instance of Generic I can cast the StablePtr Ctx.Context to Ptr () and us this as a workaround.

Do you have an idea how I could get a StablePtr into my struct?

[W4RH4WK]

Just saw your TODO note in the source file.