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Wed Dec 7 00:55:14 EST 2011

Just structuring of representation (<-> representation of structuring)

I separated operations on structuring of representation (ras) and
those that work both on ras and representation of structuring (r as).
The latter are only used in Loop (packing/unpacking in _app and
_lambda), and it seems that Sys only need to know StructComp.

    class StructComp stx ras | ras -> stx where
      -- Support for compilation: nb of atomic elements, typed variable
      -- creation, and compilation to flat syntax type.  To select the
      -- right type, pass (undefined :: <type>) for the first arg.
      structSize      :: ras -> Int
      structVariables :: ras -> [VarName] -> (ras, [VarName])
      structCompile   :: ras -> [stx]


    class StructComp stx ras => 
          Struct stx r as ras | ras -> r as, r as -> ras, r -> stx where

      -- Commute representation and data structuring, 
      -- i.e. (r a, (r b, r c)) <-> r (a,(b,c))
      structPack   :: ras -> r as
      structUnpack :: r as -> ras

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