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High level programming in C: Data Structures

[ This should go in a separate CS.txt log. ]

What I miss most in C are closures and directed acyclic datatypes.
This made me think a bit about different classes of data structures in
a C program.  In a dynamic language with GC these all tend to blend.


1.  Linear types (pure trees): every object has a single reference,
    which could be implemented as embedded structs (C struct
    inheritance) or embedded struct pointers (C struct delegation).

2.  Directed acyclic graphs: objects can have multiple references, but
    there are no loops.  Reference counting works here.

3.  General graphs: If there are circular references, reference counts
    won't work: you need to build "intelligent" constructors /
    destructors for the whole graph.



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