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(g-wrap.info)C code needed for adding new types

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C code needed for adding new types
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When you add a new type to the interpreter, you will need to supply the
names of three functions.  One function prints a representation of an
object of that type, another is called to deallocate the object when it
is garbage-collected, and the third is called to compare two objects of
that type for equality.

Utility functions

Printing object representations

Function for deallocating an object

Function for object comparisons