What are these expressions ?

[UncleAl]

I am just returning to C programming after a few years absence. Would appreciate your comments on the following two expressions which were passed as arguments in a function call:

(coordinate_set_t * )NULL,
(Line_t **) new_obj


Are the expressions in parentheses casts and was the type being casted defined in a typedef somewhere? Is it legal in ansi C to use a new type created in a typedef statement as a cast? Unfortunately this is part of a very large system and I have not yet found the prototype for the function and its arguments. Thanks.

 

[rbobbitt]

Yes, that's a cast, and it looks like it is defined in a typdef. I'm reasonably sure that Ansi C allows casts to typedefs, since a typedef is really just a synonym of sorts.

Can't you just do a quick search through all the source files to find the definitions?

Russ
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