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Ruby Programming
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Evaluating Ruby Expressions in C

If you are in the middle of some C code and you want to run an arbitrary Ruby expression without writing a bunch of C, you can always use the C version of eval. Suppose you have a collection of objects that need to have a flag cleared.

rb_eval_string("anObject.each{|x| x.clearFlag }");

If you just want to call a particular method (which is cheaper than eval-ing an entire string) you can use

rb_funcall(receiver, method_id, argc, ...)

Full descriptions of these and other commonly used C functions begin on page 186.
Ruby Programming
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