C++ evaluate function... or something

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Hey, I'm in the process of writing an .oct file, and I can't figure
out how to call functions as I would with input to octave's shell.  
I have .m files with functions that I need to call and get return
values from, all while inside my .oct function.  So I'm looking
for something that probably takes in a formatted string (containing
regular octave-ese), evaluates it, and gives the return value.
Does this function exists?

thanks.

BTW: is there somewhere this is documented along with answers
to my next questions?


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