I'm trying to find code examples but have been unsuccessful so far (I did find a couple of other gems I needed solutions for, heh) I'll keep looking, though.
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I am used to environments where the Perl code is either handing variant types across boundaries without the C++ code touching its contents, or loading the code directly into the existing engine space, so that direct calls are being made, without the scripts host needing to handle it at all.
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All of the perl "functions" we use are really just wrappers for the C++ functions. Once the C++ function is written, we then create the wrapper in zone/perlparser.cpp so the .pl scripts have access to it. In the end, it's C++ that is doing all of the work. This may not be the fastest method, but it is very effective for our needs. This situation affords us a powerful scripting language we can use to write quests, without requiring quest writers to know C++ or really, even Perl. I recommend browsing through the EQEmu source, specifically the zone/perl* files to truly understand how the system works.