Calling a function pointer with dynamic arguments

Question

I've obtained a function pointer at run-time, let's say through something like GetProcAddress (so a weakly-typed void*), and then I've got this metadata that tells me what the function's signature is at run-time. How can I call the function correctly, preferably in Standard code? C++0x solution is fine, and I don't mind having to enforce my own type-safety.

I know seems redudant, but, its the destination function in a shared object / dynamic library, or its the same program ? — umlcat
– umlcat, Commented Jun 22, 2011 at 15:03

Armen Tsirunyan · Accepted Answer · 2011-06-22 14:48:38Z

1

Er... no, you can't. There is no thing like reflection is C++ or C++0x, you can't get a type out of a string or whatever. Unfortunately :)

answered Jun 22, 2011 at 14:48

Armen Tsirunyan

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3 Comments

JAB Over a year ago

If there are limits to the function signatures, though, and he knows what the specific possibilities are, couldn't he parse the metadata and cast the function pointer to a specific (possibly overloaded) function based on that?

Puppy Over a year ago

@JAB: I'd have to generate all possible overloads before-hand, which could be millions of permutations or more.

DangerMouse Over a year ago

It is possible to do - that's what Excel does when it calls XLLs. But you might need to resort to assembler to do it.

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