Re: The Lua C API

["J. Perkins" <jason@...>]

Jens Wessling wrote:
> The only thing I have to do to export a function to Lua is 
> to preface it with LUA_EXPORT.  This is #defined as 
> __declspec(__dllexport)
>
> Which, when you are using VC++ means to put the function 
> declaration in the export table.
>
> I then parse the binary image of the executable at run time 
> and extract all of the functions that are exported, demangle 
> their names, and use this information, not only to call the 
> C++ function from Lua, but to insure they are called in a 
> type-safe way, even for userdata/void* data.  This idea was
> first proposed and written by Scott Bilas.  For a good 
> reference, see FuBi at http://members.aa.net/~scottb/gdc/ .  


I have looked at that paper, but since I am working on multiple
platforms/compilers I'm not able to use the technique (or rather,
I didn't feel like making it work on other platforms). My macros
aren't really all that intrusive, I'll stick with them.

Did you figure out a solution to passing parameters by reference?
What would you do in the case of, say:

  void getWindowSize(int* width, int* height);

I've worked around this case so far by either rewriting the
function or adding special code to the wrapper, but a generic
transparent solution would be nice.

Jason