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On Feb 02, 2005, at 14:45, Michael Cumming wrote:

Adam, Rici,

Thank you for the replys... so a quick guess at the code would be...

if (lua_isfunction (L,1)) // we have a function

   luacallbackfunction = luaL_ref(L, LUA_REGISTRYINDEX);

When I want to use the function I can do

lua_rawgeti(L, LUA_REGISTRYINDEX, luacallbackfunction);
lua_pushxxx for the params

lua_pcall (xxx)

Looks about right.

By the way, since tables and userdata can also be called if they have the correct metamethod then it is bad practice to use lua_isfunction to test if a value is callable. I might, quite reasonably, pass in a "function" that was in fact a userdata that implemented the __call metamethod and your code would barf. On the other hand, I appreciate that you would like _some_ sanity check.

David Jones