Re: Checking type of userdata in C++

["Zé Pedro" <zarroba@...>]

I don't think I made myself clear. What happens is that the function in C++ that is called from lua can receive different types of userdata. When I do luaL_checkudata I have to say what kind of userdata I'm going to read. What I want to do is to check what kind of userdata was sent from Lua. 

thanks,
Zé Pedro

On 2/2/07, Rici Lake <lua@ricilake.net> wrote:

On 2-Feb-07, at 12:20 PM, Zé Pedro wrote:

> Sorry I've sent the message unfinished...
>
> Hi, I have a method in C++ accessible from Lua that receives an
> userdata object as a parameter. But it can receive one of several
> userdata types.If I could get the string that I used when the
> metatable was created (luaL_newmetatable(pLuaState, " Zara.sound");) I
> could compare it, but I can't find a way to do it.

At the risk of being obvious:

int my_newmetatable (lua_State *L, const char *tname) {
   int rc = luaL_newmetatable(L, tname);
   if (rc) {
     lua_pushstring(L, tname);
     lua_setfield(L, -2, "__typename");
   }
   return rc;
}

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