RE: How to pass table
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- Subject: RE: How to pass table
- From: "Jerome Vuarand" <jerome.vuarand@...>
- Date: 2008年2月15日 17:27:03 -0500
Dive Florida wrote:
> Could you please tell me how to write a non-throwing function
> luaL_isudata? I'm thinking about using:
>
> void luaL_checktype (lua_State *L, int narg, int t);
Here is an implementation based on luaL_checkudata:
LUALIB_API int luaL_isudata (lua_State *L, int ud, const char *tname) {
if (lua_isuserdata(L, ud)) { /* value is a userdata? */
if (lua_getmetatable(L, ud)) { /* does it have a metatable? */
int equal;
lua_getfield(L, LUA_REGISTRYINDEX, tname); /* get correct
metatable */
equal = lua_rawequal(L, -1, -2); /* does it have the correct mt?
*/
lua_pop(L, 2); /* remove both metatables */
return equal;
}
}
return 0; /* else false */
}
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