// Starting with 5.1 the auxlib version of checkudata throws an exception if the type isn't right
// Instead, we want to run our own version that checks the type and just returns null for failure
private static IntPtr checkudata_raw(LuaCore.lua_State L, int ud, string tname)
{
var p = LuaCore.lua_touserdata(L, ud);
if (p != IntPtr.Zero)
{
/* value is a userdata? */
if (LuaCore.lua_getmetatable(L, ud) != 0)
{
bool isEqual;
/* does it have a metatable? */
LuaCore.lua_getfield(L, (int)LuaIndexes.Registry, tname); /* get correct metatable */
isEqual = LuaCore.lua_rawequal(L, -1, -2) != 0;
// NASTY - we need our own version of the lua_pop macro
// lua_pop(L, 2); /* remove both metatables */
LuaCore.lua_settop(L, -(2) - 1);
if (isEqual) /* does it have the correct mt? */
{
return(p);
}
}
}
return(IntPtr.Zero);
}
public static int lua_getmetatable(LuaCore.lua_State luaState, int objIndex)
{
return(LuaCore.lua_getmetatable(luaState, objIndex));
}