BOLTStack.Lua.luaL_checkudata C# (CSharp) Method

        public static extern IntPtr luaL_checkudata(
            IntPtr luaState,
            int ud,
            string tname);

        public static int GetIndex(IntPtr luaState)
        {
            var instancePointer = Lua.luaL_checkudata(luaState, 1, _typeFullName);
            var instanceIndex   = new IntPtr(Marshal.ReadInt32(instancePointer));

            return(instanceIndex.ToInt32());
        }