Re: Can I bind a function with callback to lua?

["Ashwin Hirschi" <deery@...>]

> I'm a novice here. I got a problem that I want to binding a c function with callback (function pointer) to lua.The function is first-class type in lua but it does not the same in c. Have a look of the source:
>
>   // code in c
>   void repeat(int time,int (*call)())
>   {
>      int i;
>     for (i=0;i<time;i++) call();
>   }
>
>   -- code in lua
>   function sayhello() print("Hello!\n") end
>
>   repeat(10,sayhello)  -- print "Hello!" 10 times

You could try something like this [untested!] fragment:

	int my_silly_repeat(lua_State *L)
	{
		int repeat = lua_tonumber(L, 1);
		int i;

		for (i = 0; i < repeat; ++i)
		{
			lua_pushvalue(L, 2);
			lua_call(L, 0, 0);
		}

		return 0;
	}

	lua_register(L, "repeat", my_silly_repeat);

Note that I changed the signature of the repeat function to allow it to be called directly from Lua.

Ashwin.
--
no signature is a signature.