RE: Get the function value
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- Subject: RE: Get the function value
- From: RLake@...
- Date: Tue, 4 Sep 2001 11:47:09 -0500
Peter wrote:
> Interesting code.
> But what I want to do is keep the value, so I can issue a lua_call()
later
> on.
Ah, in that case, you need to stash a reference to the value somewhere:
static int setTimer(lua_State *L)
{
if ( lua_isnumber( L, 1 ) )
g_waitTime = lua_tonumber( L, 1 );
// lua_typename( L, lua_type( L, 2 ) )
// returns "function" which is what I want :)
lua_settop(L, 2); /* as before, zap extra args if any */
g_waitFnRef = lua_ref(L, 1); /* make sure to lock the reference */
return 0;
}
// and later on
static void doTimer(lua_State* L)
{
if (lua_getref(L, g_waitFnRef)) {
if (lua_call(L, 0, 9)) { /* need to be careful about errors
*/
// report an error, somehow
}
else {
// turns out the reference was never set
}
}
// and much later on
static void disposeTimer(lua_State* L)
{
lua_unref(L, g_waitFnRef);
g_waitFnRef = LUA_NOREF;
}
// make sure you initialise g_waitFnRef to LUA_NOREF, *not* to 0.
// Otherwise, you'll regret it. I did.
Rici
PD: I actually recommend not putting stuff like that in globals, since it
is relative to a lua_State. Using globals means that whatever you write
will only work in a single lua_State, which may prove limiting later on.
Also, I don't like globals. :-) However, the mechanics of that are too
large for the margins of this e-mail.
R.