funcidx("OnPlayerCommandReceived") != -1; Whats != -1 for?

funcidx("OnPlayerCommandReceived") != -1; Whats != -1 for? - Printable Version

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+--- Thread: funcidx("OnPlayerCommandReceived") != -1; Whats != -1 for? (/showthread.php?tid=338821)

funcidx("OnPlayerCommandReceived") != -1; Whats != -1 for? - iggy1 - 01.05.2012

Hello i was looking through zcmd and came across this code.

pawn Код:

zcmd_g_HasOPCS = funcidx("OnPlayerCommandReceived") != -1;

To me that translates to "zcmd_g_HasOPCS" equals "funcidx("OnPlayerCommandReceived")" doesn't equal -1.

I just don't understand what it is for

i have noticed it in a few other incs too.

I never do this when hooking callbacks. I do use funcidx to check if a func exists but never with -1 after it (when assigning to a var). I'm thinking maybe i should do it this way since all the experienced/pro coders use it.

Is this really necessary? And why?

I've just been doing this.

pawn Код:

g_HasORIL = funcidx("OnRetrieveIpLocation");

Thanks.

Re: funcidx("OnPlayerCommandReceived") != -1; Whats != -1 for? - zSuYaNw - 01.05.2012

This not necessary,
because this function (funcidx) return's the return of function..

Exemple:

pawn Код:

printf("%d",funcidx("MyPublic"));


MyPublic(); public MyPublic()
{
    return 1;
}

Show's "1".

Re: funcidx("OnPlayerCommandReceived") != -1; Whats != -1 for? - iggy1 - 01.05.2012

It actually returns the index of a function. -1 if the func doesn't exist.

I understand why i would see this code.

pawn Код:

if(funcidx("iploc_OnGameModeInit") != -1)

But not when assigning to a var

pawn Код:

zcmd_g_HasOPCS = funcidx("OnPlayerCommandReceived") != -1;

Re: funcidx("OnPlayerCommandReceived") != -1; Whats != -1 for? - zSuYaNw - 01.05.2012

for locate value ...?

Re: funcidx("OnPlayerCommandReceived") != -1; Whats != -1 for? - [HiC]TheKiller - 01.05.2012

That value is assigned to increase the speed on OnPlayerCommandText. Setting zcmd_g_HasOPCS on OnFilterScriptInit / OnGameModeInit only has to be called once rather than multiple times.

Re: funcidx("OnPlayerCommandReceived") != -1; Whats != -1 for? - iggy1 - 01.05.2012

Quote:

Originally Posted by ******

When you're not sure what an expression does, add the brackets that are implicit in operator precedence:
...
zcmd_g_HasOPCS = (42 != -1);
...

Thanks if i had thought of the funcidx call as a number instead of a function i would have got that. I get it now thanks.

@ Killer i get why it's assigned just didn't get the "!= -1" part. Thanks for reply

Re: funcidx("OnPlayerCommandReceived") != -1; Whats != -1 for? - Dude_Lebowski - 01.05.2012

omg sounds complicated