safer ptr_remove function

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safer ptr_remove function #299459 11/24/09 07:31 11/24/09 07:31
Joined: Feb 2006 Posts: 1,011 Germany pegamode OP Serious User
pegamode OP Serious User Joined: Feb 2006 Posts: 1,011 Germany	Hi, I'd like to have a safer ptr_remove function, so I wrote this code: Code: void _ptr_remove(void* ptr) { if (ptr != NULL) { ptr_remove(ptr); ptr = NULL; } } Is this the right way to do this? I'd prefer this as a makro, but the following code gives me a syntax error: Code: #define _ptr_remove(ptr) if(ptr) { ptr_remove(ptr); ptr=NULL; } Is there any chance to get it defined as a makro? Regards, Pegamode. Meteor Mess 3D: https://www.meteormess.de Facebook: https://www.facebook.com/MeteorMess3D Twitter: http://www.twitter.com/MeteorMess3D Discord: https://discord.gg/naJJgdMQDV

Re: safer ptr_remove function [Re: pegamode] #299460 11/24/09 07:36 11/24/09 07:36
Joined: Oct 2007 Posts: 5,211 Ä°stanbul, Turkey Quad Senior Expert
Quad Senior Expert Joined: Oct 2007 Posts: 5,211 Ä°stanbul, Turkey	#define ptr_kill(ptr) if(ptr) ptr_remove(ptr); ptr=NULL that should do it. btw, why do you need to do that? if you pass a null pointer to ptr_remove nothing happens? Last edited by Quadraxas; 11/24/09 07:39. 3333333333

Re: safer ptr_remove function [Re: Quad] #299463 11/24/09 07:48 11/24/09 07:48
Joined: Feb 2006 Posts: 1,011 Germany pegamode OP Serious User
pegamode OP Serious User Joined: Feb 2006 Posts: 1,011 Germany	I'd like to have a way to check if the pointer was already removed. The following code would crash: Code: ptr_remove(ptr); ptr_remove(ptr); Meteor Mess 3D: https://www.meteormess.de Facebook: https://www.facebook.com/MeteorMess3D Twitter: http://www.twitter.com/MeteorMess3D Discord: https://discord.gg/naJJgdMQDV

Re: safer ptr_remove function [Re: pegamode] #299465 11/24/09 07:52 11/24/09 07:52
Joined: Jul 2000 Posts: 28,094 Frankfurt jcl Chief Engineer
jcl Chief Engineer Joined: Jul 2000 Posts: 28,094 Frankfurt	The best way is a macro. If you want to use a function, it must look like this: void _ptr_remove(void** ptr) { if (ptr) { ptr_remove(ptr); *ptr = NULL; } } ... _ptr_remove(&ptr); ...

Re: safer ptr_remove function [Re: jcl] #299470 11/24/09 07:56 11/24/09 07:56
Joined: Feb 2006 Posts: 1,011 Germany pegamode OP Serious User
pegamode OP Serious User Joined: Feb 2006 Posts: 1,011 Germany	I'd prefer a makro, too. Is the code Quadraxas postet ok? Code: #define ptr_kill(ptr) if(ptr) ptr_remove(ptr); ptr=NULL Meteor Mess 3D: https://www.meteormess.de Facebook: https://www.facebook.com/MeteorMess3D Twitter: http://www.twitter.com/MeteorMess3D Discord: https://discord.gg/naJJgdMQDV

Re: safer ptr_remove function [Re: pegamode] #299473 11/24/09 08:40 11/24/09 08:40
Joined: Jul 2000 Posts: 28,094 Frankfurt jcl Chief Engineer
jcl Chief Engineer Joined: Jul 2000 Posts: 28,094 Frankfurt	Yes, but you don't even need the if part. #define ptr_kill(ptr) ptr_remove(ptr); ptr=NULL

Re: safer ptr_remove function [Re: jcl] #299474 11/24/09 08:51 11/24/09 08:51
Joined: Feb 2006 Posts: 1,011 Germany pegamode OP Serious User
pegamode OP Serious User Joined: Feb 2006 Posts: 1,011 Germany	Ok ... thanks for your replies. Regards, Pegamode. Meteor Mess 3D: https://www.meteormess.de Facebook: https://www.facebook.com/MeteorMess3D Twitter: http://www.twitter.com/MeteorMess3D Discord: https://discord.gg/naJJgdMQDV

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