Pure virtual function call in think function

OneManArmy · 08-18-2012, 01:16 AM

I'm just started with modding and C++ in general (I'm experienced at Java though) and I decided to make pistol shoot in short bursts.
To do this I've defined a function BurstThink (the right word would be copied from CHLSelectFireMachineGun), which calls BaseClass::PrimaryAttack() and reschedules itself if the burst size is not exceeded. I've properly declared this function in DATADESC, however as soon as I press mouse button with pistol equipped I get strange error "Pure virtual function call". Unfortunately there was notthing like good old Java stacktrace, so I could not pinpoint the cause.

OneManArmy · 08-18-2012, 01:19 AM

Here is the code http://pastebin.com/W5aPVyBw

zombie@computer · 08-18-2012, 12:13 PM

check here for debugging: https://developer.valvesoftware.com/...he_Source_Code

you know what a pure virtual function call is? its this

http://www.artima.com/cppsource/pure_virtual.html

OneManArmy · 08-18-2012, 01:57 PM

Yes, I'm aware of what is the pure virtual function. The thing is I don't know how to fix this. As far as I can tell the error occurs when BaseClass::PrimaryAttack() is executed from within think function when I set it up as a think function. When I call it directly everything is OK. So it seems that reference to BaseClass is invalid within think context. That said I don't even know where to start looking for the solution

zombie@computer · 08-19-2012, 01:28 AM

As far as i can tell (using google one can apparently find most of the hl2 source code, odd...) CBaseHL2MPCombatWeapon has no PrimaryAttack defined (its only declared) which would explain this behaviour. I dont know why calling it outside the think apparently works for you.

08-18-2012, 01:16 AM	#1
OneManArmy Join Date: Apr 2008 Reputation: 0 Posts: 339	Pure virtual function call in think function I'm just started with modding and C++ in general (I'm experienced at Java though) and I decided to make pistol shoot in short bursts. To do this I've defined a function BurstThink (the right word would be copied from CHLSelectFireMachineGun), which calls BaseClass::PrimaryAttack() and reschedules itself if the burst size is not exceeded. I've properly declared this function in DATADESC, however as soon as I press mouse button with pistol equipped I get strange error "Pure virtual function call". Unfortunately there was notthing like good old Java stacktrace, so I could not pinpoint the cause.

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08-18-2012, 01:19 AM	#2
OneManArmy Join Date: Apr 2008 Reputation: 0 Posts: 339	Here is the code http://pastebin.com/W5aPVyBw

08-18-2012, 12:13 PM	#3
zombie@computer Join Date: Aug 2008 Reputation: 416 Posts: 908	check here for debugging: https://developer.valvesoftware.com/...he_Source_Code you know what a pure virtual function call is? its this http://www.artima.com/cppsource/pure_virtual.html

08-18-2012, 01:57 PM	#4
OneManArmy Join Date: Apr 2008 Reputation: 0 Posts: 339	Yes, I'm aware of what is the pure virtual function. The thing is I don't know how to fix this. As far as I can tell the error occurs when BaseClass::PrimaryAttack() is executed from within think function when I set it up as a think function. When I call it directly everything is OK. So it seems that reference to BaseClass is invalid within think context. That said I don't even know where to start looking for the solution

08-19-2012, 01:28 AM	#5
zombie@computer Join Date: Aug 2008 Reputation: 416 Posts: 908	As far as i can tell (using google one can apparently find most of the hl2 source code, odd...) CBaseHL2MPCombatWeapon has no PrimaryAttack defined (its only declared) which would explain this behaviour. I dont know why calling it outside the think apparently works for you.