Bug 1344 – Can't set default value of an attribute in the derived class

Bug 1344 - Can't set default value of an attribute in the derived class


Summary:	Can't set default value of an attribute in the derived class

Status:	RESOLVED INVALID

Product:	ns-3
Classification:	Unclassified
Component:	core
Version:	ns-3.12
Hardware:	All All

Importance:	P5 normal
Assigned To:	Mathieu Lacage

URL:
Keywords:

Depends on:
Blocks:
	Show dependency tree / graph

Reported:	2012-01-16 08:42 UTC by Artem Krasilov
Modified:	2013-08-06 14:16 UTC (History)
CC List:	3 users (show)

See Also:

Attachments
the program representing bug (1.04 KB, text/x-c++src) 2012-01-16 08:42 UTC, Artem Krasilov	Details
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Description Artem Krasilov 2012-01-16 08:42:36 UTC

Created attachment 1307 [details]
the program representing bug

I have two inheriting classes: ns3::WifiMac and ns3::AdhocWifiMac. The parent class (ns3::WifiMac) has the attribute CtsTimeout. When I try to set default value of this attribute for ns3::AdhocWifiMac class (via Config::SetDefault) the program throws fatal error:  

msg="Could not set default value for ns3::AdhocWifiMac::CtsTimeout", file=../src/core/model/config.cc, line=613.

The program representing the error is in attachment. It should be mentioned the in ns-3.11 release it works fine.

It seems that the problem is that SetDefaultFailSafe method in src/core/model/config.cc file looks throw the atributes of the requested class only and does not look through it's parents atributes.

Comment 1 Tommaso Pecorella 2013-08-06 14:16:40 UTC

Attributes are not inherited by sub-classes. A sub-class might use a base class attribute though its accessors, however this does not mean that the attribute is owned by the sub-class.

Attributes *must* be set in the class they are defined. In this case ns3::WifiMac.