[solved]What is tool class?

[OLLO]

I was reading "Qt Coding Conventions":http://qt-project.org/wiki/Coding-Conventions
and one thing confused me

• Things to avoid:
  Do not inherit from template/tool classes

What is tool class?

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Answer is "here":http://doc.qt.digia.com/qt/examples-tools.html :
[quote]Qt is equipped with a range of capable tool classes, from containers and iterators to classes for string handling and manipulation.
Other classes provide application infrastructure support, handling plugin loading and managing configuration files.[/quote]

[Wilk]

Hello.
I guess tool classes are QString, QVector and other containers, probably some other - classes, that are ready to use without any kind of extensions.

[lgeyer]

There is a rule of thumb: if it has a non-virtual destructor, don't inherit from it.

[OLLO]

[quote author="Lukas Geyer" date="1357403536"]There is a rule of thumb: if it has a non-virtual destructor, don't inherit from it.[/quote]

Of course it's in most cases it is very bad idea to inherit from class with non-virtual desctructor but question isn't about that. It's about term tool class