About Resolvable::Kind

The type of a Resolvables Kind is now available as

Resolvable::Kind

The former class ResKind was removed.

ResTraits<Resolvable> (in case you use them) provides it (the type) as ResTraits<Resolvable>::KindType. The sole definition of a resolvables kind as string is ResTraits<RESOLVABLETYPE>::_kind. Of course ther's no ResTraits<Resolvable>::_kind nor ResTraits<ResObject>::_kind, as they are just base classes. Classes derived from ResObject have _kind defined.

Resolvable::Kind is to be used like ResKind was. Just the conversion operator into std::string was removed. If you happen to need the string representation, use the asString() method.

Why?

We have (and will have) several other Kinds: Kind of Resolvable, Kind of Capability; Kind of Source ..

The implementation as KindOf<type> takes care that all Kind types behave the same way, although they are different types.

Implementation will be refined to associate a number with each Kind string. The numerical value will allow to use switches on kinds, instead of if/elseif/else cascades doing string comparison.

The numerical value might become a bit. This would enable us to OR the kind values:

ResTraits<Package>::_kind | ResTraits<Patch>::_kind

(maybe a bit more convenient syntax)

~ ResTraits<Source>::_kind

This might be usefull in queries like 'search patch or package providing Foo' or 'search for ... but not as Product' or 'get capabilities except FileCaps '.

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Last edit in Trac '11/22/05 11:23:10' by 'kkaempf'

Libzypp/Design/Resolvable/Kind

About Resolvable::Kind