Mailinglist Archive: zypp-devel (227 mails)

[Michael Andres <ma@xxxxxxx>]

I just added a class SolvIterMixin (zypp/sat/SolvIterMixin.h).

Classes providing a sat::Solvable iterator - i.e methods begin() and end() 
returning an iterator pointing to sat::Solvable - may derive from it to 
add additional iterators. by now:

    // value_type sat::Solvable (the same as the derived class' begin/end)
    Solvable_iterator solvableBegin() const
    Solvable_iterator solvableEnd() const

    // value_type PoolItem
    PoolItem_iterator poolItemBegin() const
    PoolItem_iterator poolItemEnd() const

    // value_type ui::Selectable::Ptr
    Selectable_iterator selectableBegin() const
    Selectable_iterator selectableEnd() const

(The Selectable_iterator will soon be enhanced to avoid multiple visits of 
 the same Selectable, because multiple Solvables/PoolItems refer to the 
 same Selectable.)

The intention is that all classes providing a collection of solvables 
(Queries, Pattern/Patch contents, ...) offer this interface.


To use SolvIterMixin derive from it and pass the class and the iterator 
type as template argument:

     *     namespace detail
     *     {
     *       class WhatProvidesIterator;
     *     }
     *
     *     class WhatProvides 
     *     : public SolvIterMixin<WhatProvides,detail::WhatProvidesIterator>
     *     {
     *       public:
     *         typedef detail::WhatProvidesIterator const_iterator;
     * 
     *         // Iterator pointing to the first Solvable.
     *         const_iterator begin() const;
     * 
     *         // Iterator pointing behind the last Solvable.
     *         const_iterator end() const;
     * 
     *     };



@PoolQuery: The Mixin requires begin/end being const methods, and the 
ResultIterator must be defined outside class PoolQuery. Once this is 
fixed, PoolQuery could add the SolvIterMixin interface.

-- 

cu,
    Michael Andres

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Michael Andres             YaST Development            ma@xxxxxxxxxx
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