ValueTransform.h

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#ifndef ZYPP_BASE_VALUETRANSFORM_H
#define ZYPP_BASE_VALUETRANSFORM_H
 
#include <iosfwd>
 
#include <zypp/base/Iterator.h>
 
namespace zypp
{
  namespace base
  {
    template<class Tp, class TUnaryFunction>
    struct ValueTransform
    {
      typedef Tp RawType;
      typedef TUnaryFunction Transformator;
      typedef typename std::result_of<Transformator(RawType)>::type TransformedType;
 
    public:
      ValueTransform()
      {}
 
      explicit ValueTransform( RawType raw_r )
      : _raw( std::move(raw_r) )
      {}
 
      ValueTransform( RawType raw_r, Transformator transform_r )
      : _raw( std::move(raw_r) ), _transform( std::move(transform_r) )
      {}
 
    public:
      const RawType & raw() const
      { return _raw; }
 
      RawType & raw()
      { return _raw; }
 
    public:
      TransformedType transformed() const
      { return _transform( _raw ); }
 
      TransformedType transformed( const RawType & raw_r ) const
      { return _transform( raw_r ); }
 
      const Transformator & transformator() const
      { return _transform; }
 
    private:
      RawType _raw;
      Transformator _transform;
    };
 
    template<class TContainer, class TUnaryFunction>
    struct ContainerTransform
    {
      typedef TContainer Container;
      typedef TUnaryFunction Transformator;
      typedef typename Container::size_type size_type;
      typedef typename Container::value_type RawType;
      typedef typename std::result_of<Transformator(RawType)>::type TransformedType;
 
    public:
      ContainerTransform()
      {}
 
      explicit ContainerTransform( Container raw_r )
      : _raw( std::move(raw_r) )
      {}
 
      ContainerTransform( Container raw_r, Transformator transform_r )
      : _raw( std::move(raw_r) ), _transform( std::move(transform_r) )
      {}
 
    public:
      bool empty() const
      { return _raw.empty(); }
 
      size_type size() const
      { return _raw.size(); }
 
      typedef typename Container::const_iterator RawConstIterator;
 
      RawConstIterator rawBegin() const
      { return _raw.begin(); }
 
      RawConstIterator rawEnd() const
      { return _raw.end(); }
 
      const Container & raw() const
      { return _raw; }
 
      Container & raw()
      { return _raw; }
 
    public:
      typedef transform_iterator<Transformator, typename Container::const_iterator> TransformedConstIterator;
 
      TransformedConstIterator transformedBegin() const
      { return make_transform_iterator( _raw.begin(), _transform ); }
 
      TransformedConstIterator transformedEnd() const
      { return make_transform_iterator( _raw.end(), _transform ); }
 
      Container transformed() const
      { return Container( transformedBegin(), transformedEnd() ); }
 
      TransformedType transformed( const RawType & raw_r ) const
      { return _transform( raw_r ); }
 
      TransformedType transformed( const RawConstIterator & rawIter_r ) const
      { return _transform( *rawIter_r ); }
 
      const Transformator & transformator() const
      { return _transform; }
 
    private:
      Container _raw;
      Transformator _transform;
    };
 
  } // namespace base
} // namespace zypp
#endif // ZYPP_BASE_VALUETRANSFORM_H