ValueTransform.h

Go to the documentation of this file.

/*---------------------------------------------------------------------\
|                          ____ _   __ __ ___                          |
|                         |__  / \ / / . \ . \                         |
|                           / / \ V /|  _/  _/                         |
|                          / /__ | | | | | |                           |
|                         /_____||_| |_| |_|                           |
|                                                                      |
\---------------------------------------------------------------------*/
#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
    {
      using RawType = Tp;
      using Transformator = TUnaryFunction;
#if __cplusplus < 201703L
      using TransformedType = std::result_of_t<Transformator (RawType)>; // yast in 15.[23] uses c++11
#else
      using TransformedType = std::invoke_result_t<Transformator, RawType>;
#endif
 
    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
    {
      using Container = TContainer;
      using Transformator = TUnaryFunction;
      using size_type = typename Container::size_type;
      using RawType = typename Container::value_type;
#if __cplusplus < 201703L
      using TransformedType = std::result_of_t<Transformator (RawType)>; // yast in 15.[23] uses c++11
#else
      using TransformedType = std::invoke_result_t<Transformator, RawType>;
#endif
    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(); }
 
      using RawConstIterator = typename Container::const_iterator;
 
      RawConstIterator rawBegin() const
      { return _raw.begin(); }
 
      RawConstIterator rawEnd() const
      { return _raw.end(); }

      const Container & raw() const
      { return _raw; }

      Container & raw()
      { return _raw; }

      void clear()
      { _raw.clear(); }
 
    public:
      using TransformedConstIterator = transform_iterator<Transformator, typename Container::const_iterator>;
 
      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