include/basebmp/accessor.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #ifndef INCLUDED_BASEBMP_ACCESSOR_HXX
  21 #define INCLUDED_BASEBMP_ACCESSOR_HXX
  22
  23 #include <vigra/numerictraits.hxx>
  24
  25 namespace basebmp
  26 {
  27
  28 /** Standard accessor type
  29
  30     Accesses the iterator values the standard way (i.e. via
  31     *operator()/operator[])
  32  */
  33 template<typename ValueType> class StandardAccessor
  34 {
  35 public:
  36     typedef ValueType value_type;
  37
  38     // -------------------------------------------------------
  39
  40     template< class Iterator >
  41     value_type operator()(Iterator const& i) const
  42     {
  43         return *i;
  44     }
  45
  46     template< class Iterator, class Difference >
  47     value_type operator()(Iterator const& i, Difference const& diff) const
  48     {
  49         return i[diff];
  50     }
  51
  52     // -------------------------------------------------------
  53
  54     template< typename V, class Iterator >
  55     void set(V const& value, Iterator const& i) const
  56     {
  57         *i = vigra::detail::RequiresExplicitCast<value_type>::cast(value);
  58     }
  59
  60     template< typename V, class Iterator, class Difference >
  61     void set(V const& value, Iterator const& i, Difference const& diff) const
  62     {
  63         i[diff] = vigra::detail::RequiresExplicitCast<value_type>::cast(value);
  64     }
  65 };
  66
  67 //-----------------------------------------------------------------------------
  68
  69 /** Non-standard accessor type
  70
  71     Uses getter/setter methods at the given iterator type, to access
  72     the underlying values.
  73  */
  74 template<typename ValueType> class NonStandardAccessor
  75 {
  76 public:
  77     typedef ValueType value_type;
  78
  79     // -------------------------------------------------------
  80
  81     template< class Iterator >
  82     value_type operator()(Iterator const& i) const
  83     {
  84         return i.get();
  85     }
  86
  87     template< class Iterator, class Difference >
  88     value_type operator()(Iterator const& i, Difference const& diff) const
  89     {
  90         return i.get(diff);
  91     }
  92
  93     // -------------------------------------------------------
  94
  95     template< typename V, class Iterator >
  96     void set(V const& value, Iterator const& i) const
  97     {
  98         i.set( vigra::detail::RequiresExplicitCast<value_type>::cast(value) );
  99     }
 100
 101     template< typename V, class Iterator, class Difference >
 102     void set(V const& value, Iterator const& i, Difference const& diff) const
 103     {
 104         i.set( vigra::detail::RequiresExplicitCast<value_type>::cast(value),
 105                diff );
 106     }
 107 };
 108
 109 } // namespace basebmp
 110
 111 #endif /* INCLUDED_BASEBMP_ACCESSOR_HXX */
 112
 113 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */