xref: /aoo42x/main/basebmp/inc/basebmp/accessor.hxx (revision 48cdb363)
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23cdf0e10cSrcweir 
24cdf0e10cSrcweir #ifndef INCLUDED_BASEBMP_ACCESSOR_HXX
25cdf0e10cSrcweir #define INCLUDED_BASEBMP_ACCESSOR_HXX
26cdf0e10cSrcweir 
27cdf0e10cSrcweir #include <vigra/numerictraits.hxx>
28cdf0e10cSrcweir 
29cdf0e10cSrcweir namespace basebmp
30cdf0e10cSrcweir {
31cdf0e10cSrcweir 
32cdf0e10cSrcweir /** Standard accessor type
33cdf0e10cSrcweir 
34cdf0e10cSrcweir     Accesses the iterator values the standard way (i.e. via
35cdf0e10cSrcweir     *operator()/operator[])
36cdf0e10cSrcweir  */
37cdf0e10cSrcweir template<typename ValueType> class StandardAccessor
38cdf0e10cSrcweir {
39cdf0e10cSrcweir public:
40cdf0e10cSrcweir     typedef ValueType value_type;
41cdf0e10cSrcweir 
42cdf0e10cSrcweir     // -------------------------------------------------------
43cdf0e10cSrcweir 
44cdf0e10cSrcweir     template< class Iterator >
operator ()(Iterator const & i) const45cdf0e10cSrcweir     value_type operator()(Iterator const& i) const
46cdf0e10cSrcweir     {
47cdf0e10cSrcweir         return *i;
48cdf0e10cSrcweir     }
49cdf0e10cSrcweir 
50cdf0e10cSrcweir     template< class Iterator, class Difference >
operator ()(Iterator const & i,Difference const & diff) const51cdf0e10cSrcweir     value_type operator()(Iterator const& i, Difference const& diff) const
52cdf0e10cSrcweir     {
53cdf0e10cSrcweir         return i[diff];
54cdf0e10cSrcweir     }
55cdf0e10cSrcweir 
56cdf0e10cSrcweir     // -------------------------------------------------------
57cdf0e10cSrcweir 
58cdf0e10cSrcweir     template< typename V, class Iterator >
set(V const & value,Iterator const & i) const59cdf0e10cSrcweir     void set(V const& value, Iterator const& i) const
60cdf0e10cSrcweir     {
61cdf0e10cSrcweir         *i = vigra::detail::RequiresExplicitCast<value_type>::cast(value);
62cdf0e10cSrcweir     }
63cdf0e10cSrcweir 
64cdf0e10cSrcweir     template< typename V, class Iterator, class Difference >
set(V const & value,Iterator const & i,Difference const & diff) const65cdf0e10cSrcweir     void set(V const& value, Iterator const& i, Difference const& diff) const
66cdf0e10cSrcweir     {
67cdf0e10cSrcweir         i[diff] = vigra::detail::RequiresExplicitCast<value_type>::cast(value);
68cdf0e10cSrcweir     }
69cdf0e10cSrcweir };
70cdf0e10cSrcweir 
71cdf0e10cSrcweir //-----------------------------------------------------------------------------
72cdf0e10cSrcweir 
73cdf0e10cSrcweir /** Non-standard accessor type
74cdf0e10cSrcweir 
75cdf0e10cSrcweir     Uses getter/setter methods at the given iterator type, to access
76cdf0e10cSrcweir     the underlying values.
77cdf0e10cSrcweir  */
78cdf0e10cSrcweir template<typename ValueType> class NonStandardAccessor
79cdf0e10cSrcweir {
80cdf0e10cSrcweir public:
81cdf0e10cSrcweir     typedef ValueType value_type;
82cdf0e10cSrcweir 
83cdf0e10cSrcweir     // -------------------------------------------------------
84cdf0e10cSrcweir 
85cdf0e10cSrcweir     template< class Iterator >
operator ()(Iterator const & i) const86cdf0e10cSrcweir     value_type operator()(Iterator const& i) const
87cdf0e10cSrcweir     {
88cdf0e10cSrcweir         return i.get();
89cdf0e10cSrcweir     }
90cdf0e10cSrcweir 
91cdf0e10cSrcweir     template< class Iterator, class Difference >
operator ()(Iterator const & i,Difference const & diff) const92cdf0e10cSrcweir     value_type operator()(Iterator const& i, Difference const& diff) const
93cdf0e10cSrcweir     {
94cdf0e10cSrcweir         return i.get(diff);
95cdf0e10cSrcweir     }
96cdf0e10cSrcweir 
97cdf0e10cSrcweir     // -------------------------------------------------------
98cdf0e10cSrcweir 
99cdf0e10cSrcweir     template< typename V, class Iterator >
set(V const & value,Iterator const & i) const100cdf0e10cSrcweir     void set(V const& value, Iterator const& i) const
101cdf0e10cSrcweir     {
102cdf0e10cSrcweir         i.set( vigra::detail::RequiresExplicitCast<value_type>::cast(value) );
103cdf0e10cSrcweir     }
104cdf0e10cSrcweir 
105cdf0e10cSrcweir     template< typename V, class Iterator, class Difference >
set(V const & value,Iterator const & i,Difference const & diff) const106cdf0e10cSrcweir     void set(V const& value, Iterator const& i, Difference const& diff) const
107cdf0e10cSrcweir     {
108cdf0e10cSrcweir         i.set( vigra::detail::RequiresExplicitCast<value_type>::cast(value),
109cdf0e10cSrcweir                diff );
110cdf0e10cSrcweir     }
111cdf0e10cSrcweir };
112cdf0e10cSrcweir 
113cdf0e10cSrcweir } // namespace basebmp
114cdf0e10cSrcweir 
115cdf0e10cSrcweir #endif /* INCLUDED_BASEBMP_ACCESSOR_HXX */
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