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author | Boris Kolpackov <boris@codesynthesis.com> | 2009-09-06 12:52:53 +0200 |
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committer | Boris Kolpackov <boris@codesynthesis.com> | 2009-09-06 12:52:53 +0200 |
commit | cb9ea47e7825b5073d4d645afb94f6326cb7cf4d (patch) | |
tree | 201c215b08df918924153a60520046c294438a6b /cutl/container/pointer-iterator.hxx |
Start the libcutl repository
Diffstat (limited to 'cutl/container/pointer-iterator.hxx')
-rw-r--r-- | cutl/container/pointer-iterator.hxx | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/cutl/container/pointer-iterator.hxx b/cutl/container/pointer-iterator.hxx new file mode 100644 index 0000000..cc94151 --- /dev/null +++ b/cutl/container/pointer-iterator.hxx @@ -0,0 +1,127 @@ +// file : cutl/container/pointer-iterator.hxx +// author : Boris Kolpackov <boris@codesynthesis.com> +// copyright : Copyright (c) 2009 Code Synthesis Tools CC +// license : MIT; see accompanying LICENSE file + +#ifndef CUTL_CONTAINER_POINTER_ITERATOR_HXX +#define CUTL_CONTAINER_POINTER_ITERATOR_HXX + +#include <iterator> // std::iterator_traits + +#include <cutl/meta/remove-p.hxx> + +namespace cutl +{ + namespace container + { + template <typename I> + class pointer_iterator + { + public: + typedef + typename meta::remove_p<typename std::iterator_traits<I>::value_type>::r + value_type; + + typedef + typename std::iterator_traits<I>::iterator_category + iterator_category; + + typedef + typename std::iterator_traits<I>::difference_type + difference_type; + + typedef value_type& reference; + typedef value_type* pointer; + typedef I base_iterator; + + public: + pointer_iterator () + : i_ () // I can be of a pointer type. + { + } + + pointer_iterator (I const& i) + : i_ (i) + { + } + + public: + reference + operator* () const + { + return **i_; + } + + pointer + operator-> () const + { + return *i_; + } + + I const& + base () const + { + return i_; + } + + public: + // Forward iterator requirements. + // + pointer_iterator& + operator++ () + { + ++i_; + return *this; + } + + pointer_iterator + operator++ (int) + { + pointer_iterator r (*this); + ++i_; + return r; + } + + pointer_iterator& + operator-- () + { + --i_; + return *this; + } + + pointer_iterator + operator-- (int) + { + pointer_iterator r (*this); + --i_; + return r; + } + + private: + I i_; + }; + + template <typename I> + inline bool + operator== (pointer_iterator<I> const& a, pointer_iterator<I> const& b) + { + return a.base () == b.base (); + } + + template <typename I> + inline bool + operator!= (pointer_iterator<I> const& a, pointer_iterator<I> const& b) + { + return a.base () != b.base (); + } + + template <typename I> + inline typename pointer_iterator<I>::difference_type + operator- (pointer_iterator<I> const& a, pointer_iterator<I> const& b) + { + return a.base () - b.base (); + } + } +} + +#endif // CUTL_CONTAINER_POINTER_ITERATOR_HXX |