ceph/src/boost/libs/graph/example/put-get-helper-eg.cpp

   1 //=======================================================================
   2 // Copyright 2001 Jeremy G. Siek, Andrew Lumsdaine, Lie-Quan Lee,
   3 //
   4 // Distributed under the Boost Software License, Version 1.0. (See
   5 // accompanying file LICENSE_1_0.txt or copy at
   6 // http://www.boost.org/LICENSE_1_0.txt)
   7 //=======================================================================
   8 #include <vector>
   9 #include <string>
  10 #include <boost/property_map/property_map.hpp>
  11 #include <boost/concept/assert.hpp>
  12
  13 #ifdef BOOST_NO_STD_ITERATOR_TRAITS
  14 #error This examples requires a compiler that provides a working std::iterator_traits
  15 #endif
  16
  17
  18 namespace foo
  19 {
  20   using namespace boost;
  21     template < class RandomAccessIterator, class IndexMap >
  22     class iterator_property_map:public boost::put_get_helper <
  23     typename std::iterator_traits < RandomAccessIterator >::reference,
  24     iterator_property_map < RandomAccessIterator, IndexMap > >
  25   {
  26   public:
  27     typedef std::ptrdiff_t key_type;
  28     typedef typename std::iterator_traits < RandomAccessIterator >::value_type
  29       value_type;
  30     typedef typename std::iterator_traits < RandomAccessIterator >::reference
  31       reference;
  32     typedef boost::lvalue_property_map_tag category;
  33
  34       iterator_property_map(RandomAccessIterator cc = RandomAccessIterator(),
  35                             const IndexMap & _id =
  36                             IndexMap()):iter(cc), index(_id)
  37     {
  38     }
  39     reference operator[] (std::ptrdiff_t v) const
  40     {
  41       return *(iter + get(index, v));
  42     }
  43   protected:
  44       RandomAccessIterator iter;
  45     IndexMap index;
  46   };
  47
  48 }
  49
  50 int
  51 main()
  52 {
  53   typedef std::vector < std::string > vec_t;
  54   typedef foo::iterator_property_map < vec_t::iterator,
  55     boost::identity_property_map > pmap_t;
  56   using namespace boost;
  57   BOOST_CONCEPT_ASSERT(( Mutable_LvaluePropertyMapConcept<pmap_t, int> ));
  58   return 0;
  59 }