sl@0: //  (C) Copyright Jeremy Siek 1999-2001.
sl@0: // Distributed under the Boost Software License, Version 1.0. (See
sl@0: // accompanying file LICENSE_1_0.txt or copy at
sl@0: // http://www.boost.org/LICENSE_1_0.txt)
sl@0: 
sl@0: //  See http://www.boost.org/libs/property_map for documentation.
sl@0: 
sl@0: #ifndef BOOST_PROPERTY_MAP_HPP
sl@0: #define BOOST_PROPERTY_MAP_HPP
sl@0: 
sl@0: #include <cassert>
sl@0: #include <boost/config.hpp>
sl@0: #include <boost/pending/cstddef.hpp>
sl@0: #include <boost/detail/iterator.hpp>
sl@0: #include <boost/concept_check.hpp>
sl@0: #include <boost/concept_archetype.hpp>
sl@0: 
sl@0: namespace boost {
sl@0: 
sl@0:   //=========================================================================
sl@0:   // property_traits class
sl@0: 
sl@0:   template <typename PA>
sl@0:   struct property_traits {
sl@0:     typedef typename PA::key_type key_type;
sl@0:     typedef typename PA::value_type value_type; 
sl@0:     typedef typename PA::reference reference;
sl@0:     typedef typename PA::category   category;
sl@0:   };
sl@0: 
sl@0:   //=========================================================================
sl@0:   // property_traits category tags
sl@0: 
sl@0:   namespace detail {
sl@0:     enum ePropertyMapID { READABLE_PA, WRITABLE_PA, 
sl@0:                           READ_WRITE_PA, LVALUE_PA, OP_BRACKET_PA, 
sl@0:                           RAND_ACCESS_ITER_PA, LAST_PA };
sl@0:   }
sl@0:   struct readable_property_map_tag { enum { id = detail::READABLE_PA }; };
sl@0:   struct writable_property_map_tag { enum { id = detail::WRITABLE_PA }; };
sl@0:   struct read_write_property_map_tag :
sl@0:     public readable_property_map_tag,
sl@0:     public writable_property_map_tag
sl@0:   { enum { id = detail::READ_WRITE_PA }; };
sl@0: 
sl@0:   struct lvalue_property_map_tag : public read_write_property_map_tag
sl@0:   { enum { id = detail::LVALUE_PA }; };
sl@0: 
sl@0:   //=========================================================================
sl@0:   // property_traits specialization for pointers
sl@0: 
sl@0: #ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
sl@0:   // The user will just have to create their own specializations for
sl@0:   // other pointers types if the compiler does not have partial
sl@0:   // specializations. Sorry!
sl@0: #define BOOST_SPECIALIZE_PROPERTY_TRAITS_PTR(TYPE) \
sl@0:   template <> \
sl@0:   struct property_traits<TYPE*> { \
sl@0:     typedef TYPE value_type; \
sl@0:     typedef value_type& reference; \
sl@0:     typedef std::ptrdiff_t key_type; \
sl@0:     typedef lvalue_property_map_tag   category; \
sl@0:   }; \
sl@0:   template <> \
sl@0:   struct property_traits<const TYPE*> { \
sl@0:     typedef TYPE value_type; \
sl@0:     typedef const value_type& reference; \
sl@0:     typedef std::ptrdiff_t key_type; \
sl@0:     typedef lvalue_property_map_tag   category; \
sl@0:   }
sl@0: 
sl@0:   BOOST_SPECIALIZE_PROPERTY_TRAITS_PTR(long);
sl@0:   BOOST_SPECIALIZE_PROPERTY_TRAITS_PTR(unsigned long);
sl@0:   BOOST_SPECIALIZE_PROPERTY_TRAITS_PTR(int);
sl@0:   BOOST_SPECIALIZE_PROPERTY_TRAITS_PTR(unsigned int);
sl@0:   BOOST_SPECIALIZE_PROPERTY_TRAITS_PTR(short);
sl@0:   BOOST_SPECIALIZE_PROPERTY_TRAITS_PTR(unsigned short);
sl@0:   BOOST_SPECIALIZE_PROPERTY_TRAITS_PTR(char);
sl@0:   BOOST_SPECIALIZE_PROPERTY_TRAITS_PTR(unsigned char);
sl@0:   BOOST_SPECIALIZE_PROPERTY_TRAITS_PTR(signed char);
sl@0:   BOOST_SPECIALIZE_PROPERTY_TRAITS_PTR(bool);
sl@0:   BOOST_SPECIALIZE_PROPERTY_TRAITS_PTR(float);
sl@0:   BOOST_SPECIALIZE_PROPERTY_TRAITS_PTR(double);
sl@0:   BOOST_SPECIALIZE_PROPERTY_TRAITS_PTR(long double);
sl@0: 
sl@0:   // This may need to be turned off for some older compilers that don't have
sl@0:   // wchar_t intrinsically.
sl@0: # ifndef BOOST_NO_INTRINSIC_WCHAR_T
sl@0:   template <>
sl@0:   struct property_traits<wchar_t*> {
sl@0:     typedef wchar_t value_type;
sl@0:     typedef value_type& reference;
sl@0:     typedef std::ptrdiff_t key_type;
sl@0:     typedef lvalue_property_map_tag   category;
sl@0:   };
sl@0:   template <>
sl@0:   struct property_traits<const wchar_t*> {
sl@0:     typedef wchar_t value_type;
sl@0:     typedef const value_type& reference;
sl@0:     typedef std::ptrdiff_t key_type;
sl@0:     typedef lvalue_property_map_tag   category;
sl@0:   };
sl@0: # endif
sl@0: 
sl@0: #else
sl@0:   template <class T>
sl@0:   struct property_traits<T*> {
sl@0:     typedef T value_type;
sl@0:     typedef value_type& reference;
sl@0:     typedef std::ptrdiff_t key_type;
sl@0:     typedef lvalue_property_map_tag category;
sl@0:   };
sl@0:   template <class T>
sl@0:   struct property_traits<const T*> {
sl@0:     typedef T value_type;
sl@0:     typedef const value_type& reference;
sl@0:     typedef std::ptrdiff_t key_type;
sl@0:     typedef lvalue_property_map_tag category;
sl@0:   };
sl@0: #endif
sl@0: 
sl@0: #if !defined(BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP)
sl@0:   // MSVC doesn't have Koenig lookup, so the user has to
sl@0:   // do boost::get() anyways, and the using clause
sl@0:   // doesn't really work for MSVC.
sl@0: } // namespace boost
sl@0: #endif
sl@0: 
sl@0:   // These need to go in global namespace because Koenig
sl@0:   // lookup does not apply to T*.
sl@0: 
sl@0:   // V must be convertible to T
sl@0:   template <class T, class V>
sl@0:   inline void put(T* pa, std::ptrdiff_t k, const V& val) { pa[k] = val;  }
sl@0: 
sl@0:   template <class T>
sl@0:   inline const T& get(const T* pa, std::ptrdiff_t k) { return pa[k]; }
sl@0: 
sl@0: #if !defined(BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP)
sl@0: namespace boost {
sl@0:   using ::put;
sl@0:   using ::get;
sl@0: #endif
sl@0: 
sl@0:   //=========================================================================
sl@0:   // concept checks for property maps
sl@0: 
sl@0:   template <class PMap, class Key>
sl@0:   struct ReadablePropertyMapConcept
sl@0:   {
sl@0:     typedef typename property_traits<PMap>::key_type key_type;
sl@0:     typedef typename property_traits<PMap>::reference reference;
sl@0:     typedef typename property_traits<PMap>::category Category;
sl@0:     typedef boost::readable_property_map_tag ReadableTag;
sl@0:     void constraints() {
sl@0:       function_requires< ConvertibleConcept<Category, ReadableTag> >();
sl@0: 
sl@0:       val = get(pmap, k);
sl@0:     }
sl@0:     PMap pmap;
sl@0:     Key k;
sl@0:     typename property_traits<PMap>::value_type val;
sl@0:   };
sl@0:   template <typename KeyArchetype, typename ValueArchetype>
sl@0:   struct readable_property_map_archetype {
sl@0:     typedef KeyArchetype key_type;
sl@0:     typedef ValueArchetype value_type;
sl@0:     typedef convertible_to_archetype<ValueArchetype> reference;
sl@0:     typedef readable_property_map_tag category;
sl@0:   };
sl@0:   template <typename K, typename V>
sl@0:   const typename readable_property_map_archetype<K,V>::reference&
sl@0:   get(const readable_property_map_archetype<K,V>&, 
sl@0:       const typename readable_property_map_archetype<K,V>::key_type&)
sl@0:   {
sl@0:     typedef typename readable_property_map_archetype<K,V>::reference R;
sl@0:     return static_object<R>::get();
sl@0:   }
sl@0: 
sl@0: 
sl@0:   template <class PMap, class Key>
sl@0:   struct WritablePropertyMapConcept
sl@0:   {
sl@0:     typedef typename property_traits<PMap>::key_type key_type;
sl@0:     typedef typename property_traits<PMap>::category Category;
sl@0:     typedef boost::writable_property_map_tag WritableTag;
sl@0:     void constraints() {
sl@0:       function_requires< ConvertibleConcept<Category, WritableTag> >();
sl@0:       put(pmap, k, val);
sl@0:     }
sl@0:     PMap pmap;
sl@0:     Key k;
sl@0:     typename property_traits<PMap>::value_type val;
sl@0:   };
sl@0:   template <typename KeyArchetype, typename ValueArchetype>
sl@0:   struct writable_property_map_archetype {
sl@0:     typedef KeyArchetype key_type;
sl@0:     typedef ValueArchetype value_type;
sl@0:     typedef void reference;
sl@0:     typedef writable_property_map_tag category;
sl@0:   };
sl@0:   template <typename K, typename V>
sl@0:   void put(const writable_property_map_archetype<K,V>&, 
sl@0:            const typename writable_property_map_archetype<K,V>::key_type&, 
sl@0:            const typename writable_property_map_archetype<K,V>::value_type&) { }
sl@0: 
sl@0: 
sl@0:   template <class PMap, class Key>
sl@0:   struct ReadWritePropertyMapConcept
sl@0:   {
sl@0:     typedef typename property_traits<PMap>::category Category;
sl@0:     typedef boost::read_write_property_map_tag ReadWriteTag;
sl@0:     void constraints() {
sl@0:       function_requires< ReadablePropertyMapConcept<PMap, Key> >();
sl@0:       function_requires< WritablePropertyMapConcept<PMap, Key> >();
sl@0:       function_requires< ConvertibleConcept<Category, ReadWriteTag> >();
sl@0:     }
sl@0:   };
sl@0:   template <typename KeyArchetype, typename ValueArchetype>
sl@0:   struct read_write_property_map_archetype
sl@0:     : public readable_property_map_archetype<KeyArchetype, ValueArchetype>,
sl@0:       public writable_property_map_archetype<KeyArchetype, ValueArchetype>
sl@0:   {
sl@0:     typedef KeyArchetype key_type;
sl@0:     typedef ValueArchetype value_type;
sl@0:     typedef convertible_to_archetype<ValueArchetype> reference;
sl@0:     typedef read_write_property_map_tag category;
sl@0:   };
sl@0: 
sl@0: 
sl@0:   template <class PMap, class Key>
sl@0:   struct LvaluePropertyMapConcept
sl@0:   {
sl@0:     typedef typename property_traits<PMap>::category Category;
sl@0:     typedef boost::lvalue_property_map_tag LvalueTag;
sl@0:     typedef typename property_traits<PMap>::reference reference;
sl@0: 
sl@0:     void constraints() {
sl@0:       function_requires< ReadablePropertyMapConcept<PMap, Key> >();
sl@0:       function_requires< ConvertibleConcept<Category, LvalueTag> >();
sl@0: 
sl@0:       typedef typename property_traits<PMap>::value_type value_type;
sl@0:       typedef typename require_same<
sl@0:         const value_type&, reference>::type req;
sl@0: 
sl@0:       reference ref = pmap[k];
sl@0:       ignore_unused_variable_warning(ref);
sl@0:     }
sl@0:     PMap pmap;
sl@0:     Key k;
sl@0:   };
sl@0:   template <typename KeyArchetype, typename ValueArchetype>
sl@0:   struct lvalue_property_map_archetype
sl@0:     : public readable_property_map_archetype<KeyArchetype, ValueArchetype>
sl@0:   {
sl@0:     typedef KeyArchetype key_type;
sl@0:     typedef ValueArchetype value_type;
sl@0:     typedef const ValueArchetype& reference;
sl@0:     typedef lvalue_property_map_tag category;
sl@0:     const value_type& operator[](const key_type&) const {
sl@0:       return static_object<value_type>::get();
sl@0:     }
sl@0:   };
sl@0: 
sl@0:   template <class PMap, class Key>
sl@0:   struct Mutable_LvaluePropertyMapConcept
sl@0:   {
sl@0:     typedef typename property_traits<PMap>::category Category;
sl@0:     typedef boost::lvalue_property_map_tag LvalueTag;
sl@0:     typedef typename property_traits<PMap>::reference reference;
sl@0:     void constraints() { 
sl@0:       boost::function_requires< ReadWritePropertyMapConcept<PMap, Key> >();
sl@0:       boost::function_requires<ConvertibleConcept<Category, LvalueTag> >();
sl@0:       
sl@0:       typedef typename property_traits<PMap>::value_type value_type;
sl@0:       typedef typename require_same<
sl@0:         value_type&,
sl@0:         reference>::type req;
sl@0: 
sl@0:       reference ref = pmap[k];
sl@0:       ignore_unused_variable_warning(ref);
sl@0:     }
sl@0:     PMap pmap;
sl@0:     Key k;
sl@0:   };
sl@0:   template <typename KeyArchetype, typename ValueArchetype>
sl@0:   struct mutable_lvalue_property_map_archetype
sl@0:     : public readable_property_map_archetype<KeyArchetype, ValueArchetype>,
sl@0:       public writable_property_map_archetype<KeyArchetype, ValueArchetype>
sl@0:   {
sl@0:     typedef KeyArchetype key_type;
sl@0:     typedef ValueArchetype value_type;
sl@0:     typedef ValueArchetype& reference;
sl@0:     typedef lvalue_property_map_tag category;
sl@0:     value_type& operator[](const key_type&) const { 
sl@0:       return static_object<value_type>::get();
sl@0:     }
sl@0:   };
sl@0: 
sl@0:   struct identity_property_map;
sl@0: 
sl@0:   // A helper class for constructing a property map
sl@0:   // from a class that implements operator[]
sl@0: 
sl@0:   template <class Reference, class LvaluePropertyMap>
sl@0:   struct put_get_helper { };
sl@0: 
sl@0:   template <class PropertyMap, class Reference, class K>
sl@0:   inline Reference
sl@0:   get(const put_get_helper<Reference, PropertyMap>& pa, const K& k)
sl@0:   {
sl@0:     Reference v = static_cast<const PropertyMap&>(pa)[k];
sl@0:     return v;
sl@0:   }
sl@0:   template <class PropertyMap, class Reference, class K, class V>
sl@0:   inline void
sl@0:   put(const put_get_helper<Reference, PropertyMap>& pa, K k, const V& v)
sl@0:   {
sl@0:     static_cast<const PropertyMap&>(pa)[k] = v;
sl@0:   }
sl@0: 
sl@0:   //=========================================================================
sl@0:   // Adapter to turn a RandomAccessIterator into a property map
sl@0: 
sl@0:   template <class RandomAccessIterator, 
sl@0:     class IndexMap
sl@0: #ifdef BOOST_NO_STD_ITERATOR_TRAITS
sl@0:     , class T, class R
sl@0: #else
sl@0:     , class T = typename std::iterator_traits<RandomAccessIterator>::value_type
sl@0:     , class R = typename std::iterator_traits<RandomAccessIterator>::reference
sl@0: #endif
sl@0:      >
sl@0:   class iterator_property_map
sl@0:     : public boost::put_get_helper< R, 
sl@0:         iterator_property_map<RandomAccessIterator, IndexMap,
sl@0:         T, R> >
sl@0:   {
sl@0:   public:
sl@0:     typedef typename property_traits<IndexMap>::key_type key_type;
sl@0:     typedef T value_type;
sl@0:     typedef R reference;
sl@0:     typedef boost::lvalue_property_map_tag category;
sl@0: 
sl@0:     inline iterator_property_map(
sl@0:       RandomAccessIterator cc = RandomAccessIterator(), 
sl@0:       const IndexMap& _id = IndexMap() ) 
sl@0:       : iter(cc), index(_id) { }
sl@0:     inline R operator[](key_type v) const { return *(iter + get(index, v)) ; }
sl@0:   protected:
sl@0:     RandomAccessIterator iter;
sl@0:     IndexMap index;
sl@0:   };
sl@0: 
sl@0: #if !defined BOOST_NO_STD_ITERATOR_TRAITS
sl@0:   template <class RAIter, class ID>
sl@0:   inline iterator_property_map<
sl@0:     RAIter, ID,
sl@0:     typename std::iterator_traits<RAIter>::value_type,
sl@0:     typename std::iterator_traits<RAIter>::reference>
sl@0:   make_iterator_property_map(RAIter iter, ID id) {
sl@0:     function_requires< RandomAccessIteratorConcept<RAIter> >();
sl@0:     typedef iterator_property_map<
sl@0:       RAIter, ID,
sl@0:       typename std::iterator_traits<RAIter>::value_type,
sl@0:       typename std::iterator_traits<RAIter>::reference> PA;
sl@0:     return PA(iter, id);
sl@0:   }
sl@0: #endif
sl@0:   template <class RAIter, class Value, class ID>
sl@0:   inline iterator_property_map<RAIter, ID, Value, Value&>
sl@0:   make_iterator_property_map(RAIter iter, ID id, Value) {
sl@0:     function_requires< RandomAccessIteratorConcept<RAIter> >();
sl@0:     typedef iterator_property_map<RAIter, ID, Value, Value&> PMap;
sl@0:     return PMap(iter, id);
sl@0:   }
sl@0: 
sl@0:   template <class RandomAccessIterator, 
sl@0:     class IndexMap
sl@0: #ifdef BOOST_NO_STD_ITERATOR_TRAITS
sl@0:     , class T, class R
sl@0: #else
sl@0:     , class T = typename std::iterator_traits<RandomAccessIterator>::value_type
sl@0:     , class R = typename std::iterator_traits<RandomAccessIterator>::reference
sl@0: #endif
sl@0:      >
sl@0:   class safe_iterator_property_map
sl@0:     : public boost::put_get_helper< R, 
sl@0:         safe_iterator_property_map<RandomAccessIterator, IndexMap,
sl@0:         T, R> >
sl@0:   {
sl@0:   public:
sl@0:     typedef typename property_traits<IndexMap>::key_type key_type; 
sl@0:     typedef T value_type;
sl@0:     typedef R reference;
sl@0:     typedef boost::lvalue_property_map_tag category;
sl@0: 
sl@0:     inline safe_iterator_property_map(
sl@0:       RandomAccessIterator first, 
sl@0:       std::size_t n_ = 0, 
sl@0:       const IndexMap& _id = IndexMap() ) 
sl@0:       : iter(first), n(n_), index(_id) { }
sl@0:     inline safe_iterator_property_map() { }
sl@0:     inline R operator[](key_type v) const {
sl@0:       assert(get(index, v) < n);
sl@0:       return *(iter + get(index, v)) ;
sl@0:     }
sl@0:     typename property_traits<IndexMap>::value_type size() const { return n; }
sl@0:   protected:
sl@0:     RandomAccessIterator iter;
sl@0:     typename property_traits<IndexMap>::value_type n;
sl@0:     IndexMap index;
sl@0:   };
sl@0: 
sl@0: #if !defined BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
sl@0:   template <class RAIter, class ID>
sl@0:   inline safe_iterator_property_map<
sl@0:     RAIter, ID,
sl@0:     typename boost::detail::iterator_traits<RAIter>::value_type,
sl@0:     typename boost::detail::iterator_traits<RAIter>::reference>
sl@0:   make_safe_iterator_property_map(RAIter iter, std::size_t n, ID id) {
sl@0:     function_requires< RandomAccessIteratorConcept<RAIter> >();
sl@0:     typedef safe_iterator_property_map<
sl@0:       RAIter, ID,
sl@0:       typename boost::detail::iterator_traits<RAIter>::value_type,
sl@0:       typename boost::detail::iterator_traits<RAIter>::reference> PA;
sl@0:     return PA(iter, n, id);
sl@0:   }
sl@0: #endif
sl@0:   template <class RAIter, class Value, class ID>
sl@0:   inline safe_iterator_property_map<RAIter, ID, Value, Value&>
sl@0:   make_safe_iterator_property_map(RAIter iter, std::size_t n, ID id, Value) {
sl@0:     function_requires< RandomAccessIteratorConcept<RAIter> >();
sl@0:     typedef safe_iterator_property_map<RAIter, ID, Value, Value&> PMap;
sl@0:     return PMap(iter, n, id);
sl@0:   }
sl@0: 
sl@0:   //=========================================================================
sl@0:   // An adaptor to turn a Unique Pair Associative Container like std::map or
sl@0:   // std::hash_map into an Lvalue Property Map.
sl@0: 
sl@0:   template <typename UniquePairAssociativeContainer>
sl@0:   class associative_property_map
sl@0:     : public boost::put_get_helper<
sl@0:        typename UniquePairAssociativeContainer::value_type::second_type&,
sl@0:        associative_property_map<UniquePairAssociativeContainer> >
sl@0:   {
sl@0:     typedef UniquePairAssociativeContainer C;
sl@0:   public:
sl@0:     typedef typename C::key_type key_type;
sl@0:     typedef typename C::value_type::second_type value_type;
sl@0:     typedef value_type& reference;
sl@0:     typedef lvalue_property_map_tag category;
sl@0:     associative_property_map() : m_c(0) { }
sl@0:     associative_property_map(C& c) : m_c(&c) { }
sl@0:     reference operator[](const key_type& k) const {
sl@0:       return (*m_c)[k];
sl@0:     }
sl@0:   private:
sl@0:     C* m_c;
sl@0:   };
sl@0: 
sl@0:   template <class UniquePairAssociativeContainer>
sl@0:   associative_property_map<UniquePairAssociativeContainer>
sl@0:   make_assoc_property_map(UniquePairAssociativeContainer& c)
sl@0:   {
sl@0:     return associative_property_map<UniquePairAssociativeContainer>(c);
sl@0:   }
sl@0: 
sl@0:   template <typename UniquePairAssociativeContainer>
sl@0:   class const_associative_property_map
sl@0:     : public boost::put_get_helper<
sl@0:        const typename UniquePairAssociativeContainer::value_type::second_type&,
sl@0:        const_associative_property_map<UniquePairAssociativeContainer> >
sl@0:   {
sl@0:     typedef UniquePairAssociativeContainer C;
sl@0:   public:
sl@0:     typedef typename C::key_type key_type;
sl@0:     typedef typename C::value_type::second_type value_type;
sl@0:     typedef const value_type& reference;
sl@0:     typedef lvalue_property_map_tag category;
sl@0:     const_associative_property_map() : m_c(0) { }
sl@0:     const_associative_property_map(const C& c) : m_c(&c) { }
sl@0:     reference operator[](const key_type& k) const {
sl@0:       return m_c->find(k)->second;
sl@0:     }
sl@0:   private:
sl@0:     C const* m_c;
sl@0:   };
sl@0:   
sl@0:   template <class UniquePairAssociativeContainer>
sl@0:   const_associative_property_map<UniquePairAssociativeContainer>
sl@0:   make_assoc_property_map(const UniquePairAssociativeContainer& c)
sl@0:   {
sl@0:     return const_associative_property_map<UniquePairAssociativeContainer>(c);
sl@0:   }
sl@0: 
sl@0:   //=========================================================================
sl@0:   // A property map that applies the identity function to integers
sl@0:   struct identity_property_map
sl@0:     : public boost::put_get_helper<std::size_t, 
sl@0:         identity_property_map>
sl@0:   {
sl@0:     typedef std::size_t key_type;
sl@0:     typedef std::size_t value_type;
sl@0:     typedef std::size_t reference;
sl@0:     typedef boost::readable_property_map_tag category;
sl@0: 
sl@0:     inline value_type operator[](const key_type& v) const { return v; }
sl@0:   };
sl@0: 
sl@0:   //=========================================================================
sl@0:   // A property map that does not do anything, for
sl@0:   // when you have to supply a property map, but don't need it.
sl@0:   namespace detail {
sl@0:     struct dummy_pmap_reference {
sl@0:       template <class T>
sl@0:       dummy_pmap_reference& operator=(const T&) { return *this; }
sl@0:       operator int() { return 0; }
sl@0:     };
sl@0:   }
sl@0:   class dummy_property_map 
sl@0:     : public boost::put_get_helper<detail::dummy_pmap_reference,
sl@0:         dummy_property_map  > 
sl@0:   {
sl@0:   public:
sl@0:     typedef void key_type; 
sl@0:     typedef int value_type;
sl@0:     typedef detail::dummy_pmap_reference reference;
sl@0:     typedef boost::read_write_property_map_tag category;
sl@0:     inline dummy_property_map() : c(0) { }
sl@0:     inline dummy_property_map(value_type cc) : c(cc) { }
sl@0:     inline dummy_property_map(const dummy_property_map& x)
sl@0:       : c(x.c) { }
sl@0:     template <class Vertex>
sl@0:     inline reference operator[](Vertex) const { return reference(); }
sl@0:    protected:
sl@0:     value_type c;
sl@0:   };
sl@0: 
sl@0: 
sl@0: } // namespace boost
sl@0: 
sl@0: 
sl@0: #endif /* BOOST_PROPERTY_MAP_HPP */
sl@0: