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// Copyright (c) 2008-2009 GeometryFactory and INRIA
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org).
// You can redistribute it and/or modify it under the terms of the GNU
// General Public License as published by the Free Software Foundation,
// either version 3 of the License, or (at your option) any later version.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $URL: svn+ssh://scm.gforge.inria.fr/svn/cgal/branches/next/Point_set_processing_3/include/CGAL/property_map.h $
// $Id: property_map.h 67117 2012-01-13 18:14:48Z lrineau $
//
// Author(s) : Andreas Fabri and Laurent Saboret
#ifndef CGAL_POINT_SET_PROPERTY_MAP_H
#define CGAL_POINT_SET_PROPERTY_MAP_H
#include <CGAL/value_type_traits.h>
#include <boost/version.hpp>
#if BOOST_VERSION >= 104000
#include <boost/property_map/property_map.hpp>
#else
#include <boost/property_map.hpp>
#endif
#include <boost/tuple/tuple.hpp>
#include <utility> // defines std::pair
namespace CGAL {
/// Property map that converts a 'T*' pointer (or in general
/// an iterator over 'T' elements) to the 'T' object.
///
/// @heading Is Model for the Concepts:
/// Model of boost::LvaluePropertyMap concept.
template <typename T>
struct Dereference_property_map
: public boost::put_get_helper<T&, Dereference_property_map<T> >
{
typedef T* key_type; ///< typedef to 'T*'
typedef T value_type; ///< typedef to 'T'
typedef value_type& reference; ///< typedef to 'T&'
typedef boost::lvalue_property_map_tag category; ///< boost::lvalue_property_map_tag
/// Access a property map element.
///
/// @commentheading Template Parameters:
/// @param Iter Type convertible to key_type.
template <class Iter>
reference operator[](Iter it) const { return reference(*it); }
};
/// Free function to create a Dereference_property_map property map.
///
/// @relates Dereference_property_map
template <class Iter> // Type convertible to key_type
Dereference_property_map<typename CGAL::value_type_traits<Iter>::type>
make_dereference_property_map(Iter)
{
// value_type_traits is a workaround as back_insert_iterator's value_type is void
return Dereference_property_map<typename CGAL::value_type_traits<Iter>::type>();
}
//=========================================================================
// Property maps Pair* -> Pair::first_type
// and Pair* -> Pair::second_type.
/// Property map that accesses the first item of a std::pair.
///
/// @heading Is Model for the Concepts:
/// Model of boost::LvaluePropertyMap concept.
///
/// @heading Parameters:
/// @param Pair Instance of std::pair.
template <typename Pair>
struct First_of_pair_property_map
: public boost::put_get_helper<typename Pair::first_type&,
First_of_pair_property_map<Pair> >
{
typedef Pair* key_type; ///< typedef to 'Pair*'
typedef typename Pair::first_type value_type; ///< typedef to Pair::first_type
typedef value_type& reference; ///< typedef to value_type&
typedef boost::lvalue_property_map_tag category; ///< boost::lvalue_property_map_tag
/// Access a property map element.
///
/// @commentheading Template Parameters:
/// @param Iter Type convertible to key_type.
template <class Iter>
reference operator[](Iter pair) const { return reference(pair->first); }
};
/// Free function to create a First_of_pair_property_map property map.
///
/// @relates First_of_pair_property_map
template <class Iter> // Type convertible to key_type
First_of_pair_property_map<typename CGAL::value_type_traits<Iter>::type>
make_first_of_pair_property_map(Iter)
{
// value_type_traits is a workaround as back_insert_iterator's value_type is void
return First_of_pair_property_map<typename CGAL::value_type_traits<Iter>::type>();
}
/// Property map that accesses the second item of a std::pair.
///
/// @heading Is Model for the Concepts:
/// Model of boost::LvaluePropertyMap concept.
///
/// @heading Parameters:
/// @param Pair Instance of std::pair.
template <typename Pair>
struct Second_of_pair_property_map
: public boost::put_get_helper<typename Pair::second_type&,
Second_of_pair_property_map<Pair> >
{
typedef Pair* key_type; ///< typedef to 'Pair*'
typedef typename Pair::second_type value_type; ///< typedef to Pair::second_type
typedef value_type& reference; ///< typedef to value_type&
typedef boost::lvalue_property_map_tag category; ///< boost::lvalue_property_map_tag
/// Access a property map element.
///
/// @commentheading Template Parameters:
/// @param Iter Type convertible to key_type.
template <class Iter>
reference operator[](Iter pair) const { return reference(pair->second); }
};
/// Free function to create a Second_of_pair_property_map property map.
///
/// @relates Second_of_pair_property_map
template <class Iter> // Type convertible to key_type
Second_of_pair_property_map<typename CGAL::value_type_traits<Iter>::type>
make_second_of_pair_property_map(Iter)
{
// value_type_traits is a workaround as back_insert_iterator's value_type is void
return Second_of_pair_property_map<typename CGAL::value_type_traits<Iter>::type>();
}
//=========================================================================
/// Property map that accesses the Nth item of a boost::tuple.
///
/// @heading Is Model for the Concepts:
/// Model of boost::LvaluePropertyMap concept.
///
/// @heading Parameters:
/// @param N Index of the item to access.
/// @param Tuple Instance of boost::tuple.
template <int N, typename Tuple>
struct Nth_of_tuple_property_map
: public boost::put_get_helper<typename boost::tuples::element<N,Tuple>::type&,
Nth_of_tuple_property_map<N,Tuple> >
{
typedef Tuple* key_type; ///< typedef to 'Tuple*'
typedef typename boost::tuples::element<N,Tuple>::type value_type; ///< typedef to boost::tuples::element<N,Tuple>::type
typedef value_type& reference; ///< typedef to value_type&
typedef boost::lvalue_property_map_tag category; ///< boost::lvalue_property_map_tag
/// Access a property map element.
///
/// @commentheading Template Parameters:
/// @param Iter Type convertible to key_type.
template <class Iter>
reference operator[](Iter tuple) const { return (reference) tuple->template get<N>(); }
};
/// Free function to create a Nth_of_tuple_property_map property map.
///
/// @relates Nth_of_tuple_property_map
template <int N, class Iter> // Type convertible to key_type
Nth_of_tuple_property_map<N, typename CGAL::value_type_traits<Iter>::type>
make_nth_of_tuple_property_map(Iter)
{
// value_type_traits is a workaround as back_insert_iterator's value_type is void
return Nth_of_tuple_property_map<N, typename CGAL::value_type_traits<Iter>::type>();
}
} // namespace CGAL
#endif // CGAL_POINT_SET_PROPERTY_MAP_H
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