60 lines
1.8 KiB
C++
60 lines
1.8 KiB
C++
//=======================================================================
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// Copyright 2001 Jeremy G. Siek, Andrew Lumsdaine, Lie-Quan Lee,
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//=======================================================================
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#include <vector>
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#include <string>
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#include <boost/property_map/property_map.hpp>
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#include <boost/concept/assert.hpp>
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#ifdef BOOST_NO_STD_ITERATOR_TRAITS
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#error This examples requires a compiler that provides a working std::iterator_traits
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#endif
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namespace foo
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{
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using namespace boost;
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template < class RandomAccessIterator, class IndexMap >
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class iterator_property_map:public boost::put_get_helper <
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typename std::iterator_traits < RandomAccessIterator >::reference,
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iterator_property_map < RandomAccessIterator, IndexMap > >
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{
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public:
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typedef std::ptrdiff_t key_type;
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typedef typename std::iterator_traits < RandomAccessIterator >::value_type
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value_type;
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typedef typename std::iterator_traits < RandomAccessIterator >::reference
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reference;
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typedef boost::lvalue_property_map_tag category;
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iterator_property_map(RandomAccessIterator cc = RandomAccessIterator(),
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const IndexMap & _id =
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IndexMap()):iter(cc), index(_id)
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{
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}
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reference operator[] (std::ptrdiff_t v) const
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{
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return *(iter + get(index, v));
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}
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protected:
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RandomAccessIterator iter;
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IndexMap index;
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};
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}
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int
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main()
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{
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typedef std::vector < std::string > vec_t;
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typedef foo::iterator_property_map < vec_t::iterator,
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boost::identity_property_map > pmap_t;
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using namespace boost;
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BOOST_CONCEPT_ASSERT(( Mutable_LvaluePropertyMapConcept<pmap_t, int> ));
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return 0;
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}
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