forked from boostorg/fusion
104 lines
3.0 KiB
C++
104 lines
3.0 KiB
C++
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/*=============================================================================
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Copyright (c) 2001-2007 Joel de Guzman
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Copyright (c) 2005-2006 Dan Marsden
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#if !defined(FUSION_STRUCT_ITERATOR_APRIL_2_2007_1008AM)
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#define FUSION_STRUCT_ITERATOR_APRIL_2_2007_1008AM
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#include <boost/fusion/iterator/iterator_facade.hpp>
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#include <boost/fusion/adapted/struct/extension.hpp>
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#include <boost/type_traits/is_const.hpp>
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#include <boost/type_traits/add_reference.hpp>
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#include <boost/mpl/assert.hpp>
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#include <boost/mpl/identity.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/mpl/int.hpp>
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#include <boost/mpl/minus.hpp>
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#include <utility>
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namespace boost { namespace fusion
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{
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struct random_access_traversal_tag;
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template <typename Struct, int N_>
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struct struct_iterator
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: iterator_facade<struct_iterator<Struct, N_>, random_access_traversal_tag>
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{
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BOOST_MPL_ASSERT_RELATION(N_, >=, 0);
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BOOST_MPL_ASSERT_RELATION(N_, <=, extension::struct_size<Struct>::value);
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typedef mpl::int_<N_> index;
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typedef Struct struct_type;
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struct_iterator(Struct& struct_)
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: struct_(struct_) {}
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Struct& struct_;
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template <typename Iterator>
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struct value_of
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: extension::struct_member<Struct, N_>
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{
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};
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template <typename Iterator>
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struct deref
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{
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typedef typename
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add_reference<
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typename extension::struct_member<Struct, N_>::type
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>::type
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type;
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static type
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call(Iterator const& iter)
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{
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return extension::struct_member<Struct, N_>::
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call(iter.struct_);
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}
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};
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template <typename Iterator, typename N>
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struct advance
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{
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typedef typename Iterator::index index;
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typedef typename Iterator::struct_type struct_type;
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typedef struct_iterator<struct_type, index::value + N::value> type;
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static type
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call(Iterator const& iter)
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{
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return type(iter.struct_);
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}
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};
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template <typename Iterator>
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struct next : advance<Iterator, mpl::int_<1> > {};
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template <typename Iterator>
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struct prior : advance<Iterator, mpl::int_<-1> > {};
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template <typename I1, typename I2>
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struct distance : mpl::minus<typename I2::index, typename I1::index>
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{
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typedef typename
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mpl::minus<
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typename I2::index, typename I1::index
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>::type
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type;
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static type
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call(I1 const&, I2 const&)
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{
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return type();
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}
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};
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};
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}}
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#endif
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