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/src/contrib/boost/mpl/aux_/joint_iter.hpp

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C++ Header | 120 lines | 88 code | 22 blank | 10 comment | 0 complexity | 767e9506c7658898cc8f35788dbbb88d MD5 | raw file
  1
  2#ifndef BOOST_MPL_AUX_JOINT_ITER_HPP_INCLUDED
  3#define BOOST_MPL_AUX_JOINT_ITER_HPP_INCLUDED
  4
  5// Copyright Aleksey Gurtovoy 2000-2004
  6//
  7// Distributed under the Boost Software License, Version 1.0. 
  8// (See accompanying file LICENSE_1_0.txt or copy at 
  9// http://www.boost.org/LICENSE_1_0.txt)
 10//
 11// See http://www.boost.org/libs/mpl for documentation.
 12
 13// $Id: joint_iter.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
 14// $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $
 15// $Revision: 49267 $
 16
 17#include <boost/mpl/next_prior.hpp>
 18#include <boost/mpl/deref.hpp>
 19#include <boost/mpl/iterator_tags.hpp>
 20#include <boost/mpl/aux_/lambda_spec.hpp>
 21#include <boost/mpl/aux_/config/ctps.hpp>
 22
 23#if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
 24#   include <boost/type_traits/is_same.hpp>
 25#endif
 26
 27namespace boost { namespace mpl {
 28
 29#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
 30
 31template<
 32      typename Iterator1
 33    , typename LastIterator1
 34    , typename Iterator2
 35    >
 36struct joint_iter
 37{
 38    typedef Iterator1 base;
 39    typedef forward_iterator_tag category;
 40};
 41
 42template<
 43      typename LastIterator1
 44    , typename Iterator2
 45    >
 46struct joint_iter<LastIterator1,LastIterator1,Iterator2>
 47{
 48    typedef Iterator2 base;
 49    typedef forward_iterator_tag category;
 50};
 51
 52
 53template< typename I1, typename L1, typename I2 >
 54struct deref< joint_iter<I1,L1,I2> >
 55{
 56    typedef typename joint_iter<I1,L1,I2>::base base_;
 57    typedef typename deref<base_>::type type;
 58};
 59
 60template< typename I1, typename L1, typename I2 >
 61struct next< joint_iter<I1,L1,I2> >
 62{
 63    typedef joint_iter< typename mpl::next<I1>::type,L1,I2 > type;
 64};
 65
 66template< typename L1, typename I2 >
 67struct next< joint_iter<L1,L1,I2> >
 68{
 69    typedef joint_iter< L1,L1,typename mpl::next<I2>::type > type;
 70};
 71
 72#else // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
 73
 74template<
 75      typename Iterator1
 76    , typename LastIterator1
 77    , typename Iterator2
 78    >
 79struct joint_iter;
 80
 81template< bool > struct joint_iter_impl
 82{
 83    template< typename I1, typename L1, typename I2 > struct result_
 84    {
 85        typedef I1 base;
 86        typedef forward_iterator_tag category;
 87        typedef joint_iter< typename mpl::next<I1>::type,L1,I2 > next;
 88        typedef typename deref<I1>::type type;
 89    };
 90};
 91
 92template<> struct joint_iter_impl<true>
 93{
 94    template< typename I1, typename L1, typename I2 > struct result_
 95    {
 96        typedef I2 base;
 97        typedef forward_iterator_tag category;
 98        typedef joint_iter< L1,L1,typename mpl::next<I2>::type > next;
 99        typedef typename deref<I2>::type type;
100    };
101};
102
103template<
104      typename Iterator1
105    , typename LastIterator1
106    , typename Iterator2
107    >
108struct joint_iter
109    : joint_iter_impl< is_same<Iterator1,LastIterator1>::value >
110        ::template result_<Iterator1,LastIterator1,Iterator2>
111{
112};
113
114#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
115
116BOOST_MPL_AUX_PASS_THROUGH_LAMBDA_SPEC(3, joint_iter)
117
118}}
119
120#endif // BOOST_MPL_AUX_JOINT_ITER_HPP_INCLUDED