forked from boostorg/mpl
141 lines
3.5 KiB
C++
141 lines
3.5 KiB
C++
//-----------------------------------------------------------------------------
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// boost mpl/aux_/joint_iter.hpp header file
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// See http://www.boost.org for updates, documentation, and revision history.
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//-----------------------------------------------------------------------------
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//
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// Copyright (c) 2000-02
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// Aleksey Gurtovoy
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//
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// Permission to use, copy, modify, distribute and sell this software
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// and its documentation for any purpose is hereby granted without fee,
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// provided that the above copyright notice appears in all copies and
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// that both the copyright notice and this permission notice appear in
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// supporting documentation. No representations are made about the
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// suitability of this software for any purpose. It is provided "as is"
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// without express or implied warranty.
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#ifndef BOOST_MPL_AUX_JOINT_ITER_HPP_INCLUDED
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#define BOOST_MPL_AUX_JOINT_ITER_HPP_INCLUDED
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#include "boost/mpl/aux_/lambda_spec.hpp"
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#include "boost/mpl/aux_/config/ctps.hpp"
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#include "boost/type_traits/is_same.hpp"
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namespace boost { namespace mpl {
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namespace aux {
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#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
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template<
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typename Iterator1
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, typename LastIterator1
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, typename Iterator2
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>
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struct joint_iter
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{
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typedef Iterator1 base;
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typedef typename base::category category;
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typedef joint_iter<
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typename base::next
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, LastIterator1
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, Iterator2
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> next;
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typedef typename base::type type;
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};
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template<
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typename LastIterator1
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, typename Iterator2
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>
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struct joint_iter<LastIterator1,LastIterator1,Iterator2>
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{
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typedef Iterator2 base;
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typedef typename base::category category;
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typedef joint_iter<
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LastIterator1
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, LastIterator1
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, typename base::next
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> next;
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typedef typename base::type type;
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};
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#else
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// forward decl. for 'joint_iter_impl'
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template<
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typename Iterator1
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, typename LastIterator1
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, typename Iterator2
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>
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struct joint_iter;
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template< bool > struct joint_iter_impl
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{
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template<
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typename Iterator1
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, typename LastIterator1
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, typename Iterator2
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>
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struct result_
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{
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typedef Iterator1 base;
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// agurt, 16/nov/02: have to use 'Iterator1' instead of 'base' below
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// to prevent 'base' and 'mpl::base' conflict on MSVC 6.0
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typedef typename Iterator1::category category;
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typedef joint_iter<
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typename Iterator1::next
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, LastIterator1
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, Iterator2
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> next;
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typedef typename Iterator1::type type;
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};
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};
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template<> struct joint_iter_impl<true>
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{
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template<
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typename Iterator1
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, typename LastIterator1
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, typename Iterator2
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>
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struct result_
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{
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typedef Iterator2 base;
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typedef typename Iterator2::category category;
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typedef joint_iter<
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LastIterator1
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, LastIterator1
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, typename Iterator2::next
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> next;
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typedef typename Iterator2::type type;
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};
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};
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template<
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typename Iterator1
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, typename LastIterator1
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, typename Iterator2
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>
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struct joint_iter
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: joint_iter_impl< is_same<Iterator1,LastIterator1>::value >
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::template result_<Iterator1,LastIterator1,Iterator2>
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{
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};
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#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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} // namespace aux
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BOOST_MPL_AUX_PASS_THROUGH_LAMBDA_SPEC(3, aux::joint_iter)
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}} // namespace boost::mpl
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#endif // BOOST_MPL_AUX_JOINT_ITER_HPP_INCLUDED
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