author | Ross Qin <ross.qin@nokia.com> |
Tue, 30 Nov 2010 13:59:58 +0800 | |
changeset 712 | df89378e9223 |
parent 0 | 044383f39525 |
permissions | -rw-r--r-- |
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#ifndef BOOST_MPL_INDEX_IF_HPP_INCLUDED |
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#define BOOST_MPL_INDEX_IF_HPP_INCLUDED |
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// Copyright Eric Friedman 2003 |
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// |
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// Distributed under the Boost Software License, Version 1.0. |
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// (See 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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// See http://www.boost.org/libs/mpl for documentation. |
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// $Id: index_if.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ |
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// $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ |
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// $Revision: 49267 $ |
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#include <boost/mpl/aux_/find_if_pred.hpp> |
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#include <boost/mpl/begin_end.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/iter_fold_if.hpp> |
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#include <boost/mpl/next.hpp> |
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#include <boost/mpl/void.hpp> |
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#include <boost/mpl/aux_/na_spec.hpp> |
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#include <boost/mpl/aux_/lambda_support.hpp> |
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#include <boost/type_traits/is_same.hpp> |
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namespace boost { namespace mpl { |
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template< |
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typename BOOST_MPL_AUX_NA_PARAM(Sequence) |
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, typename BOOST_MPL_AUX_NA_PARAM(Predicate) |
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> |
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struct index_if |
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{ |
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typedef typename iter_fold_if< |
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Sequence |
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, int_<0> |
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, next<> |
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, aux::find_if_pred<Predicate> |
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>::type result_; |
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typedef typename end<Sequence>::type not_found_; |
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typedef typename first<result_>::type result_index_; |
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typedef typename second<result_>::type result_iterator_; |
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typedef typename if_< |
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is_same< result_iterator_,not_found_ > |
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, void_ |
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, result_index_ |
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>::type type; |
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BOOST_MPL_AUX_LAMBDA_SUPPORT(2,index_if,(Sequence,Predicate)) |
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}; |
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BOOST_MPL_AUX_NA_SPEC(2, index_if) |
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}} |
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#endif // BOOST_MPL_INDEX_IF_HPP_INCLUDED |