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Viewing changes to boost/boost/mpl/count_if.hpp

  • Committer: Bazaar Package Importer
  • Author(s): LaMont Jones
  • Date: 2004-08-24 07:25:04 UTC
  • Revision ID: james.westby@ubuntu.com-20040824072504-zf993vnevvisdsvb
Tags: upstream-0.9.1
Import upstream version 0.9.1

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boost/boost/mpl/count_if.hpp
 
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//-----------------------------------------------------------------------------
 
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// boost mpl/count_if.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_COUNT_IF_HPP_INCLUDED
 
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#define BOOST_MPL_COUNT_IF_HPP_INCLUDED
 
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#include "boost/mpl/fold.hpp"
 
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#include "boost/mpl/next.hpp"
 
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#include "boost/mpl/integral_c.hpp"
 
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#include "boost/mpl/identity.hpp"
 
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#include "boost/mpl/apply_if.hpp"
 
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#include "boost/mpl/lambda.hpp"
 
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#include "boost/mpl/protect.hpp"
 
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#include "boost/mpl/apply.hpp"
 
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#include "boost/mpl/aux_/void_spec.hpp"
 
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#include "boost/mpl/aux_/lambda_support.hpp"
 
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namespace boost {
 
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namespace mpl {
 
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namespace aux {
 
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template< typename Predicate >
 
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struct next_if
 
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{
 
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    template<
 
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          typename N
 
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        , typename T
 
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        >
 
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    struct apply
 
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    {
 
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        typedef typename apply_if<
 
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              typename apply1<Predicate,T>::type
 
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            , next<N>
 
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            , identity<N>
 
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            >::type type;
 
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    };
 
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};
 
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} // namespace aux
 
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BOOST_MPL_AUX_AGLORITHM_NAMESPACE_BEGIN
 
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template<
 
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      typename BOOST_MPL_AUX_VOID_SPEC_PARAM(Sequence)
 
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    , typename BOOST_MPL_AUX_VOID_SPEC_PARAM(Predicate)
 
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    >
 
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struct count_if
 
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{
 
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 private:
 
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    typedef typename lambda<Predicate>::type pred_;
 
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 public:
 
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    typedef typename fold<
 
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          Sequence
 
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        , integral_c<unsigned long, 0>
 
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        , protect< aux::next_if<pred_> >
 
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        >::type type;
 
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    BOOST_MPL_AUX_LAMBDA_SUPPORT(2,count_if,(Sequence,Predicate))
 
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};
 
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BOOST_MPL_AUX_AGLORITHM_NAMESPACE_END
 
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BOOST_MPL_AUX_ALGORITHM_VOID_SPEC(2, count_if)
 
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} // namespace mpl
 
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} // namespace boost
 
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#endif // BOOST_MPL_COUNT_IF_HPP_INCLUDED