80 lines
1.8 KiB
C++
80 lines
1.8 KiB
C++
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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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// Copyright Aleksey Gurtovoy 2000-2002
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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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// $Id$
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// $Date$
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// $Revision$
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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/eval_if.hpp>
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#include <boost/mpl/apply.hpp>
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#include <boost/mpl/aux_/msvc_eti_base.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/mpl/aux_/config/forwarding.hpp>
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namespace boost { 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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#if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING)
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: eval_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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>
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{
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#else
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{
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typedef typename eval_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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#endif
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};
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};
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} // namespace aux
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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 count_if
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: aux::msvc_eti_base< typename fold<
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Sequence
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, integral_c<unsigned long,0>
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, protect< aux::next_if<Predicate> >
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>::type >
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{
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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_NA_SPEC(2, count_if)
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}}
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#endif // BOOST_MPL_COUNT_IF_HPP_INCLUDED
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