forked from boostorg/mpl
84 lines
2.2 KiB
C++
84 lines
2.2 KiB
C++
//-----------------------------------------------------------------------------
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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
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