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| 2 | #ifndef BOOST_MPL_COUNT_IF_HPP_INCLUDED |
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| 3 | #define BOOST_MPL_COUNT_IF_HPP_INCLUDED |
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| 4 | |
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| 5 | // Copyright Aleksey Gurtovoy 2000-2002 |
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| 6 | // |
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| 7 | // Distributed under the Boost Software License, Version 1.0. |
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| 8 | // (See accompanying file LICENSE_1_0.txt or copy at |
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| 9 | // http://www.boost.org/LICENSE_1_0.txt) |
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| 10 | // |
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| 11 | // See http://www.boost.org/libs/mpl for documentation. |
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| 12 | |
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| 13 | // $Id: count_if.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ |
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| 14 | // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ |
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| 15 | // $Revision: 49267 $ |
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| 16 | |
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| 17 | #include <boost/mpl/fold.hpp> |
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| 18 | #include <boost/mpl/next.hpp> |
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| 19 | #include <boost/mpl/integral_c.hpp> |
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| 20 | #include <boost/mpl/identity.hpp> |
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| 21 | #include <boost/mpl/eval_if.hpp> |
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| 22 | #include <boost/mpl/apply.hpp> |
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| 23 | #include <boost/mpl/aux_/msvc_eti_base.hpp> |
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| 24 | #include <boost/mpl/aux_/na_spec.hpp> |
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| 25 | #include <boost/mpl/aux_/lambda_support.hpp> |
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| 26 | #include <boost/mpl/aux_/config/forwarding.hpp> |
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| 27 | |
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| 28 | namespace boost { namespace mpl { |
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| 29 | |
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| 30 | namespace aux { |
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| 31 | |
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| 32 | template< typename Predicate > |
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| 33 | struct next_if |
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| 34 | { |
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| 35 | template< |
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| 36 | typename N |
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| 37 | , typename T |
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| 38 | > |
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| 39 | struct apply |
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| 40 | #if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING) |
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| 41 | : eval_if< |
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| 42 | typename apply1<Predicate,T>::type |
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| 43 | , next<N> |
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| 44 | , identity<N> |
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| 45 | > |
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| 46 | { |
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| 47 | #else |
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| 48 | { |
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| 49 | typedef typename eval_if< |
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| 50 | typename apply1<Predicate,T>::type |
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| 51 | , next<N> |
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| 52 | , identity<N> |
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| 53 | >::type type; |
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| 54 | #endif |
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| 55 | }; |
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| 56 | }; |
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| 57 | |
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| 58 | } // namespace aux |
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| 59 | |
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| 60 | |
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| 61 | template< |
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| 62 | typename BOOST_MPL_AUX_NA_PARAM(Sequence) |
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| 63 | , typename BOOST_MPL_AUX_NA_PARAM(Predicate) |
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| 64 | > |
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| 65 | struct count_if |
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| 66 | : aux::msvc_eti_base< typename fold< |
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| 67 | Sequence |
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| 68 | , integral_c<unsigned long,0> |
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| 69 | , protect< aux::next_if<Predicate> > |
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| 70 | >::type > |
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| 71 | { |
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| 72 | BOOST_MPL_AUX_LAMBDA_SUPPORT(2,count_if,(Sequence,Predicate)) |
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| 73 | }; |
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| 74 | |
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| 75 | BOOST_MPL_AUX_NA_SPEC(2, count_if) |
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| 76 | |
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| 77 | }} |
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| 78 | |
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| 79 | #endif // BOOST_MPL_COUNT_IF_HPP_INCLUDED |
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