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os/ossrv/ossrv_pub/boost_apis/boost/mpl/count_if.hpp
author sl@SLION-WIN7.fritz.box
Fri, 15 Jun 2012 03:10:57 +0200
changeset 0 bde4ae8d615e
permissions -rw-r--r--
First public contribution. 
     1 

     2 #ifndef BOOST_MPL_COUNT_IF_HPP_INCLUDED

     3 #define BOOST_MPL_COUNT_IF_HPP_INCLUDED

     4 

     5 // Copyright Aleksey Gurtovoy 2000-2002

     6 //

     7 // Distributed under the Boost Software License, Version 1.0. 

     8 // (See accompanying file LICENSE_1_0.txt or copy at 

     9 // http://www.boost.org/LICENSE_1_0.txt)

    10 //

    11 // See http://www.boost.org/libs/mpl for documentation.

    12 

    13 // $Source: /cvsroot/boost/boost/boost/mpl/count_if.hpp,v $

    14 // $Date: 2004/09/02 15:40:41 $

    15 // $Revision: 1.5 $

    16 

    17 #include <boost/mpl/fold.hpp>

    18 #include <boost/mpl/next.hpp>

    19 #include <boost/mpl/integral_c.hpp>

    20 #include <boost/mpl/identity.hpp>

    21 #include <boost/mpl/eval_if.hpp>

    22 #include <boost/mpl/apply.hpp>

    23 #include <boost/mpl/aux_/msvc_eti_base.hpp>

    24 #include <boost/mpl/aux_/na_spec.hpp>

    25 #include <boost/mpl/aux_/lambda_support.hpp>

    26 #include <boost/mpl/aux_/config/forwarding.hpp>

    27 

    28 namespace boost { namespace mpl {

    29 

    30 namespace aux {

    31 

    32 template< typename Predicate >

    33 struct next_if

    34 {

    35     template<

    36           typename N

    37         , typename T

    38         >

    39     struct apply

    40 #if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING)

    41         : eval_if<

    42               typename apply1<Predicate,T>::type

    43             , next<N>

    44             , identity<N>

    45             >

    46     {

    47 #else

    48     {

    49         typedef typename eval_if<

    50               typename apply1<Predicate,T>::type

    51             , next<N>

    52             , identity<N>

    53             >::type type;

    54 #endif

    55     };

    56 };

    57 

    58 } // namespace aux

    59 

    60 

    61 template<

    62       typename BOOST_MPL_AUX_NA_PARAM(Sequence)

    63     , typename BOOST_MPL_AUX_NA_PARAM(Predicate)

    64     >

    65 struct count_if

    66     : aux::msvc_eti_base< typename fold<

    67           Sequence

    68         , integral_c<unsigned long,0>

    69         , protect< aux::next_if<Predicate> >

    70         >::type >

    71 {

    72     BOOST_MPL_AUX_LAMBDA_SUPPORT(2,count_if,(Sequence,Predicate))

    73 };

    74 

    75 BOOST_MPL_AUX_NA_SPEC(2, count_if)

    76 

    77 }}

    78 

    79 #endif // BOOST_MPL_COUNT_IF_HPP_INCLUDED
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