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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 // $Id$
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14 // $Date$
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15 // $Revision$
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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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