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2 | #ifndef BOOST_MPL_O1_SIZE_IMPL_HPP_INCLUDED
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3 | #define BOOST_MPL_O1_SIZE_IMPL_HPP_INCLUDED
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4 |
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5 | // Copyright Aleksey Gurtovoy 2000-2004
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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 | // $Source: /cvsroot/boost/boost/boost/mpl/aux_/O1_size_impl.hpp,v $
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14 | // $Date: 2004/09/02 15:40:42 $
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15 | // $Revision: 1.4 $
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16 |
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17 | #include <boost/mpl/O1_size_fwd.hpp>
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18 | #include <boost/mpl/long.hpp>
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19 | #include <boost/mpl/if.hpp>
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20 | #include <boost/mpl/aux_/has_size.hpp>
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21 | #include <boost/mpl/aux_/config/forwarding.hpp>
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22 | #include <boost/mpl/aux_/config/static_constant.hpp>
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23 | #include <boost/mpl/aux_/config/msvc.hpp>
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24 | #include <boost/mpl/aux_/config/workaround.hpp>
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25 |
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26 | namespace boost { namespace mpl {
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27 |
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28 | // default implementation - returns 'Sequence::size' if sequence has a 'size'
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29 | // member, and -1 otherwise; conrete sequences might override it by
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30 | // specializing either the 'O1_size_impl' or the primary 'O1_size' template
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31 |
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32 | # if !BOOST_WORKAROUND(BOOST_MSVC, < 1300) \
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33 | && !BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3003))
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34 |
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35 | namespace aux {
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36 | template< typename Sequence > struct O1_size_impl
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37 | : Sequence::size
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38 | {
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39 | };
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40 | }
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41 |
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42 | template< typename Tag >
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43 | struct O1_size_impl
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44 | {
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45 | template< typename Sequence > struct apply
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46 | #if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING)
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47 | : if_<
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48 | aux::has_size<Sequence>
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49 | , aux::O1_size_impl<Sequence>
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50 | , long_<-1>
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51 | >::type
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52 | {
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53 | #else
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54 | {
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55 | typedef typename if_<
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56 | aux::has_size<Sequence>
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57 | , aux::O1_size_impl<Sequence>
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58 | , long_<-1>
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59 | >::type type;
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60 |
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61 | BOOST_STATIC_CONSTANT(long, value =
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62 | (if_<
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63 | aux::has_size<Sequence>
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64 | , aux::O1_size_impl<Sequence>
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65 | , long_<-1>
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66 | >::type::value)
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67 | );
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68 | #endif
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69 | };
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70 | };
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71 |
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72 | # else // BOOST_MSVC
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73 |
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74 | template< typename Tag >
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75 | struct O1_size_impl
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76 | {
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77 | template< typename Sequence > struct apply
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78 | : long_<-1>
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79 | {
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80 | };
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81 | };
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82 |
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83 | # endif
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84 |
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85 | }}
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86 |
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87 | #endif // BOOST_MPL_O1_SIZE_IMPL_HPP_INCLUDED
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