[857] | 1 |
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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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