boost/mpl/aux_/size_impl.hpp

   1
   2 #ifndef BOOST_MPL_AUX_SIZE_IMPL_HPP_INCLUDED
   3 #define BOOST_MPL_AUX_SIZE_IMPL_HPP_INCLUDED
   4
   5 // Copyright Aleksey Gurtovoy 2000-2004
   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 // $Id: size_impl.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
  14 // $Date: 2008-10-10 23:19:02 -0700 (Fri, 10 Oct 2008) $
  15 // $Revision: 49267 $
  16
  17 #include <boost/mpl/size_fwd.hpp>
  18 #include <boost/mpl/begin_end.hpp>
  19 #include <boost/mpl/distance.hpp>
  20 #include <boost/mpl/aux_/traits_lambda_spec.hpp>
  21 #include <boost/mpl/aux_/config/workaround.hpp>
  22
  23 namespace boost { namespace mpl {
  24
  25 // default implementation; conrete sequences might override it by
  26 // specializing either the 'size_impl' or the primary 'size' template
  27
  28 template< typename Tag >
  29 struct size_impl
  30 {
  31     template< typename Sequence > struct apply
  32 #if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x561))
  33         : distance<
  34               typename begin<Sequence>::type
  35             , typename end<Sequence>::type
  36             >
  37     {
  38 #else
  39     {
  40         typedef typename distance<
  41               typename begin<Sequence>::type
  42             , typename end<Sequence>::type
  43             >::type type;
  44 #endif
  45     };
  46 };
  47
  48 BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(1, size_impl)
  49
  50 }}
  51
  52 #endif // BOOST_MPL_AUX_SIZE_IMPL_HPP_INCLUDED