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      1 
      2 #ifndef BOOST_MPL_VECTOR_AUX_FRONT_HPP_INCLUDED
      3 #define BOOST_MPL_VECTOR_AUX_FRONT_HPP_INCLUDED
      4 
      5 // Copyright Aleksey Gurtovoy 2000-2008
      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: front.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/front_fwd.hpp>
     18 #include <boost/mpl/vector/aux_/at.hpp>
     19 #include <boost/mpl/vector/aux_/tag.hpp>
     20 #include <boost/mpl/aux_/nttp_decl.hpp>
     21 #include <boost/mpl/aux_/config/typeof.hpp>
     22 #include <boost/mpl/aux_/config/ctps.hpp>
     23 
     24 namespace boost { namespace mpl {
     25 
     26 #if defined(BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES)
     27 
     28 template<>
     29 struct front_impl< aux::vector_tag >
     30 {
     31     template< typename Vector > struct apply
     32         : v_at<Vector,0>
     33     {
     34     };
     35 };
     36 
     37 #else
     38 
     39 #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
     40 
     41 template< BOOST_MPL_AUX_NTTP_DECL(long, n_) >
     42 struct front_impl< aux::vector_tag<n_> >
     43 {
     44     template< typename Vector > struct apply
     45     {
     46         typedef typename Vector::item0 type;
     47     };
     48 };
     49 
     50 #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
     51 
     52 #endif // BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES
     53 
     54 }}
     55 
     56 #endif // BOOST_MPL_VECTOR_AUX_FRONT_HPP_INCLUDED
     57