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