1 |
1 |
2 #ifndef BOOST_MPL_LIST_AUX_FRONT_HPP_INCLUDED |
2 #ifndef BOOST_MPL_FRONT_HPP_INCLUDED |
3 #define BOOST_MPL_LIST_AUX_FRONT_HPP_INCLUDED |
3 #define BOOST_MPL_FRONT_HPP_INCLUDED |
4 |
4 |
5 // Copyright Aleksey Gurtovoy 2000-2004 |
5 // Copyright Aleksey Gurtovoy 2000-2004 |
6 // |
6 // |
7 // Distributed under the Boost Software License, Version 1.0. |
7 // Distributed under the Boost Software License, Version 1.0. |
8 // (See accompanying file LICENSE_1_0.txt or copy at |
8 // (See accompanying file LICENSE_1_0.txt or copy at |
9 // http://www.boost.org/LICENSE_1_0.txt) |
9 // http://www.boost.org/LICENSE_1_0.txt) |
10 // |
10 // |
11 // See http://www.boost.org/libs/mpl for documentation. |
11 // See http://www.boost.org/libs/mpl for documentation. |
12 |
12 |
13 // $Source: /cvsroot/boost/boost/boost/mpl/vector/aux_/front.hpp,v $ |
13 // $Source: /cvsroot/boost/boost/boost/mpl/front.hpp,v $ |
14 // $Date: 2004/09/02 15:41:19 $ |
14 // $Date: 2004/09/02 15:40:41 $ |
15 // $Revision: 1.4 $ |
15 // $Revision: 1.4 $ |
16 |
16 |
17 #include <boost/mpl/front_fwd.hpp> |
17 #include <boost/mpl/front_fwd.hpp> |
18 #include <boost/mpl/vector/aux_/at.hpp> |
18 #include <boost/mpl/aux_/front_impl.hpp> |
19 #include <boost/mpl/vector/aux_/tag.hpp> |
19 #include <boost/mpl/sequence_tag.hpp> |
20 #include <boost/mpl/aux_/nttp_decl.hpp> |
20 #include <boost/mpl/aux_/na_spec.hpp> |
21 #include <boost/mpl/aux_/config/typeof.hpp> |
21 #include <boost/mpl/aux_/lambda_support.hpp> |
22 #include <boost/mpl/aux_/config/ctps.hpp> |
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23 |
22 |
24 namespace boost { namespace mpl { |
23 namespace boost { namespace mpl { |
25 |
24 |
26 #if defined(BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES) |
25 template< |
27 |
26 typename BOOST_MPL_AUX_NA_PARAM(Sequence) |
28 template<> |
27 > |
29 struct front_impl< aux::vector_tag > |
28 struct front |
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29 : front_impl< typename sequence_tag<Sequence>::type > |
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30 ::template apply< Sequence > |
30 { |
31 { |
31 template< typename Vector > struct apply |
32 BOOST_MPL_AUX_LAMBDA_SUPPORT(1,front,(Sequence)) |
32 : v_at<Vector,0> |
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33 { |
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34 }; |
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35 }; |
33 }; |
36 |
34 |
37 #else |
35 BOOST_MPL_AUX_NA_SPEC(1, front) |
38 |
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39 #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) |
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40 |
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41 template< BOOST_MPL_AUX_NTTP_DECL(long, n_) > |
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42 struct front_impl< aux::vector_tag<n_> > |
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43 { |
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44 template< typename Vector > struct apply |
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45 { |
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46 typedef typename Vector::item0 type; |
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47 }; |
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48 }; |
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49 |
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50 #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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51 |
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52 #endif // BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES |
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53 |
36 |
54 }} |
37 }} |
55 |
38 |
56 #endif // BOOST_MPL_LIST_AUX_FRONT_HPP_INCLUDED |
39 #endif // BOOST_MPL_FRONT_HPP_INCLUDED |