source: NonGTP/Boost/boost/mpl/aux_/front_impl.hpp @ 857

Revision 857, 1.1 KB checked in by igarcia, 19 years ago (diff)
Line 
1
2#ifndef BOOST_MPL_AUX_FRONT_IMPL_HPP_INCLUDED
3#define BOOST_MPL_AUX_FRONT_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// $Source: /cvsroot/boost/boost/boost/mpl/aux_/front_impl.hpp,v $
14// $Date: 2004/09/02 15:40:43 $
15// $Revision: 1.4 $
16
17#include <boost/mpl/front_fwd.hpp>
18#include <boost/mpl/begin_end.hpp>
19#include <boost/mpl/deref.hpp>
20#include <boost/mpl/aux_/traits_lambda_spec.hpp>
21
22namespace boost { namespace mpl {
23
24// default implementation; conrete sequences might override it by
25// specializing either the 'front_impl' or the primary 'front' template
26
27template< typename Tag >
28struct front_impl
29{
30    template< typename Sequence > struct apply
31    {
32        typedef typename begin<Sequence>::type iter_;
33        typedef typename deref<iter_>::type type;
34    };
35};
36
37BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(1,front_impl)
38
39}}
40
41#endif // BOOST_MPL_AUX_FRONT_IMPL_HPP_INCLUDED
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