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/src/contrib/boost/mpl/aux_/push_front_impl.hpp

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 1
 2#ifndef BOOST_MPL_AUX_PUSH_FRONT_IMPL_HPP_INCLUDED
 3#define BOOST_MPL_AUX_PUSH_FRONT_IMPL_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: push_front_impl.hpp 55679 2009-08-20 07:50:16Z agurtovoy $
14// $Date: 2009-08-20 03:50:16 -0400 (Thu, 20 Aug 2009) $
15// $Revision: 55679 $
16
17#include <boost/mpl/push_front_fwd.hpp>
18#include <boost/mpl/assert.hpp>
19#include <boost/mpl/aux_/has_type.hpp>
20#include <boost/mpl/aux_/traits_lambda_spec.hpp>
21#include <boost/mpl/aux_/config/forwarding.hpp>
22#include <boost/mpl/aux_/config/static_constant.hpp>
23
24#include <boost/type_traits/is_same.hpp>
25
26namespace boost { namespace mpl {
27
28struct has_push_front_arg {};
29
30// agurt 05/feb/04: no default implementation; the stub definition is needed 
31// to enable the default 'has_push_front' implementation below
32
33template< typename Tag >
34struct push_front_impl
35{
36    template< typename Sequence, typename T > struct apply
37    {
38        // should be instantiated only in the context of 'has_push_front_impl';
39        // if you've got an assert here, you are requesting a 'push_front' 
40        // specialization that doesn't exist.
41        BOOST_MPL_ASSERT_MSG(
42              ( boost::is_same< T, has_push_front_arg >::value )
43            , REQUESTED_PUSH_FRONT_SPECIALIZATION_FOR_SEQUENCE_DOES_NOT_EXIST
44            , ( Sequence )
45            );
46    };
47};
48
49template< typename Tag >
50struct has_push_front_impl
51{
52    template< typename Seq > struct apply
53#if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING)
54        : aux::has_type< push_front< Seq, has_push_front_arg > >
55    {
56#else
57    {
58        typedef aux::has_type< push_front< Seq, has_push_front_arg > > type;
59        BOOST_STATIC_CONSTANT(bool, value = 
60              (aux::has_type< push_front< Seq, has_push_front_arg > >::value)
61            );
62#endif
63    };
64};
65
66BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(2, push_front_impl)
67BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(1, has_push_front_impl)
68
69}}
70
71#endif // BOOST_MPL_AUX_PUSH_FRONT_IMPL_HPP_INCLUDED