williamr@2
|
1 |
|
williamr@2
|
2 |
#ifndef BOOST_MPL_ADVANCE_HPP_INCLUDED
|
williamr@2
|
3 |
#define BOOST_MPL_ADVANCE_HPP_INCLUDED
|
williamr@2
|
4 |
|
williamr@2
|
5 |
// Copyright Aleksey Gurtovoy 2000-2004
|
williamr@2
|
6 |
//
|
williamr@2
|
7 |
// Distributed under the Boost Software License, Version 1.0.
|
williamr@2
|
8 |
// (See accompanying file LICENSE_1_0.txt or copy at
|
williamr@2
|
9 |
// http://www.boost.org/LICENSE_1_0.txt)
|
williamr@2
|
10 |
//
|
williamr@2
|
11 |
// See http://www.boost.org/libs/mpl for documentation.
|
williamr@2
|
12 |
|
williamr@2
|
13 |
// $Source: /cvsroot/boost/boost/boost/mpl/advance.hpp,v $
|
williamr@2
|
14 |
// $Date: 2004/09/02 15:40:41 $
|
williamr@2
|
15 |
// $Revision: 1.9 $
|
williamr@2
|
16 |
|
williamr@2
|
17 |
#include <boost/mpl/advance_fwd.hpp>
|
williamr@2
|
18 |
#include <boost/mpl/less.hpp>
|
williamr@2
|
19 |
#include <boost/mpl/negate.hpp>
|
williamr@2
|
20 |
#include <boost/mpl/long.hpp>
|
williamr@2
|
21 |
#include <boost/mpl/if.hpp>
|
williamr@2
|
22 |
#include <boost/mpl/tag.hpp>
|
williamr@2
|
23 |
#include <boost/mpl/apply_wrap.hpp>
|
williamr@2
|
24 |
#include <boost/mpl/aux_/advance_forward.hpp>
|
williamr@2
|
25 |
#include <boost/mpl/aux_/advance_backward.hpp>
|
williamr@2
|
26 |
#include <boost/mpl/aux_/value_wknd.hpp>
|
williamr@2
|
27 |
#include <boost/mpl/aux_/na_spec.hpp>
|
williamr@2
|
28 |
#include <boost/mpl/aux_/nttp_decl.hpp>
|
williamr@2
|
29 |
|
williamr@2
|
30 |
namespace boost { namespace mpl {
|
williamr@2
|
31 |
|
williamr@2
|
32 |
// default implementation for forward/bidirectional iterators
|
williamr@2
|
33 |
template< typename Tag >
|
williamr@2
|
34 |
struct advance_impl
|
williamr@2
|
35 |
{
|
williamr@2
|
36 |
template< typename Iterator, typename N > struct apply
|
williamr@2
|
37 |
{
|
williamr@2
|
38 |
typedef typename less< N,long_<0> >::type backward_;
|
williamr@2
|
39 |
typedef typename if_< backward_, negate<N>, N >::type offset_;
|
williamr@2
|
40 |
|
williamr@2
|
41 |
typedef typename if_<
|
williamr@2
|
42 |
backward_
|
williamr@2
|
43 |
, aux::advance_backward< BOOST_MPL_AUX_VALUE_WKND(offset_)::value >
|
williamr@2
|
44 |
, aux::advance_forward< BOOST_MPL_AUX_VALUE_WKND(offset_)::value >
|
williamr@2
|
45 |
>::type f_;
|
williamr@2
|
46 |
|
williamr@2
|
47 |
typedef typename apply_wrap1<f_,Iterator>::type type;
|
williamr@2
|
48 |
};
|
williamr@2
|
49 |
};
|
williamr@2
|
50 |
|
williamr@2
|
51 |
|
williamr@2
|
52 |
template<
|
williamr@2
|
53 |
typename BOOST_MPL_AUX_NA_PARAM(Iterator)
|
williamr@2
|
54 |
, typename BOOST_MPL_AUX_NA_PARAM(N)
|
williamr@2
|
55 |
>
|
williamr@2
|
56 |
struct advance
|
williamr@2
|
57 |
: advance_impl< typename tag<Iterator>::type >
|
williamr@2
|
58 |
::template apply<Iterator,N>
|
williamr@2
|
59 |
{
|
williamr@2
|
60 |
};
|
williamr@2
|
61 |
|
williamr@2
|
62 |
template<
|
williamr@2
|
63 |
typename Iterator
|
williamr@2
|
64 |
, BOOST_MPL_AUX_NTTP_DECL(long, N)
|
williamr@2
|
65 |
>
|
williamr@2
|
66 |
struct advance_c
|
williamr@2
|
67 |
: advance_impl< typename tag<Iterator>::type >
|
williamr@2
|
68 |
::template apply<Iterator,long_<N> >
|
williamr@2
|
69 |
{
|
williamr@2
|
70 |
};
|
williamr@2
|
71 |
|
williamr@2
|
72 |
BOOST_MPL_AUX_NA_SPEC(2, advance)
|
williamr@2
|
73 |
|
williamr@2
|
74 |
}}
|
williamr@2
|
75 |
|
williamr@2
|
76 |
#endif // BOOST_MPL_ADVANCE_HPP_INCLUDED
|