1/*=============================================================================
2 Copyright (c) 2011 Eric Niebler
3
4 Distributed under the Boost Software License, Version 1.0. (See accompanying
5 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6==============================================================================*/
7
8#if !defined(BOOST_FUSION_SINGLE_VIEW_DISTANCE_IMPL_JUL_07_2011_1348PM)
9#define BOOST_FUSION_SINGLE_VIEW_DISTANCE_IMPL_JUL_07_2011_1348PM
10
11#include <boost/fusion/support/config.hpp>
12#include <boost/mpl/minus.hpp>
13
14namespace boost { namespace fusion
15{
16 struct single_view_iterator_tag;
17
18 namespace extension
19 {
20 template<typename Tag>
21 struct distance_impl;
22
23 template<>
24 struct distance_impl<single_view_iterator_tag>
25 {
26 template<typename First, typename Last>
27 struct apply
28 : mpl::minus<typename Last::position, typename First::position>
29 {
30 typedef typename mpl::minus<typename Last::position,
31 typename First::position>::type type;
32
33 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
34 static type
35 call(First const& /*first*/, Last const& /*last*/)
36 {
37 return type();
38 }
39 };
40 };
41 }
42
43}}
44
45#endif
46

source code of include/boost/fusion/view/single_view/detail/distance_impl.hpp