1/*=============================================================================
2 Copyright (c) 2001-2011 Joel de Guzman
3 Copyright (c) 2005-2006 Dan Marsden
4
5 Distributed under the Boost Software License, Version 1.0. (See accompanying
6 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
7==============================================================================*/
8#if !defined(FUSION_DISTANCE_IMPL_13122005_2139)
9#define FUSION_DISTANCE_IMPL_13122005_2139
10
11#include <boost/fusion/support/config.hpp>
12#include <boost/fusion/iterator/distance.hpp>
13
14namespace boost { namespace fusion {
15
16 struct transform_view_iterator_tag;
17 struct transform_view_iterator2_tag;
18
19 namespace extension
20 {
21 template<typename Tag>
22 struct distance_impl;
23
24 // Unary Version
25 template<>
26 struct distance_impl<transform_view_iterator_tag>
27 {
28 template<typename First, typename Last>
29 struct apply
30 : result_of::distance<typename First::first_type, typename Last::first_type>
31 {
32 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
33 static
34 typename result_of::distance<typename First::first_type, typename Last::first_type>::type
35 call(First const& first, Last const& last)
36 {
37 return boost::fusion::distance(first.first, last.first);
38 }
39 };
40 };
41
42 // Binary Version
43 template<>
44 struct distance_impl<transform_view_iterator2_tag>
45 {
46 template<typename First, typename Last>
47 struct apply
48 : result_of::distance<typename First::first1_type, typename Last::first1_type>
49 {
50 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
51 static
52 typename result_of::distance<typename First::first1_type, typename Last::first1_type>::type
53 call(First const& first, Last const& last)
54 {
55 return boost::fusion::distance(first.first1, last.first1);
56 }
57 };
58 };
59 }
60}}
61
62#endif
63