/*============================================================================= | |
Copyright (c) 2001-2006 Joel de Guzman | |
Copyright (c) 2005-2006 Dan Marsden | |
Distributed under the Boost Software License, Version 1.0. (See accompanying | |
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
==============================================================================*/ | |
#if !defined(FUSION_PREV_IMPL_13122005_2110) | |
#define FUSION_PREV_IMPL_13122005_2110 | |
#include <boost/fusion/iterator/prior.hpp> | |
namespace boost { namespace fusion | |
{ | |
struct transform_view_iterator_tag; | |
struct transform_view_iterator2_tag; | |
template<typename First, typename F> | |
struct transform_view_iterator; | |
template <typename First1, typename First2, typename F> | |
struct transform_view_iterator2; | |
namespace extension | |
{ | |
template<typename Tag> | |
struct prior_impl; | |
// Unary Version | |
template<> | |
struct prior_impl<transform_view_iterator_tag> | |
{ | |
template<typename Iterator> | |
struct apply | |
{ | |
typedef typename Iterator::first_type first_type; | |
typedef typename result_of::prior<first_type>::type prior_type; | |
typedef typename Iterator::transform_type transform_type; | |
typedef transform_view_iterator<prior_type, transform_type> type; | |
static type | |
call(Iterator const& i) | |
{ | |
return type(fusion::prior(i.first), i.f); | |
} | |
}; | |
}; | |
// Binary Version | |
template<> | |
struct prior_impl<transform_view_iterator2_tag> | |
{ | |
template<typename Iterator> | |
struct apply | |
{ | |
typedef typename Iterator::first1_type first1_type; | |
typedef typename Iterator::first2_type first2_type; | |
typedef typename result_of::prior<first1_type>::type prior1_type; | |
typedef typename result_of::prior<first2_type>::type prior2_type; | |
typedef typename Iterator::transform_type transform_type; | |
typedef transform_view_iterator2<prior1_type, prior2_type, transform_type> type; | |
static type | |
call(Iterator const& i) | |
{ | |
return type(fusion::prior(i.first1), fusion::prior(i.first2), i.f); | |
} | |
}; | |
}; | |
} | |
}} | |
#endif |