Update of /cvsroot/boost/boost/boost/fusion/sequence/adapted/variant
In directory sc8-pr-cvs3.sourceforge.net:/tmp/cvs-serv10403/adapted/variant
Added Files:
tag_of.hpp variant_iterator.hpp
Log Message:
variant as a fusion sequence
--- NEW FILE: tag_of.hpp ---
/*=============================================================================
Copyright (c) 2001-2006 Joel de Guzman
Copyright (c) 2005-2006 Dan Marsden
Use, modification and distribution is subject to 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(BOOST_FUSION_VARIANT_TAG_OF_12112006_1704)
#define BOOST_FUSION_VARIANT_TAG_OF_12112006_1704
#include <boost/fusion/support/tag_of_fwd.hpp>
#include <boost/variant/variant_fwd.hpp>
namespace boost { namespace fusion
{
struct variant_tag;
namespace traits
{
template<BOOST_VARIANT_ENUM_PARAMS(typename T)>
struct tag_of<boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> >
{
typedef variant_tag type;
};
}
}}
#endif
--- NEW FILE: variant_iterator.hpp ---
/*=============================================================================
Copyright (c) 2001-2006 Joel de Guzman
Copyright (c) 2005-2006 Dan Marsden
Use, modification and distribution is subject to 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(BOOST_FUSION_VARIANT_ITERATOR_12112006_1617)
#define BOOST_FUSION_VARIANT_ITERATOR_12112006_1617
#include <boost/fusion/iterator/iterator_facade.hpp>
#include <boost/mpl/next.hpp>
#include <boost/mpl/int.hpp>
#include <boost/mpl/distance.hpp>
#include <boost/mpl/deref.hpp>
#include <boost/mpl/eval_if.hpp>
#include <boost/type_traits/is_const.hpp>
#include <boost/type_traits/add_const.hpp>
namespace boost { namespace fusion {
struct forward_traversal_tag;
template<typename Variant, typename Iterator>
struct variant_iterator
: iterator_facade<variant_iterator<Variant, Iterator>,
forward_traversal_tag>
{
typedef Variant variant_type;
typedef Iterator iterator;
variant_iterator(Variant& var)
: var_(var) {}
Variant& var_;
template<typename Iterator>
struct next
{
typedef variant_iterator<
typename Iterator::variant_type,
typename mpl::next<typename Iterator::iterator>::type> type;
static type
call(Iterator const& i)
{
return type(i.var_);
}
};
template<typename I1, typename I2>
struct distance
: mpl::distance<
typename I1::iterator,
typename I2::iterator>
{
typedef typename mpl::distance<
typename I1::iterator,
typename I2::iterator>::type type;
static type call(I1 const& i1, I2 const& i2)
{
return type();
}
};
template<typename Iterator>
struct value_of
: mpl::deref<typename Iterator::iterator>
{};
template <typename Iterator>
struct deref
{
typedef typename mpl::eval_if<
is_const<typename Iterator::variant_type>,
typename add_const<typename mpl::deref<typename
Iterator::iterator>::type>,
typename mpl::deref<typename Iterator::iterator>
>::type
type;
static type
call(Iterator const & it)
{
typedef typename mpl::deref<typename Iterator::iterator>::type
type;
type* result = get<type>(&it.var_);
return result ? *result : type();
}
};
};
}}
#endif
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