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- // Copyright Neil Groves 2009. 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)
- //
- //
- // For more information, see http://www.boost.org/libs/range/
- //
- #ifndef BOOST_RANGE_DETAIL_RANGE_RETURN_HPP_INCLUDED
- #define BOOST_RANGE_DETAIL_RANGE_RETURN_HPP_INCLUDED
- #include <boost/range/begin.hpp>
- #include <boost/range/end.hpp>
- #include <boost/range/iterator_range.hpp>
- #include <boost/next_prior.hpp>
- namespace boost
- {
- enum range_return_value
- {
- // (*) indicates the most common values
- return_found, // only the found resulting iterator (*)
- return_next, // next(found) iterator
- return_prior, // prior(found) iterator
- return_begin_found, // [begin, found) range (*)
- return_begin_next, // [begin, next(found)) range
- return_begin_prior, // [begin, prior(found)) range
- return_found_end, // [found, end) range (*)
- return_next_end, // [next(found), end) range
- return_prior_end, // [prior(found), end) range
- return_begin_end // [begin, end) range
- };
- template< class SinglePassRange, range_return_value >
- struct range_return
- {
- typedef boost::iterator_range<
- BOOST_DEDUCED_TYPENAME range_iterator<SinglePassRange>::type > type;
- static type pack(BOOST_DEDUCED_TYPENAME range_iterator<SinglePassRange>::type found,
- SinglePassRange& rng)
- {
- return type(found, boost::end(rng));
- }
- };
- template< class SinglePassRange >
- struct range_return< SinglePassRange, return_found >
- {
- typedef BOOST_DEDUCED_TYPENAME range_iterator<SinglePassRange>::type type;
- static type pack(type found, SinglePassRange&)
- {
- return found;
- }
- };
- template< class SinglePassRange >
- struct range_return< SinglePassRange, return_next >
- {
- typedef BOOST_DEDUCED_TYPENAME range_iterator<SinglePassRange>::type type;
- static type pack(type found, SinglePassRange& rng)
- {
- return found == boost::end(rng)
- ? found
- : boost::next(found);
- }
- };
- template< class BidirectionalRange >
- struct range_return< BidirectionalRange, return_prior >
- {
- typedef BOOST_DEDUCED_TYPENAME range_iterator<BidirectionalRange>::type type;
- static type pack(type found, BidirectionalRange& rng)
- {
- return found == boost::begin(rng)
- ? found
- : boost::prior(found);
- }
- };
- template< class SinglePassRange >
- struct range_return< SinglePassRange, return_begin_found >
- {
- typedef boost::iterator_range<
- BOOST_DEDUCED_TYPENAME range_iterator<SinglePassRange>::type > type;
- static type pack(BOOST_DEDUCED_TYPENAME range_iterator<SinglePassRange>::type found,
- SinglePassRange& rng)
- {
- return type(boost::begin(rng), found);
- }
- };
- template< class SinglePassRange >
- struct range_return< SinglePassRange, return_begin_next >
- {
- typedef boost::iterator_range<
- BOOST_DEDUCED_TYPENAME range_iterator<SinglePassRange>::type > type;
- static type pack(BOOST_DEDUCED_TYPENAME range_iterator<SinglePassRange>::type found,
- SinglePassRange& rng)
- {
- return type( boost::begin(rng),
- found == boost::end(rng) ? found : boost::next(found) );
- }
- };
- template< class BidirectionalRange >
- struct range_return< BidirectionalRange, return_begin_prior >
- {
- typedef boost::iterator_range<
- BOOST_DEDUCED_TYPENAME range_iterator<BidirectionalRange>::type > type;
- static type pack(BOOST_DEDUCED_TYPENAME range_iterator<BidirectionalRange>::type found,
- BidirectionalRange& rng)
- {
- return type( boost::begin(rng),
- found == boost::begin(rng) ? found : boost::prior(found) );
- }
- };
- template< class SinglePassRange >
- struct range_return< SinglePassRange, return_found_end >
- {
- typedef boost::iterator_range<
- BOOST_DEDUCED_TYPENAME range_iterator<SinglePassRange>::type > type;
- static type pack(BOOST_DEDUCED_TYPENAME range_iterator<SinglePassRange>::type found,
- SinglePassRange& rng)
- {
- return type(found, boost::end(rng));
- }
- };
- template< class SinglePassRange >
- struct range_return< SinglePassRange, return_next_end >
- {
- typedef boost::iterator_range<
- BOOST_DEDUCED_TYPENAME range_iterator<SinglePassRange>::type > type;
- static type pack(BOOST_DEDUCED_TYPENAME range_iterator<SinglePassRange>::type found,
- SinglePassRange& rng)
- {
- return type( found == boost::end(rng) ? found : boost::next(found),
- boost::end(rng) );
- }
- };
- template< class BidirectionalRange >
- struct range_return< BidirectionalRange, return_prior_end >
- {
- typedef boost::iterator_range<
- BOOST_DEDUCED_TYPENAME range_iterator<BidirectionalRange>::type > type;
- static type pack(BOOST_DEDUCED_TYPENAME range_iterator<BidirectionalRange>::type found,
- BidirectionalRange& rng)
- {
- return type( found == boost::begin(rng) ? found : boost::prior(found),
- boost::end(rng) );
- }
- };
- template< class SinglePassRange >
- struct range_return< SinglePassRange, return_begin_end >
- {
- typedef boost::iterator_range<
- BOOST_DEDUCED_TYPENAME range_iterator<SinglePassRange>::type > type;
- static type pack(BOOST_DEDUCED_TYPENAME range_iterator<SinglePassRange>::type,
- SinglePassRange& rng)
- {
- return type(boost::begin(rng), boost::end(rng));
- }
- };
- }
- #endif // include guard
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