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.svn/pristine/16/1614febc7062da5f77eec6e914b70f28b4788cac.svn-base

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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>
+
+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