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authorRemko Tronçon <git@el-tramo.be>2009-06-01 08:48:42 (GMT)
committerRemko Tronçon <git@el-tramo.be>2009-06-01 09:24:28 (GMT)
commit2812bddd81f8a1b804c7460f4e14cd0aa393d129 (patch)
treed46294f35150c4f0f43deaf2d31fceaf945ae715 /3rdParty/Boost/boost/next_prior.hpp
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+// Boost next_prior.hpp header file ---------------------------------------//
+
+// (C) Copyright Dave Abrahams and Daniel Walker 1999-2003. 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)
+
+// See http://www.boost.org/libs/utility for documentation.
+
+// Revision History
+// 13 Dec 2003 Added next(x, n) and prior(x, n) (Daniel Walker)
+
+#ifndef BOOST_NEXT_PRIOR_HPP_INCLUDED
+#define BOOST_NEXT_PRIOR_HPP_INCLUDED
+
+#include <iterator>
+
+namespace boost {
+
+// Helper functions for classes like bidirectional iterators not supporting
+// operator+ and operator-
+//
+// Usage:
+// const std::list<T>::iterator p = get_some_iterator();
+// const std::list<T>::iterator prev = boost::prior(p);
+// const std::list<T>::iterator next = boost::next(prev, 2);
+
+// Contributed by Dave Abrahams
+
+template <class T>
+inline T next(T x) { return ++x; }
+
+template <class T, class Distance>
+inline T next(T x, Distance n)
+{
+ std::advance(x, n);
+ return x;
+}
+
+template <class T>
+inline T prior(T x) { return --x; }
+
+template <class T, class Distance>
+inline T prior(T x, Distance n)
+{
+ std::advance(x, -n);
+ return x;
+}
+
+} // namespace boost
+
+#endif // BOOST_NEXT_PRIOR_HPP_INCLUDED