--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/imgtools/imglib/boostlibrary/boost/date_time/local_time/date_duration_operators.hpp	Mon May 10 19:54:49 2010 +0100
@@ -0,0 +1,115 @@
+#ifndef LOCAL_TIME_DATE_DURATION_OPERATORS_HPP___
+#define LOCAL_TIME_DATE_DURATION_OPERATORS_HPP___
+                                                                                
+/* Copyright (c) 2004 CrystalClear Software, Inc.
+ * Subject to the Boost Software License, Version 1.0. 
+ * (See accompanying file LICENSE_1_0.txt or 
+ * http://www.boost.org/LICENSE_1_0.txt)
+ * Author: Jeff Garland, Bart Garst
+ * $Date: 2008-02-27 15:00:24 -0500 (Wed, 27 Feb 2008) $
+ */
+
+#include "boost/date_time/gregorian/greg_duration_types.hpp"
+#include "boost/date_time/local_time/local_date_time.hpp"
+
+namespace boost {
+namespace local_time {
+  
+  /*!@file date_duration_operators.hpp Operators for local_date_time and 
+   * optional gregorian types. Operators use snap-to-end-of-month behavior. 
+   * Further details on this behavior can be found in reference for 
+   * date_time/date_duration_types.hpp and documentation for 
+   * month and year iterators.
+   */
+ 
+
+  /*! Adds a months object and a local_date_time. Result will be same 
+   * day-of-month as local_date_time unless original day was the last day of month.
+   * see date_time::months_duration for more details */
+  inline
+  local_date_time 
+  operator+(const local_date_time& t, const boost::gregorian::months& m)
+  {
+    return t + m.get_offset(t.utc_time().date());
+  }
+  
+  /*! Adds a months object to a local_date_time. Result will be same 
+   * day-of-month as local_date_time unless original day was the last day of month.
+   * see date_time::months_duration for more details */
+  inline
+  local_date_time 
+  operator+=(local_date_time& t, const boost::gregorian::months& m)
+  {
+    return t += m.get_offset(t.utc_time().date());
+  }
+
+  /*! Subtracts a months object and a local_date_time. Result will be same 
+   * day-of-month as local_date_time unless original day was the last day of month.
+   * see date_time::months_duration for more details */
+  inline
+  local_date_time 
+  operator-(const local_date_time& t, const boost::gregorian::months& m)
+  {
+    // get_neg_offset returns a negative duration, so we add
+    return t + m.get_neg_offset(t.utc_time().date());
+  }
+  
+  /*! Subtracts a months object from a local_date_time. Result will be same 
+   * day-of-month as local_date_time unless original day was the last day of month.
+   * see date_time::months_duration for more details */
+  inline
+  local_date_time 
+  operator-=(local_date_time& t, const boost::gregorian::months& m)
+  {
+    // get_neg_offset returns a negative duration, so we add
+    return t += m.get_neg_offset(t.utc_time().date());
+  }
+
+  // local_date_time & years
+  
+  /*! Adds a years object and a local_date_time. Result will be same 
+   * month and day-of-month as local_date_time unless original day was the 
+   * last day of month. see date_time::years_duration for more details */
+  inline
+  local_date_time 
+  operator+(const local_date_time& t, const boost::gregorian::years& y)
+  {
+    return t + y.get_offset(t.utc_time().date());
+  }
+
+  /*! Adds a years object to a local_date_time. Result will be same 
+   * month and day-of-month as local_date_time unless original day was the 
+   * last day of month. see date_time::years_duration for more details */
+  inline
+  local_date_time 
+  operator+=(local_date_time& t, const boost::gregorian::years& y)
+  {
+    return t += y.get_offset(t.utc_time().date());
+  }
+
+  /*! Subtracts a years object and a local_date_time. Result will be same 
+   * month and day-of-month as local_date_time unless original day was the 
+   * last day of month. see date_time::years_duration for more details */
+  inline
+  local_date_time 
+  operator-(const local_date_time& t, const boost::gregorian::years& y)
+  {
+    // get_neg_offset returns a negative duration, so we add
+    return t + y.get_neg_offset(t.utc_time().date());
+  }
+
+  /*! Subtracts a years object from a local_date_time. Result will be same 
+   * month and day-of-month as local_date_time unless original day was the 
+   * last day of month. see date_time::years_duration for more details */
+  inline
+  local_date_time 
+  operator-=(local_date_time& t, const boost::gregorian::years& y)
+  {
+    // get_neg_offset returns a negative duration, so we add
+    return t += y.get_neg_offset(t.utc_time().date());
+  }
+
+
+}} // namespaces
+
+#endif // LOCAL_TIME_DATE_DURATION_OPERATORS_HPP___