Initial Commit

.svn/pristine/ba/baec3c9e68782d1ebefdde26134c9d3d453352b2.svn-base

@@ -0,0 +1,114 @@
+#ifndef DATE_DURATION_OPERATORS_HPP___
+#define 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
+ * $Date$
+ */
+
+#include "boost/date_time/gregorian/greg_duration_types.hpp"
+#include "boost/date_time/posix_time/ptime.hpp"
+
+namespace boost {
+namespace posix_time {
+  
+  /*!@file date_duration_operators.hpp Operators for ptime 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 ptime. Result will be same 
+   * day-of-month as ptime unless original day was the last day of month.
+   * see date_time::months_duration for more details */
+  inline
+  ptime 
+  operator+(const ptime& t, const boost::gregorian::months& m)
+  {
+    return t + m.get_offset(t.date());
+  }
+  
+  /*! Adds a months object to a ptime. Result will be same 
+   * day-of-month as ptime unless original day was the last day of month.
+   * see date_time::months_duration for more details */
+  inline
+  ptime 
+  operator+=(ptime& t, const boost::gregorian::months& m)
+  {
+    // get_neg_offset returns a negative duration, so we add
+    return t += m.get_offset(t.date());
+  }
+
+  /*! Subtracts a months object and a ptime. Result will be same 
+   * day-of-month as ptime unless original day was the last day of month.
+   * see date_time::months_duration for more details */
+  inline
+  ptime 
+  operator-(const ptime& t, const boost::gregorian::months& m)
+  {
+    // get_neg_offset returns a negative duration, so we add
+    return t + m.get_neg_offset(t.date());
+  }
+  
+  /*! Subtracts a months object from a ptime. Result will be same 
+   * day-of-month as ptime unless original day was the last day of month.
+   * see date_time::months_duration for more details */
+  inline
+  ptime 
+  operator-=(ptime& t, const boost::gregorian::months& m)
+  {
+    return t += m.get_neg_offset(t.date());
+  }
+
+  // ptime & years
+  
+  /*! Adds a years object and a ptime. Result will be same 
+   * month and day-of-month as ptime unless original day was the 
+   * last day of month. see date_time::years_duration for more details */
+  inline
+  ptime 
+  operator+(const ptime& t, const boost::gregorian::years& y)
+  {
+    return t + y.get_offset(t.date());
+  }
+
+  /*! Adds a years object to a ptime. Result will be same 
+   * month and day-of-month as ptime unless original day was the 
+   * last day of month. see date_time::years_duration for more details */
+  inline
+  ptime 
+  operator+=(ptime& t, const boost::gregorian::years& y)
+  {
+    return t += y.get_offset(t.date());
+  }
+
+  /*! Subtracts a years object and a ptime. Result will be same 
+   * month and day-of-month as ptime unless original day was the 
+   * last day of month. see date_time::years_duration for more details */
+  inline
+  ptime 
+  operator-(const ptime& t, const boost::gregorian::years& y)
+  {
+    // get_neg_offset returns a negative duration, so we add
+    return t + y.get_neg_offset(t.date());
+  }
+
+  /*! Subtracts a years object from a ptime. Result will be same 
+   * month and day-of-month as ptime unless original day was the 
+   * last day of month. see date_time::years_duration for more details */
+  inline
+  ptime 
+  operator-=(ptime& t, const boost::gregorian::years& y)
+  {
+    // get_neg_offset returns a negative duration, so we add
+    return t += y.get_neg_offset(t.date());
+  }
+
+}} // namespaces
+
+#endif // DATE_DURATION_OPERATORS_HPP___