@@ -188,10 +188,15 @@
 	size_t location;
 	/*! The length of the range */
 	size_t length;
 } of_range_t;
 
+/*!
+ * @brief A time interval in seconds.
+ */
+typedef double of_time_interval_t;
+
 /*!
  * @brief A point.
  */
 typedef struct of_point_t {
 	/*! The x coordinate of the point */
@@ -730,11 +735,11 @@
  *
  * @param selector The selector to perform
  * @param delay The delay after which the selector will be performed
  */
 - (void)performSelector: (SEL)selector
-	     afterDelay: (double)delay;
+	     afterDelay: (of_time_interval_t)delay;
 
 /*!
  * @brief Performs the specified selector with the specified object after the
  *	  specified delay.
  *
@@ -743,11 +748,11 @@
  *		 selector
  * @param delay The delay after which the selector will be performed
  */
 - (void)performSelector: (SEL)selector
 	     withObject: (id)object
-	     afterDelay: (double)delay;
+	     afterDelay: (of_time_interval_t)delay;
 
 /*!
  * @brief Performs the specified selector with the specified objects after the
  *	  specified delay.
  *
@@ -759,11 +764,11 @@
  * @param delay The delay after which the selector will be performed
  */
 - (void)performSelector: (SEL)selector
 	     withObject: (id)object1
 	     withObject: (id)object2
-	     afterDelay: (double)delay;
+	     afterDelay: (of_time_interval_t)delay;
 
 #ifdef OF_HAVE_THREADS
 /*!
  * @brief Performs the specified selector on the specified thread.
  *
@@ -854,11 +859,11 @@
  * @param thread The thread on which to perform the selector
  * @param delay The delay after which the selector will be performed
  */
 - (void)performSelector: (SEL)selector
 	       onThread: (OFThread*)thread
-	     afterDelay: (double)delay;
+	     afterDelay: (of_time_interval_t)delay;
 
 /*!
  * @brief Performs the specified selector on the specified thread with the
  *	  specified object after the specified delay.
  *
@@ -869,11 +874,11 @@
  * @param delay The delay after which the selector will be performed
  */
 - (void)performSelector: (SEL)selector
 	       onThread: (OFThread*)thread
 	     withObject: (id)object
-	     afterDelay: (double)delay;
+	     afterDelay: (of_time_interval_t)delay;
 
 /*!
  * @brief Performs the specified selector on the specified thread with the
  *	  specified objects after the specified delay.
  *
@@ -887,11 +892,11 @@
  */
 - (void)performSelector: (SEL)selector
 	       onThread: (OFThread*)thread
 	     withObject: (id)object1
 	     withObject: (id)object2
-	     afterDelay: (double)delay;
+	     afterDelay: (of_time_interval_t)delay;
 #endif
 
 /*!
  * @brief This method is called when @ref resolveClassMethod: or
  *	  @ref resolveInstanceMethod: returned false. It should return a target