[Positioner] Timestamp: elapsed() & owl_timestamp()

New functions added in Timestamp:
  - elapsed()
  - elapsed(Timestamp)
  - operator owl_imestamp()

owlps-positioner/src/timestamp.cc

@@ -92,6 +92,31 @@ bool Timestamp::now()
 }
 
 
+/**
+ * @returns A Timestamp containing the time elapsed, or an empty
+ * Timestamp in case of error.
+ */
+Timestamp Timestamp::elapsed() const
+{
+  Timestamp now ;
+  if (! now.now())
+    return Timestamp() ;
+
+  return elapsed(now) ;
+}
+
+
+Timestamp Timestamp::elapsed(const Timestamp &source) const
+{
+  owl_timestamp
+  d1 = *this,
+  d2 = source,
+  elapsed ;
+  owl_time_elapsed(&d1, &d2, &elapsed) ;
+  return elapsed ;
+}
+
+
 /**
  * #timestamp nanosecond field precision is set to ms, but the value
  * is still in ns.
@@ -178,6 +203,15 @@ std::ostream& operator<<(std::ostream &os, const Timestamp &t)
 }
 
 
+inline Timestamp::operator owl_timestamp(void) const
+{
+  owl_timestamp ret ;
+  ret.tv_sec = timestamp.tv_sec ;
+  ret.tv_nsec = timestamp.tv_nsec ;
+  return ret ;
+}
+
+
 
 size_t hash_value(const Timestamp &source)
 {

owlps-positioner/src/timestamp.hh

@@ -61,11 +61,18 @@ public:
 
   ~Timestamp(void) {}
 
+  /** @name Operations */
+  //@{
   /// \brief Initialises #timestamp at the current time whith a
   /// nanosecond precision
   bool now(void) ;
-
+  /// Returns the time elapsed until now
+  Timestamp elapsed(void) const ;
+  /// Returns the time elapsed since or until \em source
+  Timestamp elapsed(const Timestamp &source) const ;
+  /// Resets #timestamp
   void clear(void) ;
+  //@}
 
   /** @name Operators */
   //@{
@@ -94,6 +101,8 @@ public:
   operator const struct timespec&(void) const ;
   /// Casts to milliseconds
   operator uint64_t(void) const ;
+  /// Casts to the owl_timestamp type from libowlps
+  operator owl_timestamp(void) const ;
   //@}
 
   /// Displays a Timestamp