+ Added tz::delay::elapsed()

src/tz/core/time.cpp

@@ -16,7 +16,12 @@ namespace tz
 
 	bool delay::done() const
 	{
-		return (this->begin_systime + this->delay_length) <= system_time();
+		return this->elapsed() >= this->delay_length;
+	}
+
+	duration delay::elapsed() const
+	{
+		return this->begin_systime - system_time();
 	}
 
 	void delay::reset()

src/tz/core/time.hpp

@@ -163,6 +163,10 @@ namespace tz
 		 * Query as to whether the delay length has passed since construction of the delay object.
 		 */
 		bool done() const;
+		/**
+		 * Retrieve how much time has passed since the delay began. If the elapsed time is longer than or equal to the delay length, the delay is `done()`.
+		 */
+		duration elapsed() const;
 		/**
 		 * Reset the delay object. The instant a delay object is reset, 0 seconds have elapsed since the "construction" of the object. You can use this to check for the same delay again in the future.
 		 */