Support retrieving elapsed duration from a scoped profiler

libs/prof/include/psemek/prof/profiler.hpp

@@ -24,6 +24,11 @@ namespace psemek::prof
 			push(name, std::chrono::duration_cast<std::chrono::duration<double>>(duration));
 		}
 
+		double duration() const
+		{
+			return clock_.count();
+		}
+
 	private:
 		util::clock<std::chrono::duration<double>, std::chrono::high_resolution_clock> clock_;
 	};