From 25a9b4e339867bacb8ba5b92b955420cec86596a Mon Sep 17 00:00:00 2001
From: Dirk Thomas <dirk-thomas@users.noreply.github.com>
Date: Mon, 20 Aug 2018 08:58:32 -0700
Subject: [PATCH] add Time::is_zero and Duration::seconds (#536)

add Duration::seconds
---
 rclcpp/include/rclcpp/duration.hpp | 7 +++++++
 rclcpp/src/rclcpp/duration.cpp     | 6 ++++++
 2 files changed, 13 insertions(+)

diff --git a/rclcpp/include/rclcpp/duration.hpp b/rclcpp/include/rclcpp/duration.hpp
index 6e63584..11fc2e2 100644
--- a/rclcpp/include/rclcpp/duration.hpp
+++ b/rclcpp/include/rclcpp/duration.hpp
@@ -97,6 +97,13 @@ public:
   rcl_duration_value_t
   nanoseconds() const;
 
+  /// \return the duration in seconds as a floating point number.
+  /// \warning Depending on sizeof(double) there could be significant precision loss.
+  /// When an exact time is required use nanoseconds() instead.
+  RCLCPP_PUBLIC
+  double
+  seconds() const;
+
 private:
   rcl_duration_t rcl_duration_;
 };
diff --git a/rclcpp/src/rclcpp/duration.cpp b/rclcpp/src/rclcpp/duration.cpp
index afbc293..0455abe 100644
--- a/rclcpp/src/rclcpp/duration.cpp
+++ b/rclcpp/src/rclcpp/duration.cpp
@@ -214,4 +214,10 @@ Duration::nanoseconds() const
   return rcl_duration_.nanoseconds;
 }
 
+double
+Duration::seconds() const
+{
+  return std::chrono::duration<double>(std::chrono::nanoseconds(rcl_duration_.nanoseconds)).count();
+}
+
 }  // namespace rclcpp