From e2d00fbcbb1a9b2da50fa2e280817a0de1a7d286 Mon Sep 17 00:00:00 2001
From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Date: Wed, 6 Apr 2022 18:12:54 +0300
Subject: libcamera: base: utils: Add missing constructor for Duration

The Duration class is missing the equivalent to the
std::chrono::duration constructor that takes a number of ticks expressed
as a scalar. Fix it, which allows initializing a Duration instance to 0
or 0.0.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
---
 include/libcamera/base/utils.h | 6 ++++++
 src/libcamera/base/utils.cpp   | 9 +++++++++
 2 files changed, 15 insertions(+)

diff --git a/include/libcamera/base/utils.h b/include/libcamera/base/utils.h
index 9ab18101..cfff0583 100644
--- a/include/libcamera/base/utils.h
+++ b/include/libcamera/base/utils.h
@@ -327,6 +327,12 @@ class Duration : public std::chrono::duration<double, std::nano>
 public:
 	Duration() = default;
 
+	template<typename Rep>
+	constexpr explicit Duration(const Rep &r)
+		: BaseDuration(r)
+	{
+	}
+
 	template<typename Rep, typename Period>
 	constexpr Duration(const std::chrono::duration<Rep, Period> &d)
 		: BaseDuration(d)
diff --git a/src/libcamera/base/utils.cpp b/src/libcamera/base/utils.cpp
index 8cf8a5b2..6a307940 100644
--- a/src/libcamera/base/utils.cpp
+++ b/src/libcamera/base/utils.cpp
@@ -406,6 +406,15 @@ std::string toAscii(const std::string &str)
  * duration in nanoseconds with double precision
  */
 
+/**
+ * \fn Duration::Duration(const Rep &r)
+ * \brief Construct a Duration with \a r ticks
+ * \param[in] r The number of ticks
+ *
+ * The constructed \a Duration object is internally represented in double
+ * precision with \a r nanoseconds ticks.
+ */
+
 /**
  * \fn Duration::Duration(const std::chrono::duration<Rep, Period> &d)
  * \brief Construct a Duration by converting an arbitrary std::chrono::duration
-- 
cgit v1.2.1