From 6a50c960be774b44a32f566f1f485cf800cc0527 Mon Sep 17 00:00:00 2001
From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Date: Fri, 23 Feb 2024 16:55:15 +0200
Subject: libcamera: utils: Add to_underlying() helper function

C++23 has a std::to_underlying() helper function that converts an
enumeration value to its underlying type. Add a compatible
implementation to the libcamera::utils namespace.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Naushir Patuck <naush@raspberrypi.com>
---
 include/libcamera/base/utils.h | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'include')

diff --git a/include/libcamera/base/utils.h b/include/libcamera/base/utils.h
index 37d9af60..922e4dfa 100644
--- a/include/libcamera/base/utils.h
+++ b/include/libcamera/base/utils.h
@@ -369,6 +369,12 @@ decltype(auto) abs_diff(const T &a, const T &b)
 
 double strtod(const char *__restrict nptr, char **__restrict endptr);
 
+template<class Enum>
+constexpr std::underlying_type_t<Enum> to_underlying(Enum e) noexcept
+{
+	return static_cast<std::underlying_type_t<Enum>>(e);
+}
+
 } /* namespace utils */
 
 #ifndef __DOXYGEN__
-- 
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