libcamera: Replace ARRAY_SIZE() with std::size()

C++17 has a std::size() function that returns the size of a C-style
array. Use it instead of the custom ARRAY_SIZE macro.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Umang Jain <email@uajain.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>

include/libcamera/internal/utils.h

@@ -17,8 +17,6 @@
 #include <sys/time.h>
 #include <vector>
 
-#define ARRAY_SIZE(a)	(sizeof(a) / sizeof(a[0]))
-
 #ifndef __DOXYGEN__
 
 /* uClibc and uClibc-ng don't provide O_TMPFILE */

src/ipa/raspberrypi/raspberrypi.cpp

@@ -6,6 +6,7 @@
  */
 
 #include <algorithm>
+#include <array>
 #include <fcntl.h>
 #include <math.h>
 #include <stdint.h>
@@ -27,7 +28,6 @@
 #include "libcamera/internal/buffer.h"
 #include "libcamera/internal/camera_sensor.h"
 #include "libcamera/internal/log.h"
-#include "libcamera/internal/utils.h"
 
 #include <linux/bcm2835-isp.h>
 
@@ -1092,7 +1092,7 @@ void IPARPi::applyLS(const struct AlscStatus *lsStatus, ControlList &ctrls)
 	 * Choose smallest cell size that won't exceed 63x48 cells.
 	 */
 	const int cellSizes[] = { 16, 32, 64, 128, 256 };
-	unsigned int numCells = ARRAY_SIZE(cellSizes);
+	unsigned int numCells = std::size(cellSizes);
 	unsigned int i, w, h, cellSize;
 	for (i = 0; i < numCells; i++) {
 		cellSize = cellSizes[i];

src/libcamera/camera.cpp

@@ -7,6 +7,7 @@
 
 #include <libcamera/camera.h>
 
+#include <array>
 #include <atomic>
 #include <iomanip>
 
@@ -17,7 +18,6 @@
 #include "libcamera/internal/log.h"
 #include "libcamera/internal/pipeline_handler.h"
 #include "libcamera/internal/thread.h"
-#include "libcamera/internal/utils.h"
 
 /**
  * \file camera.h
@@ -393,7 +393,7 @@ int Camera::Private::isAccessAllowed(State state, bool allowDisconnected) const
 	if (currentState == state)
 		return 0;
 
-	ASSERT(static_cast<unsigned int>(state) < ARRAY_SIZE(camera_state_names));
+	ASSERT(static_cast<unsigned int>(state) < std::size(camera_state_names));
 
 	LOG(Camera, Debug) << "Camera in " << camera_state_names[currentState]
 			   << " state trying operation requiring state "
@@ -412,8 +412,8 @@ int Camera::Private::isAccessAllowed(State low, State high,
 	if (currentState >= low && currentState <= high)
 		return 0;
 
-	ASSERT(static_cast<unsigned int>(low) < ARRAY_SIZE(camera_state_names) &&
-	       static_cast<unsigned int>(high) < ARRAY_SIZE(camera_state_names));
+	ASSERT(static_cast<unsigned int>(low) < std::size(camera_state_names) &&
+	       static_cast<unsigned int>(high) < std::size(camera_state_names));
 
 	LOG(Camera, Debug) << "Camera in " << camera_state_names[currentState]
 			   << " state trying operation requiring state between "

src/libcamera/log.cpp

@@ -7,6 +7,7 @@
 
 #include "libcamera/internal/log.h"
 
+#include <array>
 #if HAVE_BACKTRACE
 #include <execinfo.h>
 #endif
@@ -91,7 +92,7 @@ static const char *log_severity_name(LogSeverity severity)
 		"FATAL",
 	};
 
-	if (static_cast<unsigned int>(severity) < ARRAY_SIZE(names))
+	if (static_cast<unsigned int>(severity) < std::size(names))
 		return names[severity];
 	else
 		return "UNKWN";
@@ -406,7 +407,7 @@ void Logger::backtrace()
 		return;
 
 	void *buffer[32];
-	int num_entries = ::backtrace(buffer, ARRAY_SIZE(buffer));
+	int num_entries = ::backtrace(buffer, std::size(buffer));
 	char **strings = backtrace_symbols(buffer, num_entries);
 	if (!strings)
 		return;
@@ -620,7 +621,7 @@ LogSeverity Logger::parseLogLevel(const std::string &level)
 			severity = LogInvalid;
 	} else {
 		severity = LogInvalid;
-		for (unsigned int i = 0; i < ARRAY_SIZE(names); ++i) {
+		for (unsigned int i = 0; i < std::size(names); ++i) {
 			if (names[i] == level) {
 				severity = i;
 				break;

src/libcamera/utils.cpp

@@ -31,11 +31,6 @@ namespace libcamera {
 
 namespace utils {
 
-/**
- * \def ARRAY_SIZE(array)
- * \brief Determine the number of elements in the static array.
- */
-
 /**
  * \brief Strip the directory prefix from the path
  * \param[in] path The path to process

src/libcamera/v4l2_videodevice.cpp

@@ -7,6 +7,7 @@
 
 #include "libcamera/internal/v4l2_videodevice.h"
 
+#include <array>
 #include <fcntl.h>
 #include <iomanip>
 #include <sstream>
@@ -26,7 +27,6 @@
 #include "libcamera/internal/log.h"
 #include "libcamera/internal/media_device.h"
 #include "libcamera/internal/media_object.h"
-#include "libcamera/internal/utils.h"
 
 /**
  * \file v4l2_videodevice.h
@@ -860,7 +860,7 @@ int V4L2VideoDevice::trySetFormatMultiplane(V4L2DeviceFormat *format, bool set)
 	pix->num_planes = format->planesCount;
 	pix->field = V4L2_FIELD_NONE;
 
-	ASSERT(pix->num_planes <= ARRAY_SIZE(pix->plane_fmt));
+	ASSERT(pix->num_planes <= std::size(pix->plane_fmt));
 
 	for (unsigned int i = 0; i < pix->num_planes; ++i) {
 		pix->plane_fmt[i].bytesperline = format->planes[i].bpl;
@@ -1255,7 +1255,7 @@ std::unique_ptr<FrameBuffer> V4L2VideoDevice::createBuffer(unsigned int index)
 	buf.index = index;
 	buf.type = bufferType_;
 	buf.memory = V4L2_MEMORY_MMAP;
-	buf.length = ARRAY_SIZE(v4l2Planes);
+	buf.length = std::size(v4l2Planes);
 	buf.m.planes = v4l2Planes;
 
 	int ret = ioctl(VIDIOC_QUERYBUF, &buf);

test/ipc/unixsocket.cpp

@@ -6,6 +6,7 @@
  */
 
 #include <algorithm>
+#include <array>
 #include <fcntl.h>
 #include <iostream>
 #include <stdlib.h>
@@ -19,7 +20,6 @@
 #include "libcamera/internal/ipc_unixsocket.h"
 #include "libcamera/internal/thread.h"
 #include "libcamera/internal/timer.h"
-#include "libcamera/internal/utils.h"
 
 #include "test.h"
 
@@ -311,7 +311,7 @@ protected:
 		};
 		int fds[2];
 
-		for (unsigned int i = 0; i < ARRAY_SIZE(strings); i++) {
+		for (unsigned int i = 0; i < std::size(strings); i++) {
 			unsigned int len = strlen(strings[i]);
 
 			fds[i] = open("/tmp", O_TMPFILE | O_RDWR,
@@ -333,7 +333,7 @@ protected:
 		if (ret)
 			return ret;
 
-		for (unsigned int i = 0; i < ARRAY_SIZE(strings); i++) {
+		for (unsigned int i = 0; i < std::size(strings); i++) {
 			unsigned int len = strlen(strings[i]);
 			char buf[len];