From f9c1a40e21bff9739c9910436d59b25a69538cdf Mon Sep 17 00:00:00 2001
From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Date: Thu, 2 Sep 2021 04:02:43 +0300
Subject: libcamera: base: utils: Use size_t for index in utils::enumerate()

The index generated by utils::enumerate() is an iteration counter, which
should thus be positive. Use std::size_t instead of the difference_type
of the container.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
---
 include/libcamera/base/utils.h |  4 ++--
 test/utils.cpp                 | 10 +++++-----
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/include/libcamera/base/utils.h b/include/libcamera/base/utils.h
index 52301254..2b761436 100644
--- a/include/libcamera/base/utils.h
+++ b/include/libcamera/base/utils.h
@@ -246,7 +246,7 @@ private:
 
 public:
 	using difference_type = typename std::iterator_traits<Base>::difference_type;
-	using value_type = std::pair<const difference_type, base_reference>;
+	using value_type = std::pair<const std::size_t, base_reference>;
 	using pointer = value_type *;
 	using reference = value_type &;
 	using iterator_category = std::input_iterator_tag;
@@ -275,7 +275,7 @@ public:
 
 private:
 	Base current_;
-	difference_type pos_;
+	std::size_t pos_;
 };
 
 template<typename Base>
diff --git a/test/utils.cpp b/test/utils.cpp
index d7f810e9..d65467b5 100644
--- a/test/utils.cpp
+++ b/test/utils.cpp
@@ -77,8 +77,8 @@ protected:
 
 	int testEnumerate()
 	{
-		std::vector<int> integers{ 1, 2, 3, 4, 5 };
-		int i = 0;
+		std::vector<unsigned int> integers{ 1, 2, 3, 4, 5 };
+		unsigned int i = 0;
 
 		for (auto [index, value] : utils::enumerate(integers)) {
 			if (index != i || value != i + 1) {
@@ -93,12 +93,12 @@ protected:
 			++i;
 		}
 
-		if (integers != std::vector<int>{ 0, 1, 2, 3, 4 }) {
+		if (integers != std::vector<unsigned int>{ 0, 1, 2, 3, 4 }) {
 			cerr << "Failed to modify container in enumerated range loop" << endl;
 			return TestFail;
 		}
 
-		Span<const int> span{ integers };
+		Span<const unsigned int> span{ integers };
 		i = 0;
 
 		for (auto [index, value] : utils::enumerate(span)) {
@@ -112,7 +112,7 @@ protected:
 			++i;
 		}
 
-		const int array[] = { 0, 2, 4, 6, 8 };
+		const unsigned int array[] = { 0, 2, 4, 6, 8 };
 		i = 0;
 
 		for (auto [index, value] : utils::enumerate(array)) {
-- 
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