From 90d2ef285802198d5b620ce5a9ab8de6e3c554bf Mon Sep 17 00:00:00 2001
From: Michael Ragazzon <michael.ragazzon@gmail.com>
Date: Mon, 25 Dec 2023 21:09:31 +0100
Subject: [PATCH] Introduce a basic implementation of a Span type

---
 CMake/FileList.cmake       |  1 +
 Include/RmlUi/Core/Span.h  | 71 ++++++++++++++++++++++++++++++++++++++
 Include/RmlUi/Core/Types.h |  1 +
 3 files changed, 73 insertions(+)
 create mode 100644 Include/RmlUi/Core/Span.h

diff --git a/CMake/FileList.cmake b/CMake/FileList.cmake
index 940cadd8b..5334c0d24 100644
--- a/CMake/FileList.cmake
+++ b/CMake/FileList.cmake
@@ -202,6 +202,7 @@ set(Core_PUB_HDR_FILES
     ${PROJECT_SOURCE_DIR}/Include/RmlUi/Core/RenderManager.h
     ${PROJECT_SOURCE_DIR}/Include/RmlUi/Core/ScriptInterface.h
     ${PROJECT_SOURCE_DIR}/Include/RmlUi/Core/ScrollTypes.h
+    ${PROJECT_SOURCE_DIR}/Include/RmlUi/Core/Span.h
     ${PROJECT_SOURCE_DIR}/Include/RmlUi/Core/Spritesheet.h
     ${PROJECT_SOURCE_DIR}/Include/RmlUi/Core/StableVector.h
     ${PROJECT_SOURCE_DIR}/Include/RmlUi/Core/Stream.h
diff --git a/Include/RmlUi/Core/Span.h b/Include/RmlUi/Core/Span.h
new file mode 100644
index 000000000..5fdfc61ce
--- /dev/null
+++ b/Include/RmlUi/Core/Span.h
@@ -0,0 +1,71 @@
+/*
+ * This source file is part of RmlUi, the HTML/CSS Interface Middleware
+ *
+ * For the latest information, see http://github.com/mikke89/RmlUi
+ *
+ * Copyright (c) 2008-2010 CodePoint Ltd, Shift Technology Ltd
+ * Copyright (c) 2019-2023 The RmlUi Team, and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ */
+
+#ifndef RMLUI_CORE_SPAN_H
+#define RMLUI_CORE_SPAN_H
+
+#include "../Config/Config.h"
+#include "Header.h"
+#include <stdint.h>
+#include <type_traits>
+
+namespace Rml {
+
+/**
+    Basic implementation of a span, which refers to a contiguous sequence of objects.
+ */
+
+template <typename T>
+class RMLUICORE_API Span {
+public:
+	Span() = default;
+	Span(T* data, size_t size) : m_data(data), m_size(size) { RMLUI_ASSERT(data != nullptr || size == 0); }
+
+	Span(const Vector<typename std::remove_const_t<T>>& container) : Span(container.data(), container.size()) {}
+	Span(Vector<T>& container) : Span(container.data(), container.size()) {}
+
+	T& operator[](size_t index) const
+	{
+		RMLUI_ASSERT(index < m_size);
+		return m_data[index];
+	}
+
+	T* data() const { return m_data; }
+	size_t size() const { return m_size; }
+	bool empty() const { return m_size == 0; }
+
+	T* begin() const { return m_data; }
+	T* end() const { return m_data + m_size; }
+
+private:
+	T* m_data = nullptr;
+	size_t m_size = 0;
+};
+
+} // namespace Rml
+#endif
diff --git a/Include/RmlUi/Core/Types.h b/Include/RmlUi/Core/Types.h
index 4074a4d8d..a45287910 100644
--- a/Include/RmlUi/Core/Types.h
+++ b/Include/RmlUi/Core/Types.h
@@ -51,6 +51,7 @@ enum class BoxArea { Margin, Border, Padding, Content, Auto };
 #include "Matrix4.h"
 #include "ObserverPtr.h"
 #include "Rectangle.h"
+#include "Span.h"
 #include "Vector2.h"
 #include "Vector3.h"
 #include "Vector4.h"