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+/*
+ * libfud
+ * Copyright 2024 Dominick Allen
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef FUD_SPAN_HPP
+#define FUD_SPAN_HPP
+
+#include <cstdlib>
+
+#include "fud_array.hpp"
+
+namespace fud {
+
+template <typename T, size_t Size>
+struct Span {
+ static_assert(Size > 0);
+ using ValueType = T;
+
+ static Span make(Array<T, Size>& array) {
+ Span<T, Size> output{};
+ output.m_data = array.data();
+ return output;
+ }
+
+ template <typename U>
+ static Span make(const Array<U, Size>& array) {
+ static_assert(std::convertible_to<U, T>);
+ Span<T, Size> output{};
+ output.m_data = array.data();
+ return output;
+ }
+
+ T* m_data;
+
+ [[nodiscard]] constexpr size_t size() const
+ {
+ return Size;
+ }
+
+ constexpr T& front()
+ {
+ return m_data[0];
+ }
+
+ constexpr const T& front() const
+ {
+ return m_data[0];
+ }
+
+ constexpr T& back()
+ {
+ return m_data[Size - 1];
+ }
+
+ constexpr const T& back() const
+ {
+ return m_data[Size - 1];
+ }
+
+ constexpr T* data() noexcept
+ {
+ return m_data;
+ }
+
+ constexpr const T* data() const noexcept
+ {
+ return m_data;
+ }
+
+ constexpr T* begin() noexcept
+ {
+ return m_data;
+ }
+
+ constexpr const T* begin() const noexcept
+ {
+ return m_data;
+ }
+
+ constexpr T* end() noexcept
+ {
+ return m_data + Size;
+ }
+
+ constexpr const T* end() const noexcept
+ {
+ return m_data + Size;
+ }
+
+ constexpr T& operator[](size_t index)
+ {
+ return m_data[index];
+ }
+
+ constexpr const T& operator[](size_t index) const
+ {
+ return m_data[index];
+ }
+
+ constexpr bool operator==(const Span<T, Size>&) const noexcept = default;
+
+ constexpr auto operator<=>(const Span<T, Size>& other) const noexcept = default;
+};
+
+} // namespace fud
+
+#endif