bb
157c6af18e
Avoid cases of filenames Update years in terms and other legal(ish) documents Don't update years in license headers, since change is not meaningful Will add linter rule in seperate commit Happy recompiling everyone! Original Patch By: Nescio Comment By: Gallaecio Differential Revision: D2620 This was SVN commit r27786.
90 lines
2.6 KiB
C++
90 lines
2.6 KiB
C++
/* Copyright (C) 2023 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef INCLUDED_PS_SPAN
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#define INCLUDED_PS_SPAN
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#include <cstddef>
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#include <iterator>
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#include <type_traits>
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namespace PS
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{
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/**
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* Simplifed version of std::span (C++20) as we don't support the original one
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* yet. The naming intentionally follows the STL version to make the future
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* replacement easier with less blame changing.
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* It supports only very basic subset of std::span functionality.
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* TODO: remove as soon as std::span become available.
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*/
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template<typename T>
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class span
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{
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public:
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using element_type = T;
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using value_type = std::remove_cv_t<T>;
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using size_type = size_t;
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using pointer = T*;
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using reference = T&;
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using iterator = pointer;
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constexpr span()
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: m_Pointer(nullptr), m_Extent(0) {}
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constexpr span(iterator first, size_type extent)
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: m_Pointer(first), m_Extent(extent) {}
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constexpr span(iterator first, iterator last)
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: m_Pointer(first), m_Extent(static_cast<size_type>(last - first)) {}
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template<typename OtherT, size_t N>
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constexpr span(const std::array<OtherT, N>& arr)
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: m_Pointer(arr.data()), m_Extent(arr.size()) {}
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template<typename ContinuousRange>
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constexpr span(ContinuousRange& range)
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: m_Pointer(range.data()), m_Extent(range.size()) {}
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constexpr span(const span& other) = default;
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constexpr span& operator=(const span& other) = default;
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~span() = default;
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constexpr size_type size() const { return m_Extent; }
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constexpr bool empty() const { return size() == 0; }
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constexpr reference operator[](size_type index) const { return *(m_Pointer + index); }
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constexpr pointer data() const { return m_Pointer; }
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constexpr iterator begin() const { return m_Pointer; }
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constexpr iterator end() const { return m_Pointer + m_Extent; }
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constexpr span subspan(size_type offset) const { return {m_Pointer + offset, m_Extent - offset}; }
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private:
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pointer m_Pointer;
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size_type m_Extent;
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};
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template<typename T, size_t N>
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span(const std::array<T, N>&) -> span<const T>;
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} // namespace PS
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#endif // INCLUDED_PS_SPAN
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