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73 changes: 73 additions & 0 deletions
73
externals/coda-oss/modules/c++/coda_oss/include/coda_oss/mdspan.h
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| /* ========================================================================= | ||
| * This file is part of coda_oss-c++ | ||
| * ========================================================================= | ||
| * | ||
| * (C) Copyright 2004 - 2014, MDA Information Systems LLC | ||
| * © Copyright 2023, Maxar Technologies, Inc. | ||
| * | ||
| * coda_oss-c++ is free software; you can redistribute it and/or modify | ||
| * it under the terms of the GNU Lesser General Public License as published by | ||
| * the Free Software Foundation; either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU Lesser General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Lesser General Public | ||
| * License along with this program; If not, | ||
| * see <http://www.gnu.org/licenses/>. | ||
| * | ||
| */ | ||
| #pragma once | ||
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| #include "coda_oss/CPlusPlus.h" | ||
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| // This should always work ... it's in a `details` namespace | ||
| #include "coda_oss/mdspan_.h" | ||
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| // This logic needs to be here rather than <std/mdspan> so that `coda_oss::mdspan` will | ||
| // be the same as `std::mdspan`. | ||
| #ifndef CODA_OSS_HAVE_std_mdspan_ | ||
| #define CODA_OSS_HAVE_std_mdspan_ 0 // assume no <mdspan> | ||
| #endif | ||
| #ifndef CODA_OSS_HAVE_experimental_mdspan_ | ||
| #define CODA_OSS_HAVE_experimental_mdspan_ 0 // assume no std::experimental::mdspan | ||
| #endif | ||
| #if CODA_OSS_cpp17 // __has_include | ||
| #if __has_include(<mdspan>) // <mdspan> not until C++23 | ||
| #include <mdspan> | ||
| #undef CODA_OSS_HAVE_std_mdspan_ | ||
| #define CODA_OSS_HAVE_std_mdspan_ 1 // provided by the implementation, probably C++23 | ||
| #endif | ||
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| #if CODA_OSS_cpp20 // Can't even #include this file with older C++14/17 compilers! :-( | ||
| // Put this in a __has_include so that it's optional. Our simple implemtnation works | ||
| // for our needs, and this brings along a lot of code that our older compilers don't | ||
| // like. By the time we need more functionality, maybe we'll be using C++23? | ||
| // | ||
| // Until then, having this available allows checking our implementation against | ||
| // something much more real. https://github.com/kokkos/mdspan | ||
| #if __has_include("coda_oss/experimental/mdspan") | ||
| #include "coda_oss/experimental/mdspan" | ||
| #undef CODA_OSS_HAVE_experimental_mdspan_ | ||
| #define CODA_OSS_HAVE_experimental_mdspan_ 1 // provided coda_oss/experimental/mdspan | ||
| #endif | ||
| #endif | ||
| #endif // CODA_OSS_cpp17 | ||
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| namespace coda_oss | ||
| { | ||
| #if CODA_OSS_HAVE_std_mdspan_ | ||
| using std::mdspan; | ||
| using std::dextents; | ||
| #elif CODA_OSS_HAVE_experimental_mdspan_ | ||
| using std::experimental::mdspan; | ||
| using std::experimental::dextents; | ||
| #else | ||
| using details::mdspan; | ||
| using details::dextents; | ||
| #endif | ||
| } | ||
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151 changes: 151 additions & 0 deletions
151
externals/coda-oss/modules/c++/coda_oss/include/coda_oss/mdspan_.h
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| /* ========================================================================= | ||
| * This file is part of coda_oss-c++ | ||
| * ========================================================================= | ||
| * | ||
| * (C) Copyright 2004 - 2014, MDA Information Systems LLC | ||
| * © Copyright 2023, Maxar Technologies, Inc. | ||
| * | ||
| * coda_oss-c++ is free software; you can redistribute it and/or modify | ||
| * it under the terms of the GNU Lesser General Public License as published by | ||
| * the Free Software Foundation; either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU Lesser General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Lesser General Public | ||
| * License along with this program; If not, | ||
| * see <http://www.gnu.org/licenses/>. | ||
| * | ||
| */ | ||
| #pragma once | ||
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| #include <assert.h> | ||
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| #include <array> | ||
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| #include "coda_oss/span.h" | ||
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| // This is a simple, partial, and incomplete implementation of `std::mdspan` (in C++23). | ||
| // https://en.cppreference.com/w/cpp/container/mdspan | ||
| // | ||
| // Why? Our (current) needs are much more limited than all the use-cases for `std::mdspan`: | ||
| // dynamic (not static) extents, rank of 2 (rows × cols), contiguous memory, ... | ||
| // By the time we really need more features, maybe we'll be using C++23? | ||
| namespace coda_oss | ||
| { | ||
| namespace details | ||
| { | ||
| // https://en.cppreference.com/w/cpp/container/mdspan/extents | ||
| template<typename IndexType, size_t Rank> | ||
| struct dextents final // this is actually supposed to be an alias template with all dynamic extents | ||
| { | ||
| static_assert(Rank == 2, "Rank must have a value of 2"); | ||
| using index_type = IndexType; | ||
| using size_type = index_type; | ||
| using rank_type = size_t; | ||
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| constexpr dextents() = default; | ||
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| // These are supposed to be templates, but we don't need that complication right now. | ||
| constexpr dextents(index_type i0, index_type i1) noexcept : exts_{i0, i1} | ||
| { | ||
| } | ||
| constexpr explicit dextents(const std::array<index_type, Rank>& exts) noexcept : exts_(exts) | ||
| { | ||
| } | ||
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| dextents(const dextents&) = default; | ||
| dextents& operator=(const dextents&) = default; | ||
| dextents(dextents&&) = default; | ||
| dextents& operator=(dextents&&) = default; | ||
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| constexpr index_type extent(rank_type r) const noexcept | ||
| { | ||
| return exts_[r]; | ||
| } | ||
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| static constexpr auto rank() noexcept | ||
| { | ||
| return Rank; | ||
| } | ||
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| private: | ||
| std::array<index_type, Rank> exts_; | ||
| }; | ||
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| template<typename T, typename TExtents> | ||
| class mdspan final | ||
| { | ||
| coda_oss::span<T> s_; // `span` instead of a raw pointer to get more range checking. | ||
| TExtents ext_; | ||
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| // c.f., `types::RowCol` | ||
| template <typename IndexType, size_t Rank> | ||
| static size_t area(const dextents<IndexType, Rank>& exts) | ||
| { | ||
| return exts.extent(0) * exts.extent(1); | ||
| } | ||
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| public: | ||
| using extents_type = TExtents; | ||
| using size_type = typename extents_type::size_type; | ||
| using data_handle_type = T*; | ||
| using reference = T&; | ||
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| constexpr mdspan() = default; | ||
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| // Again, these are supposed to be templates ... | ||
| mdspan(data_handle_type p, const extents_type& ext) noexcept : s_(p, area(ext)), ext_(ext) | ||
| { | ||
| } | ||
| mdspan(data_handle_type p, const std::array<size_type, 2>& dims) noexcept : mdspan(p, extents_type(dims)) | ||
| { | ||
| } | ||
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| mdspan(const mdspan&) = default; | ||
| mdspan& operator=(const mdspan&) = default; | ||
| mdspan(mdspan&&) = default; | ||
| mdspan& operator=(mdspan&&) = default; | ||
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| constexpr data_handle_type data_handle() const noexcept | ||
| { | ||
| return s_.data(); | ||
| } | ||
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| /*constexpr*/ reference operator[](size_t idx) const noexcept | ||
| { | ||
| assert(idx < size()); // prevents "constexpr" in C++11 | ||
| return data_handle()[idx]; | ||
| } | ||
| /*constexpr*/ reference operator()(size_t r, size_t c) const noexcept | ||
| { | ||
| const auto offset = (r * extent(1)) + c; | ||
| return (*this)[offset]; | ||
| } | ||
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| constexpr size_t size() const noexcept | ||
| { | ||
| return s_.size(); | ||
| } | ||
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| constexpr bool empty() const noexcept | ||
| { | ||
| return s_.empty(); | ||
| } | ||
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| auto extent(size_type rank) const | ||
| { | ||
| return ext_.extent(rank); | ||
| } | ||
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| static constexpr auto rank() noexcept | ||
| { | ||
| return extents_type::rank(); | ||
| } | ||
| }; | ||
| } | ||
| } | ||
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