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| Rev | Author | Line No. | Line |
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| 1 | pmbaty | 1 | /* |
| 2 | * This file is part of the DXX-Rebirth project <https://www.dxx-rebirth.com/>. |
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| 3 | * It is copyright by its individual contributors, as recorded in the |
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| 4 | * project's Git history. See COPYING.txt at the top level for license |
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| 5 | * terms and a link to the Git history. |
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| 6 | */ |
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| 7 | #pragma once |
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| 8 | |||
| 9 | #include <cstddef> |
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| 10 | |||
| 11 | /* Partial implementation of std::span (C++20) for pre-C++20 compilers. |
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| 12 | * As of this writing, there are no released compilers with C++20 |
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| 13 | * support, so this implementation is always used. |
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| 14 | * |
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| 15 | * This implementation covers only the minimal functionality used by |
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| 16 | * Rebirth. It is not intended as a drop-in replacement for arbitrary |
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| 17 | * use of std::span. |
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| 18 | */ |
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| 19 | |||
| 20 | template <typename T> |
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| 21 | class span |
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| 22 | { |
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| 23 | std::size_t extent; |
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| 24 | T *ptr; |
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| 25 | public: |
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| 26 | span(T *p, std::size_t l) : |
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| 27 | extent(l), ptr(p) |
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| 28 | { |
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| 29 | } |
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| 30 | T *begin() const |
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| 31 | { |
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| 32 | return ptr; |
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| 33 | } |
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| 34 | T *end() const |
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| 35 | { |
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| 36 | return ptr + extent; |
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| 37 | } |
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| 38 | std::size_t size() const |
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| 39 | { |
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| 40 | return extent; |
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| 41 | } |
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| 42 | T &operator[](std::size_t i) const |
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| 43 | { |
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| 44 | return *(ptr + i); |
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| 45 | } |
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| 46 | }; |