| //===----------------------- adt.h - Handy ADTs -----------------*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file is a part of the ORC runtime support library. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef ORC_RT_ADT_H |
| #define ORC_RT_ADT_H |
| |
| #include <cstring> |
| #include <limits> |
| #include <ostream> |
| #include <string> |
| |
| namespace orc_rt { |
| |
| constexpr std::size_t dynamic_extent = std::numeric_limits<std::size_t>::max(); |
| |
| /// A substitute for std::span (and llvm::ArrayRef). |
| /// FIXME: Remove in favor of std::span once we can use c++20. |
| template <typename T, std::size_t Extent = dynamic_extent> class span { |
| public: |
| typedef T element_type; |
| typedef std::remove_cv<T> value_type; |
| typedef std::size_t size_type; |
| typedef std::ptrdiff_t difference_type; |
| typedef T *pointer; |
| typedef const T *const_pointer; |
| typedef T &reference; |
| typedef const T &const_reference; |
| |
| typedef pointer iterator; |
| |
| static constexpr std::size_t extent = Extent; |
| |
| constexpr span() noexcept = default; |
| constexpr span(T *first, size_type count) noexcept |
| : Data(first), Size(count) {} |
| |
| template <std::size_t N> |
| constexpr span(T (&arr)[N]) noexcept : Data(&arr[0]), Size(N) {} |
| |
| constexpr iterator begin() const noexcept { return Data; } |
| constexpr iterator end() const noexcept { return Data + Size; } |
| constexpr pointer data() const noexcept { return Data; } |
| constexpr reference operator[](size_type idx) const { return Data[idx]; } |
| constexpr size_type size() const noexcept { return Size; } |
| constexpr bool empty() const noexcept { return Size == 0; } |
| |
| private: |
| T *Data = nullptr; |
| size_type Size = 0; |
| }; |
| |
| } // namespace orc_rt |
| |
| #endif // ORC_RT_ADT_H |