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//===----------------------- 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;
};
} // end namespace __orc_rt
#endif // ORC_RT_ADT_H
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