forked from OSchip/llvm-project
114 lines
3.5 KiB
C++
114 lines
3.5 KiB
C++
//===----------------------- 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 <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;
|
|
};
|
|
|
|
/// A substitue for std::string_view (and llvm::StringRef).
|
|
/// FIXME: Remove in favor of std::string_view once we have c++17.
|
|
class string_view {
|
|
public:
|
|
typedef char value_type;
|
|
typedef char *pointer;
|
|
typedef const char *const_pointer;
|
|
typedef char &reference;
|
|
typedef const char &const_reference;
|
|
typedef std::size_t size_type;
|
|
typedef std::ptrdiff_t difference_type;
|
|
|
|
typedef const_pointer const_iterator;
|
|
typedef const_iterator iterator;
|
|
|
|
constexpr string_view() noexcept = default;
|
|
constexpr string_view(const char *S, size_type Count)
|
|
: Data(S), Size(Count) {}
|
|
string_view(const char *S) : Data(S), Size(strlen(S)) {}
|
|
|
|
constexpr const_iterator begin() const noexcept { return Data; }
|
|
constexpr const_iterator end() const noexcept { return Data + Size; }
|
|
constexpr const_pointer data() const noexcept { return Data; }
|
|
constexpr const_reference operator[](size_type idx) { return Data[idx]; }
|
|
constexpr size_type size() const noexcept { return Size; }
|
|
constexpr bool empty() const noexcept { return Size == 0; }
|
|
|
|
friend bool operator==(const string_view &LHS, const string_view &RHS) {
|
|
if (LHS.Size != RHS.Size)
|
|
return false;
|
|
if (LHS.Data == RHS.Data)
|
|
return true;
|
|
for (size_t I = 0; I != LHS.Size; ++I)
|
|
if (LHS.Data[I] != RHS.Data[I])
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
friend bool operator!=(const string_view &LHS, const string_view &RHS) {
|
|
return !(LHS == RHS);
|
|
}
|
|
|
|
private:
|
|
const char *Data = nullptr;
|
|
size_type Size = 0;
|
|
};
|
|
|
|
inline std::string to_string(string_view SV) {
|
|
return std::string(SV.data(), SV.size());
|
|
}
|
|
|
|
} // end namespace __orc_rt
|
|
|
|
#endif // ORC_RT_COMMON_H
|