1//===-------- stl_extras.h - Useful STL related functions-------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file is a part of the ORC runtime support library.
10//
11//===----------------------------------------------------------------------===//
12
13#ifndef ORC_RT_STL_EXTRAS_H
14#define ORC_RT_STL_EXTRAS_H
15
16#include <cstdint>
17#include <utility>
18#include <tuple>
19
20namespace orc_rt {
21
22/// Substitute for std::identity.
23/// Switch to std::identity once we can use c++20.
24template <class Ty> struct identity {
25 using is_transparent = void;
26 using argument_type = Ty;
27
28 Ty &operator()(Ty &self) const { return self; }
29 const Ty &operator()(const Ty &self) const { return self; }
30};
31
32/// Substitute for std::bit_ceil.
33constexpr uint64_t bit_ceil(uint64_t Val) noexcept {
34 Val |= (Val >> 1);
35 Val |= (Val >> 2);
36 Val |= (Val >> 4);
37 Val |= (Val >> 8);
38 Val |= (Val >> 16);
39 Val |= (Val >> 32);
40 return Val + 1;
41}
42
43} // namespace orc_rt
44
45#endif // ORC_RT_STL_EXTRAS
46