File: required_alignment.pass.cpp

package info (click to toggle)
llvm-toolchain-20 1%3A20.1.6-1~exp1
  • links: PTS, VCS
  • area: main
  • in suites: experimental
  • size: 2,111,304 kB
  • sloc: cpp: 7,438,677; ansic: 1,393,822; asm: 1,012,926; python: 241,650; f90: 86,635; objc: 75,479; lisp: 42,144; pascal: 17,286; sh: 10,027; ml: 5,082; perl: 4,730; awk: 3,523; makefile: 3,349; javascript: 2,251; xml: 892; fortran: 672
file content (40 lines) | stat: -rw-r--r-- 1,034 bytes parent folder | download | duplicates (5) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
 
//
// 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
//
//===----------------------------------------------------------------------===//

// UNSUPPORTED: c++03, c++11, c++14, c++17

// static constexpr size_t required_alignment;

#include <atomic>
#include <cassert>
#include <concepts>
#include <cstddef>

template <typename T>
constexpr void check_required_alignment() {
  std::same_as<const std::size_t> decltype(auto) required_alignment = std::atomic_ref<T>::required_alignment;
  assert(required_alignment >= alignof(T));
}

constexpr bool test() {
  check_required_alignment<int>();
  check_required_alignment<float>();
  check_required_alignment<int*>();
  struct Empty {};
  check_required_alignment<Empty>();
  struct Trivial {
    int a;
  };
  check_required_alignment<Trivial>();
  return true;
}

int main(int, char**) {
  test();
  static_assert(test());
  return 0;
}