1//===----------------------------------------------------------------------===//
 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#ifndef _LIBCPP___UTILITY_IS_VALID_RANGE_H
10#define _LIBCPP___UTILITY_IS_VALID_RANGE_H
11
12#include <__algorithm/comp.h>
13#include <__config>
14#include <__type_traits/is_constant_evaluated.h>
15
16#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
17#  pragma GCC system_header
18#endif
19
20_LIBCPP_BEGIN_NAMESPACE_STD
21
22template <class _Tp>
23_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI _LIBCPP_NO_SANITIZE("address") bool
24__is_valid_range(const _Tp* __first, const _Tp* __last) {
25  if (__libcpp_is_constant_evaluated()) {
26    // If this is not a constant during constant evaluation, that is because __first and __last are not
27    // part of the same allocation. If they are part of the same allocation, we must still make sure they
28    // are ordered properly.
29    return __builtin_constant_p(__first <= __last) && __first <= __last;
30  }
31
32  return !__less<>()(__last, __first);
33}
34
35_LIBCPP_END_NAMESPACE_STD
36
37#endif // _LIBCPP___UTILITY_IS_VALID_RANGE_H