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___CXX03___UTILITY_IS_VALID_RANGE_H 10 #define _LIBCPP___CXX03___UTILITY_IS_VALID_RANGE_H 11 12 #include <__cxx03/__algorithm/comp.h> 13 #include <__cxx03/__config> 14 #include <__cxx03/__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 22 template <class _Tp> __is_valid_range(const _Tp * __first,const _Tp * __last)23_LIBCPP_HIDE_FROM_ABI _LIBCPP_NO_SANITIZE("address") bool __is_valid_range(const _Tp* __first, const _Tp* __last) { 24 if (__libcpp_is_constant_evaluated()) { 25 // If this is not a constant during constant evaluation, that is because __first and __last are not 26 // part of the same allocation. If they are part of the same allocation, we must still make sure they 27 // are ordered properly. 28 return __builtin_constant_p(__first <= __last) && __first <= __last; 29 } 30 31 return !__less<>()(__last, __first); 32 } 33 34 _LIBCPP_END_NAMESPACE_STD 35 36 #endif // _LIBCPP___CXX03___UTILITY_IS_VALID_RANGE_H 37