106c3fb27SDimitry Andric //===----------------------------------------------------------------------===// 206c3fb27SDimitry Andric // 306c3fb27SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 406c3fb27SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 506c3fb27SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 606c3fb27SDimitry Andric // 706c3fb27SDimitry Andric //===----------------------------------------------------------------------===// 806c3fb27SDimitry Andric 906c3fb27SDimitry Andric #ifndef _LIBCPP___UTILITY_IS_POINTER_IN_RANGE_H 1006c3fb27SDimitry Andric #define _LIBCPP___UTILITY_IS_POINTER_IN_RANGE_H 1106c3fb27SDimitry Andric 1206c3fb27SDimitry Andric #include <__algorithm/comp.h> 1306c3fb27SDimitry Andric #include <__assert> 1406c3fb27SDimitry Andric #include <__config> 1506c3fb27SDimitry Andric #include <__type_traits/enable_if.h> 1606c3fb27SDimitry Andric #include <__type_traits/integral_constant.h> 1706c3fb27SDimitry Andric #include <__type_traits/is_constant_evaluated.h> 1806c3fb27SDimitry Andric #include <__type_traits/void_t.h> 1906c3fb27SDimitry Andric #include <__utility/declval.h> 20*0fca6ea1SDimitry Andric #include <__utility/is_valid_range.h> 2106c3fb27SDimitry Andric 2206c3fb27SDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 2306c3fb27SDimitry Andric # pragma GCC system_header 2406c3fb27SDimitry Andric #endif 2506c3fb27SDimitry Andric 2606c3fb27SDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 2706c3fb27SDimitry Andric 2806c3fb27SDimitry Andric template <class _Tp, class _Up, class = void> 2906c3fb27SDimitry Andric struct __is_less_than_comparable : false_type {}; 3006c3fb27SDimitry Andric 3106c3fb27SDimitry Andric template <class _Tp, class _Up> 3206c3fb27SDimitry Andric struct __is_less_than_comparable<_Tp, _Up, __void_t<decltype(std::declval<_Tp>() < std::declval<_Up>())> > : true_type { 3306c3fb27SDimitry Andric }; 3406c3fb27SDimitry Andric 3506c3fb27SDimitry Andric template <class _Tp, class _Up, __enable_if_t<__is_less_than_comparable<const _Tp*, const _Up*>::value, int> = 0> 36*0fca6ea1SDimitry Andric _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI _LIBCPP_NO_SANITIZE("address") bool 37*0fca6ea1SDimitry Andric __is_pointer_in_range(const _Tp* __begin, const _Tp* __end, const _Up* __ptr) { 38*0fca6ea1SDimitry Andric _LIBCPP_ASSERT_VALID_INPUT_RANGE(std::__is_valid_range(__begin, __end), "[__begin, __end) is not a valid range"); 3906c3fb27SDimitry Andric 40*0fca6ea1SDimitry Andric if (__libcpp_is_constant_evaluated()) { 4106c3fb27SDimitry Andric // If this is not a constant during constant evaluation we know that __ptr is not part of the allocation where 4206c3fb27SDimitry Andric // [__begin, __end) is. 4306c3fb27SDimitry Andric if (!__builtin_constant_p(__begin <= __ptr && __ptr < __end)) 4406c3fb27SDimitry Andric return false; 4506c3fb27SDimitry Andric } 4606c3fb27SDimitry Andric 4706c3fb27SDimitry Andric return !__less<>()(__ptr, __begin) && __less<>()(__ptr, __end); 4806c3fb27SDimitry Andric } 4906c3fb27SDimitry Andric 5006c3fb27SDimitry Andric template <class _Tp, class _Up, __enable_if_t<!__is_less_than_comparable<const _Tp*, const _Up*>::value, int> = 0> 51*0fca6ea1SDimitry Andric _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI _LIBCPP_NO_SANITIZE("address") bool 52*0fca6ea1SDimitry Andric __is_pointer_in_range(const _Tp* __begin, const _Tp* __end, const _Up* __ptr) { 5306c3fb27SDimitry Andric if (__libcpp_is_constant_evaluated()) 5406c3fb27SDimitry Andric return false; 5506c3fb27SDimitry Andric 5606c3fb27SDimitry Andric return reinterpret_cast<const char*>(__begin) <= reinterpret_cast<const char*>(__ptr) && 5706c3fb27SDimitry Andric reinterpret_cast<const char*>(__ptr) < reinterpret_cast<const char*>(__end); 5806c3fb27SDimitry Andric } 5906c3fb27SDimitry Andric 6006c3fb27SDimitry Andric _LIBCPP_END_NAMESPACE_STD 6106c3fb27SDimitry Andric 6206c3fb27SDimitry Andric #endif // _LIBCPP___UTILITY_IS_POINTER_IN_RANGE_H 63