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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-exception6//7//===----------------------------------------------------------------------===//8 9#ifndef _LIBCPP___UTILITY_IS_POINTER_IN_RANGE_H10#define _LIBCPP___UTILITY_IS_POINTER_IN_RANGE_H11 12#include <__algorithm/comp.h>13#include <__assert>14#include <__config>15#include <__type_traits/enable_if.h>16#include <__type_traits/integral_constant.h>17#include <__type_traits/is_constant_evaluated.h>18#include <__type_traits/void_t.h>19#include <__utility/declval.h>20#include <__utility/is_valid_range.h>21 22#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)23# pragma GCC system_header24#endif25 26_LIBCPP_BEGIN_NAMESPACE_STD27 28template <class _Tp, class _Up, class = void>29struct __is_less_than_comparable : false_type {};30 31template <class _Tp, class _Up>32struct __is_less_than_comparable<_Tp, _Up, __void_t<decltype(std::declval<_Tp>() < std::declval<_Up>())> > : true_type {33};34 35template <class _Tp, class _Up, __enable_if_t<__is_less_than_comparable<const _Tp*, const _Up*>::value, int> = 0>36_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI _LIBCPP_NO_SANITIZE("address") bool37__is_pointer_in_range(const _Tp* __begin, const _Tp* __end, const _Up* __ptr) {38 _LIBCPP_ASSERT_VALID_INPUT_RANGE(std::__is_valid_range(__begin, __end), "[__begin, __end) is not a valid range");39 40 if (__libcpp_is_constant_evaluated()) {41 // If this is not a constant during constant evaluation we know that __ptr is not part of the allocation where42 // [__begin, __end) is.43 if (!__builtin_constant_p(__begin <= __ptr && __ptr < __end))44 return false;45 }46 47 return !__less<>()(__ptr, __begin) && __less<>()(__ptr, __end);48}49 50template <class _Tp, class _Up, __enable_if_t<!__is_less_than_comparable<const _Tp*, const _Up*>::value, int> = 0>51_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI _LIBCPP_NO_SANITIZE("address") bool52__is_pointer_in_range(const _Tp* __begin, const _Tp* __end, const _Up* __ptr) {53 if (__libcpp_is_constant_evaluated())54 return false;55 56 return reinterpret_cast<const char*>(__begin) <= reinterpret_cast<const char*>(__ptr) &&57 reinterpret_cast<const char*>(__ptr) < reinterpret_cast<const char*>(__end);58}59 60template <class _Tp, class _Up>61_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool62__is_overlapping_range(const _Tp* __begin, const _Tp* __end, const _Up* __begin2) {63 auto __size = __end - __begin;64 auto __end2 = __begin2 + __size;65 return std::__is_pointer_in_range(__begin, __end, __begin2) || std::__is_pointer_in_range(__begin2, __end2, __begin);66}67 68_LIBCPP_END_NAMESPACE_STD69 70#endif // _LIBCPP___UTILITY_IS_POINTER_IN_RANGE_H71