| // -*- C++ -*- |
| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___ALGORITHM_FIND_H |
| #define _LIBCPP___ALGORITHM_FIND_H |
| |
| #include <__algorithm/unwrap_iter.h> |
| #include <__config> |
| #include <__functional/identity.h> |
| #include <__functional/invoke.h> |
| #include <__string/constexpr_c_functions.h> |
| #include <__type_traits/is_same.h> |
| |
| #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS |
| # include <cwchar> |
| #endif |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| template <class _Iter, class _Sent, class _Tp, class _Proj> |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Iter |
| __find_impl(_Iter __first, _Sent __last, const _Tp& __value, _Proj& __proj) { |
| for (; __first != __last; ++__first) |
| if (std::__invoke(__proj, *__first) == __value) |
| break; |
| return __first; |
| } |
| |
| template <class _Tp, |
| class _Up, |
| class _Proj, |
| __enable_if_t<__is_identity<_Proj>::value && __libcpp_is_trivially_equality_comparable<_Tp, _Up>::value && |
| sizeof(_Tp) == 1, |
| int> = 0> |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Tp* |
| __find_impl(_Tp* __first, _Tp* __last, const _Up& __value, _Proj&) { |
| if (auto __ret = std::__constexpr_memchr(__first, __value, __last - __first)) |
| return __ret; |
| return __last; |
| } |
| |
| #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS |
| template <class _Tp, |
| class _Up, |
| class _Proj, |
| __enable_if_t<__is_identity<_Proj>::value && __libcpp_is_trivially_equality_comparable<_Tp, _Up>::value && |
| sizeof(_Tp) == sizeof(wchar_t) && _LIBCPP_ALIGNOF(_Tp) >= _LIBCPP_ALIGNOF(wchar_t), |
| int> = 0> |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Tp* |
| __find_impl(_Tp* __first, _Tp* __last, const _Up& __value, _Proj&) { |
| if (auto __ret = std::__constexpr_wmemchr(__first, __value, __last - __first)) |
| return __ret; |
| return __last; |
| } |
| #endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS |
| |
| template <class _InputIterator, class _Tp> |
| _LIBCPP_NODISCARD_EXT inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 _InputIterator |
| find(_InputIterator __first, _InputIterator __last, const _Tp& __value) { |
| __identity __proj; |
| return std::__rewrap_iter( |
| __first, std::__find_impl(std::__unwrap_iter(__first), std::__unwrap_iter(__last), __value, __proj)); |
| } |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___ALGORITHM_FIND_H |