78 lines
2.7 KiB
C++
78 lines
2.7 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___ALGORITHM_FIND_H
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#define _LIBCPP___ALGORITHM_FIND_H
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#include <__algorithm/unwrap_iter.h>
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#include <__config>
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#include <__functional/identity.h>
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#include <__functional/invoke.h>
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#include <__string/constexpr_c_functions.h>
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#include <__type_traits/is_same.h>
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#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
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# include <cwchar>
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#endif
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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template <class _Iter, class _Sent, class _Tp, class _Proj>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Iter
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__find_impl(_Iter __first, _Sent __last, const _Tp& __value, _Proj& __proj) {
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for (; __first != __last; ++__first)
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if (std::__invoke(__proj, *__first) == __value)
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break;
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return __first;
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}
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template <class _Tp,
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class _Up,
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class _Proj,
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__enable_if_t<__is_identity<_Proj>::value && __libcpp_is_trivially_equality_comparable<_Tp, _Up>::value &&
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sizeof(_Tp) == 1,
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int> = 0>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Tp*
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__find_impl(_Tp* __first, _Tp* __last, const _Up& __value, _Proj&) {
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if (auto __ret = std::__constexpr_memchr(__first, __value, __last - __first))
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return __ret;
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return __last;
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}
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#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
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template <class _Tp,
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class _Up,
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class _Proj,
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__enable_if_t<__is_identity<_Proj>::value && __libcpp_is_trivially_equality_comparable<_Tp, _Up>::value &&
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sizeof(_Tp) == sizeof(wchar_t) && _LIBCPP_ALIGNOF(_Tp) >= _LIBCPP_ALIGNOF(wchar_t),
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int> = 0>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Tp*
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__find_impl(_Tp* __first, _Tp* __last, const _Up& __value, _Proj&) {
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if (auto __ret = std::__constexpr_wmemchr(__first, __value, __last - __first))
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return __ret;
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return __last;
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}
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#endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
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template <class _InputIterator, class _Tp>
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_LIBCPP_NODISCARD_EXT inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 _InputIterator
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find(_InputIterator __first, _InputIterator __last, const _Tp& __value) {
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__identity __proj;
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return std::__rewrap_iter(
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__first, std::__find_impl(std::__unwrap_iter(__first), std::__unwrap_iter(__last), __value, __proj));
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}
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___ALGORITHM_FIND_H
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