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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-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #ifndef _LIBCPP___ALGORITHM_RANGES_FIND_IF_H |
| 10 | #define _LIBCPP___ALGORITHM_RANGES_FIND_IF_H |
| 11 | |
| 12 | #include <__config> |
| 13 | #include <__functional/identity.h> |
| 14 | #include <__functional/invoke.h> |
| 15 | #include <__functional/ranges_operations.h> |
| 16 | #include <__iterator/concepts.h> |
| 17 | #include <__iterator/projected.h> |
| 18 | #include <__ranges/access.h> |
| 19 | #include <__ranges/concepts.h> |
| 20 | #include <__ranges/dangling.h> |
| 21 | #include <__utility/move.h> |
| 22 | |
| 23 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 24 | # pragma GCC system_header |
| 25 | #endif |
| 26 | |
| 27 | _LIBCPP_PUSH_MACROS |
| 28 | #include <__undef_macros> |
| 29 | |
| 30 | #if _LIBCPP_STD_VER >= 20 |
| 31 | |
| 32 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 33 | |
| 34 | namespace ranges { |
| 35 | |
| 36 | template <class _Ip, class _Sp, class _Pred, class _Proj> |
| 37 | _LIBCPP_HIDE_FROM_ABI constexpr _Ip __find_if_impl(_Ip __first, _Sp __last, _Pred& __pred, _Proj& __proj) { |
| 38 | for (; __first != __last; ++__first) { |
| 39 | if (std::invoke(__pred, std::invoke(__proj, *__first))) |
| 40 | break; |
| 41 | } |
| 42 | return __first; |
| 43 | } |
| 44 | |
| 45 | struct __find_if { |
| 46 | template <input_iterator _Ip, |
| 47 | sentinel_for<_Ip> _Sp, |
| 48 | class _Proj = identity, |
| 49 | indirect_unary_predicate<projected<_Ip, _Proj>> _Pred> |
| 50 | [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr _Ip |
| 51 | operator()(_Ip __first, _Sp __last, _Pred __pred, _Proj __proj = {}) const { |
| 52 | return ranges::__find_if_impl(std::move(__first), std::move(__last), __pred, __proj); |
| 53 | } |
| 54 | |
| 55 | template <input_range _Rp, class _Proj = identity, indirect_unary_predicate<projected<iterator_t<_Rp>, _Proj>> _Pred> |
| 56 | [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_Rp> |
| 57 | operator()(_Rp&& __r, _Pred __pred, _Proj __proj = {}) const { |
| 58 | return ranges::__find_if_impl(ranges::begin(__r), ranges::end(__r), __pred, __proj); |
| 59 | } |
| 60 | }; |
| 61 | |
| 62 | inline namespace __cpo { |
| 63 | inline constexpr auto find_if = __find_if{}; |
| 64 | } // namespace __cpo |
| 65 | } // namespace ranges |
| 66 | |
| 67 | _LIBCPP_END_NAMESPACE_STD |
| 68 | |
| 69 | #endif // _LIBCPP_STD_VER >= 20 |
| 70 | |
| 71 | _LIBCPP_POP_MACROS |
| 72 | |
| 73 | #endif // _LIBCPP___ALGORITHM_RANGES_FIND_IF_H |
| 74 |
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