| //===----------------------------------------------------------------------===// |
| // |
| // 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_RANGES_FIND_IF_H |
| #define _LIBCPP___ALGORITHM_RANGES_FIND_IF_H |
| |
| #include <__config> |
| #include <__functional/identity.h> |
| #include <__functional/invoke.h> |
| #include <__functional/ranges_operations.h> |
| #include <__iterator/concepts.h> |
| #include <__iterator/projected.h> |
| #include <__ranges/access.h> |
| #include <__ranges/concepts.h> |
| #include <__ranges/dangling.h> |
| #include <__utility/move.h> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| #if _LIBCPP_STD_VER >= 20 |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| namespace ranges { |
| |
| template <class _Ip, class _Sp, class _Pred, class _Proj> |
| _LIBCPP_HIDE_FROM_ABI constexpr |
| _Ip __find_if_impl(_Ip __first, _Sp __last, _Pred& __pred, _Proj& __proj) { |
| for (; __first != __last; ++__first) { |
| if (std::invoke(__pred, std::invoke(__proj, *__first))) |
| break; |
| } |
| return __first; |
| } |
| |
| namespace __find_if { |
| struct __fn { |
| |
| template <input_iterator _Ip, sentinel_for<_Ip> _Sp, class _Proj = identity, |
| indirect_unary_predicate<projected<_Ip, _Proj>> _Pred> |
| _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr |
| _Ip operator()(_Ip __first, _Sp __last, _Pred __pred, _Proj __proj = {}) const { |
| return ranges::__find_if_impl(std::move(__first), std::move(__last), __pred, __proj); |
| } |
| |
| template <input_range _Rp, class _Proj = identity, |
| indirect_unary_predicate<projected<iterator_t<_Rp>, _Proj>> _Pred> |
| _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr |
| borrowed_iterator_t<_Rp> operator()(_Rp&& __r, _Pred __pred, _Proj __proj = {}) const { |
| return ranges::__find_if_impl(ranges::begin(__r), ranges::end(__r), __pred, __proj); |
| } |
| }; |
| } // namespace __find_if |
| |
| inline namespace __cpo { |
| inline constexpr auto find_if = __find_if::__fn{}; |
| } // namespace __cpo |
| } // namespace ranges |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP_STD_VER >= 20 |
| |
| #endif // _LIBCPP___ALGORITHM_RANGES_FIND_IF_H |