xref: /freebsd/contrib/llvm-project/libcxx/include/__algorithm/ranges_find.h (revision 370e009188ba90c3290b1479aa06ec98b66e140a)
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_H
10 #define _LIBCPP___ALGORITHM_RANGES_FIND_H
11 
12 #include <__algorithm/ranges_find_if.h>
13 #include <__config>
14 #include <__functional/identity.h>
15 #include <__functional/invoke.h>
16 #include <__functional/ranges_operations.h>
17 #include <__iterator/concepts.h>
18 #include <__iterator/projected.h>
19 #include <__ranges/access.h>
20 #include <__ranges/concepts.h>
21 #include <__ranges/dangling.h>
22 #include <__utility/forward.h>
23 #include <__utility/move.h>
24 
25 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
26 #  pragma GCC system_header
27 #endif
28 
29 #if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
30 
31 _LIBCPP_BEGIN_NAMESPACE_STD
32 
33 namespace ranges {
34 namespace __find {
35 struct __fn {
36   template <input_iterator _Ip, sentinel_for<_Ip> _Sp, class _Tp, class _Proj = identity>
37     requires indirect_binary_predicate<ranges::equal_to, projected<_Ip, _Proj>, const _Tp*>
38   _LIBCPP_HIDE_FROM_ABI constexpr
39   _Ip operator()(_Ip __first, _Sp __last, const _Tp& __value, _Proj __proj = {}) const {
40     auto __pred = [&](auto&& __e) { return std::forward<decltype(__e)>(__e) == __value; };
41     return ranges::__find_if_impl(std::move(__first), std::move(__last), __pred, __proj);
42   }
43 
44   template <input_range _Rp, class _Tp, class _Proj = identity>
45     requires indirect_binary_predicate<ranges::equal_to, projected<iterator_t<_Rp>, _Proj>, const _Tp*>
46   _LIBCPP_HIDE_FROM_ABI constexpr
47   borrowed_iterator_t<_Rp> operator()(_Rp&& __r, const _Tp& __value, _Proj __proj = {}) const {
48     auto __pred = [&](auto&& __e) { return std::forward<decltype(__e)>(__e) == __value; };
49     return ranges::__find_if_impl(ranges::begin(__r), ranges::end(__r), __pred, __proj);
50   }
51 };
52 } // namespace __find
53 
54 inline namespace __cpo {
55   inline constexpr auto find = __find::__fn{};
56 } // namespace __cpo
57 } // namespace ranges
58 
59 _LIBCPP_END_NAMESPACE_STD
60 
61 #endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
62 
63 #endif // _LIBCPP___ALGORITHM_RANGES_FIND_H
64