[rtsan] Remove mkfifoat interceptor (#116997)
[llvm-project.git] / libcxx / include / __ranges / range_adaptor.h
blobd944a83406ba7f2295e4c88cf31bde40d5b03038
1 // -*- C++ -*-
2 //===----------------------------------------------------------------------===//
3 //
4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5 // See https://llvm.org/LICENSE.txt for license information.
6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //
8 //===----------------------------------------------------------------------===//
10 #ifndef _LIBCPP___RANGES_RANGE_ADAPTOR_H
11 #define _LIBCPP___RANGES_RANGE_ADAPTOR_H
13 #include <__concepts/constructible.h>
14 #include <__concepts/derived_from.h>
15 #include <__concepts/invocable.h>
16 #include <__concepts/same_as.h>
17 #include <__config>
18 #include <__functional/compose.h>
19 #include <__functional/invoke.h>
20 #include <__ranges/concepts.h>
21 #include <__type_traits/decay.h>
22 #include <__type_traits/invoke.h>
23 #include <__type_traits/is_class.h>
24 #include <__type_traits/is_nothrow_constructible.h>
25 #include <__type_traits/remove_cv.h>
26 #include <__type_traits/remove_cvref.h>
27 #include <__utility/forward.h>
28 #include <__utility/move.h>
30 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
31 # pragma GCC system_header
32 #endif
34 _LIBCPP_PUSH_MACROS
35 #include <__undef_macros>
37 _LIBCPP_BEGIN_NAMESPACE_STD
39 #if _LIBCPP_STD_VER >= 20
41 namespace ranges {
43 // CRTP base that one can derive from in order to be considered a range adaptor closure
44 // by the library. When deriving from this class, a pipe operator will be provided to
45 // make the following hold:
46 // - `x | f` is equivalent to `f(x)`
47 // - `f1 | f2` is an adaptor closure `g` such that `g(x)` is equivalent to `f2(f1(x))`
48 template <class _Tp>
49 requires is_class_v<_Tp> && same_as<_Tp, remove_cv_t<_Tp>>
50 struct __range_adaptor_closure {};
52 // Type that wraps an arbitrary function object and makes it into a range adaptor closure,
53 // i.e. something that can be called via the `x | f` notation.
54 template <class _Fn>
55 struct __pipeable : _Fn, __range_adaptor_closure<__pipeable<_Fn>> {
56 _LIBCPP_HIDE_FROM_ABI constexpr explicit __pipeable(_Fn&& __f) : _Fn(std::move(__f)) {}
58 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(__pipeable);
60 template <class _Tp>
61 _Tp __derived_from_range_adaptor_closure(__range_adaptor_closure<_Tp>*);
63 template <class _Tp>
64 concept _RangeAdaptorClosure = !ranges::range<remove_cvref_t<_Tp>> && requires {
65 // Ensure that `remove_cvref_t<_Tp>` is derived from `__range_adaptor_closure<remove_cvref_t<_Tp>>` and isn't derived
66 // from `__range_adaptor_closure<U>` for any other type `U`.
67 { ranges::__derived_from_range_adaptor_closure((remove_cvref_t<_Tp>*)nullptr) } -> same_as<remove_cvref_t<_Tp>>;
70 template <ranges::range _Range, _RangeAdaptorClosure _Closure>
71 requires invocable<_Closure, _Range>
72 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr decltype(auto)
73 operator|(_Range&& __range, _Closure&& __closure) noexcept(is_nothrow_invocable_v<_Closure, _Range>) {
74 return std::invoke(std::forward<_Closure>(__closure), std::forward<_Range>(__range));
77 template <_RangeAdaptorClosure _Closure, _RangeAdaptorClosure _OtherClosure>
78 requires constructible_from<decay_t<_Closure>, _Closure> && constructible_from<decay_t<_OtherClosure>, _OtherClosure>
79 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator|(_Closure&& __c1, _OtherClosure&& __c2) noexcept(
80 is_nothrow_constructible_v<decay_t<_Closure>, _Closure> &&
81 is_nothrow_constructible_v<decay_t<_OtherClosure>, _OtherClosure>) {
82 return __pipeable(std::__compose(std::forward<_OtherClosure>(__c2), std::forward<_Closure>(__c1)));
85 # if _LIBCPP_STD_VER >= 23
86 template <class _Tp>
87 requires is_class_v<_Tp> && same_as<_Tp, remove_cv_t<_Tp>>
88 class range_adaptor_closure : public __range_adaptor_closure<_Tp> {};
89 # endif // _LIBCPP_STD_VER >= 23
91 } // namespace ranges
93 #endif // _LIBCPP_STD_VER >= 20
95 _LIBCPP_END_NAMESPACE_STD
97 _LIBCPP_POP_MACROS
99 #endif // _LIBCPP___RANGES_RANGE_ADAPTOR_H