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101 lines
3.8 KiB
C++
101 lines
3.8 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___RANGES_RANGE_ADAPTOR_H
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#define _LIBCPP___RANGES_RANGE_ADAPTOR_H
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#include <__concepts/constructible.h>
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#include <__concepts/derived_from.h>
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#include <__concepts/invocable.h>
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#include <__concepts/same_as.h>
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#include <__config>
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#include <__functional/compose.h>
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#include <__functional/invoke.h>
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#include <__ranges/concepts.h>
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#include <__type_traits/decay.h>
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#include <__type_traits/is_class.h>
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#include <__type_traits/is_nothrow_constructible.h>
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#include <__type_traits/remove_cvref.h>
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#include <__utility/forward.h>
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#include <__utility/move.h>
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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_PUSH_MACROS
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#include <__undef_macros>
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER >= 20
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namespace ranges {
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// CRTP base that one can derive from in order to be considered a range adaptor closure
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// by the library. When deriving from this class, a pipe operator will be provided to
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// make the following hold:
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// - `x | f` is equivalent to `f(x)`
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// - `f1 | f2` is an adaptor closure `g` such that `g(x)` is equivalent to `f2(f1(x))`
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template <class _Tp>
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requires is_class_v<_Tp> && same_as<_Tp, remove_cv_t<_Tp>>
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struct __range_adaptor_closure;
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// Type that wraps an arbitrary function object and makes it into a range adaptor closure,
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// i.e. something that can be called via the `x | f` notation.
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template <class _Fn>
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struct __range_adaptor_closure_t : _Fn, __range_adaptor_closure<__range_adaptor_closure_t<_Fn>> {
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_LIBCPP_HIDE_FROM_ABI constexpr explicit __range_adaptor_closure_t(_Fn&& __f) : _Fn(std::move(__f)) {}
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};
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_LIBCPP_CTAD_SUPPORTED_FOR_TYPE(__range_adaptor_closure_t);
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template <class _Tp>
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_Tp __derived_from_range_adaptor_closure(__range_adaptor_closure<_Tp>*);
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template <class _Tp>
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concept _RangeAdaptorClosure = !ranges::range<remove_cvref_t<_Tp>> && requires {
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// Ensure that `remove_cvref_t<_Tp>` is derived from `__range_adaptor_closure<remove_cvref_t<_Tp>>` and isn't derived
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// from `__range_adaptor_closure<U>` for any other type `U`.
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{ ranges::__derived_from_range_adaptor_closure((remove_cvref_t<_Tp>*)nullptr) } -> same_as<remove_cvref_t<_Tp>>;
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};
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template <ranges::range _Range, _RangeAdaptorClosure _Closure>
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requires invocable<_Closure, _Range>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr decltype(auto)
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operator|(_Range&& __range, _Closure&& __closure) noexcept(is_nothrow_invocable_v<_Closure, _Range>) {
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return std::invoke(std::forward<_Closure>(__closure), std::forward<_Range>(__range));
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}
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template <_RangeAdaptorClosure _Closure, _RangeAdaptorClosure _OtherClosure>
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requires constructible_from<decay_t<_Closure>, _Closure> && constructible_from<decay_t<_OtherClosure>, _OtherClosure>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator|(_Closure&& __c1, _OtherClosure&& __c2) noexcept(
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is_nothrow_constructible_v<decay_t<_Closure>, _Closure> &&
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is_nothrow_constructible_v<decay_t<_OtherClosure>, _OtherClosure>) {
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return __range_adaptor_closure_t(std::__compose(std::forward<_OtherClosure>(__c2), std::forward<_Closure>(__c1)));
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}
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template <class _Tp>
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requires is_class_v<_Tp> && same_as<_Tp, remove_cv_t<_Tp>>
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struct __range_adaptor_closure {};
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# if _LIBCPP_STD_VER >= 23
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template <class _Tp>
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requires is_class_v<_Tp> && same_as<_Tp, remove_cv_t<_Tp>>
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class range_adaptor_closure : public __range_adaptor_closure<_Tp> {};
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# endif // _LIBCPP_STD_VER >= 23
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} // namespace ranges
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#endif // _LIBCPP_STD_VER >= 20
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___RANGES_RANGE_ADAPTOR_H
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