forked from OSchip/llvm-project
136 lines
4.2 KiB
C++
136 lines
4.2 KiB
C++
// -*- C++ -*-
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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___RANGES_COMMON_VIEW_H
|
|
#define _LIBCPP___RANGES_COMMON_VIEW_H
|
|
|
|
#include <__config>
|
|
#include <__iterator/common_iterator.h>
|
|
#include <__iterator/iterator_traits.h>
|
|
#include <__ranges/access.h>
|
|
#include <__ranges/all.h>
|
|
#include <__ranges/concepts.h>
|
|
#include <__ranges/enable_borrowed_range.h>
|
|
#include <__ranges/range_adaptor.h>
|
|
#include <__ranges/size.h>
|
|
#include <__ranges/view_interface.h>
|
|
#include <__utility/forward.h>
|
|
#include <__utility/move.h>
|
|
#include <concepts>
|
|
#include <type_traits>
|
|
|
|
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
|
|
#pragma GCC system_header
|
|
#endif
|
|
|
|
_LIBCPP_BEGIN_NAMESPACE_STD
|
|
|
|
#if !defined(_LIBCPP_HAS_NO_RANGES)
|
|
|
|
namespace ranges {
|
|
|
|
template<view _View>
|
|
requires (!common_range<_View> && copyable<iterator_t<_View>>)
|
|
class common_view : public view_interface<common_view<_View>> {
|
|
_View __base_ = _View();
|
|
|
|
public:
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
common_view() requires default_initializable<_View> = default;
|
|
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
constexpr explicit common_view(_View __v) : __base_(_VSTD::move(__v)) { }
|
|
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
constexpr _View base() const& requires copy_constructible<_View> { return __base_; }
|
|
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
constexpr _View base() && { return _VSTD::move(__base_); }
|
|
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
constexpr auto begin() {
|
|
if constexpr (random_access_range<_View> && sized_range<_View>)
|
|
return ranges::begin(__base_);
|
|
else
|
|
return common_iterator<iterator_t<_View>, sentinel_t<_View>>(ranges::begin(__base_));
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
constexpr auto begin() const requires range<const _View> {
|
|
if constexpr (random_access_range<const _View> && sized_range<const _View>)
|
|
return ranges::begin(__base_);
|
|
else
|
|
return common_iterator<iterator_t<const _View>, sentinel_t<const _View>>(ranges::begin(__base_));
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
constexpr auto end() {
|
|
if constexpr (random_access_range<_View> && sized_range<_View>)
|
|
return ranges::begin(__base_) + ranges::size(__base_);
|
|
else
|
|
return common_iterator<iterator_t<_View>, sentinel_t<_View>>(ranges::end(__base_));
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
constexpr auto end() const requires range<const _View> {
|
|
if constexpr (random_access_range<const _View> && sized_range<const _View>)
|
|
return ranges::begin(__base_) + ranges::size(__base_);
|
|
else
|
|
return common_iterator<iterator_t<const _View>, sentinel_t<const _View>>(ranges::end(__base_));
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
constexpr auto size() requires sized_range<_View> {
|
|
return ranges::size(__base_);
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI
|
|
constexpr auto size() const requires sized_range<const _View> {
|
|
return ranges::size(__base_);
|
|
}
|
|
};
|
|
|
|
template<class _Range>
|
|
common_view(_Range&&)
|
|
-> common_view<views::all_t<_Range>>;
|
|
|
|
template<class _View>
|
|
inline constexpr bool enable_borrowed_range<common_view<_View>> = enable_borrowed_range<_View>;
|
|
|
|
namespace views {
|
|
namespace __common {
|
|
struct __fn : __range_adaptor_closure<__fn> {
|
|
template<class _Range>
|
|
requires common_range<_Range>
|
|
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI
|
|
constexpr auto operator()(_Range&& __range) const
|
|
noexcept(noexcept(views::all(_VSTD::forward<_Range>(__range))))
|
|
-> decltype( views::all(_VSTD::forward<_Range>(__range)))
|
|
{ return views::all(_VSTD::forward<_Range>(__range)); }
|
|
|
|
template<class _Range>
|
|
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI
|
|
constexpr auto operator()(_Range&& __range) const
|
|
noexcept(noexcept(common_view{_VSTD::forward<_Range>(__range)}))
|
|
-> decltype( common_view{_VSTD::forward<_Range>(__range)})
|
|
{ return common_view{_VSTD::forward<_Range>(__range)}; }
|
|
};
|
|
}
|
|
|
|
inline namespace __cpo {
|
|
inline constexpr auto common = __common::__fn{};
|
|
}
|
|
} // namespace views
|
|
} // namespace ranges
|
|
|
|
#endif // !defined(_LIBCPP_HAS_NO_RANGES)
|
|
|
|
_LIBCPP_END_NAMESPACE_STD
|
|
|
|
#endif // _LIBCPP___RANGES_COMMON_VIEW_H
|