vendor/llvm-project/llvmorg-16-init-18548-gb0daacf58f41

1 files changed, 100 insertions, 0 deletions

diff --git a/libcxx/include/__iterator/iterator_with_data.h b/libcxx/include/__iterator/iterator_with_data.h
new file mode 100644
index 000000000000..06c2fa699c30
--- /dev/null
+++ b/libcxx/include/__iterator/iterator_with_data.h
@@ -0,0 +1,100 @@
+//===----------------------------------------------------------------------===//
+//
+// 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___ITERATOR_ITERATOR_WITH_DATA_H
+#define _LIBCPP___ITERATOR_ITERATOR_WITH_DATA_H
+
+#include <__compare/compare_three_way_result.h>
+#include <__compare/three_way_comparable.h>
+#include <__config>
+#include <__iterator/concepts.h>
+#include <__iterator/incrementable_traits.h>
+#include <__iterator/iter_move.h>
+#include <__iterator/iter_swap.h>
+#include <__iterator/iterator_traits.h>
+#include <__iterator/readable_traits.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
+
+template <forward_iterator _Iterator, class _Data>
+class __iterator_with_data {
+  _Iterator __iter_{};
+  _Data __data_{};
+
+public:
+  using value_type      = iter_value_t<_Iterator>;
+  using difference_type = iter_difference_t<_Iterator>;
+
+  _LIBCPP_HIDE_FROM_ABI __iterator_with_data() = default;
+
+  constexpr _LIBCPP_HIDE_FROM_ABI __iterator_with_data(_Iterator __iter, _Data __data)
+      : __iter_(std::move(__iter)), __data_(std::move(__data)) {}
+
+  constexpr _LIBCPP_HIDE_FROM_ABI _Iterator __get_iter() const { return __iter_; }
+
+  constexpr _LIBCPP_HIDE_FROM_ABI _Data __get_data() && { return std::move(__data_); }
+
+  friend constexpr _LIBCPP_HIDE_FROM_ABI bool
+  operator==(const __iterator_with_data& __lhs, const __iterator_with_data& __rhs) {
+    return __lhs.__iter_ == __rhs.__iter_;
+  }
+
+  constexpr _LIBCPP_HIDE_FROM_ABI __iterator_with_data& operator++() {
+    ++__iter_;
+    return *this;
+  }
+
+  constexpr _LIBCPP_HIDE_FROM_ABI __iterator_with_data operator++(int) {
+    auto __tmp = *this;
+    __iter_++;
+    return __tmp;
+  }
+
+  constexpr _LIBCPP_HIDE_FROM_ABI __iterator_with_data& operator--()
+    requires bidirectional_iterator<_Iterator>
+  {
+    --__iter_;
+    return *this;
+  }
+
+  constexpr _LIBCPP_HIDE_FROM_ABI __iterator_with_data operator--(int)
+    requires bidirectional_iterator<_Iterator>
+  {
+    auto __tmp = *this;
+    --__iter_;
+    return __tmp;
+  }
+
+  constexpr _LIBCPP_HIDE_FROM_ABI iter_reference_t<_Iterator> operator*() const { return *__iter_; }
+
+  _LIBCPP_HIDE_FROM_ABI friend constexpr iter_rvalue_reference_t<_Iterator>
+  iter_move(const __iterator_with_data& __iter) noexcept(noexcept(ranges::iter_move(__iter.__iter_))) {
+    return ranges::iter_move(__iter.__iter_);
+  }
+
+  _LIBCPP_HIDE_FROM_ABI friend constexpr void
+  iter_swap(const __iterator_with_data& __lhs,
+            const __iterator_with_data& __rhs) noexcept(noexcept(ranges::iter_swap(__lhs.__iter_, __rhs.__iter_)))
+    requires indirectly_swappable<_Iterator>
+  {
+    return ranges::iter_swap(__lhs.__data_, __rhs.__iter_);
+  }
+};
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_STD_VER >= 20
+
+#endif // _LIBCPP___ITERATOR_ITERATOR_WITH_DATA_H