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+//
+// Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+// Official repository: https://github.com/boostorg/beast
+//
+
+#ifndef BOOST_BEAST_DETAIL_BUFFERS_RANGE_ADAPTOR_HPP
+#define BOOST_BEAST_DETAIL_BUFFERS_RANGE_ADAPTOR_HPP
+
+#include <boost/beast/core/buffer_traits.hpp>
+#include <iterator>
+#include <type_traits>
+
+namespace boost {
+namespace beast {
+namespace detail {
+
+template<class BufferSequence>
+class buffers_range_adaptor
+{
+ BufferSequence b_;
+
+public:
+#if BOOST_BEAST_DOXYGEN
+ using value_type = __see_below__;
+#else
+ using value_type = buffers_type<BufferSequence>;
+#endif
+
+ class const_iterator
+ {
+ friend class buffers_range_adaptor;
+
+ using iter_type =
+ buffers_iterator_type<BufferSequence>;
+
+ iter_type it_{};
+ buffers_range_adaptor const* b_ = nullptr;
+
+ const_iterator(
+ buffers_range_adaptor const& b,
+ iter_type const& it)
+ : it_(it)
+ , b_(&b)
+ {
+ }
+
+ public:
+ using value_type = typename
+ buffers_range_adaptor::value_type;
+ using pointer = value_type const*;
+ using reference = value_type;
+ using difference_type = std::ptrdiff_t;
+ using iterator_category =
+ std::bidirectional_iterator_tag;
+
+ const_iterator() = default;
+
+ bool
+ operator==(const_iterator const& other) const
+ {
+ return b_ == other.b_ && it_ == other.it_;
+ }
+
+ bool
+ operator!=(const_iterator const& other) const
+ {
+ return !(*this == other);
+ }
+
+ reference
+ operator*() const
+ {
+ return *it_;
+ }
+
+ pointer
+ operator->() const = delete;
+
+ const_iterator&
+ operator++()
+ {
+ ++it_;
+ return *this;
+ }
+
+ const_iterator
+ operator++(int)
+ {
+ auto temp = *this;
+ ++(*this);
+ return temp;
+ }
+
+ const_iterator&
+ operator--()
+ {
+ --it_;
+ return *this;
+ }
+
+ const_iterator
+ operator--(int)
+ {
+ auto temp = *this;
+ --(*this);
+ return temp;
+ }
+ };
+
+ buffers_range_adaptor(
+ buffers_range_adaptor const&) = default;
+ buffers_range_adaptor& operator=(
+ buffers_range_adaptor const&) = default;
+
+ explicit
+ buffers_range_adaptor(BufferSequence const& b)
+ : b_(b)
+ {
+ }
+
+ const_iterator
+ begin() const noexcept
+ {
+ return {*this, net::buffer_sequence_begin(b_)};
+ }
+
+ const_iterator
+ end() const noexcept
+ {
+ return {*this, net::buffer_sequence_end(b_)};
+ }
+};
+
+} // detail
+} // beast
+} // boost
+
+#endif