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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_HTTP_IMPL_FIELDS_HPP
 #define BOOST_BEAST_HTTP_IMPL_FIELDS_HPP
 
 #include <boost/beast/core/buffers_cat.hpp>
 #include <boost/beast/core/string.hpp>
 #include <boost/beast/core/detail/buffers_ref.hpp>
 #include <boost/beast/core/detail/clamp.hpp>
 #include <boost/beast/core/detail/static_string.hpp>
 #include <boost/beast/core/detail/temporary_buffer.hpp>
 #include <boost/beast/core/static_string.hpp>
 #include <boost/beast/http/verb.hpp>
 #include <boost/beast/http/rfc7230.hpp>
 #include <boost/beast/http/status.hpp>
 #include <boost/beast/http/chunk_encode.hpp>
 #include <boost/core/exchange.hpp>
 #include <boost/throw_exception.hpp>
 #include <stdexcept>
 #include <string>
 
 namespace boost {
 namespace beast {
 namespace http {
 
 template<class Allocator>
 class basic_fields<Allocator>::writer
 {
 public:
     using iter_type = typename list_t::const_iterator;
 
     struct field_iterator
     {
         iter_type it_;
 
         using value_type = net::const_buffer;
         using pointer = value_type const*;
         using reference = value_type const;
         using difference_type = std::ptrdiff_t;
         using iterator_category =
             std::bidirectional_iterator_tag;
 
         field_iterator() = default;
         field_iterator(field_iterator&& other) = default;
         field_iterator(field_iterator const& other) = default;
         field_iterator& operator=(field_iterator&& other) = default;
         field_iterator& operator=(field_iterator const& other) = default;
 
         explicit
         field_iterator(iter_type it)
             : it_(it)
         {
         }
 
         bool
         operator==(field_iterator const& other) const
         {
             return it_ == other.it_;
         }
 
         bool
         operator!=(field_iterator const& other) const
         {
             return !(*this == other);
         }
 
         reference
         operator*() const
         {
             return it_->buffer();
         }
 
         field_iterator&
         operator++()
         {
             ++it_;
             return *this;
         }
 
         field_iterator
         operator++(int)
         {
             auto temp = *this;
             ++(*this);
             return temp;
         }
 
         field_iterator&
         operator--()
         {
             --it_;
             return *this;
         }
 
         field_iterator
         operator--(int)
         {
             auto temp = *this;
             --(*this);
             return temp;
         }
     };
 
     class field_range
     {
         field_iterator first_;
         field_iterator last_;
 
     public:
         using const_iterator =
             field_iterator;
 
         using value_type =
             typename const_iterator::value_type;
 
         field_range(iter_type first, iter_type last)
             : first_(first)
             , last_(last)
         {
         }
 
         const_iterator
         begin() const
         {
             return first_;
         }
 
         const_iterator
         end() const
         {
             return last_;
         }
     };
 
     using view_type = buffers_cat_view<
         net::const_buffer,
         net::const_buffer,
         net::const_buffer,
         field_range,
         chunk_crlf>;
 
     basic_fields const& f_;
     boost::optional<view_type> view_;
     char buf_[13];
 
 public:
     using const_buffers_type =
         beast::detail::buffers_ref<view_type>;
 
     writer(basic_fields const& f,
         unsigned version, verb v);
 
     writer(basic_fields const& f,
         unsigned version, unsigned code);
 
     writer(basic_fields const& f);
 
     const_buffers_type
     get() const
     {
         return const_buffers_type(*view_);
     }
 };
 
 template<class Allocator>
 basic_fields<Allocator>::writer::
 writer(basic_fields const& f)
     : f_(f)
 {
     view_.emplace(
         net::const_buffer{nullptr, 0},
         net::const_buffer{nullptr, 0},
         net::const_buffer{nullptr, 0},
         field_range(f_.list_.begin(), f_.list_.end()),
         chunk_crlf());
 }
 
 template<class Allocator>
 basic_fields<Allocator>::writer::
 writer(basic_fields const& f,
         unsigned version, verb v)
     : f_(f)
 {
 /*
     request
         "<method>"
         " <target>"
         " HTTP/X.Y\r\n" (11 chars)
 */
     string_view sv;
     if(v == verb::unknown)
         sv = f_.get_method_impl();
     else
         sv = to_string(v);
 
     // target_or_reason_ has a leading SP
 
     buf_[0] = ' ';
     buf_[1] = 'H';
     buf_[2] = 'T';
     buf_[3] = 'T';
     buf_[4] = 'P';
     buf_[5] = '/';
     buf_[6] = '0' + static_cast<char>(version / 10);
     buf_[7] = '.';
     buf_[8] = '0' + static_cast<char>(version % 10);
     buf_[9] = '\r';
     buf_[10]= '\n';
 
     view_.emplace(
         net::const_buffer{sv.data(), sv.size()},
         net::const_buffer{
             f_.target_or_reason_.data(),
             f_.target_or_reason_.size()},
         net::const_buffer{buf_, 11},
         field_range(f_.list_.begin(), f_.list_.end()),
         chunk_crlf());
 }
 
 template<class Allocator>
 basic_fields<Allocator>::writer::
 writer(basic_fields const& f,
         unsigned version, unsigned code)
     : f_(f)
 {
 /*
     response
         "HTTP/X.Y ### " (13 chars)
         "<reason>"
         "\r\n"
 */
     buf_[0] = 'H';
     buf_[1] = 'T';
     buf_[2] = 'T';
     buf_[3] = 'P';
     buf_[4] = '/';
     buf_[5] = '0' + static_cast<char>(version / 10);
     buf_[6] = '.';
     buf_[7] = '0' + static_cast<char>(version % 10);
     buf_[8] = ' ';
     buf_[9] = '0' + static_cast<char>(code / 100);
     buf_[10]= '0' + static_cast<char>((code / 10) % 10);
     buf_[11]= '0' + static_cast<char>(code % 10);
     buf_[12]= ' ';
 
     string_view sv;
     if(! f_.target_or_reason_.empty())
         sv = f_.target_or_reason_;
     else
         sv = obsolete_reason(static_cast<status>(code));
 
     view_.emplace(
         net::const_buffer{buf_, 13},
         net::const_buffer{sv.data(), sv.size()},
         net::const_buffer{"\r\n", 2},
         field_range(f_.list_.begin(), f_.list_.end()),
         chunk_crlf{});
 }
 
 //------------------------------------------------------------------------------
 
 template<class Allocator>
 char*
 basic_fields<Allocator>::
 value_type::
 data() const
 {
     return const_cast<char*>(
         reinterpret_cast<char const*>(
             static_cast<element const*>(this) + 1));
 }
 
 template<class Allocator>
 net::const_buffer
 basic_fields<Allocator>::
 value_type::
 buffer() const
 {
     return net::const_buffer{data(),
         static_cast<std::size_t>(off_) + len_ + 2};
 }
 
 template<class Allocator>
 basic_fields<Allocator>::
 value_type::
 value_type(field name,
     string_view sname, string_view value)
     : off_(static_cast<off_t>(sname.size() + 2))
     , len_(static_cast<off_t>(value.size()))
     , f_(name)
 {
     //BOOST_ASSERT(name == field::unknown ||
     //    iequals(sname, to_string(name)));
     char* p = data();
     p[off_-2] = ':';
     p[off_-1] = ' ';
     p[off_ + len_] = '\r';
     p[off_ + len_ + 1] = '\n';
     sname.copy(p, sname.size());
     value.copy(p + off_, value.size());
 }
 
 template<class Allocator>
 field
 basic_fields<Allocator>::
 value_type::
 name() const
 {
     return f_;
 }
 
 template<class Allocator>
 string_view const
 basic_fields<Allocator>::
 value_type::
 name_string() const
 {
     return {data(),
         static_cast<std::size_t>(off_ - 2)};
 }
 
 template<class Allocator>
 string_view const
 basic_fields<Allocator>::
 value_type::
 value() const
 {
     return {data() + off_,
         static_cast<std::size_t>(len_)};
 }
 
 template<class Allocator>
 basic_fields<Allocator>::
 element::
 element(field name,
     string_view sname, string_view value)
     : value_type(name, sname, value)
 {
 }
 
 //------------------------------------------------------------------------------
 
 template<class Allocator>
 basic_fields<Allocator>::
 ~basic_fields()
 {
     delete_list();
     realloc_string(method_, {});
     realloc_string(
         target_or_reason_, {});
 }
 
 template<class Allocator>
 basic_fields<Allocator>::
 basic_fields(Allocator const& alloc) noexcept
     : boost::empty_value<Allocator>(boost::empty_init_t(), alloc)
 {
 }
 
 template<class Allocator>
 basic_fields<Allocator>::
 basic_fields(basic_fields&& other) noexcept
     : boost::empty_value<Allocator>(boost::empty_init_t(),
         std::move(other.get()))
     , set_(std::move(other.set_))
     , list_(std::move(other.list_))
     , method_(boost::exchange(other.method_, {}))
     , target_or_reason_(boost::exchange(other.target_or_reason_, {}))
 {
 }
 
 template<class Allocator>
 basic_fields<Allocator>::
 basic_fields(basic_fields&& other, Allocator const& alloc)
     : boost::empty_value<Allocator>(boost::empty_init_t(), alloc)
 {
     if(this->get() != other.get())
     {
         copy_all(other);
     }
     else
     {
         set_ = std::move(other.set_);
         list_ = std::move(other.list_);
         method_ = other.method_;
         target_or_reason_ = other.target_or_reason_;
     }
 }
 
 template<class Allocator>
 basic_fields<Allocator>::
 basic_fields(basic_fields const& other)
     : boost::empty_value<Allocator>(boost::empty_init_t(), alloc_traits::
         select_on_container_copy_construction(other.get()))
 {
     copy_all(other);
 }
 
 template<class Allocator>
 basic_fields<Allocator>::
 basic_fields(basic_fields const& other,
         Allocator const& alloc)
     : boost::empty_value<Allocator>(boost::empty_init_t(), alloc)
 {
     copy_all(other);
 }
 
 template<class Allocator>
 template<class OtherAlloc>
 basic_fields<Allocator>::
 basic_fields(basic_fields<OtherAlloc> const& other)
 {
     copy_all(other);
 }
 
 template<class Allocator>
 template<class OtherAlloc>
 basic_fields<Allocator>::
 basic_fields(basic_fields<OtherAlloc> const& other,
         Allocator const& alloc)
     : boost::empty_value<Allocator>(boost::empty_init_t(), alloc)
 {
     copy_all(other);
 }
 
 template<class Allocator>
 auto
 basic_fields<Allocator>::
 operator=(basic_fields&& other) noexcept(
     alloc_traits::propagate_on_container_move_assignment::value)
       -> basic_fields&
 {
     static_assert(is_nothrow_move_assignable<Allocator>::value,
         "Allocator must be noexcept assignable.");
     if(this == &other)
         return *this;
     move_assign(other, std::integral_constant<bool,
         alloc_traits:: propagate_on_container_move_assignment::value>{});
     return *this;
 }
 
 template<class Allocator>
 auto
 basic_fields<Allocator>::
 operator=(basic_fields const& other) ->
     basic_fields&
 {
     copy_assign(other, std::integral_constant<bool,
         alloc_traits::propagate_on_container_copy_assignment::value>{});
     return *this;
 }
 
 template<class Allocator>
 template<class OtherAlloc>
 auto
 basic_fields<Allocator>::
 operator=(basic_fields<OtherAlloc> const& other) ->
     basic_fields&
 {
     clear_all();
     copy_all(other);
     return *this;
 }
 
 //------------------------------------------------------------------------------
 //
 // Element access
 //
 //------------------------------------------------------------------------------
 
 template<class Allocator>
 string_view const
 basic_fields<Allocator>::
 at(field name) const
 {
     BOOST_ASSERT(name != field::unknown);
     auto const it = find(name);
     if(it == end())
         BOOST_THROW_EXCEPTION(std::out_of_range{
             "field not found"});
     return it->value();
 }
 
 template<class Allocator>
 string_view const
 basic_fields<Allocator>::
 at(string_view name) const
 {
     auto const it = find(name);
     if(it == end())
         BOOST_THROW_EXCEPTION(std::out_of_range{
             "field not found"});
     return it->value();
 }
 
 template<class Allocator>
 string_view const
 basic_fields<Allocator>::
 operator[](field name) const
 {
     BOOST_ASSERT(name != field::unknown);
     auto const it = find(name);
     if(it == end())
         return {};
     return it->value();
 }
 
 template<class Allocator>
 string_view const
 basic_fields<Allocator>::
 operator[](string_view name) const
 {
     auto const it = find(name);
     if(it == end())
         return {};
     return it->value();
 }
 
 //------------------------------------------------------------------------------
 //
 // Modifiers
 //
 //------------------------------------------------------------------------------
 
 template<class Allocator>
 void
 basic_fields<Allocator>::
 clear()
 {
     delete_list();
     set_.clear();
     list_.clear();
 }
 
 template<class Allocator>
 inline
 void
 basic_fields<Allocator>::
 insert(field name, string_view const& value)
 {
     BOOST_ASSERT(name != field::unknown);
     insert(name, to_string(name), value);
 }
 
 template<class Allocator>
 void
 basic_fields<Allocator>::
 insert(string_view sname, string_view const& value)
 {
     auto const name =
         string_to_field(sname);
     insert(name, sname, value);
 }
 
 template<class Allocator>
 void
 basic_fields<Allocator>::
 insert(field name,
     string_view sname, string_view const& value)
 {
     auto& e = new_element(name, sname,
         static_cast<string_view>(value));
     auto const before =
         set_.upper_bound(sname, key_compare{});
     if(before == set_.begin())
     {
         BOOST_ASSERT(count(sname) == 0);
         set_.insert_before(before, e);
         list_.push_back(e);
         return;
     }
     auto const last = std::prev(before);
     // VFALCO is it worth comparing `field name` first?
     if(! beast::iequals(sname, last->name_string()))
     {
         BOOST_ASSERT(count(sname) == 0);
         set_.insert_before(before, e);
         list_.push_back(e);
         return;
     }
     // keep duplicate fields together in the list
     set_.insert_before(before, e);
     list_.insert(++list_.iterator_to(*last), e);
 }
 
 template<class Allocator>
 void
 basic_fields<Allocator>::
 set(field name, string_view const& value)
 {
     BOOST_ASSERT(name != field::unknown);
     set_element(new_element(name, to_string(name),
         static_cast<string_view>(value)));
 }
 
 template<class Allocator>
 void
 basic_fields<Allocator>::
 set(string_view sname, string_view const& value)
 {
     set_element(new_element(
         string_to_field(sname), sname, value));
 }
 
 template<class Allocator>
 auto
 basic_fields<Allocator>::
 erase(const_iterator pos) ->
     const_iterator
 {
     auto next = pos;
     auto& e = *next++;
     set_.erase(set_.iterator_to(e));
     list_.erase(pos);
     delete_element(const_cast<element&>(e));
     return next;
 }
 
 template<class Allocator>
 std::size_t
 basic_fields<Allocator>::
 erase(field name)
 {
     BOOST_ASSERT(name != field::unknown);
     return erase(to_string(name));
 }
 
 template<class Allocator>
 std::size_t
 basic_fields<Allocator>::
 erase(string_view name)
 {
     std::size_t n =0;
     set_.erase_and_dispose(name, key_compare{},
         [&](element* e)
         {
             ++n;
             list_.erase(list_.iterator_to(*e));
             delete_element(*e);
         });
     return n;
 }
 
 template<class Allocator>
 void
 basic_fields<Allocator>::
 swap(basic_fields<Allocator>& other)
 {
     swap(other, std::integral_constant<bool,
         alloc_traits::propagate_on_container_swap::value>{});
 }
 
 template<class Allocator>
 void
 swap(
     basic_fields<Allocator>& lhs,
     basic_fields<Allocator>& rhs)
 {
     lhs.swap(rhs);
 }
 
 //------------------------------------------------------------------------------
 //
 // Lookup
 //
 //------------------------------------------------------------------------------
 
 template<class Allocator>
 inline
 std::size_t
 basic_fields<Allocator>::
 count(field name) const
 {
     BOOST_ASSERT(name != field::unknown);
     return count(to_string(name));
 }
 
 template<class Allocator>
 std::size_t
 basic_fields<Allocator>::
 count(string_view name) const
 {
     return set_.count(name, key_compare{});
 }
 
 template<class Allocator>
 inline
 auto
 basic_fields<Allocator>::
 find(field name) const ->
     const_iterator
 {
     BOOST_ASSERT(name != field::unknown);
     return find(to_string(name));
 }
 
 template<class Allocator>
 auto
 basic_fields<Allocator>::
 find(string_view name) const ->
     const_iterator
 {
     auto const it = set_.find(
         name, key_compare{});
     if(it == set_.end())
         return list_.end();
     return list_.iterator_to(*it);
 }
 
 template<class Allocator>
 inline
 auto
 basic_fields<Allocator>::
 equal_range(field name) const ->
     std::pair<const_iterator, const_iterator>
 {
     BOOST_ASSERT(name != field::unknown);
     return equal_range(to_string(name));
 }
 
 template<class Allocator>
 auto
 basic_fields<Allocator>::
 equal_range(string_view name) const ->
     std::pair<const_iterator, const_iterator>
 {
     auto result =
         set_.equal_range(name, key_compare{});
     if(result.first == result.second)
         return {list_.end(), list_.end()};
     return {
         list_.iterator_to(*result.first),
         ++list_.iterator_to(*(--result.second))};
 }
 
 //------------------------------------------------------------------------------
 
 namespace detail {
 
 struct iequals_predicate
 {
     bool
     operator()(string_view s) const
     {
         return beast::iequals(s, sv1) || beast::iequals(s, sv2);
     }
 
     string_view sv1;
     string_view sv2;
 };
 
 // Filter the last item in a token list
 BOOST_BEAST_DECL
 void
 filter_token_list_last(
     beast::detail::temporary_buffer& s,
     string_view value,
     iequals_predicate const& pred);
 
 BOOST_BEAST_DECL
 void
 keep_alive_impl(
     beast::detail::temporary_buffer& s, string_view value,
     unsigned version, bool keep_alive);
 
 } // detail
 
 //------------------------------------------------------------------------------
 
 // Fields
 
 template<class Allocator>
 inline
 string_view
 basic_fields<Allocator>::
 get_method_impl() const
 {
     return method_;
 }
 
 template<class Allocator>
 inline
 string_view
 basic_fields<Allocator>::
 get_target_impl() const
 {
     if(target_or_reason_.empty())
         return target_or_reason_;
     return {
         target_or_reason_.data() + 1,
         target_or_reason_.size() - 1};
 }
 
 template<class Allocator>
 inline
 string_view
 basic_fields<Allocator>::
 get_reason_impl() const
 {
     return target_or_reason_;
 }
 
 template<class Allocator>
 bool
 basic_fields<Allocator>::
 get_chunked_impl() const
 {
     auto const te = token_list{
         (*this)[field::transfer_encoding]};
     for(auto it = te.begin(); it != te.end();)
     {
         auto const next = std::next(it);
         if(next == te.end())
             return beast::iequals(*it, "chunked");
         it = next;
     }
     return false;
 }
 
 template<class Allocator>
 bool
 basic_fields<Allocator>::
 get_keep_alive_impl(unsigned version) const
 {
     auto const it = find(field::connection);
     if(version < 11)
     {
         if(it == end())
             return false;
         return token_list{
             it->value()}.exists("keep-alive");
     }
     if(it == end())
         return true;
     return ! token_list{
         it->value()}.exists("close");
 }
 
 template<class Allocator>
 bool
 basic_fields<Allocator>::
 has_content_length_impl() const
 {
     return count(field::content_length) > 0;
 }
 
 template<class Allocator>
 inline
 void
 basic_fields<Allocator>::
 set_method_impl(string_view s)
 {
     realloc_string(method_, s);
 }
 
 template<class Allocator>
 inline
 void
 basic_fields<Allocator>::
 set_target_impl(string_view s)
 {
     realloc_target(
         target_or_reason_, s);
 }
 
 template<class Allocator>
 inline
 void
 basic_fields<Allocator>::
 set_reason_impl(string_view s)
 {
     realloc_string(
         target_or_reason_, s);
 }
 
 template<class Allocator>
 void
 basic_fields<Allocator>::
 set_chunked_impl(bool value)
 {
     beast::detail::temporary_buffer buf;
     auto it = find(field::transfer_encoding);
     if(value)
     {
         // append "chunked"
         if(it == end())
         {
             set(field::transfer_encoding, "chunked");
             return;
         }
         auto const te = token_list{it->value()};
         for(auto itt = te.begin();;)
         {
             auto const next = std::next(itt);
             if(next == te.end())
             {
                 if(beast::iequals(*itt, "chunked"))
                     return; // already set
                 break;
             }
             itt = next;
         }
 
         buf.append(it->value(), ", chunked");
         set(field::transfer_encoding, buf.view());
         return;
     }
     // filter "chunked"
     if(it == end())
         return;
 
     detail::filter_token_list_last(buf, it->value(), {"chunked", {}});
     if(! buf.empty())
         set(field::transfer_encoding, buf.view());
     else
         erase(field::transfer_encoding);
 }
 
 template<class Allocator>
 void
 basic_fields<Allocator>::
 set_content_length_impl(
     boost::optional<std::uint64_t> const& value)
 {
     if(! value)
         erase(field::content_length);
     else
     {
         auto s = to_static_string(*value);
         set(field::content_length,
             to_string_view(s));
     }
 }
 
 template<class Allocator>
 void
 basic_fields<Allocator>::
 set_keep_alive_impl(
     unsigned version, bool keep_alive)
 {
     // VFALCO What about Proxy-Connection ?
     auto const value = (*this)[field::connection];
     beast::detail::temporary_buffer buf;
     detail::keep_alive_impl(buf, value, version, keep_alive);
     if(buf.empty())
         erase(field::connection);
     else
         set(field::connection, buf.view());
 }
 
 //------------------------------------------------------------------------------
 
 template<class Allocator>
 auto
 basic_fields<Allocator>::
 new_element(field name,
     string_view sname, string_view value) ->
         element&
 {
     if(sname.size() + 2 >
             (std::numeric_limits<off_t>::max)())
         BOOST_THROW_EXCEPTION(std::length_error{
             "field name too large"});
     if(value.size() + 2 >
             (std::numeric_limits<off_t>::max)())
         BOOST_THROW_EXCEPTION(std::length_error{
             "field value too large"});
     value = detail::trim(value);
     std::uint16_t const off =
         static_cast<off_t>(sname.size() + 2);
     std::uint16_t const len =
         static_cast<off_t>(value.size());
     auto a = rebind_type{this->get()};
     auto const p = alloc_traits::allocate(a,
         (sizeof(element) + off + len + 2 + sizeof(align_type) - 1) /
             sizeof(align_type));
     return *(::new(p) element(name, sname, value));
 }
 
 template<class Allocator>
 void
 basic_fields<Allocator>::
 delete_element(element& e)
 {
     auto a = rebind_type{this->get()};
     auto const n =
         (sizeof(element) + e.off_ + e.len_ + 2 + sizeof(align_type) - 1) /
             sizeof(align_type);
     e.~element();
     alloc_traits::deallocate(a,
         reinterpret_cast<align_type*>(&e), n);
 }
 
 template<class Allocator>
 void
 basic_fields<Allocator>::
 set_element(element& e)
 {
     auto it = set_.lower_bound(
         e.name_string(), key_compare{});
     if(it == set_.end() || ! beast::iequals(
         e.name_string(), it->name_string()))
     {
         set_.insert_before(it, e);
         list_.push_back(e);
         return;
     }
     for(;;)
     {
         auto next = it;
         ++next;
         set_.erase(it);
         list_.erase(list_.iterator_to(*it));
         delete_element(*it);
         it = next;
         if(it == set_.end() ||
             ! beast::iequals(e.name_string(), it->name_string()))
             break;
     }
     set_.insert_before(it, e);
     list_.push_back(e);
 }
 
 template<class Allocator>
 void
 basic_fields<Allocator>::
 realloc_string(string_view& dest, string_view s)
 {
     if(dest.empty() && s.empty())
         return;
     auto a = typename beast::detail::allocator_traits<
         Allocator>::template rebind_alloc<
             char>(this->get());
     char* p = nullptr;
     if(! s.empty())
     {
         p = a.allocate(s.size());
         s.copy(p, s.size());
     }
     if(! dest.empty())
         a.deallocate(const_cast<char*>(
             dest.data()), dest.size());
     if(p)
         dest = {p, s.size()};
     else
         dest = {};
 }
 
 template<class Allocator>
 void
 basic_fields<Allocator>::
 realloc_target(
     string_view& dest, string_view s)
 {
     // The target string are stored with an
     // extra space at the beginning to help
     // the writer class.
     if(dest.empty() && s.empty())
         return;
     auto a = typename beast::detail::allocator_traits<
         Allocator>::template rebind_alloc<
             char>(this->get());
     char* p = nullptr;
     if(! s.empty())
     {
         p = a.allocate(1 + s.size());
         p[0] = ' ';
         s.copy(p + 1, s.size());
     }
     if(! dest.empty())
         a.deallocate(const_cast<char*>(
             dest.data()), dest.size());
     if(p)
         dest = {p, 1 + s.size()};
     else
         dest = {};
 }
 
 template<class Allocator>
 template<class OtherAlloc>
 void
 basic_fields<Allocator>::
 copy_all(basic_fields<OtherAlloc> const& other)
 {
     for(auto const& e : other.list_)
         insert(e.name(), e.name_string(), e.value());
     realloc_string(method_, other.method_);
     realloc_string(target_or_reason_,
         other.target_or_reason_);
 }
 
 template<class Allocator>
 void
 basic_fields<Allocator>::
 clear_all()
 {
     clear();
     realloc_string(method_, {});
     realloc_string(target_or_reason_, {});
 }
 
 template<class Allocator>
 void
 basic_fields<Allocator>::
 delete_list()
 {
     for(auto it = list_.begin(); it != list_.end();)
         delete_element(*it++);
 }
 
 //------------------------------------------------------------------------------
 
 template<class Allocator>
 inline
 void
 basic_fields<Allocator>::
 move_assign(basic_fields& other, std::true_type)
 {
     clear_all();
     set_ = std::move(other.set_);
     list_ = std::move(other.list_);
     method_ = other.method_;
     target_or_reason_ = other.target_or_reason_;
     other.method_ = {};
     other.target_or_reason_ = {};
     this->get() = other.get();
 }
 
 template<class Allocator>
 inline
 void
 basic_fields<Allocator>::
 move_assign(basic_fields& other, std::false_type)
 {
     clear_all();
     if(this->get() != other.get())
     {
         copy_all(other);
     }
     else
     {
         set_ = std::move(other.set_);
         list_ = std::move(other.list_);
         method_ = other.method_;
         target_or_reason_ = other.target_or_reason_;
         other.method_ = {};
         other.target_or_reason_ = {};
     }
 }
 
 template<class Allocator>
 inline
 void
 basic_fields<Allocator>::
 copy_assign(basic_fields const& other, std::true_type)
 {
     clear_all();
     this->get() = other.get();
     copy_all(other);
 }
 
 template<class Allocator>
 inline
 void
 basic_fields<Allocator>::
 copy_assign(basic_fields const& other, std::false_type)
 {
     clear_all();
     copy_all(other);
 }
 
 template<class Allocator>
 inline
 void
 basic_fields<Allocator>::
 swap(basic_fields& other, std::true_type)
 {
     using std::swap;
     swap(this->get(), other.get());
     swap(set_, other.set_);
     swap(list_, other.list_);
     swap(method_, other.method_);
     swap(target_or_reason_, other.target_or_reason_);
 }
 
 template<class Allocator>
 inline
 void
 basic_fields<Allocator>::
 swap(basic_fields& other, std::false_type)
 {
     BOOST_ASSERT(this->get() == other.get());
     using std::swap;
     swap(set_, other.set_);
     swap(list_, other.list_);
     swap(method_, other.method_);
     swap(target_or_reason_, other.target_or_reason_);
 }
 
 } // http
 } // beast
 } // boost
 
 #ifdef BOOST_BEAST_HEADER_ONLY
 #include <boost/beast/http/impl/fields.ipp>
 #endif
 
 #endif

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