ceph/src/boost/boost/asio/detail/winrt_resolve_op.hpp

   1 //
   2 // detail/winrt_resolve_op.hpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
   6 //
   7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   9 //
  10
  11 #ifndef BOOST_ASIO_DETAIL_WINRT_RESOLVE_OP_HPP
  12 #define BOOST_ASIO_DETAIL_WINRT_RESOLVE_OP_HPP
  13
  14 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  15 # pragma once
  16 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  17
  18 #include <boost/asio/detail/config.hpp>
  19
  20 #if defined(BOOST_ASIO_WINDOWS_RUNTIME)
  21
  22 #include <boost/asio/detail/bind_handler.hpp>
  23 #include <boost/asio/detail/fenced_block.hpp>
  24 #include <boost/asio/detail/handler_alloc_helpers.hpp>
  25 #include <boost/asio/detail/handler_invoke_helpers.hpp>
  26 #include <boost/asio/detail/handler_work.hpp>
  27 #include <boost/asio/detail/memory.hpp>
  28 #include <boost/asio/detail/winrt_async_op.hpp>
  29 #include <boost/asio/ip/basic_resolver_results.hpp>
  30 #include <boost/asio/error.hpp>
  31
  32 #include <boost/asio/detail/push_options.hpp>
  33
  34 namespace boost {
  35 namespace asio {
  36 namespace detail {
  37
  38 template <typename Protocol, typename Handler, typename IoExecutor>
  39 class winrt_resolve_op :
  40   public winrt_async_op<
  41     Windows::Foundation::Collections::IVectorView<
  42       Windows::Networking::EndpointPair^>^>
  43 {
  44 public:
  45   BOOST_ASIO_DEFINE_HANDLER_PTR(winrt_resolve_op);
  46
  47   typedef typename Protocol::endpoint endpoint_type;
  48   typedef boost::asio::ip::basic_resolver_query<Protocol> query_type;
  49   typedef boost::asio::ip::basic_resolver_results<Protocol> results_type;
  50
  51   winrt_resolve_op(const query_type& query,
  52       Handler& handler, const IoExecutor& io_ex)
  53     : winrt_async_op<
  54         Windows::Foundation::Collections::IVectorView<
  55           Windows::Networking::EndpointPair^>^>(
  56             &winrt_resolve_op::do_complete),
  57       query_(query),
  58       handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler)),
  59       work_(handler_, io_ex)
  60   {
  61   }
  62
  63   static void do_complete(void* owner, operation* base,
  64       const boost::system::error_code&, std::size_t)
  65   {
  66     // Take ownership of the operation object.
  67     winrt_resolve_op* o(static_cast<winrt_resolve_op*>(base));
  68     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
  69
  70     BOOST_ASIO_HANDLER_COMPLETION((*o));
  71
  72     // Take ownership of the operation's outstanding work.
  73     handler_work<Handler, IoExecutor> w(
  74         BOOST_ASIO_MOVE_CAST2(handler_work<Handler, IoExecutor>)(
  75           o->work_));
  76
  77     results_type results = results_type();
  78     if (!o->ec_)
  79     {
  80       try
  81       {
  82         results = results_type::create(o->result_, o->query_.hints(),
  83             o->query_.host_name(), o->query_.service_name());
  84       }
  85       catch (Platform::Exception^ e)
  86       {
  87         o->ec_ = boost::system::error_code(e->HResult,
  88             boost::system::system_category());
  89       }
  90     }
  91
  92     // Make a copy of the handler so that the memory can be deallocated before
  93     // the upcall is made. Even if we're not about to make an upcall, a
  94     // sub-object of the handler may be the true owner of the memory associated
  95     // with the handler. Consequently, a local copy of the handler is required
  96     // to ensure that any owning sub-object remains valid until after we have
  97     // deallocated the memory here.
  98     detail::binder2<Handler, boost::system::error_code, results_type>
  99       handler(o->handler_, o->ec_, results);
 100     p.h = boost::asio::detail::addressof(handler.handler_);
 101     p.reset();
 102
 103     // Make the upcall if required.
 104     if (owner)
 105     {
 106       fenced_block b(fenced_block::half);
 107       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, "..."));
 108       w.complete(handler, handler.handler_);
 109       BOOST_ASIO_HANDLER_INVOCATION_END;
 110     }
 111   }
 112
 113 private:
 114   query_type query_;
 115   Handler handler_;
 116   handler_work<Handler, IoExecutor> executor_;
 117 };
 118
 119 } // namespace detail
 120 } // namespace asio
 121 } // namespace boost
 122
 123 #include <boost/asio/detail/pop_options.hpp>
 124
 125 #endif // defined(BOOST_ASIO_WINDOWS_RUNTIME)
 126
 127 #endif // BOOST_ASIO_DETAIL_WINRT_RESOLVE_OP_HPP