add boost on mac

macx64/include/boost/asio/detail/io_object_executor.hpp

@@ -0,0 +1,162 @@
+//
+// io_object_executor.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff 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)
+//
+
+#ifndef BOOST_ASIO_DETAIL_IO_OBJECT_EXECUTOR_HPP
+#define BOOST_ASIO_DETAIL_IO_OBJECT_EXECUTOR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+#include <boost/asio/detail/handler_invoke_helpers.hpp>
+#include <boost/asio/detail/type_traits.hpp>
+#include <boost/asio/io_context.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+namespace detail {
+
+// Wrap the (potentially polymorphic) executor so that we can bypass it when
+// dispatching on a target executor that has a native I/O implementation.
+template <typename Executor>
+class io_object_executor
+{
+public:
+  io_object_executor(const Executor& ex,
+      bool native_implementation) BOOST_ASIO_NOEXCEPT
+    : executor_(ex),
+      has_native_impl_(native_implementation)
+  {
+  }
+
+  io_object_executor(const io_object_executor& other) BOOST_ASIO_NOEXCEPT
+    : executor_(other.executor_),
+      has_native_impl_(other.has_native_impl_)
+  {
+  }
+
+  template <typename Executor1>
+  io_object_executor(
+      const io_object_executor<Executor1>& other) BOOST_ASIO_NOEXCEPT
+    : executor_(other.inner_executor()),
+      has_native_impl_(other.has_native_implementation())
+  {
+  }
+
+#if defined(BOOST_ASIO_HAS_MOVE)
+  io_object_executor(io_object_executor&& other) BOOST_ASIO_NOEXCEPT
+    : executor_(BOOST_ASIO_MOVE_CAST(Executor)(other.executor_)),
+      has_native_impl_(other.has_native_impl_)
+  {
+  }
+#endif // defined(BOOST_ASIO_HAS_MOVE)
+
+  const Executor& inner_executor() const BOOST_ASIO_NOEXCEPT
+  {
+    return executor_;
+  }
+
+  bool has_native_implementation() const BOOST_ASIO_NOEXCEPT
+  {
+    return has_native_impl_;
+  }
+
+  execution_context& context() const BOOST_ASIO_NOEXCEPT
+  {
+    return executor_.context();
+  }
+
+  void on_work_started() const BOOST_ASIO_NOEXCEPT
+  {
+    if (is_same<Executor, io_context::executor_type>::value
+        || has_native_impl_)
+    {
+      // When using a native implementation, work is already counted by the
+      // execution context.
+    }
+    else
+    {
+      executor_.on_work_started();
+    }
+  }
+
+  void on_work_finished() const BOOST_ASIO_NOEXCEPT
+  {
+    if (is_same<Executor, io_context::executor_type>::value
+        || has_native_impl_)
+    {
+      // When using a native implementation, work is already counted by the
+      // execution context.
+    }
+    else
+    {
+      executor_.on_work_finished();
+    }
+  }
+
+  template <typename F, typename A>
+  void dispatch(BOOST_ASIO_MOVE_ARG(F) f, const A& a) const
+  {
+    if (is_same<Executor, io_context::executor_type>::value
+        || has_native_impl_)
+    {
+      // When using a native implementation, I/O completion handlers are
+      // already dispatched according to the execution context's executor's
+      // rules. We can call the function directly.
+      typename decay<F>::type function(BOOST_ASIO_MOVE_CAST(F)(f));
+      boost_asio_handler_invoke_helpers::invoke(function, function);
+    }
+    else
+    {
+      executor_.dispatch(BOOST_ASIO_MOVE_CAST(F)(f), a);
+    }
+  }
+
+  template <typename F, typename A>
+  void post(BOOST_ASIO_MOVE_ARG(F) f, const A& a) const
+  {
+    executor_.post(BOOST_ASIO_MOVE_CAST(F)(f), a);
+  }
+
+  template <typename F, typename A>
+  void defer(BOOST_ASIO_MOVE_ARG(F) f, const A& a) const
+  {
+    executor_.defer(BOOST_ASIO_MOVE_CAST(F)(f), a);
+  }
+
+  friend bool operator==(const io_object_executor& a,
+      const io_object_executor& b) BOOST_ASIO_NOEXCEPT
+  {
+    return a.executor_ == b.executor_
+      && a.has_native_impl_ == b.has_native_impl_;
+  }
+
+  friend bool operator!=(const io_object_executor& a,
+      const io_object_executor& b) BOOST_ASIO_NOEXCEPT
+  {
+    return a.executor_ != b.executor_
+      || a.has_native_impl_ != b.has_native_impl_;
+  }
+
+private:
+  Executor executor_;
+  const bool has_native_impl_;
+};
+
+} // namespace detail
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_DETAIL_IO_OBJECT_EXECUTOR_HPP