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diff --git a/lib/asio/dispatch.hpp b/lib/asio/dispatch.hpp
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+//
+// dispatch.hpp
+// ~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2018 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 ASIO_DISPATCH_HPP
+#define ASIO_DISPATCH_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include "asio/async_result.hpp"
+#include "asio/detail/type_traits.hpp"
+#include "asio/execution_context.hpp"
+#include "asio/is_executor.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+
+/// Submits a completion token or function object for execution.
+/**
+ * This function submits an object for execution using the object's associated
+ * executor. The function object is queued for execution, and is never called
+ * from the current thread prior to returning from <tt>dispatch()</tt>.
+ *
+ * This function has the following effects:
+ *
+ * @li Constructs a function object handler of type @c Handler, initialized
+ * with <tt>handler(forward<CompletionToken>(token))</tt>.
+ *
+ * @li Constructs an object @c result of type <tt>async_result<Handler></tt>,
+ * initializing the object as <tt>result(handler)</tt>.
+ *
+ * @li Obtains the handler's associated executor object @c ex by performing
+ * <tt>get_associated_executor(handler)</tt>.
+ *
+ * @li Obtains the handler's associated allocator object @c alloc by performing
+ * <tt>get_associated_allocator(handler)</tt>.
+ *
+ * @li Performs <tt>ex.dispatch(std::move(handler), alloc)</tt>.
+ *
+ * @li Returns <tt>result.get()</tt>.
+ */
+template <typename CompletionToken>
+ASIO_INITFN_RESULT_TYPE(CompletionToken, void()) dispatch(
+    ASIO_MOVE_ARG(CompletionToken) token);
+
+/// Submits a completion token or function object for execution.
+/**
+ * This function submits an object for execution using the specified executor.
+ * The function object is queued for execution, and is never called from the
+ * current thread prior to returning from <tt>dispatch()</tt>.
+ *
+ * This function has the following effects:
+ *
+ * @li Constructs a function object handler of type @c Handler, initialized
+ * with <tt>handler(forward<CompletionToken>(token))</tt>.
+ *
+ * @li Constructs an object @c result of type <tt>async_result<Handler></tt>,
+ * initializing the object as <tt>result(handler)</tt>.
+ *
+ * @li Obtains the handler's associated executor object @c ex1 by performing
+ * <tt>get_associated_executor(handler)</tt>.
+ *
+ * @li Creates a work object @c w by performing <tt>make_work(ex1)</tt>.
+ *
+ * @li Obtains the handler's associated allocator object @c alloc by performing
+ * <tt>get_associated_allocator(handler)</tt>.
+ *
+ * @li Constructs a function object @c f with a function call operator that
+ * performs <tt>ex1.dispatch(std::move(handler), alloc)</tt> followed by
+ * <tt>w.reset()</tt>.
+ *
+ * @li Performs <tt>Executor(ex).dispatch(std::move(f), alloc)</tt>.
+ *
+ * @li Returns <tt>result.get()</tt>.
+ */
+template <typename Executor, typename CompletionToken>
+ASIO_INITFN_RESULT_TYPE(CompletionToken, void()) dispatch(
+    const Executor& ex, ASIO_MOVE_ARG(CompletionToken) token,
+    typename enable_if<is_executor<Executor>::value>::type* = 0);
+
+/// Submits a completion token or function object for execution.
+/**
+ * @returns <tt>dispatch(ctx.get_executor(),
+ * forward<CompletionToken>(token))</tt>.
+ */
+template <typename ExecutionContext, typename CompletionToken>
+ASIO_INITFN_RESULT_TYPE(CompletionToken, void()) dispatch(
+    ExecutionContext& ctx, ASIO_MOVE_ARG(CompletionToken) token,
+    typename enable_if<is_convertible<
+      ExecutionContext&, execution_context&>::value>::type* = 0);
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/impl/dispatch.hpp"
+
+#endif // ASIO_DISPATCH_HPP