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-rw-r--r--lib/asio/executor.hpp341
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diff --git a/lib/asio/executor.hpp b/lib/asio/executor.hpp
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-//
-// executor.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_EXECUTOR_HPP
-#define ASIO_EXECUTOR_HPP
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1200)
-# pragma once
-#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
-
-#include "asio/detail/config.hpp"
-#include <typeinfo>
-#include "asio/detail/cstddef.hpp"
-#include "asio/detail/memory.hpp"
-#include "asio/detail/throw_exception.hpp"
-#include "asio/execution_context.hpp"
-
-#include "asio/detail/push_options.hpp"
-
-namespace asio {
-
-/// Exception thrown when trying to access an empty polymorphic executor.
-class bad_executor
- : public std::exception
-{
-public:
- /// Constructor.
- ASIO_DECL bad_executor() ASIO_NOEXCEPT;
-
- /// Obtain message associated with exception.
- ASIO_DECL virtual const char* what() const
- ASIO_NOEXCEPT_OR_NOTHROW;
-};
-
-/// Polymorphic wrapper for executors.
-class executor
-{
-public:
- /// Default constructor.
- executor() ASIO_NOEXCEPT
- : impl_(0)
- {
- }
-
- /// Construct from nullptr.
- executor(nullptr_t) ASIO_NOEXCEPT
- : impl_(0)
- {
- }
-
- /// Copy constructor.
- executor(const executor& other) ASIO_NOEXCEPT
- : impl_(other.clone())
- {
- }
-
-#if defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
- /// Move constructor.
- executor(executor&& other) ASIO_NOEXCEPT
- : impl_(other.impl_)
- {
- other.impl_ = 0;
- }
-#endif // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
-
- /// Construct a polymorphic wrapper for the specified executor.
- template <typename Executor>
- executor(Executor e);
-
- /// Allocator-aware constructor to create a polymorphic wrapper for the
- /// specified executor.
- template <typename Executor, typename Allocator>
- executor(allocator_arg_t, const Allocator& a, Executor e);
-
- /// Destructor.
- ~executor()
- {
- destroy();
- }
-
- /// Assignment operator.
- executor& operator=(const executor& other) ASIO_NOEXCEPT
- {
- destroy();
- impl_ = other.clone();
- return *this;
- }
-
-#if defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
- // Move assignment operator.
- executor& operator=(executor&& other) ASIO_NOEXCEPT
- {
- destroy();
- impl_ = other.impl_;
- other.impl_ = 0;
- return *this;
- }
-#endif // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
-
- /// Assignment operator for nullptr_t.
- executor& operator=(nullptr_t) ASIO_NOEXCEPT
- {
- destroy();
- impl_ = 0;
- return *this;
- }
-
- /// Assignment operator to create a polymorphic wrapper for the specified
- /// executor.
- template <typename Executor>
- executor& operator=(ASIO_MOVE_ARG(Executor) e) ASIO_NOEXCEPT
- {
- executor tmp(ASIO_MOVE_CAST(Executor)(e));
- destroy();
- impl_ = tmp.impl_;
- tmp.impl_ = 0;
- return *this;
- }
-
- /// Obtain the underlying execution context.
- execution_context& context() const ASIO_NOEXCEPT
- {
- return get_impl()->context();
- }
-
- /// Inform the executor that it has some outstanding work to do.
- void on_work_started() const ASIO_NOEXCEPT
- {
- get_impl()->on_work_started();
- }
-
- /// Inform the executor that some work is no longer outstanding.
- void on_work_finished() const ASIO_NOEXCEPT
- {
- get_impl()->on_work_finished();
- }
-
- /// Request the executor to invoke the given function object.
- /**
- * This function is used to ask the executor to execute the given function
- * object. The function object is executed according to the rules of the
- * target executor object.
- *
- * @param f The function object to be called. The executor will make a copy
- * of the handler object as required. The function signature of the function
- * object must be: @code void function(); @endcode
- *
- * @param a An allocator that may be used by the executor to allocate the
- * internal storage needed for function invocation.
- */
- template <typename Function, typename Allocator>
- void dispatch(ASIO_MOVE_ARG(Function) f, const Allocator& a) const;
-
- /// Request the executor to invoke the given function object.
- /**
- * This function is used to ask the executor to execute the given function
- * object. The function object is executed according to the rules of the
- * target executor object.
- *
- * @param f The function object to be called. The executor will make
- * a copy of the handler object as required. The function signature of the
- * function object must be: @code void function(); @endcode
- *
- * @param a An allocator that may be used by the executor to allocate the
- * internal storage needed for function invocation.
- */
- template <typename Function, typename Allocator>
- void post(ASIO_MOVE_ARG(Function) f, const Allocator& a) const;
-
- /// Request the executor to invoke the given function object.
- /**
- * This function is used to ask the executor to execute the given function
- * object. The function object is executed according to the rules of the
- * target executor object.
- *
- * @param f The function object to be called. The executor will make
- * a copy of the handler object as required. The function signature of the
- * function object must be: @code void function(); @endcode
- *
- * @param a An allocator that may be used by the executor to allocate the
- * internal storage needed for function invocation.
- */
- template <typename Function, typename Allocator>
- void defer(ASIO_MOVE_ARG(Function) f, const Allocator& a) const;
-
- struct unspecified_bool_type_t {};
- typedef void (*unspecified_bool_type)(unspecified_bool_type_t);
- static void unspecified_bool_true(unspecified_bool_type_t) {}
-
- /// Operator to test if the executor contains a valid target.
- operator unspecified_bool_type() const ASIO_NOEXCEPT
- {
- return impl_ ? &executor::unspecified_bool_true : 0;
- }
-
- /// Obtain type information for the target executor object.
- /**
- * @returns If @c *this has a target type of type @c T, <tt>typeid(T)</tt>;
- * otherwise, <tt>typeid(void)</tt>.
- */
-#if !defined(ASIO_NO_TYPEID) || defined(GENERATING_DOCUMENTATION)
- const std::type_info& target_type() const ASIO_NOEXCEPT
- {
- return impl_ ? impl_->target_type() : typeid(void);
- }
-#else // !defined(ASIO_NO_TYPEID) || defined(GENERATING_DOCUMENTATION)
- const void* target_type() const ASIO_NOEXCEPT
- {
- return impl_ ? impl_->target_type() : 0;
- }
-#endif // !defined(ASIO_NO_TYPEID) || defined(GENERATING_DOCUMENTATION)
-
- /// Obtain a pointer to the target executor object.
- /**
- * @returns If <tt>target_type() == typeid(T)</tt>, a pointer to the stored
- * executor target; otherwise, a null pointer.
- */
- template <typename Executor>
- Executor* target() ASIO_NOEXCEPT;
-
- /// Obtain a pointer to the target executor object.
- /**
- * @returns If <tt>target_type() == typeid(T)</tt>, a pointer to the stored
- * executor target; otherwise, a null pointer.
- */
- template <typename Executor>
- const Executor* target() const ASIO_NOEXCEPT;
-
- /// Compare two executors for equality.
- friend bool operator==(const executor& a,
- const executor& b) ASIO_NOEXCEPT
- {
- if (a.impl_ == b.impl_)
- return true;
- if (!a.impl_ || !b.impl_)
- return false;
- return a.impl_->equals(b.impl_);
- }
-
- /// Compare two executors for inequality.
- friend bool operator!=(const executor& a,
- const executor& b) ASIO_NOEXCEPT
- {
- return !(a == b);
- }
-
-private:
-#if !defined(GENERATING_DOCUMENTATION)
- class function;
- template <typename, typename> class impl;
-
-#if !defined(ASIO_NO_TYPEID)
- typedef const std::type_info& type_id_result_type;
-#else // !defined(ASIO_NO_TYPEID)
- typedef const void* type_id_result_type;
-#endif // !defined(ASIO_NO_TYPEID)
-
- template <typename T>
- static type_id_result_type type_id()
- {
-#if !defined(ASIO_NO_TYPEID)
- return typeid(T);
-#else // !defined(ASIO_NO_TYPEID)
- static int unique_id;
- return &unique_id;
-#endif // !defined(ASIO_NO_TYPEID)
- }
-
- // Base class for all polymorphic executor implementations.
- class impl_base
- {
- public:
- virtual impl_base* clone() const ASIO_NOEXCEPT = 0;
- virtual void destroy() ASIO_NOEXCEPT = 0;
- virtual execution_context& context() ASIO_NOEXCEPT = 0;
- virtual void on_work_started() ASIO_NOEXCEPT = 0;
- virtual void on_work_finished() ASIO_NOEXCEPT = 0;
- virtual void dispatch(ASIO_MOVE_ARG(function)) = 0;
- virtual void post(ASIO_MOVE_ARG(function)) = 0;
- virtual void defer(ASIO_MOVE_ARG(function)) = 0;
- virtual type_id_result_type target_type() const ASIO_NOEXCEPT = 0;
- virtual void* target() ASIO_NOEXCEPT = 0;
- virtual const void* target() const ASIO_NOEXCEPT = 0;
- virtual bool equals(const impl_base* e) const ASIO_NOEXCEPT = 0;
-
- protected:
- impl_base(bool fast_dispatch) : fast_dispatch_(fast_dispatch) {}
- virtual ~impl_base() {}
-
- private:
- friend class executor;
- const bool fast_dispatch_;
- };
-
- // Helper function to check and return the implementation pointer.
- impl_base* get_impl() const
- {
- if (!impl_)
- {
- bad_executor ex;
- asio::detail::throw_exception(ex);
- }
- return impl_;
- }
-
- // Helper function to clone another implementation.
- impl_base* clone() const ASIO_NOEXCEPT
- {
- return impl_ ? impl_->clone() : 0;
- }
-
- // Helper function to destroy an implementation.
- void destroy() ASIO_NOEXCEPT
- {
- if (impl_)
- impl_->destroy();
- }
-
- impl_base* impl_;
-#endif // !defined(GENERATING_DOCUMENTATION)
-};
-
-} // namespace asio
-
-ASIO_USES_ALLOCATOR(asio::executor)
-
-#include "asio/detail/pop_options.hpp"
-
-#include "asio/impl/executor.hpp"
-#if defined(ASIO_HEADER_ONLY)
-# include "asio/impl/executor.ipp"
-#endif // defined(ASIO_HEADER_ONLY)
-
-#endif // ASIO_EXECUTOR_HPP
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