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- //
- // detail/executor_function.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_EXECUTOR_FUNCTION_HPP
- #define BOOST_ASIO_DETAIL_EXECUTOR_FUNCTION_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_alloc_helpers.hpp>
- #include <boost/asio/detail/push_options.hpp>
- namespace boost {
- namespace asio {
- namespace detail {
- class executor_function_base
- {
- public:
- void complete()
- {
- func_(this, true);
- }
- void destroy()
- {
- func_(this, false);
- }
- protected:
- typedef void (*func_type)(executor_function_base*, bool);
- executor_function_base(func_type func)
- : func_(func)
- {
- }
- // Prevents deletion through this type.
- ~executor_function_base()
- {
- }
- private:
- func_type func_;
- };
- template <typename Function, typename Alloc>
- class executor_function : public executor_function_base
- {
- public:
- BOOST_ASIO_DEFINE_TAGGED_HANDLER_ALLOCATOR_PTR(
- thread_info_base::executor_function_tag, executor_function);
- template <typename F>
- executor_function(BOOST_ASIO_MOVE_ARG(F) f, const Alloc& allocator)
- : executor_function_base(&executor_function::do_complete),
- function_(BOOST_ASIO_MOVE_CAST(F)(f)),
- allocator_(allocator)
- {
- }
- static void do_complete(executor_function_base* base, bool call)
- {
- // Take ownership of the function object.
- executor_function* o(static_cast<executor_function*>(base));
- Alloc allocator(o->allocator_);
- ptr p = { detail::addressof(allocator), o, o };
- // Make a copy of the function so that the memory can be deallocated before
- // the upcall is made. Even if we're not about to make an upcall, a
- // sub-object of the function may be the true owner of the memory
- // associated with the function. Consequently, a local copy of the function
- // is required to ensure that any owning sub-object remains valid until
- // after we have deallocated the memory here.
- Function function(BOOST_ASIO_MOVE_CAST(Function)(o->function_));
- p.reset();
- // Make the upcall if required.
- if (call)
- {
- function();
- }
- }
- private:
- Function function_;
- Alloc allocator_;
- };
- } // namespace detail
- } // namespace asio
- } // namespace boost
- #include <boost/asio/detail/pop_options.hpp>
- #endif // BOOST_ASIO_DETAIL_EXECUTOR_FUNCTION_HPP
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