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107 lines
2.6 KiB
C++
107 lines
2.6 KiB
C++
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//
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// detail/executor_function.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef BOOST_ASIO_DETAIL_EXECUTOR_FUNCTION_HPP
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#define BOOST_ASIO_DETAIL_EXECUTOR_FUNCTION_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include <boost/asio/detail/config.hpp>
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#include <boost/asio/detail/handler_alloc_helpers.hpp>
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#include <boost/asio/detail/push_options.hpp>
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namespace boost {
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namespace asio {
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namespace detail {
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class executor_function_base
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{
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public:
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void complete()
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{
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func_(this, true);
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}
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void destroy()
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{
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func_(this, false);
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}
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protected:
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typedef void (*func_type)(executor_function_base*, bool);
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executor_function_base(func_type func)
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: func_(func)
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{
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}
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// Prevents deletion through this type.
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~executor_function_base()
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{
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}
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private:
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func_type func_;
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};
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template <typename Function, typename Alloc>
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class executor_function : public executor_function_base
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{
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public:
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BOOST_ASIO_DEFINE_TAGGED_HANDLER_ALLOCATOR_PTR(
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thread_info_base::executor_function_tag, executor_function);
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template <typename F>
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executor_function(BOOST_ASIO_MOVE_ARG(F) f, const Alloc& allocator)
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: executor_function_base(&executor_function::do_complete),
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function_(BOOST_ASIO_MOVE_CAST(F)(f)),
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allocator_(allocator)
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{
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}
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static void do_complete(executor_function_base* base, bool call)
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{
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// Take ownership of the function object.
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executor_function* o(static_cast<executor_function*>(base));
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Alloc allocator(o->allocator_);
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ptr p = { detail::addressof(allocator), o, o };
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// Make a copy of the function so that the memory can be deallocated before
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// the upcall is made. Even if we're not about to make an upcall, a
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// sub-object of the function may be the true owner of the memory
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// associated with the function. Consequently, a local copy of the function
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// is required to ensure that any owning sub-object remains valid until
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// after we have deallocated the memory here.
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Function function(BOOST_ASIO_MOVE_CAST(Function)(o->function_));
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p.reset();
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// Make the upcall if required.
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if (call)
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{
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function();
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}
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}
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private:
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Function function_;
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Alloc allocator_;
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};
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} // namespace detail
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} // namespace asio
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} // namespace boost
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#include <boost/asio/detail/pop_options.hpp>
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#endif // BOOST_ASIO_DETAIL_EXECUTOR_FUNCTION_HPP
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