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71 lines
1.8 KiB
C++
71 lines
1.8 KiB
C++
// Copyright 2003-2013 Christopher M. Kohlhoff
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// Copyright Oliver Kowalke, Nat Goodspeed 2015.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_FIBERS_ASIO_YIELD_HPP
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#define BOOST_FIBERS_ASIO_YIELD_HPP
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#include <boost/config.hpp>
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#ifdef BOOST_HAS_ABI_HEADERS
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# include BOOST_ABI_PREFIX
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#endif
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namespace boost {
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namespace fibers {
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namespace asio {
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//[fibers_asio_yield
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class yield_t {
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public:
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yield_t( bool hop) :
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allow_hop_( hop) {
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}
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/**
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* @code
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* static yield_t yield;
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* boost::system::error_code myec;
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* func(yield[myec]);
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* @endcode
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* @c yield[myec] returns an instance of @c yield_t whose @c ec_ points
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* to @c myec. The expression @c yield[myec] "binds" @c myec to that
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* (anonymous) @c yield_t instance, instructing @c func() to store any
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* @c error_code it might produce into @c myec rather than throwing @c
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* boost::system::system_error.
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*/
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yield_t operator[]( boost::system::error_code & ec) const {
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yield_t tmp{ * this };
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tmp.ec_ = & ec;
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return tmp;
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}
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//private:
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// ptr to bound error_code instance if any
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boost::system::error_code * ec_{ nullptr };
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// allow calling fiber to "hop" to another thread if it could resume more
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// quickly that way
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bool allow_hop_;
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};
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//]
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//[fibers_asio_yield_and_hop
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// canonical instance with allow_hop_ == false
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thread_local yield_t yield{ false };
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// canonical instance with allow_hop_ == true
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thread_local yield_t yield_hop{ true };
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//]
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}}}
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#ifdef BOOST_HAS_ABI_HEADERS
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# include BOOST_ABI_SUFFIX
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#endif
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#include "detail/yield.hpp"
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#endif // BOOST_FIBERS_ASIO_YIELD_HPP
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