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0c340c786a
The experimental::deferred completion token takes a call to an
asynchronous operation's initiating function and turns it into a
function object that accepts a completion token. For example:
auto deferred_op =
timer.async_wait(
boost::asio::experimental::deferred);
...
std::move(deferred_op)(
[](std::error_code ec){ ... });
or
auto deferred_op =
timer.async_wait(
boost::asio::experimental::deferred);
...
std::future<void> =
std::move(deferred_op)(
boost::asio::use_future);
The deferred token also supports chaining, to create simple
compositions:
auto deferred_op =
timer.async_wait(
boost::asio::experimental::deferred(
[&](std::error_code ec)
{
timer.expires_after(
std::chrono::seconds(1));
return timer.async_wait(
boost::asio::experimental::deferred);
});
...
std::future<void> = std::move(deferred_op)(boost::asio::use_future);
39 lines
1.2 KiB
Plaintext
39 lines
1.2 KiB
Plaintext
#
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# Copyright (c) 2003-2021 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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lib socket ; # SOLARIS
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lib nsl ; # SOLARIS
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lib ws2_32 ; # NT
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lib mswsock ; # NT
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lib ipv6 ; # HPUX
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lib network ; # HAIKU
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project
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: requirements
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<library>/boost/system//boost_system
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<library>/boost/chrono//boost_chrono
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<define>BOOST_ALL_NO_LIB=1
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<threading>multi
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<target-os>solaris:<library>socket
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<target-os>solaris:<library>nsl
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<target-os>windows:<define>_WIN32_WINNT=0x0501
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<target-os>windows,<toolset>gcc:<library>ws2_32
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<target-os>windows,<toolset>gcc:<library>mswsock
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<target-os>windows,<toolset>gcc-cygwin:<define>__USE_W32_SOCKETS
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<target-os>hpux,<toolset>gcc:<define>_XOPEN_SOURCE_EXTENDED
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<target-os>hpux:<library>ipv6
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<target-os>haiku:<library>network
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;
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exe deferred_1 : deferred_1.cpp ;
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exe deferred_2 : deferred_2.cpp ;
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exe deferred_3 : deferred_3.cpp ;
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exe deferred_4 : deferred_4.cpp ;
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exe deferred_5 : deferred_5.cpp ;
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exe deferred_6 : deferred_6.cpp ;
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exe deferred_7 : deferred_7.cpp ;
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