The code means: boost::asio::require( // #3 io_context->get_executor(), // #1 boost::asio::execution::outstanding_work.tracked) // #2 #1: given this executor, #2: try to construct a similar executor which tracks the outstanding io operations associated with it (i.e. does not stop until all work is complete) #3: require that this tracking attribute is available (fail to compile if the executor does not support it) On Sun, 6 Jun 2021 at 17:13, ZheNing Hu via Boost-users < boost-users@lists.boost.org> wrote:

Hi, I ran into difficulties when I was reading boost::asio http server example[1],

I see:

work_.push_back( boost::asio::require(io_context->get_executor(),

boost::asio::execution::outstanding_work.tracked));

I don't know what is the meaning of this code? Or what is boost::asio::require()? I did not find useful information to introduce it.

[1] https://www.boost.org/doc/libs/1_76_0/doc/html/boost_asio/example/cpp03/http...

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