https://github.com/boostorg/beast/issues/1639
https://github.com/boostorg/asio/issues/251

Note that `asio::io_context::strand` is an extension not available in the Networking TS. `asio::strand<E>` is the "standard" type.

On Sat, Jun 22, 2019 at 10:32 AM Fiver Dev via Boost-users <boost-users@lists.boost.org> wrote:
Hello everyone,

How do I create this strand using the io_context of the socket in boost 1.70. 
 
asio::ip::tcp::socket socket;
asio::io_context::strand strand( socket.get_executor().context() );

Thanks
Tom
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