I've been discussing a very similar thing with Vinnie Falco, here: https://github.com/boostorg/beast/issues/1366 On Mon, 17 Dec 2018 at 13:39, Sorin Fetche via Boost-users < boost-users@lists.boost.org> wrote:
Hi,
Is there a way to combine the special use_future completion token with a strand? Something with the meaning of: - the asynchronous operation should pass the result to the future it returns, and - the internal operations of it (if any) should run in a strand
Code snippet: asio::io_context io_context; asio::io_context::strand strand(io_context); std::future<void> f = async_my_operation(io_context, <params>, asio::use_future); //________________________________________How to add the strand here ^^^ ?
The code area where I would like to apply this is in this test program:
https://github.com/sorf/cpp-dev-new/blob/abf9d831a0b82fb81751eee6cfa498d3b98...
The self contained program and its output is here: https://wandbox.org/permlink/pF5Hbm6jqPOmEKbO
As a background, the test program I wrote is based on these Boost.Asio examples: - for strand usage (i.e. bind_executor): https://github.com/boostorg/asio/blob/develop/example/cpp03/tutorial/timer5/...
- for composed operations: https://github.com/boostorg/asio/blob/develop/example/cpp11/operations/compo...
and implements a composed operation that runs multiple internal operations in parallel and in series. Similar to the constructor of a socket or a timer object, the operation receives as a parameter an io_context; it doesn't offer an overload that receives a strand object directly.
The operation is then tested with callback completion, callback completion in a strand, future and future + strand (where the test fails).
Thank you, Sorin
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