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* Forgetting to provide `executor_type` and `get_executor` for the
* Forgetting to provide `executor_type` and `get_executor` for the
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* Calling a synchronous function by accident. In general composed
* Calling a synchronous function by accident. In general composed
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* Forgetting to include a return statement after calling an
* Forgetting to include a return statement after calling an
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* Type erasing the final handler. This will cause undefined behavior.
* Type erasing the final handler. This will cause undefined behavior.
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There are some common mistakes that should be avoided when writing composed operations:
There are some common mistakes that should be avoided when writing composed operations:
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The implementation strategy is to make the composed object meet the requirements of a completion handler by being movable, and by making it invocable so it can be used as a continuation for the asynchronous operations it launches. Rather than using `std::bind` or `boost::bind`, which destroys the type information and therefore breaks the associators, we will simply pass `std::move(*this)` as the completion handler parameter for any operations that we initiate. For the move to work correctly, care must be taken to ensure that no access to data members are made after the move takes place. Here is the complete implementation of our composed operation:
The implementation strategy is to make the composed object meet the requirements of a completion handler by being movable, and by making it invocable so it can be used as a continuation for the asynchronous operations it launches. Rather than using `std::bind` or `boost::bind`, which destroys the type information and therefore breaks the associators, we will simply pass `std::move(*this)` as the completion handler parameter for any operations that we initiate. For the move to work correctly, care must be taken to ensure that no access to data members are made after the move takes place. Here is the complete implementation of our composed operation:
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The initiating function contains a few relatively simple parts. There is the customization of the return value type, static type checking, building the return value type using the helper, and creating and launching the `echo_op` composed operation object.
The initiating function contains a few relatively simple parts. There is the customization of the return value type, static type checking, building the return value type using the helper, and creating and launching the `echo_op` composed operation object.
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Now that we have a declaration, we will define the body of the function. We want to achieve the following goals: perform static type checking on the input parameters, set up the return value as per __N3747__, and launch the composed operation by constructing an intermediate, stateful completion handler and invoking it.
Now that we have a declaration, we will define the body of the function. We want to achieve the following goals: perform static type checking on the input parameters, set up the return value as per __N3747__, and launch the composed operation by constructing an intermediate, stateful completion handler and invoking it.
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This example develops an initiating function called [*echo]. The operation will read up to the first newline on a stream, and then write the same line including the newline back on the stream. First we define the input parameters and results, then declare our initiation function. For our echo operation the only inputs are the stream and the completion token. The output is the error code which is usually included in all completion handler signatures.
This example develops an initiating function called [*echo]. The operation will read up to the first newline on a stream, and then write the same line including the newline back on the stream. First we define the input parameters and results, then declare our initiation function. For our echo operation the only inputs are the stream and the completion token. The output is the error code which is usually included in all completion handler signatures.
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Echo __example__
Echo __example__
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File “doc/qbk/01_intro/_intro_zh_Hans.qbk” was added. 06/05/2026
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Visit [@https://boost.org/libs/beast https://boost.org/libs/beast] for complete documentation.
Visit [@https://boost.org/libs/beast https://boost.org/libs/beast] for complete documentation.
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Documentation
Documentation
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Many thanks to [@https://www.jetbrains.com Jetbrains s.r.o.] for generously providing the Beast development team with All Product Developmnent Licenses.
Many thanks to [@https://www.jetbrains.com Jetbrains s.r.o.] for generously providing the Beast development team with All Product Developmnent Licenses.
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Thanks to [@https://github.com/madmongo1 Richard Hodges] (hodges.r@gmail.com) for maintaining Beast on behalf of the [@https://cppalliance.org C++ Alliance].
Thanks to [@https://github.com/madmongo1 Richard Hodges] (hodges.r@gmail.com) for maintaining Beast on behalf of the [@https://cppalliance.org C++ Alliance].
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Thanks to [@https://github.com/djarek Damian Jarek] for his generous participation and source code contributions.
Thanks to [@https://github.com/djarek Damian Jarek] for his generous participation and source code contributions.
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Beast would not be possible without the support of [@https://www.ripple.com Ripple] during the library's early development, or the ideas, time and patience contributed by [@https://github.com/JoelKatz David Schwartz], [@https://github.com/ximinez Edward Hennis], [@https://github.com/howardhinnant Howard Hinnant], [@https://github.com/miguelportilla Miguel Portilla], [@https://github.com/nbougalis Nik Bougalis], [@https://github.com/seelabs Scott Determan] and [@https://github.com/scottschurr Scott Schurr]. Many thanks to [@https://github.com/K-ballo Agustín Bergé], [@http://www.boost.org/users/people/glen_fernandes.html Glen Fernandes], and [@https://github.com/pdimov Peter Dimov] for tirelessly answering questions on the [@https://slack.cpp.al/ C++ Language Slack Workspace].
Beast would not be possible without the support of [@https://www.ripple.com Ripple] during the library's early development, or the ideas, time and patience contributed by [@https://github.com/JoelKatz David Schwartz], [@https://github.com/ximinez Edward Hennis], [@https://github.com/howardhinnant Howard Hinnant], [@https://github.com/miguelportilla Miguel Portilla], [@https://github.com/nbougalis Nik Bougalis], [@https://github.com/seelabs Scott Determan] and [@https://github.com/scottschurr Scott Schurr]. Many thanks to [@https://github.com/K-ballo Agustín Bergé], [@http://www.boost.org/users/people/glen_fernandes.html Glen Fernandes], and [@https://github.com/pdimov Peter Dimov] for tirelessly answering questions on the [@https://slack.cpp.al/ C++ Language Slack Workspace].
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Boost.Asio is the inspiration behind which all of the interfaces and implementation strategies are built. Some parts of the documentation are written to closely resemble the wording and presentation of Boost.Asio documentation. Credit goes to [@https://github.com/chriskohlhoff Christopher Kohlhoff] for his wonderful Asio library and the ideas in [@http://cplusplus.github.io/networking-ts/draft.pdf [*C++ Extensions for Networking]] which power Beast.
Boost.Asio is the inspiration behind which all of the interfaces and implementation strategies are built. Some parts of the documentation are written to closely resemble the wording and presentation of Boost.Asio documentation. Credit goes to [@https://github.com/chriskohlhoff Christopher Kohlhoff] for his wonderful Asio library and the ideas in [@http://cplusplus.github.io/networking-ts/draft.pdf [*C++ Extensions for Networking]] which power Beast.
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Credits
Credits
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To report bugs or get help using Beast, GitHub issues are preferred. Please visit [@https://github.com/boostorg/beast/issues https://github.com/boostorg/beast/issues] to ask a question, report a defect, or request a feature. If you prefer to keep your issue or question confidential please email the author at [@mailto:vinnie.falco%40gmail.com vinnie.falco@gmail.com].
To report bugs or get help using Beast, GitHub issues are preferred. Please visit [@https://github.com/boostorg/beast/issues https://github.com/boostorg/beast/issues] to ask a question, report a defect, or request a feature. If you prefer to keep your issue or question confidential please email the author at [@mailto:vinnie.falco%40gmail.com vinnie.falco@gmail.com].
06/05/2026

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