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The `value_type` nested type allows the body to define the declaration of the body type as it appears in the message. This can be any type. For example, a body's value type may specify `std::vector<char>` or `std::list<std::string>`. A custom body may even set the value type to something that is not a container for body octets, such as a [@boost:/libs/filesystem/doc/reference.html#class-path `boost::filesystem::path`]. Or, a more structured container may be chosen. This declares a body's value type as a JSON tree structure produced from a [@boost:/doc/html/json/input_output.html#json.input_output.parsing.streaming_parser `boost::json::stream_parser`]: ``` #include <boost/json/stream_parser.hpp>
The `value_type` nested type allows the body to define the declaration of the body type as it appears in the message. This can be any type. For example, a body's value type may specify `std::vector<char>` or `std::list<std::string>`. A custom body may even set the value type to something that is not a container for body octets, such as a [@boost:/libs/filesystem/doc/reference.html#class-path `boost::filesystem::path`]. Or, a more structured container may be chosen. This declares a body's value type as a JSON tree structure produced from a [@boost:/doc/html/json/input_output.html#json.input_output.parsing.streaming_parser `boost::json::stream_parser`]: ``` #include <boost/json/stream_parser.hpp>
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Value Type
Value Type
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An optional nested type meeting the requirements of __BodyWriter__, which provides the algorithm for converting the body representation to a forward range of buffer sequences. If present this body type may be used with a __serializer__.
An optional nested type meeting the requirements of __BodyWriter__, which provides the algorithm for converting the body representation to a forward range of buffer sequences. If present this body type may be used with a __serializer__.
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`writer`
`writer`
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An optional nested type meeting the requirements of __BodyReader__, which provides the algorithm for storing a forward range of buffer sequences in the body representation. If present, this body type may be used with a __parser__.
An optional nested type meeting the requirements of __BodyReader__, which provides the algorithm for storing a forward range of buffer sequences in the body representation. If present, this body type may be used with a __parser__.
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`reader`
`reader`
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Determines the type of the [link beast.ref.boost__beast__http__message.body `message::body`] member.
Determines the type of the [link beast.ref.boost__beast__http__message.body `message::body`] member.
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`value_type`
`value_type`
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Description
Description
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Name
Name
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Body Type Members
Body Type Members
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The meaning of the nested types is as follows
The meaning of the nested types is as follows
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} ```
} ```
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User-defined types are possible for the message body, where the type meets the __Body__ requirements. This simplified class declaration shows the customization points available to user-defined body types: ``` /// Defines a Body type struct body {
User-defined types are possible for the message body, where the type meets the __Body__ requirements. This simplified class declaration shows the customization points available to user-defined body types: ``` /// Defines a Body type struct body {
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Custom Body Types
Custom Body Types
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File “doc/qbk/06_websocket/07_teardown_zh_Hans.qbk” was added. 06/05/2026
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To invoke the customization point, first bring the default implementation into scope with a `using` statement. Then call the customization point without namespace qualification, allowing argument-dependent lookup to take effect:
To invoke the customization point, first bring the default implementation into scope with a `using` statement. Then call the customization point without namespace qualification, allowing argument-dependent lookup to take effect:
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Invoking Teardown
Invoking Teardown
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When the implementation invokes the asynchronous teardown function, it always uses an invokable completion handler. It is not necessary to specify the return type customization when creating user-defined overloads of `async_teardown`.
When the implementation invokes the asynchronous teardown function, it always uses an invokable completion handler. It is not necessary to specify the return type customization when creating user-defined overloads of `async_teardown`.
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To provide overloads of teardown for a user-defined type, simply declare the two free functions with the correct signature, accepting a reference to the user-defined type as the stream parameter:
To provide overloads of teardown for a user-defined type, simply declare the two free functions with the correct signature, accepting a reference to the user-defined type as the stream parameter:
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