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* [link beast.ref.boost__beast__http__basic_dynamic_body.writer `basic_dynamic_body::writer`]
* [link beast.ref.boost__beast__http__basic_file_body__writer `basic_file_body::writer`]
* [link beast.ref.boost__beast__http__basic_string_body.writer `basic_string_body::writer`]
* [link beast.ref.boost__beast__http__buffer_body.writer `buffer_body::writer`]
* [link beast.ref.boost__beast__http__empty_body.writer `empty_body::writer`]
* [link beast.ref.boost__beast__http__span_body.writer `span_body::writer`]
* [link beast.ref.boost__beast__http__vector_body.writer `vector_body::writer`]
* [link beast.ref.boost__beast__http__basic_dynamic_body.writer `basic_dynamic_body::writer`]
* [link beast.ref.boost__beast__http__basic_file_body__writer `basic_file_body::writer`]
* [link beast.ref.boost__beast__http__basic_string_body.writer `basic_string_body::writer`]
* [link beast.ref.boost__beast__http__buffer_body.writer `buffer_body::writer`]
* [link beast.ref.boost__beast__http__empty_body.writer `empty_body::writer`]
* [link beast.ref.boost__beast__http__span_body.writer `span_body::writer`]
* [link beast.ref.boost__beast__http__vector_body.writer `vector_body::writer`]
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Models
Models
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Exemplar
Exemplar
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Called one or more times after `init` succeeds. This function returns `boost::none` if all buffers representing the body have been returned in previous calls or if it sets `ec` to indicate an error. Otherwise, if there are buffers remaining the function should return a pair with the first element containing a non-zero length buffer sequence representing the next set of octets in the body, while the second element is a `bool` meaning `true` if there may be additional buffers returned on a subsequent call, or `false` if the buffer returned on this call is the last buffer representing the body. The function will ensure that `!ec` is `true` if there was no error or set to the appropriate error code if there was one.
Called one or more times after `init` succeeds. This function returns `boost::none` if all buffers representing the body have been returned in previous calls or if it sets `ec` to indicate an error. Otherwise, if there are buffers remaining the function should return a pair with the first element containing a non-zero length buffer sequence representing the next set of octets in the body, while the second element is a `bool` meaning `true` if there may be additional buffers returned on a subsequent call, or `false` if the buffer returned on this call is the last buffer representing the body. The function will ensure that `!ec` is `true` if there was no error or set to the appropriate error code if there was one.
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`W<W::const_buffers_type>`
`W<W::const_buffers_type>`
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`a.get(ec)`
`a.get(ec)`
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Called once to fully initialize the object before any calls to `get`. The message body becomes valid before entering this function, and remains valid until the writer is destroyed. The function will ensure that `!ec` is `true` if there was no error or set to the appropriate error code if there was one.
Called once to fully initialize the object before any calls to `get`. The message body becomes valid before entering this function, and remains valid until the writer is destroyed. The function will ensure that `!ec` is `true` if there was no error or set to the appropriate error code if there was one.
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`a.init(ec)`
`a.init(ec)`
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Constructible from `h` and `v`. The lifetime of `h` and `v` are guaranteed to end no earlier than after the `W` is destroyed. The writer shall not access the contents of `h` or `v` before the first call to `init`, permitting lazy construction of the message.

The constructor may optionally require that `h` and `v` are `const` references, with these consequences:

* If `W` requires that `h` and `v` are const references, then the corresponding serializer constructors for messages with this body type will will accept a const reference to a message, otherwise:

* If `W` requires that `h` and `v` are non-const references, then the corresponding serializer constructors for messages with this body type will require a non-const reference to a message.
Constructible from `h` and `v`. The lifetime of `h` and `v` are guaranteed to end no earlier than after the `W` is destroyed. The writer shall not access the contents of `h` or `v` before the first call to `init`, permitting lazy construction of the message.

The constructor may optionally require that `h` and `v` are `const` references, with these consequences:

* If `W` requires that `h` and `v` are const references, then the corresponding serializer constructors for messages with this body type will will accept a const reference to a message, otherwise:

* If `W` requires that `h` and `v` are non-const references, then the corresponding serializer constructors for messages with this body type will require a non-const reference to a message.
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`W{h,v};`
`W{h,v};`
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A type which meets the requirements of __ConstBufferSequence__. This is the type of buffer returned by `W::get`.
A type which meets the requirements of __ConstBufferSequence__. This is the type of buffer returned by `W::get`.
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`W::const_buffers_type`
`W::const_buffers_type`
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Semantics, Pre/Post-conditions
Semantics, Pre/Post-conditions
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Type
Type
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Expression
Expression
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Valid expressions
Valid expressions
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* `a` denotes a value of type `W`.
* `h` denotes a const value of type `header<isRequest, Fields> const&`.
* `v` denotes a possibly const value of type `Body::value_type&`.
* `ec` is a value of type [link beast.ref.boost__beast__error_code `error_code&`].
* `W<T>` is the type `boost::optional<std::pair<T, bool>>`.
* `a` denotes a value of type `W`.
* `h` denotes a const value of type `header<isRequest, Fields> const&`.
* `v` denotes a possibly const value of type `Body::value_type&`.
* `ec` is a value of type [link beast.ref.boost__beast__error_code `error_code&`].
* `W<T>` is the type `boost::optional<std::pair<T, bool>>`.
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* `W` denotes a type meeting the requirements of [*BodyWriter].
* `B` denotes a __Body__ where
* `W` denotes a type meeting the requirements of [*BodyWriter].
* `B` denotes a __Body__ where
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In this table:
In this table:
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These requirements may undergo non-backward compatible
These requirements may undergo non-backward compatible
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