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rippled/doc/types/Reader.qbk
Vinnie Falco d8dea963fa Squashed 'src/beast/' changes from 1b9a714..6d5547a
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2017-04-20 13:40:52 -07:00

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[/
Copyright (c) 2013-2017 Vinnie Falco (vinnie dot falco at gmail dot com)
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
]
[section:Reader Reader requirements]
Parsers provided by the implementation will construct the corresponding
`reader` object during parsing. This customization point allows the
Body to determine the strategy for storing incoming message body data.
In this table:
* `X` denotes a type meeting the requirements of [*`Reader`].
* `a` denotes a value of type `X`.
* `n` is a value convertible to `std::size_t`.
* `p` is a `void const*` to valid memory of at least `n` bytes.
* `ec` is a value of type [link beast.ref.error_code `error_code&`].
* `m` denotes a value of type `message&` where
`std::is_same<decltype(m.body), Body::value_type>::value == true`.
[table Reader requirements
[[operation] [type] [semantics, pre/post-conditions]]
[
[`X a(m);`]
[]
[
`a` is constructible from `m`. The lifetime of `m` is guaranteed
to end no earlier than after `a` is destroyed. The constructor
will be called after all headers have been stored in `m`, and
before any body data is deserialized. This function must be
`noexcept`.
]
]
[
[`a.init(ec)`]
[`void`]
[
Called immediately after construction. If the function sets
an error code in `ec`, the parse is aborted and the error is
propagated to the caller. This function must be `noexcept`.
]
]
[
[`a.write(p, n, ec)`]
[`void`]
[
Deserializes the input sequence into the body. If `ec` is set,
the deserialization is aborted and the error is propagated to
the caller. If the message headers specify a chunked transfer
encoding, the reader will receive the decoded version of the
body. This function must be `noexcept`.
]
]
]
[note
Definitions for required `Reader` member functions should be declared
inline so the generated code can become part of the implementation.
]
[endsect]