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[/
/ Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff 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:SyncReadStream Buffer-oriented synchronous read stream requirements]
A type `X` meets the `SyncReadStream` requirements if it satisfies the
requirements listed below.
In the table below, `a` denotes a value of type `X`, `mb` denotes a (possibly
const) value satisfying the [link boost_asio.reference.MutableBufferSequence
`MutableBufferSequence`] requirements, and `ec` denotes an object of type
`error_code`.
[table SyncReadStream requirements
[[operation] [type] [semantics, pre/post-conditions]]
[
[`a.read_some(mb)`[br]
`a.read_some(mb,ec)`]
[`size_t`]
[
Meets the requirements for a [link boost_asio.reference.read_write_operations
read operation].[br]
[br]
If `buffer_size(mb) > 0`, reads one or more bytes of data from the stream
`a` into the buffer sequence `mb`. If successful, sets `ec` such that
`!ec` is `true`, and returns the number of bytes read. If an error
occurred, sets `ec` such that `!!ec` is `true`, and returns 0. If all
data has been read from the stream, and the stream performed an orderly
shutdown, sets `ec` to `stream_errc::eof` and returns 0.[br]
[br]
If `buffer_size(mb) == 0`, the operation shall not block. Sets `ec` such
that `!ec` is `true`, and returns 0.
]
]
]
[endsect]
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