123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657 |
- [/
- / Copyright (c) 2003-2019 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:AsyncRandomAccessWriteDevice Buffer-oriented asynchronous
- random-access write device requirements]
- In the table below, `a` denotes an asynchronous write stream object, `o`
- denotes an offset of type `boost::uint64_t`, `cb` denotes an object satisfying
- [link boost_asio.reference.ConstBufferSequence constant buffer sequence]
- requirements, and `h` denotes an object satisfying [link
- boost_asio.reference.WriteHandler write handler] requirements.
- [table Buffer-oriented asynchronous random-access write device requirements
- [[operation] [type] [semantics, pre/post-conditions]]
- [
- [`a.get_executor()`]
- [A type satisfying the [link boost_asio.reference.Executor1 Executor requirements].]
- [Returns the associated I/O executor.]
- ]
- [
- [`a.async_write_some_at(o, cb, h);`]
- [`void`]
- [
- Initiates an asynchronous operation to write one or more bytes of data to
- the device `a` at offset `o`. The operation is performed via the
- `io_service` object `a.get_io_service()` and behaves according to [link
- boost_asio.reference.asynchronous_operations asynchronous operation]
- requirements.\n
- \n
- The constant buffer sequence `cb` specifies memory where the data to be
- written is located. The `async_write_some_at` operation shall always
- write a buffer in the sequence completely before proceeding to the
- next.\n
- \n
- The implementation shall maintain one or more copies of `cb` until such
- time as the write operation no longer requires access to the memory
- specified by the buffers in the sequence. The program must ensure the
- memory is valid until:\n
- \n
- [mdash] the last copy of `cb` is destroyed, or\n
- \n
- [mdash] the handler for the asynchronous write operation is invoked,\n
- \n
- whichever comes first.\n
- \n
- If the total size of all buffers in the sequence `cb` is `0`, the
- asynchronous write operation shall complete immediately and pass `0` as
- the argument to the handler that specifies the number of bytes written.
- ]
- ]
- ]
- [endsect]
|