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- [/
- / 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:WriteHandler Write handler requirements]
- A write handler must meet the requirements for a [link
- boost_asio.reference.Handler handler]. A value `h` of a write handler class
- should work correctly in the expression `h(ec, s)`, where `ec` is an lvalue of
- type `const error_code` and `s` is an lvalue of type `const size_t`.
- [heading Examples]
- A free function as a write handler:
- void write_handler(
- const boost::system::error_code& ec,
- std::size_t bytes_transferred)
- {
- ...
- }
- A write handler function object:
- struct write_handler
- {
- ...
- void operator()(
- const boost::system::error_code& ec,
- std::size_t bytes_transferred)
- {
- ...
- }
- ...
- };
- A lambda as a write handler:
- socket.async_write(...
- [](const boost::system::error_code& ec,
- std::size_t bytes_transferred)
- {
- ...
- });
- A non-static class member function adapted to a write handler using
- `std::bind()`:
- void my_class::write_handler(
- const boost::system::error_code& ec,
- std::size_t bytes_transferred)
- {
- ...
- }
- ...
- socket.async_write(...,
- std::bind(&my_class::write_handler,
- this, std::placeholders::_1,
- std::placeholders::_2));
- A non-static class member function adapted to a write handler using
- `boost::bind()`:
- void my_class::write_handler(
- const boost::system::error_code& ec,
- std::size_t bytes_transferred)
- {
- ...
- }
- ...
- socket.async_write(...,
- boost::bind(&my_class::write_handler,
- this, boost::asio::placeholders::error,
- boost::asio::placeholders::bytes_transferred));
- [endsect]
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