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-[/
- / Copyright (c) 2003-2016 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:ResolveHandler Resolve handler requirements]
-
-A resolve handler must meet the requirements for a [link asio.reference.Handler
-handler]. A value `h` of a resolve handler class should work correctly in the
-expression `h(ec, r)`, where `ec` is an lvalue of type `const error_code` and
-`r` is an lvalue of type `const ip::basic_resolver_results<InternetProtocol>`.
-`InternetProtocol` is the template parameter of the [link
-asio.reference.ip__basic_resolver `ip::basic_resolver<>`] which is used to
-initiate the asynchronous operation.
-
-[heading Examples]
-
-A free function as a resolve handler:
-
- void resolve_handler(
- const asio::error_code& ec,
- asio::ip::tcp::resolver::results_type results)
- {
- ...
- }
-
-A resolve handler function object:
-
- struct resolve_handler
- {
- ...
- void operator()(
- const asio::error_code& ec,
- asio::ip::tcp::resolver::results_type results)
- {
- ...
- }
- ...
- };
-
-A lambda as a resolve handler:
-
- resolver.async_resolve(...,
- [](const asio::error_code& ec,
- asio::ip::tcp::resolver::results_type results)
- {
- ...
- });
-
-A non-static class member function adapted to a resolve handler using
-`std::bind()`:
-
- void my_class::resolve_handler(
- const asio::error_code& ec,
- asio::ip::tcp::resolver::results_type results)
- {
- ...
- }
- ...
- resolver.async_resolve(...,
- std::bind(&my_class::resolve_handler,
- this, std::placeholders::_1,
- std::placeholders::_2));
-
-A non-static class member function adapted to a resolve handler using
-`boost::bind()`:
-
- void my_class::resolve_handler(
- const asio::error_code& ec,
- asio::ip::tcp::resolver::results_type results)
- {
- ...
- }
- ...
- resolver.async_resolve(...,
- boost::bind(&my_class::resolve_handler,
- this, asio::placeholders::error,
- asio::placeholders::results));
-
-[endsect]