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[/
/ Copyright (c) 2003-2008 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:Service Service requirements]
A class is a service if it is publicly derived from another service, or if it
is a class derived from `io_service::service` and contains a
publicly-accessible declaration as follows:
static io_service::id id;
All services define a one-argument constructor that takes a reference to the
`io_service` object that owns the service. This constructor is /explicit/,
preventing its participation in automatic conversions. For example:
class my_service : public io_service::service
{
public:
static io_service::id id;
explicit my_service(io_service& ios);
private:
virtual void shutdown_service();
...
};
A service's `shutdown_service` member function must cause all copies of
user-defined handler objects that are held by the service to be destroyed.
[endsect]
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