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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:Service Service requirements]
-
-A class is a ['service] if it is publicly and unambiguously derived from
-`execution_context::service`, or if it is publicly and unambiguously derived
-from another service. For a service `S`, `S::key_type` shall be valid and
-denote a type (C++Std [temp.deduct]), `is_base_of_v<typename S::key_type, S>`
-shall be `true`, and `S` shall satisfy the `Destructible` requirements (C++Std
-[destructible]).
-
-The first parameter of all service constructors shall be an lvalue reference to
-`execution_context`. This parameter denotes the `execution_context` object that
-represents a set of services, of which the service object will be a member.
-[inline_note These constructors may be called by the `make_service` function.]
-
-A service shall provide an explicit constructor with a single parameter of
-lvalue reference to `execution_context`. [inline_note This constructor may be
-called by the `use_service` function.]
-
- class my_service : public execution_context::service
- {
- public:
- typedef my_service key_type;
- explicit my_service(execution_context& ctx);
- my_service(execution_context& ctx, int some_value);
- private:
- virtual void shutdown() noexcept override;
- ...
- };
-
-A service's `shutdown` member function shall destroy all copies of user-defined
-function objects that are held by the service.
-
-[endsect]