35 lines
1.3 KiB
Plaintext
35 lines
1.3 KiB
Plaintext
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/ Copyright (c) 2003-2023 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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/
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/ Distributed under the Boost Software License, Version 1.0. (See accompanying
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/ file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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/]
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[section:OperationState Operation state concept]
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template<class O>
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concept operation_state =
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destructible<O> &&
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is_object_v<O> &&
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requires (O& o) {
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{ execution::start(o) } noexcept;
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};
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An object whose type satisfies `operation_state` represents the state of an
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asynchronous operation. It is the result of calling `execution::connect` with a
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`sender` and a `receiver`.
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`execution::start` may be called on an `operation_state` object at most once.
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Once `execution::start` has been invoked, the caller shall ensure that the
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start of a non-exceptional invocation of one of the receiver's
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completion-signalling operations strongly happens before [intro.multithread]
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the call to the `operation_state` destructor.
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The start of the invocation of `execution::start` shall strongly happen before
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[intro.multithread] the invocation of one of the three receiver operations.
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`execution::start` may or may not block pending the successful transfer of
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execution to one of the three receiver operations.
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[endsect]
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