tmp/tmpg67twsag/{from.md → to.md}
RENAMED
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#### General <a id="exec.adapt.general">[[exec.adapt.general]]</a>
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Subclause [[exec.adapt]] specifies a set of sender adaptors.
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The bitwise inclusive operator is overloaded for the purpose of creating
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sender chains. The adaptors also support function call syntax with
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equivalent semantics.
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Unless otherwise specified:
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- A sender adaptor is prohibited from causing observable effects, apart
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from moving and copying its arguments, before the returned sender is
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connected with a receiver using `connect`, and `start` is called on
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the resulting operation state.
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- A parent sender [[exec.async.ops]] with a single child sender `sndr`
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has an associated attribute object equal to `FWD-ENV(get_env(sndr))`
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[[exec.fwd.env]].
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- A parent sender with more than one child sender has an associated
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attributes object equal to `env<>{}`.
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- When a parent sender is connected to a receiver `rcvr`, any receiver
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used to connect a child sender has an associated environment equal to
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`FWD-ENV(get_env(rcvr))`.
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- An adaptor whose child senders are all non-dependent
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[[exec.async.ops]] is itself non-dependent.
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- These requirements apply to any function that is selected by the
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implementation of the sender adaptor.
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- *Recommended practice:* Implementations should use the completion
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signatures of the adaptors to communicate type errors to users and to
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propagate any such type errors from child senders.
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If a sender returned from a sender adaptor specified in [[exec.adapt]]
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is specified to include `set_error_t(Err)` among its set of completion
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signatures where `decay_t<Err>` denotes the type `exception_ptr`, but
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the implementation does not potentially evaluate an error completion
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operation with an `exception_ptr` argument, the implementation is
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allowed to omit the `exception_ptr` error completion signature from the
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set.
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