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### General <a id="exec.snd.general">[[exec.snd.general]]</a>
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Subclauses [[exec.factories]] and [[exec.adapt]] define customizable
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algorithms that return senders. Each algorithm has a default
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implementation. Let `sndr` be the result of an invocation of such an
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algorithm or an object equal to the result [[concepts.equality]], and
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let `Sndr` be `decltype((sndr))`. Let `rcvr` be a receiver of type
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`Rcvr` with associated environment `env` of type `Env` such that
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`sender_to<Sndr, Rcvr>` is `true`. For the default implementation of the
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algorithm that produced `sndr`, connecting `sndr` to `rcvr` and starting
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the resulting operation state [[exec.async.ops]] necessarily results in
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the potential evaluation [[basic.def.odr]] of a set of completion
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operations whose first argument is a subexpression equal to `rcvr`. Let
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`Sigs` be a pack of completion signatures corresponding to this set of
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completion operations, and let `CS` be the type of the expression
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`get_completion_signatures<Sndr, Env>()`. Then `CS` is a specialization
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of the class template `completion_signatures` [[exec.cmplsig]], the set
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of whose template arguments is `Sigs`. If none of the types in `Sigs`
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are dependent on the type `Env`, then the expression
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`get_completion_signatures<Sndr>()` is well-formed and its type is `CS`.
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If a user-provided implementation of the algorithm that produced `sndr`
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is selected instead of the default:
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- Any completion signature that is in the set of types denoted by
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`completion_signatures_of_t<Sndr, Env>` and that is not part of `Sigs`
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shall correspond to error or stopped completion operations, unless
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otherwise specified.
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- If none of the types in `Sigs` are dependent on the type `Env`, then
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`completion_signatures_of_t<Sndr>` and
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`completion_signatures_of_t<Sndr, Env>` shall denote the same type.
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