33 Execution control library [exec]

33.5 Queries [exec.queries]

33.5.10 execution​::​get_await_completion_adaptor [exec.get.await.adapt]

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get_await_completion_adaptor asks a queryable object for its associated awaitable completion adaptor.
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The name get_await_completion_adaptor denotes a query object.
For a subexpression env, get_await_completion_adaptor(env) is expression-equivalent to MANDATE-NOTHROW(AS-CONST(env).query(get_await_completion_adaptor))
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forwarding_query(execution​::​get_await_completion_adaptor) is a core constant expression and has value true.