38 lines
1.2 KiB
Markdown
38 lines
1.2 KiB
Markdown
[exec.get.stop.token]
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# 33 Execution control library [[exec]](./#exec)
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## 33.5 Queries [[exec.queries]](exec.queries#exec.get.stop.token)
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### 33.5.3 get_stop_token [exec.get.stop.token]
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[1](#1)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/exec.tex#L881)
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get_stop_token asks a queryable object for an associated stop token[.](#1.sentence-1)
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[2](#2)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/exec.tex#L884)
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The name get_stop_token denotes a query object[.](#2.sentence-1)
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For a subexpression env,get_stop_token(env) is expression-equivalent to:
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- [(2.1)](#2.1)
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*MANDATE-NOTHROW*(*AS-CONST*(env).query(get_stop_token)) if that expression is well-formed[.](#2.1.sentence-1)
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*Mandates*: The type of the expression above satisfies [stoppable_token](stoptoken.concepts#concept:stoppable_token "32.3.3 Stop token concepts [stoptoken.concepts]")[.](#2.1.sentence-2)
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- [(2.2)](#2.2)
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Otherwise, never_stop_token{}[.](#2.2.sentence-1)
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[3](#3)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/exec.tex#L900)
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forwarding_query(get_stop_token) is a core constant expression and
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has value true[.](#3.sentence-1)
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