44 lines
2.0 KiB
Markdown
44 lines
2.0 KiB
Markdown
[exec.opstate.general]
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# 33 Execution control library [[exec]](./#exec)
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## 33.8 Operation states [[exec.opstate]](exec.opstate#general)
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### 33.8.1 General [exec.opstate.general]
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[1](#1)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/exec.tex#L1273)
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The [operation_state](#concept:operation_state "33.8.1 General [exec.opstate.general]") concept defines
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the requirements of an operation state type ([[exec.async.ops]](exec.async.ops "33.3 Asynchronous operations"))[.](#1.sentence-1)
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namespace std::execution {template<class O>concept [operation_state](#concept:operation_state "33.8.1 General [exec.opstate.general]") =[derived_from](concept.derived#concept:derived_from "18.4.3 Concept derived_from [concept.derived]")<typename O::operation_state_concept, operation_state_t> &&requires (O& o) { start(o); };}
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[2](#2)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/exec.tex#L1287)
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If an [operation_state](#concept:operation_state "33.8.1 General [exec.opstate.general]") object is destroyed
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during the lifetime of its asynchronous operation ([[exec.async.ops]](exec.async.ops "33.3 Asynchronous operations")),
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the behavior is undefined[.](#2.sentence-1)
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[*Note [1](#note-1)*:
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The [operation_state](#concept:operation_state "33.8.1 General [exec.opstate.general]") concept does not impose requirements
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on any operations other than destruction and start,
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including copy and move operations[.](#2.sentence-2)
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Invoking any such operation on an object
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whose type models [operation_state](#concept:operation_state "33.8.1 General [exec.opstate.general]") can lead to undefined behavior[.](#2.sentence-3)
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â *end note*]
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[3](#3)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/exec.tex#L1299)
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The program is ill-formed
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if it performs a copy or move construction or assignment operation on
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an operation state object created by connecting a library-provided sender[.](#3.sentence-1)
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