20 General utilities library [utilities]

20.18 Execution policies [execpol]

20.18.5 Parallel execution policy [execpol.par]

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class execution::parallel_policy { unspecified };
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The class execution​::​parallel_­policy is an execution policy type used as a unique type to disambiguate parallel algorithm overloading and indicate that a parallel algorithm's execution may be parallelized.
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During the execution of a parallel algorithm with the execution​::​parallel_­policy policy, if the invocation of an element access function exits via an uncaught exception, terminate() is called.