26 Algorithms library [algorithms]

The class unsequenced_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 vectorized, e.g., executed on a single thread using instructions that operate on multiple data items.

During the execution of a parallel algorithm with the execution​::​unsequenced_policy policy, if the invocation of an element access function exits via an exception, terminate is invoked ([except.terminate]).