Extensions for parallelism
The C++ Extensions for Parallelism, ISO/IEC TS 19570:2015 defines the following new components for the C++ standard library:
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[edit] Execution policies
The parallelism TS describes three execution policies: sequential, parallel, and parallel+vector, and provides corresponding execution policy types and objects. Users may select an execution policy statically by invoking a parallel algorithm with the an execution policy object of the corresponding type, or dynamically by using the type-erasing execution_policy class.
Implementations may define additional execution policies as an extension. The semantics of parallel algorithms invoked with an execution policy object of implementation-defined type is implementation-defined.
| Defined in header
<experimental/execution_policy> |
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| execution policy types (class) |
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| global execution policy objects (constant) |
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| dynamic execution policy (class) |
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| test whether a class represents an execution policy (class template) |
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[edit] Exception lists
| Defined in header
<experimental/exception_list> |
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| exceptions raised during parallel executions (class) |
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[edit] Parallelized versions of existing algorithms
The TS provides parallelized versions of the following 69 algorithms from <algorithm>, <numeric> and <memory>:
[edit] New algorithms
| Defined in header
<experimental/algorithm> |
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| similar to std::for_each except returns void (function template) |
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| applies a function object to the first n elements of a sequence (function template) |
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| Defined in header
<experimental/numeric> |
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| (parallelism TS)
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similar to std::accumulate, except out of order (function template) |
| similar to std::partial_sum, excludes the ith input element from the ith sum (function template) |
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| similar to std::partial_sum, includes the ith input element in the ith sum (function template) |
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| (parallelism TS)
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applies a functor, then reduces out of order (function template) |
| applies a functor, then calculates exclusive scan (function template) |
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| applies a functor, then calculates inclusive scan (function template) |
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