ParallelForEachBody

[req.parallel_for_each_body]

A type Body satisfies ParallelForEachBody if it meets the Function Objects requirements described in the [function.objects] section of the ISO C++ standard, as well as meets exactly one of the following two alternative requirements for operator():

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ParallelForEachBody Requirements: Pseudo-Signature, Semantics

Alternative 1:

void Body::operator()(ReferenceType item) const

Process the received item.

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Alternative 2:

void Body::operator()(ReferenceType item, oneapi::tbb::feeder<ItemType> &feeder) const

void Body::operator()(ItemType &&item, oneapi::tbb::feeder<ItemType> &feeder) const

Process the received item. May invoke the feeder.add function to spawn additional items. The Body::operator() must accept both ReferenceType and ItemType&& values as the first argument.

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where

• ItemType is std::iterator_traits<Iterator>::value_type for the type of the iterator the parallel_for_each algorithm operates with, and

• ReferenceType is std::iterator_traits<Iterator>::reference if the iterator type is a forward iterator as described in the [forward.iterators] section of the ISO C++ Standard,

• otherwise, ReferenceType is ItemType&&.

Note

The usual rules for pseudo-signatures apply. Therefore, Body::operator() may optionally take items by value or by const reference.

See also:

• parallel_for_each algorithm

• feeder class