Parallelizing an Index-Based for-Loop

Learn how to build a parallel_for() algorithm by combining std::for_each() with std::views::iota(), and how to execute algorithms on GPUs.

Even though we recommend using algorithms, sometimes a raw, index-based for-loop is required for a specific task. The standard library algorithms provide an equivalent of a range-based for-loop by including the algorithm std::for_each() in the library.

However, there is no algorithm equivalent of an index-based for-loop. In other words, we cannot easily parallelize code like this by simply adding a parallel policy to it:

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