[#llvm-parallelFor]
= xref:llvm.adoc[llvm]::parallelFor
:relfileprefix: ../
:mrdocs:

Invoke `Fn` for each index in []`Begin,` `End),` possibly in parallel.

== Synopsis

Declared in `<llvm/Support/Parallel.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
parallelFor(
    size_t Begin,
    size_t End,
    xref:llvm/function_ref-03.adoc[function_ref<void(size_t)>] Fn);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *Begin*
| First index to process.
| *End*
| One‐past‐last index to process.
| *Fn*
| Callable invoked with each index.
|===


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