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The '''Parallel Patterns Library''' is a [[Microsoft]] library designed for use by native C++ developers that provides features for [[multicore programming]].<ref>{{cite web | url = http://paper.li/visualc/news/2011/03/12 | title = The Visual C++ Weekly | date = March 12, 2011 | access-date = August 14, 2011 | archive-url = https://web.archive.org/web/20111008024206/http://paper.li/visualc/news/2011/03/12 | archive-date = October 8, 2011 | url-status = dead }}</ref> It was first bundled with [[Visual Studio 2010]]. It resembles the [[C++ Standard Library]] in style and works well with the C++11 language feature, lambdas, also introduced with [[Visual Studio 2010]].

For example, this sequential loop:
<syntaxhighlight lang="cpp">
for (int x=0; x < width; ++x)
{
// Something parallelizable
}
</syntaxhighlight>

Can be made into a parallel loop by replacing the for with a <code>parallel_for</code>:
<syntaxhighlight lang="cpp">
#include <ppl.h>
// . . .
Concurrency::parallel_for (0, width, [=](int x)
{
// Something parallelizable
});
</syntaxhighlight>

This still requires the developer to know that the loop is parallelizable, but all the other work is done by the library.

MSDN<ref>{{cite web | url = http://msdn.microsoft.com/en-us/library/dd492418.aspx | title = Parallel Patterns Library (PPL) on MSDN | date = 3 August 2021 }} </ref> describes the Parallel Patterns Library as an "imperative programming model that promotes scalability and ease-of-use for developing concurrent applications." It uses the Concurrency Runtime for scheduling and resource management and provides generic, type-safe algorithms and containers for use in parallel applications.

==References==
{{reflist}}

{{Compu-stub}}
[[Category:Concurrent programming libraries]]
[[Category:C++ libraries]]
[[Category:Threads (computing)]]

Parallel Patterns Library - Revision history

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