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doc/go1.18: mention new x/exp generic packages

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Change-Id: I119cfb1a0da9af89ced78935b8fcdfdb8d9b4ab6
Reviewed-on: https://go-review.googlesource.com/c/go/+/383794
Trust: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
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Ian Lance Taylor 2022-02-07 10:02:30 -08:00
parent 3c4c10ea8c
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@ -90,6 +90,39 @@ Do not send CLs removing the interior tags from such phrases.
</li>
</ul>
<p>
There are three experimental packages using generics that may be
useful.
These packages are in x/exp repository; their API is not covered by
the Go 1 guarantee and may change as we gain more experience with
generics.
<dl>
<dt><a href="https://pkg.go.dev/golang.org/x/exp/constraints"><code>golang.org/x/exp/constraints</code></a></dt>
<dd>
<p>
Constraints that are useful for generic code, such as
<a href="https://pkg.go.dev/golang.org/x/exp/constraints#Ordered"><code>constraints.Ordered</code></a>.
</p>
</dd>
<dt><a href="https://pkg.go.dev/golang.org/x/exp/slices"><code>golang.org/x/exp/slices</code></a></dt>
<dd>
<p>
A collection of generic functions that operate on slices of
any element type.
</p>
</dd>
<dt><a href="https://pkg.go.dev/golang.org/x/exp/maps"><code>golang.org/x/exp/maps</code></a></dt>
<dd>
<p>
A collection of generic functions that operate on maps of
any key or element type.
</p>
</dd>
</dl>
</p>
<p>
The current generics implementation has the following limitations:
<ul>