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lib/attrsets: add cartesianProductOfSets function

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Jacek Galowicz 2021-01-25 16:59:46 +01:00
parent d9353519d7
commit 123045a570
4 changed files with 125 additions and 2 deletions
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39
doc/functions/library/attrsets.xml
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@ -1711,4 +1711,43 @@ recursiveUpdate
</example>
</section>
<section xml:id="function-library-lib.attrsets.cartesianProductOfSets">
<title><function>lib.attrsets.cartesianProductOfSets</function></title>
<subtitle><literal>cartesianProductOfSets :: AttrSet -> [ AttrSet ]</literal>
</subtitle>
<xi:include href="./locations.xml" xpointer="lib.attrsets.cartesianProductOfSets" />
<para>
Return the cartesian product of attribute set value combinations.
</para>
<variablelist>
<varlistentry>
<term>
<varname>set</varname>
</term>
<listitem>
<para>
An attribute set with attributes that carry lists of values.
</para>
</listitem>
</varlistentry>
</variablelist>
<example xml:id="function-library-lib.attrsets.cartesianProductOfSets-example">
<title>Creating the cartesian product of a list of attribute values</title>
<programlisting><![CDATA[
cartesianProductOfSets { a = [ 1 2 ]; b = [ 10 20 ]; }
=> [
{ a = 1; b = 10; }
{ a = 1; b = 20; }
{ a = 2; b = 10; }
{ a = 2; b = 20; }
]
]]></programlisting>
</example>
</section>
</section>