[#mp_units-conditional]
= xref:mp_units.adoc[mp&lowbar;units]::conditional
:relfileprefix: ../
:mrdocs:

== Synopsis

Declared in `&lt;mp&hyphen;units&sol;ext&sol;type&lowbar;traits&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template&lt;
    bool B,
    typename T,
    typename F&gt;
using conditional = &sol;&ast; implementation-defined &ast;&sol;::type&lt;T, F&gt;;
----


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