[#mp_units-known_first_factor]
= xref:mp_units.adoc[mp_units]::known_first_factor
:relfileprefix: ../
:mrdocs:

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

== Synopsis

Declared in `<mp‐units/framework/unit_magnitude.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
template<intmax_t N>
constexpr std::optional<intmax_t> known_first_factor = std::nullopt;
----


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