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

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<std::size_t Idx>
inline constexpr static
xref:mp_units/QuantitySpec.adoc[QuantitySpec] auto axis = detail::nth_value<Idx, Axes...>();
----


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