[#mp_units-pi_c-0b]
= xref:mp_units.adoc[mp_units]::pi_c
:relfileprefix: ../
:mrdocs:

A convenient Magnitude constant for pi, which we can manipulate like a regular number.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
struct pi_c final
    : xref:mp_units/mag_constant.adoc[mag_constant<symbol_text<3UL ‐ 1, 3UL ‐ 1>{u8"\317\200", "pi"}, std::numbers::pi_v<long double>>]
----

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:mp_units/mag_constant.adoc[mag_constant<symbol_text<3UL ‐ 1, 3UL ‐ 1>{u8"\317\200", "pi"}, std::numbers::pi_v<long double>>]`
| A named Magnitude constant identified by its symbol and, where supported, its value
|===

== Static Data Members

[cols="1,4"]
|===
| Name| Description
| xref:mp_units/mag_constant/_symbol_.adoc[`_symbol_`] 
| The constant's textual symbol
| xref:mp_units/mag_constant/_value_.adoc[`_value_`] 
| The constant's numeric value
|===



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