[#mp_units-operator_lshift-0e0]
= xref:mp_units.adoc[mp_units]::operator<<
:relfileprefix: ../
:mrdocs:

Stream insertion operator

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    typename CharT,
    typename Traits,
    auto R,
    typename Rep>
std::basic_ostream<CharT, Traits>&
operator<<(
    std::basic_ostream<CharT, Traits>& os,
    xref:mp_units/quantity-01.adoc[quantity<R, Rep>] const& q)
requires requires { os << q.numerical_value_ref_in(q.unit); };
----

== Return Value

Reference to the current output stream

== Parameters

[cols=2]
|===
| Name
| Description
| *os*
| An output stream
| *q*
| The object to output
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#