[#mp_units-operator_lshift-0d0]
= xref:mp_units.adoc[mp_units]::operator<<
:relfileprefix: ../
:mrdocs:

Streams the textual symbol of a dimension to a `std::basic_ostream`.

== Synopses

Declared in `<mp‐units/ext/fixed_string.h>`

Streams the textual symbol of a dimension to a `std::basic_ostream`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    typename CharT,
    typename Traits,
    xref:mp_units/Unit.adoc[Unit] D>
std::basic_ostream<CharT, Traits>&
xref:mp_units/operator_lshift-02.adoc[operator<<](
    std::basic_ostream<CharT, Traits>& os,
    D d);
----

[.small]#xref:mp_units/operator_lshift-02.adoc[_» more..._]#

Stream insertion operator


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    typename CharT,
    std::size_t N>
std::basic_ostream<CharT>&
xref:mp_units/operator_lshift-03.adoc[operator<<](
    std::basic_ostream<CharT>& os,
    xref:mp_units/basic_fixed_string-08.adoc[basic_fixed_string<CharT, N>] const& str);
----

[.small]#xref:mp_units/operator_lshift-03.adoc[_» more..._]#

Stream insertion operator


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    typename CharT,
    typename Traits,
    auto R,
    typename Rep>
std::basic_ostream<CharT, Traits>&
xref:mp_units/operator_lshift-0c.adoc[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); };
----

[.small]#xref:mp_units/operator_lshift-0c.adoc[_» more..._]#

Stream insertion operator


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    typename CharT,
    typename Traits,
    auto R,
    auto PO,
    typename Rep>
requires (PO == default_point_origin(R))
std::basic_ostream<CharT, Traits>&
xref:mp_units/operator_lshift-0d9.adoc[operator<<](
    std::basic_ostream<CharT, Traits>& os,
    xref:mp_units/quantity_point-08.adoc[quantity_point<R, PO, Rep>] const& qp)
requires requires { os << qp.quantity_from_zero(); };
----

[.small]#xref:mp_units/operator_lshift-0d9.adoc[_» more..._]#

== Return Value

`os`

== Parameters

[cols="1,4"]
|===
| Name| Description
| *os*
| the output stream to write to
| *d*
| the dimension to render
|===


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