[#mp_units-operator_lshift-03]
= xref:mp_units.adoc[mp_units]::operator<<
:relfileprefix: ../
:mrdocs:

Stream insertion operator

== Synopsis

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

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

[NOTE]
====
This function is a https://en.cppreference.com/w/cpp/language/friend[hidden friend] of xref:mp_units/basic_fixed_string-08.adoc[basic_fixed_string], declared inside an implementation-defined base class: it can be found only through argument-dependent lookup.
====

== Return Value

Reference to the current output stream

== Parameters

[cols="1,4"]
|===
| Name| Description
| *os*
| An output stream
| *str*
| The object to output
|===


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