[#bsl-select1st-operator_call]
= xref:bsl.adoc[bsl]::xref:bsl/select1st.adoc[select1st]::operator()
:relfileprefix: ../../
:mrdocs:

Return a reference to the `first` member of the specified `x`.

== Synopsis

Declared in `<bslstp_exfunctional.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
PAIR::first_type const&
operator()(PAIR const& x) const;
----


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