[#bsl-Pair_First-00-2constructor-0c9]
= xref:bsl.adoc[bsl]::xref:bsl/Pair_First-00.adoc[Pair&lowbar;First]::Pair&lowbar;First
:relfileprefix: ../../
:mrdocs:

Value&hyphen;initialize the &apos;first&apos; member of a &apos;pair&apos;&period; This constructor is declared only if (template parameter) `TYPE` is default constructible&period;

== Synopsis

Declared in `&lt;bslstl&lowbar;pair&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
Pair&lowbar;First()
requires std&colon;&colon;is&lowbar;default&lowbar;constructible&lowbar;v&lt;TYPE&gt;;
----


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