[#bsl-Pair_First-02-2constructor-0b]
= xref:bsl.adoc[bsl]::xref:bsl/Pair_First-02.adoc[Pair_First<TYPE&>]::Pair_First
:relfileprefix: ../../
:mrdocs:

Construct the `first` member of a `pair`, forwarding in order the elements in the specified `argsPack` to the corresponding constructor of (template parameter) `TYPE`. The length of the `argsPack` is equal to the length of the specified (template parameter pack) `I...` and passed to the constructor via the `Pair_IndexSequence` object.

== Synopsis

Declared in `<bslstl_pair.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class ARG>
constexpr
Pair_First(
    std::tuple<ARG>&& arg,
    xref:BloombergLP/bslstl/Pair_IndexSequence.adoc[BloombergLP::bslstl::Pair_IndexSequence<0U>]);
----


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