[#bsl-Pair_First-09-2constructor-0b0]
= xref:bsl.adoc[bsl]::xref:bsl/Pair_First-09.adoc[Pair_First<TYPE&&>]::Pair_First
:relfileprefix: ../../
:mrdocs:

Constructors

== Synopses

Declared in `<bslstl_pair.h>`

Bind `first` to the entity bound to `other.first`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/Pair_First-09/2constructor-03.adoc[Pair_First](xref:bsl/Pair_First-09.adoc[Pair_First] const& other) = default;
----

[.small]#xref:bsl/Pair_First-09/2constructor-03.adoc[_» more..._]#

Bind `first` to the entity bound to `other.first`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/Pair_First-09/2constructor-04.adoc[Pair_First](xref:bsl/Pair_First-09.adoc[Pair_First]&& other) = default;
----

[.small]#xref:bsl/Pair_First-09/2constructor-04.adoc[_» more..._]#

Bind the specified `value` into the `first` reference‐member.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
explicit
xref:bsl/Pair_First-09/2constructor-02.adoc[Pair_First](TYPE&& value);
----

[.small]#xref:bsl/Pair_First-09/2constructor-02.adoc[_» more..._]#

Bind the specified `value` into the `first` reference‐member.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class PARAM,
    class = void>
requires std::is_constructible<TYPE, PARAM>::value
constexpr
explicit
xref:bsl/Pair_First-09/2constructor-0b4.adoc[Pair_First](PARAM&& value);
----

[.small]#xref:bsl/Pair_First-09/2constructor-0b4.adoc[_» more..._]#

Construct the `first` member from the single element of `arg`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class ARG>
constexpr
xref:bsl/Pair_First-09/2constructor-0e.adoc[Pair_First](
    std::tuple<ARG>&& arg,
    xref:BloombergLP/bslstl/Pair_IndexSequence.adoc[BloombergLP::bslstl::Pair_IndexSequence<0U>] indices);
----

[.small]#xref:bsl/Pair_First-09/2constructor-0e.adoc[_» more..._]#

Bind `value` into `first`; the allocator argument is not used.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class PARAM>
constexpr
xref:bsl/Pair_First-09/2constructor-01.adoc[Pair_First](
    PARAM&& value,
    xref:BloombergLP/bslma/Allocator.adoc[BloombergLP::bslma::Allocator]* basicAllocator,
    xref:bsl/Pair_BslmaIdiomNone.adoc[Pair_BslmaIdiomNone] idiom);
----

[.small]#xref:bsl/Pair_First-09/2constructor-01.adoc[_» more..._]#

== Parameters

[cols="1,4"]
|===
| Name| Description
| *other*
| object whose `first` reference is copied
| *value*
| entity to bind into the `first` reference‐member
| *arg*
| single‐element tuple forwarded to the constructor of `TYPE`
| *indices*
| index sequence enumerating the elements of `arg`
| *basicAllocator*
| allocator argument, which is not used
| *idiom*
| tag selecting the no‐allocator construction idiom
|===


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