[#BloombergLP-bslalg-ArrayPrimitives-emplace-02]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslalg.adoc[bslalg]::xref:BloombergLP/bslalg/ArrayPrimitives.adoc[ArrayPrimitives]::emplace
:relfileprefix: ../../../
:mrdocs:

Emplace a newly constructed element, shifting subsequent elements.

== Synopsis

Declared in `<bslalg_arrayprimitives.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class ALLOCATOR,
    class... ARGS>
static
void
emplace(
    bsl::allocator_traits<ALLOCATOR>::pointer toBegin,
    bsl::allocator_traits<ALLOCATOR>::pointer toEnd,
    ALLOCATOR allocator,
    ARGS&&... arguments);
----

== Description

Insert a newly created `allocator_traits<ALLOCATOR>::value_type` object, constructed by forwarding the specified `allocator` (if required) and the specified (variable number of) `arguments` to the corresponding constructor of `allocator_traits<ALLOCATOR>::value_type`, into the array at the specified `toBegin` location, shifting forward the elements from `toBegin` to the specified `toEnd` location by one position. If an exception is thrown during the in‐place construction of the new object, the elements in the range `[toBegin .. toEnd)]` are unaffected; otherwise, if a (copy or move) constructor or a (copy or move) assignment operator throws an exception, then any elements created after `toEnd` are destroyed and the elements in the range `[toBegin .. toEnd )]` are left in a valid but unspecified state. The behavior is undefined unless `toBegin` refers to sufficient space to hold at least `toEnd ‐ toBegin + 1` elements.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *toBegin*
| insertion position within the destination array
| *toEnd*
| end of the populated destination range
| *allocator*
| allocator used to supply memory if required
| *arguments*
| constructor arguments forwarded to the new element
|===


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