[#BloombergLP-bslalg-ArrayPrimitives-uninitializedFillN-0a]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslalg.adoc[bslalg]::xref:BloombergLP/bslalg/ArrayPrimitives.adoc[ArrayPrimitives]::uninitializedFillN
:relfileprefix: ../../../
:mrdocs:

Fill an uninitialized array with copies of a value.

== Synopsis

Declared in `<bslalg_arrayprimitives.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class ALLOCATOR>
static
void
uninitializedFillN(
    bsl::allocator_traits<ALLOCATOR>::pointer begin,
    xref:BloombergLP/bslalg/ArrayPrimitives/size_type.adoc[size_type] numElements,
    bsl::allocator_traits<ALLOCATOR>::value_type const& value,
    ALLOCATOR allocator);
----

== Description

Construct copies of the specified `value` of type given by the `allocator_traits` class template for (template parameter) `ALLOCATOR` into the uninitialized array containing the specified `numElements` starting at the specified `begin` location. The behavior is undefined unless the output array contains at least `numElements` uninitialized elements after `begin`. If a constructor throws an exception during the operation, then the destructor is called on any newly‐constructed elements, leaving the output array in an uninitialized state.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *begin*
| beginning of the uninitialized destination range
| *numElements*
| number of copies of `value` to construct
| *value*
| value copied into each constructed element
| *allocator*
| allocator used to supply memory if required
|===


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