[#BloombergLP-bdlb-TransformIterator-operator_plus_eq]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::xref:BloombergLP/bdlb/TransformIterator.adoc[TransformIterator]::operator+=
:relfileprefix: ../../../
:mrdocs:

Advance the underlying iterator of this object by the specified (signed) `offset`, and return a reference providing modifiable access to this object. The behavior is undefined if so advancing the underlying iterator is undefined.

== Synopsis

Declared in `<bdlb_transformiterator.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BloombergLP/bdlb/TransformIterator.adoc[TransformIterator<FUNCTOR, ITERATOR>]&
operator+=(xref:BloombergLP/bdlb/TransformIterator/difference_type.adoc[difference_type] offset);
----


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