[#BloombergLP-bdlb-operator_minus-04]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::operator&hyphen;
:relfileprefix: ../../
:mrdocs:

Return the result of subtracting the underlying iterator of the specified `a` object from the underlying iterator of the specified `b` object&period; The behavior is undefined if this subtraction is undefined&period;

== Synopsis

Declared in `&lt;bdlb&lowbar;transformiterator&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template&lt;
    class FUNCTOR,
    class ITERATOR&gt;
bdlb::TransformIterator&lt;FUNCTOR, ITERATOR&gt;::difference&lowbar;type
operator&hyphen;(
    xref:BloombergLP/bdlb/TransformIterator.adoc[TransformIterator&lt;FUNCTOR, ITERATOR&gt;] const& a,
    xref:BloombergLP/bdlb/TransformIterator.adoc[TransformIterator&lt;FUNCTOR, ITERATOR&gt;] const& b);
----


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