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

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

== Synopsis

Declared in `<bdlb_transformiterator.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class FUNCTOR,
    class ITERATOR>
bdlb::TransformIterator<FUNCTOR, ITERATOR>::difference_type
operator‐(
    xref:BloombergLP/bdlb/TransformIterator.adoc[TransformIterator<FUNCTOR, ITERATOR>] const& a,
    xref:BloombergLP/bdlb/TransformIterator.adoc[TransformIterator<FUNCTOR, ITERATOR>] const& b);
----


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