[#BloombergLP-bslstl-IteratorUtil_LegacyInsertDistance-03-insertDistance]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::xref:BloombergLP/bslstl/IteratorUtil_LegacyInsertDistance-03.adoc[IteratorUtil_LegacyInsertDistance]::insertDistance
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Return the number of elements in the range `[first, last)]` if the (template parameter) type `t_SENTINEL` is convertible to the (template parameter) type `t_INPUT_ITERATOR` and `t_INPUT_ITERATOR` has a forward iterator category; otherwise return 0.

== Synopsis

Declared in `<bslstl_iteratorutil.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
bsl::iterator_traits<t_INPUT_ITERATOR>::difference_type
insertDistance(
    t_INPUT_ITERATOR const& first,
    t_SENTINEL const& last);
----


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