[#node-IteratorComparator-operator_call]
= xref:node.adoc[node]::xref:node/IteratorComparator.adoc[IteratorComparator]::operator()
:relfileprefix: ../../
:mrdocs:

Order two map iterators by their key.

== Synopsis

Declared in `<node/mini_miner.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<typename I>
bool
operator()(
    I const& a,
    I const& b) const;
----

== Return Value

True if the key of `a` orders before the key of `b.`

== Parameters

[cols="1,4"]
|===
| Name| Description
| *a*
| The first iterator to compare.
| *b*
| The second iterator to compare.
|===


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