[#KeyPathElement-ChildNumber]
= xref:KeyPathElement.adoc[KeyPathElement]::ChildNumber
:relfileprefix: ../
:mrdocs:

Derivation index with the hardened flag applied&period;

== Synopsis

Declared in `&lt;util&sol;bip32&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
uint32&lowbar;t
ChildNumber() const;
----

== Return Value

The child number, with the hardened flag set when the element is hardened&period;


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