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

Derivation index with the hardened flag applied.

== Synopsis

Declared in `<util/bip32.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
uint32_t
ChildNumber() const;
----

== Return Value

The child number, with the hardened flag set when the element is hardened.


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