[#CExtKey-Derive]
= xref:CExtKey.adoc[CExtKey]::Derive
:relfileprefix: ../
:mrdocs:

Derive a BIP32 child extended key.

== Synopsis

Declared in `<key.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[nodiscard]]
bool
Derive(
    xref:CExtKey.adoc[CExtKey]& out,
    unsigned int nChild) const;
----

== Return Value

true if derivation succeeded.

[NOTE]
====
The return value https://en.cppreference.com/cpp/language/attributes/nodiscard[should not be discarded^].
====
== Parameters

[cols="1,4"]
|===
| Name| Description
| *out*
| Output child extended key.
| *nChild*
| Index of the child key to derive.
|===


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