[#Descriptor-Expand]
= xref:Descriptor.adoc[Descriptor]::Expand
:relfileprefix: ../
:mrdocs:

Expand a descriptor at a specified position.

== Synopsis

Declared in `<script/descriptor.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
virtual
bool
Expand(
    int pos,
    xref:SigningProvider.adoc[SigningProvider] const& provider,
    std::vector<CScript>& output_scripts,
    xref:FlatSigningProvider.adoc[FlatSigningProvider]& out,
    xref:DescriptorCache.adoc[DescriptorCache]* write_cache = nullptr) const = 0;
----

== Return Value

True if the descriptor could be expanded at the position.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *pos* [in]
| The position at which to expand the descriptor. If IsRange() is false, this is ignored.
| *provider* [in]
| The provider to query for private keys in case of hardened derivation.
| *output_scripts* [out]
| The expanded scriptPubKeys.
| *out* [out]
| Scripts and public keys necessary for solving the expanded scriptPubKeys (may be equal to `provider`).
| *write_cache* [out]
| Cache data necessary to evaluate the descriptor at this point without access to private keys.
|===


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