[#CPartialMerkleTree-ExtractMatches]
= xref:CPartialMerkleTree.adoc[CPartialMerkleTree]::ExtractMatches
:relfileprefix: ../
:mrdocs:

extract the matching txid's represented by this partial merkle tree and their respective indices within the partial tree. returns the merkle root, or 0 in case of failure

== Synopsis

Declared in `<merkleblock.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:uint256.adoc[uint256]
ExtractMatches(
    std::vector<Txid>& vMatch,
    std::vector<unsigned int>& vnIndex);
----

== Return Value

The merkle root, or 0 in case of failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *vMatch*
| Output list of matched transaction ids.
| *vnIndex*
| Output list of the indices of the matched transactions within the tree.
|===


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