[#CCoinsView-GetHeadBlocks]
= xref:CCoinsView.adoc[CCoinsView]::GetHeadBlocks
:relfileprefix: ../
:mrdocs:

Retrieve the range of blocks that may have been only partially written. If the database is in a consistent state, the result is the empty vector. Otherwise, a two‐element vector is returned consisting of the new and the old block hash, in that order.

== Synopsis

Declared in `<coins.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
virtual
std::vector<uint256>
GetHeadBlocks() const = 0;
----

== Return Value

An empty vector when consistent, otherwise the new and old block hashes.


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