[#ChainstateManager-BlocksAheadOfTip]
= xref:ChainstateManager.adoc[ChainstateManager]::BlocksAheadOfTip
:relfileprefix: ../
:mrdocs:

Returns how many blocks the best header is ahead of the current tip, or nullopt if the best header does not extend the tip&period;

== Synopsis

Declared in `&lt;validation&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
&lsqb;&lsqb;locks&lowbar;excluded(0x7f2e1bc183b8), locks&lowbar;excluded(0x7f2e146b6708), locks&lowbar;excluded(0x7f2e298fbad8), locks&lowbar;excluded(0x7f2e360b9238)&rsqb;&rsqb;
std::optional&lt;int&gt;
BlocksAheadOfTip() const;
----

== Return Value

The number of blocks the best header is ahead of the tip, or std&colon;&colon;nullopt&period;


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