[#CChain-operator_subs]
= xref:CChain.adoc[CChain]::operator[]
:relfileprefix: ../
:mrdocs:

Returns the index entry at a particular height in this chain, or nullptr if no such height exists.

== Synopsis

Declared in `<chain.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:CBlockIndex.adoc[CBlockIndex]*
operator[](int nHeight) const;
----

== Return Value

The block index entry at the given height, or nullptr if out of range.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *nHeight*
| The height to look up.
|===


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