[#btck_block_tree_entry_get_previous]
= btck_block_tree_entry_get_previous
:mrdocs:

Returns the previous block tree entry in the tree, or null if the current block tree entry is the genesis block.

== Synopsis

Declared in `<kernel/bitcoinkernel.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[__nonnull__]]
xref:btck_BlockTreeEntry-0c.adoc[btck_BlockTreeEntry] const*
btck_block_tree_entry_get_previous(xref:btck_BlockTreeEntry-0c.adoc[btck_BlockTreeEntry] const* block_tree_entry);
----

== Return Value

The previous block tree entry, or null on error or if the current block tree entry is the genesis block.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *block_tree_entry* [in]
| Non‐null.
|===


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