[#index_util-LookUpOne]
= xref:index_util.adoc[index_util]::LookUpOne
:relfileprefix: ../
:mrdocs:

Look up a single index entry for a block, trying the height index then the hash index.

== Synopsis

Declared in `<index/db_key.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<typename DBVal>
static
bool
LookUpOne(
    xref:CDBWrapper.adoc[CDBWrapper] const& db,
    xref:interfaces/BlockRef.adoc[interfaces::BlockRef] const& block,
    DBVal& result);
----

== Return Value

True if an entry for the block was found.

== Template Parameters

[cols="1,4"]
|===
| Name| Description
| *DBVal*
| Type of the value stored for the entry.
|===

== Parameters

[cols="1,4"]
|===
| Name| Description
| *db*
| Database to read from.
| *block*
| Reference identifying the block to look up.
| *result*
| Set to the value that was found.
|===


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