[#MemPoolFeeRateEstimatorCache-IsStale]
= xref:MemPoolFeeRateEstimatorCache.adoc[MemPoolFeeRateEstimatorCache]::IsStale
:relfileprefix: ../
:mrdocs:

Returns true if the cache is empty or older than CACHE&lowbar;LIFE&period;

== Synopsis

Declared in `&lt;policy&sol;fees&sol;mempool&lowbar;estimator&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
IsStale() const;
----

== Return Value

true if the cache holds no estimate or the stored estimate has expired&period;


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