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

Returns true if the cache is empty or older than CACHE_LIFE.

== Synopsis

Declared in `<policy/fees/mempool_estimator.h>`

[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.


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