[#MemPoolFeeRateEstimatorCache]
= MemPoolFeeRateEstimatorCache
:mrdocs:

MemPoolFeeRateEstimatorCache holds a cache of recent fee rate estimates. A cached fee rate is only provided while it is not older than CACHE_LIFE and the chain tip has not changed.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
class MemPoolFeeRateEstimatorCache;
----

== Types

[cols="1,4"]
|===
| Name| Description
| xref:MemPoolFeeRateEstimatorCache/FeeRateEstimate.adoc[`FeeRateEstimate`] 
| A pair of conservative and economical fee rate estimates.
|===


== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:MemPoolFeeRateEstimatorCache/2constructor-0b.adoc[`MemPoolFeeRateEstimatorCache`]         [.small]#[constructor]#
| Constructors
| xref:MemPoolFeeRateEstimatorCache/operator_assign.adoc[`operator=`]  [.small]#[deleted]#
| Deleted copy assignment; the cache is non‐copyable.
| xref:MemPoolFeeRateEstimatorCache/Clear.adoc[`Clear`] 
| Clear cached fee rate estimates.
| xref:MemPoolFeeRateEstimatorCache/GetCachedEstimate.adoc[`GetCachedEstimate`] 
| Returns cached estimates if not stale and computed on tip_hash, nullopt otherwise.
| xref:MemPoolFeeRateEstimatorCache/IsStale.adoc[`IsStale`] 
| Returns true if the cache is empty or older than CACHE_LIFE.
| xref:MemPoolFeeRateEstimatorCache/Update.adoc[`Update`] 
| Update the cache with new estimates computed on tip_hash.
|===



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