[#AbstractThresholdConditionChecker]
= AbstractThresholdConditionChecker
:mrdocs:

Abstract class that implements BIP9‐style threshold logic, and caches results.

== Synopsis

Declared in `<versionbits_impl.h>`

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

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:AbstractThresholdConditionChecker/2destructor.adoc[`~AbstractThresholdConditionChecker`] [.small]#[destructor]# [.small]#[virtual]#
| Defaulted virtual destructor.
| xref:AbstractThresholdConditionChecker/GetStateFor.adoc[`GetStateFor`] 
| Returns the state for pindex A based on parent pindexPrev B. Applies any state transition if conditions are present. Caches state from first block of period.
| xref:AbstractThresholdConditionChecker/GetStateSinceHeightFor.adoc[`GetStateSinceHeightFor`] 
| Returns the height since when the ThresholdState has started for pindex A based on parent pindexPrev B, all blocks of a period share the same
| xref:AbstractThresholdConditionChecker/GetStateStatisticsFor.adoc[`GetStateStatisticsFor`] 
| Returns the numerical statistics of an in‐progress BIP9 softfork in the period including pindex If provided, signalling_blocks is set to true/false based on whether each block in the period signalled
|===


== Protected Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:AbstractThresholdConditionChecker/BeginTime.adoc[`BeginTime`]  [.small]#[virtual]#
| Returns the timestamp at which the deployment may start.
| xref:AbstractThresholdConditionChecker/Condition.adoc[`Condition`]  [.small]#[virtual]#
| Returns whether the deployment's condition is met for a block.
| xref:AbstractThresholdConditionChecker/EndTime.adoc[`EndTime`]  [.small]#[virtual]#
| Returns the timestamp at which the deployment times out.
| xref:AbstractThresholdConditionChecker/MinActivationHeight.adoc[`MinActivationHeight`]  [.small]#[virtual]#
| Returns the earliest height at which the deployment may activate.
| xref:AbstractThresholdConditionChecker/Period.adoc[`Period`]  [.small]#[virtual]#
| Returns the number of blocks in a retarget period.
| xref:AbstractThresholdConditionChecker/Threshold.adoc[`Threshold`]  [.small]#[virtual]#
| Returns the number of signalling blocks required for lock‐in.
|===


== Derived Classes

[cols="1,4"]
|===
| Name| Description
| xref:VersionBitsConditionChecker.adoc[`VersionBitsConditionChecker`] 
| Class to implement versionbits logic.
|===


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