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[helpers] Add "unknown" value handling to `Deduplicator` (#9855)

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Keith Burzinski 2025-07-23 21:22:54 -05:00 committed by GitHub
parent 5cd7f156b9
commit a3e626757e
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1 changed files with 12 additions and 5 deletions
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17
esphome/core/helpers.h
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@ -578,21 +578,28 @@ template<typename... Ts> class CallbackManager<void(Ts...)> {
/// Helper class to deduplicate items in a series of values.
template<typename T> class Deduplicator {
public:
/// Feeds the next item in the series to the deduplicator and returns whether this is a duplicate.
/// Feeds the next item in the series to the deduplicator and returns false if this is a duplicate.
bool next(T value) {
if (this->has_value_) {
if (this->last_value_ == value)
return false;
if (this->has_value_ && !this->value_unknown_ && this->last_value_ == value) {
return false;
}
this->has_value_ = true;
this->value_unknown_ = false;
this->last_value_ = value;
return true;
}
/// Returns whether this deduplicator has processed any items so far.
/// Returns true if the deduplicator's value was previously known.
bool next_unknown() {
bool ret = !this->value_unknown_;
this->value_unknown_ = true;
return ret;
}
/// Returns true if this deduplicator has processed any items.
bool has_value() const { return this->has_value_; }
protected:
bool has_value_{false};
bool value_unknown_{false};
T last_value_{};
};