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Code Issues Releases Wiki Activity

Optimize stateless lambdas to use function pointers (#11551)

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This commit is contained in:
J. Nick Koston
2025-10-27 14:06:22 -05:00
committed by GitHub
parent 7394cbf773
commit 3c18558003
12 changed files with 190 additions and 11 deletions
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3
esphome/components/binary_sensor/__init__.py
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@@ -155,6 +155,7 @@ DelayedOffFilter = binary_sensor_ns.class_("DelayedOffFilter", Filter, cg.Compon
InvertFilter = binary_sensor_ns.class_("InvertFilter", Filter)
AutorepeatFilter = binary_sensor_ns.class_("AutorepeatFilter", Filter, cg.Component)
LambdaFilter = binary_sensor_ns.class_("LambdaFilter", Filter)
StatelessLambdaFilter = binary_sensor_ns.class_("StatelessLambdaFilter", Filter)
SettleFilter = binary_sensor_ns.class_("SettleFilter", Filter, cg.Component)
_LOGGER = getLogger(__name__)
@@ -299,7 +300,7 @@ async def lambda_filter_to_code(config, filter_id):
lambda_ = await cg.process_lambda(
config, [(bool, "x")], return_type=cg.optional.template(bool)
)
return cg.new_Pvariable(filter_id, lambda_)
return automation.new_lambda_pvariable(filter_id, lambda_, StatelessLambdaFilter)
@register_filter(

15
esphome/components/binary_sensor/filter.h
View File

@@ -111,6 +111,21 @@ class LambdaFilter : public Filter {
std::function<optional<bool>(bool)> f_;
};
/** Optimized lambda filter for stateless lambdas (no capture).
*
* Uses function pointer instead of std::function to reduce memory overhead.
* Memory: 4 bytes (function pointer on 32-bit) vs 32 bytes (std::function).
*/
class StatelessLambdaFilter : public Filter {
public:
explicit StatelessLambdaFilter(optional<bool> (*f)(bool)) : f_(f) {}
optional<bool> new_value(bool value) override { return this->f_(value); }
protected:
optional<bool> (*f_)(bool);
};
class SettleFilter : public Filter, public Component {
public:
optional<bool> new_value(bool value) override;