[Merged by Bors] - Optimize .nth() and .last() for event iterators
#7530
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# Objective Related to #7530. `EventReader` iterators currently use the default impl for `.count()`, which unnecessarily loops over all unread events. # Solution Add specialized impls that mark the `EventReader` as consumed and return the number of unread events.
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# Objective Related to bevyengine#7530. `EventReader` iterators currently use the default impl for `.count()`, which unnecessarily loops over all unread events. # Solution Add specialized impls that mark the `EventReader` as consumed and return the number of unread events.
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# Objective Related to bevyengine#7530. `EventReader` iterators currently use the default impl for `.count()`, which unnecessarily loops over all unread events. # Solution Add specialized impls that mark the `EventReader` as consumed and return the number of unread events.
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# Objective Motivated by #7469. `EventReader` iterators use the default implementations for `.nth()` and `.last()`, which includes iterating over and throwing out all events before the desired one. ## Solution Add specialized implementations for these methods that directly updates the unread event counter and returns a reference to the desired event. TODO: - [x] Add a unit test. - [x] ~~Add a benchmark, to see if the compiler was doing this automatically already.~~ *On second thought, this doesn't feel like a very useful thing to include in the benchmark suite.*
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.nth() and .last() for event iterators.nth() and .last() for event iterators
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# Objective Motivated by bevyengine#7469. `EventReader` iterators use the default implementations for `.nth()` and `.last()`, which includes iterating over and throwing out all events before the desired one. ## Solution Add specialized implementations for these methods that directly updates the unread event counter and returns a reference to the desired event. TODO: - [x] Add a unit test. - [x] ~~Add a benchmark, to see if the compiler was doing this automatically already.~~ *On second thought, this doesn't feel like a very useful thing to include in the benchmark suite.*
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Objective
Motivated by #7469.
EventReaderiterators use the default implementations for.nth()and.last(), which includes iterating over and throwing out all events before the desired one.Solution
Add specialized implementations for these methods that directly updates the unread event counter and returns a reference to the desired event.
TODO:
Add a benchmark, to see if the compiler was doing this automatically already.On second thought, this doesn't feel like a very useful thing to include in the benchmark suite.