Extract and publish reusable operator infrastructure - #794
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frankmcsherry merged 1 commit intoJul 13, 2026
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…al computation
Extracts from int_proxy the pieces whose correctness is a property of their
own inputs and outputs, so they can be used and tested in isolation:
* TimeHistory — replay times ascending with meet-of-remainder tracking and a
meet-advanced deduplicated buffer (a cheaper ValueHistory when only time
structure matters). ValueHistory itself was already shared (operators::)
and is re-exported here.
* discover_times — the times at which a key's reduction must be
re-evaluated, plus those to carry past 'upper'; O(times) peak memory.
Its one cross-call obligation (seeds from the novel batch's own support)
is stated at the signature.
* bilinear_wave — the join of two histories in time order, work bounded by
netted accumulation sizes rather than history lengths.
* tile_descriptions — cut an output interval into batch descriptions along
held capabilities.
int_proxy's tactics become expressions over these helpers, behaviorally
identical (its tests and oracles carry the equivalence). Written to host a
second tactic binding whose times are ranks into a caller-supplied store.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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The int-proxy introduced some regular patterns that have been useful for at least one other tactic, however the tools need to become public for this to work. These are still a bit specialized and function-fit, but as folks start to use them we can work on their shapes a bit more.