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Present #213

merged 2 commits into from Sep 4, 2019


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commented Sep 4, 2019

This PR add a new difference type, Present, which is a zero-sized type indicating that the record is present. It supports settings like batch computation and some logic programs where facts are only ever introduced, and never retracted. The type has no zero, and addition and multiplication are the identity operations.

To use the type, it was important to generalize ThresholdTotal, in a way that I am not 100% satisfied with, but we can iterate on that.

cc @comnik


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commented Sep 4, 2019


@frankmcsherry frankmcsherry merged commit 589fe22 into master Sep 4, 2019

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