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Make Orb use digraph hashes #687

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merged 2 commits into from
Aug 29, 2024
Merged

Make Orb use digraph hashes #687

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9762d43
Make Orb use digraph hashes.
reiniscirpons Aug 29, 2024
87b3ff5
Improve rank to fix issue when both Semigroups and Digraphs are loaded
reiniscirpons Aug 29, 2024
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11 changes: 11 additions & 0 deletions gap/attr.gi
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Original file line number Diff line number Diff line change
Expand Up @@ -750,13 +750,24 @@ function(D)
return out;
end);

# Hash related attributes

InstallMethod(DigraphHash, "for a digraph", [IsDigraph], DIGRAPH_HASH);

# To make built in Orbit function use DigraphHash
InstallMethod(SparseIntKey, "for an object and digraph",
[IsObject, IsDigraph],
{coll, D} -> DigraphHash
);

# To make orb package use DigraphHash
InstallMethod(ChooseHashFunction, "for a digraph and positive integer",
[IsDigraph, IsInt],
2,
{D, hashlen} -> rec(func := {x, data} -> 1 + (DigraphHash(x) mod data[1]),
data := [hashlen])
);

# attributes for digraphs . . .

InstallMethod(AsGraph, "for a digraph", [IsDigraph], Graph);
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