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Adds one signature under a key of the caller's choosing.

public void Add(string key, ReadOnlySpan<uint> signature)

Parameters — key is what Query returns when this signature is a candidate. signature is at least Banding.Permutations long.

Exceptions — ArgumentNullException when key is null; ArgumentException when the signature is too short, or the key is already held.

Example — the shape a caller writes.

using Lodestar.Text.Similarity;

var index = new LshIndex(new LshBanding(1, 2));
index.Add("first", [5u, 5u]);
index.Add("second", [5u, 5u]);

int held = index.Count;  // => 2

Remarks — a key may be added once. Adding it twice throws rather than replacing, because the signature is already scattered across the bands it landed in and a silent replace would leave the old one findable. Removing and re-adding is not offered: an index that has to change is cheaper to rebuild than to unpick.

Count tracks keys, not buckets — one signature occupies Banding.Bands buckets and still counts once.

Applies to — net10.0, netstandard2.0.

See also — LshIndex.Query.