Zip.cs
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/******************************************************************************
* Copyright (C) Leap Motion, Inc. 2011-2017. *
* Leap Motion proprietary and confidential. *
* *
* Use subject to the terms of the Leap Motion SDK Agreement available at *
* https://developer.leapmotion.com/sdk_agreement, or another agreement *
* between Leap Motion and you, your company or other organization. *
******************************************************************************/
using System;
namespace Leap.Unity.Query {
public struct ZipOp<ResultType, SourceAType, SourceBType, SourceAOp, SourceBOp> : IQueryOp<ResultType>
where SourceAOp : IQueryOp<SourceAType>
where SourceBOp : IQueryOp<SourceBType> {
private SourceAOp _sourceA;
private SourceBOp _sourceB;
private Func<SourceAType, SourceBType, ResultType> _resultSelector;
public ZipOp(SourceAOp sourceA, SourceBOp sourceB, Func<SourceAType, SourceBType, ResultType> resultSelector) {
_sourceA = sourceA;
_sourceB = sourceB;
_resultSelector = resultSelector;
}
public bool TryGetNext(out ResultType t) {
SourceAType a;
SourceBType b;
if (_sourceA.TryGetNext(out a) && _sourceB.TryGetNext(out b)) {
t = _resultSelector(a, b);
return true;
} else {
t = default(ResultType);
return false;
}
}
public void Reset() {
_sourceA.Reset();
_sourceB.Reset();
}
}
public partial struct QueryWrapper<QueryType, QueryOp> where QueryOp : IQueryOp<QueryType> {
/// <summary>
/// Returns a new query operation that represents the combination of this query sequence with another
/// query sequence. The two sequences are combined element-by-element using a selector function.
/// The resulting sequence has a length equal to the smaller of the two sequences.
///
/// For example:
/// sequenceA = (A, B, C, D)
/// sequenceB = (E, F, G, H)
/// sequenceA.Query().Zip(sequenceB.Query(), (a, b) => a + b)
/// Would result in:
/// (AE, BF, CG, DH)
/// </summary>
public QueryWrapper<NewType, ZipOp<NewType, QueryType, OtherType, QueryOp, OtherOp>> Zip<NewType, OtherType, OtherOp>(QueryWrapper<OtherType, OtherOp> sourceB, Func<QueryType, OtherType, NewType> resultSelector)
where OtherOp : IQueryOp<OtherType> {
return new QueryWrapper<NewType, ZipOp<NewType, QueryType, OtherType, QueryOp, OtherOp>>(new ZipOp<NewType, QueryType, OtherType, QueryOp, OtherOp>(_op, sourceB._op, resultSelector));
}
}
}