SkipCount.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. *
******************************************************************************/
namespace Leap.Unity.Query {
public struct SkipCountOp<SourceType, SourceOp> : IQueryOp<SourceType>
where SourceOp : IQueryOp<SourceType> {
private SourceOp _source;
private int _toSkip;
private int _skipLeft;
public SkipCountOp(SourceOp source, int toSkip) {
_source = source;
_toSkip = toSkip;
_skipLeft = _toSkip;
}
public bool TryGetNext(out SourceType t) {
while (true) {
if (!_source.TryGetNext(out t)) {
return false;
}
if (_skipLeft == 0) {
return true;
}
_skipLeft--;
}
}
public void Reset() {
_skipLeft = _toSkip;
_source.Reset();
}
}
public partial struct QueryWrapper<QueryType, QueryOp> where QueryOp : IQueryOp<QueryType> {
/// <summary>
/// Returns a new query operation representing the current query operation but without a
/// certain number of the elements at the start. This method is safe to call with a skip
/// amount that is larger than the number of elements in the sequence.
///
/// For example:
/// (A, B, C, D, E, F, G).Query().Skip(2)
/// Would result in:
/// (C, D, E, F, G)
/// </summary>
public QueryWrapper<QueryType, SkipCountOp<QueryType, QueryOp>> Skip(int toSkip) {
return new QueryWrapper<QueryType, SkipCountOp<QueryType, QueryOp>>(new SkipCountOp<QueryType, QueryOp>(_op, toSkip));
}
}
}