public static StateExpression<IData, IData[], IData> Create(IExpression arg, DataInteger lagOffset, IData argDefault)
{
//return new StateExpression<IData, Tuple<IData, IData>, IData>(
// (a) => new Tuple<IData, IData>(DataTypeUtil.GetDefaultFromDataType(arg.GetResultType()), a),
// delegate (Tuple<IData, IData> s, IData a) { s = new Tuple<IData, IData>(s.Item2, a); return s; },
// (s) => s.Item1,
// ConvertExpression.CreateData(arg)
// );
return new StateExpression<IData, IData[], IData>(
delegate (IData a)
{
var s = new IData[lagOffset + 1];
for (int i = 0; i < lagOffset; i++)
s[i] = argDefault;
s[lagOffset] = a;
return s;
},
delegate (IData[] s, IData a)
{
for (int i = 0; i < lagOffset; i++)
s[i] = s[i + 1];
s[lagOffset] = a;
return s;
},
(s) => s[0],
ConvertExpression.CreateData(arg)
);
}
public static StateExpression<IData, IData[], IData> Create(IExpression arg, DataInteger lagOffset)
{
return Create(arg, lagOffset, DataTypeUtil.GetDefaultFromDataType(arg.GetResultType()));
}
