Created
June 20, 2011 13:30
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Duplicate or Clone example to have less calls
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| using System; | |
| class Program | |
| { | |
| static void Main(string[] args) | |
| { | |
| var c = new Curve(); | |
| var cc = c.Clone(); //cc is Curve | |
| var pc = new PolylineCurve(); | |
| var pcc = pc.Clone(); //pcc is PolylineCurve | |
| var pccl = ((ICloneable)pcc).Clone(); //pccl is PolylineCurve but typed object | |
| var lc = new LineCurve(); | |
| var lcc = lc.Clone(); //lcc is LineCurve | |
| PolylineCurve hc = new LineCurve(); | |
| var hcc = hc.Clone(); //hcc is LineCurve but typed PolylineCurve | |
| } | |
| } | |
| class Curve : ICloneable | |
| { | |
| protected virtual Curve DuplicateInternal() | |
| { | |
| return new Curve(); | |
| } | |
| public Curve Clone() //Clone, could also be called Duplicate | |
| { | |
| return DuplicateInternal(); | |
| } | |
| object ICloneable.Clone() //implicit interface implementation | |
| { | |
| return DuplicateInternal(); | |
| } | |
| } | |
| class PolylineCurve : Curve | |
| { | |
| protected override Curve DuplicateInternal() | |
| { | |
| return new PolylineCurve(); | |
| } | |
| public new PolylineCurve Clone() //hiding lower method, here to provide convenient return type | |
| { | |
| return (PolylineCurve)DuplicateInternal(); | |
| } | |
| } | |
| class LineCurve : PolylineCurve | |
| { | |
| protected override Curve DuplicateInternal() | |
| { | |
| return new LineCurve(); | |
| } | |
| public new LineCurve Clone() //same, hiding lower method for convenient return type | |
| { | |
| return (LineCurve)DuplicateInternal(); | |
| } | |
| } |
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