Mercurial > hg > Database > jungle-sharp

comparison Main/jungle-main/util/DefaultEither.cs @ 33:56de71ae6f7e

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Implementation of fmap.
author Kazuma Takeda
date Sat, 28 Jan 2017 19:12:18 +0900
parents 1f99e150f336
children a79781723862
comparison
equal deleted inserted replaced
32:07318c10b894 33:56de71ae6f7e
1  1 
2 public class DefaultEither<A,B> : Either<A,B> { 2 public class DefaultEither<A,B> : Either<A,B> {
3 private A theA; 3 private A theA;
4 private B theB; 4 private B theB;
5 5
6 private DefaultEither(A _theA, B _theB){ 6 public void SetB (B b) {
7 this.theB = b;
8 }
9
10 public void SetA (A a) {
11 this.theA = a;
12 }
13
14 public delegate B Func (B b);
15
16 public DefaultEither(A _theA, B _theB){
7 theA = _theA; 17 theA = _theA;
8 theB = _theB; 18 theB = _theB;
9 } 19 }
10 20
11 public static DefaultEither<A,B> newA(A _theA) 21 public static DefaultEither<A,B> newA(A _theA)
39 public bool isB() 49 public bool isB()
40 { 50 {
41 return theB != null; 51 return theB != null;
42 } 52 }
43 53
54 public Either<A, B> fmap(System.Func<B, B> f, Either<A,B> e) {
55 if (e.isA ()) {
56 return e;
57 }
58 this.SetB (f (e.b()));
59 return this;
60 }
61
44 } 62 }