Either - union type [1009173]

< > BotCompany Repo | #1009173 // Either - union type

JavaX fragment (include) [tags: use-pretranspiled]

sclass Either<A, B> {
  byte which;
  O value;
  
  *() {}
  *(int which, O *value) { this.which = (byte) which; }
  
  bool isA() { ret which == 1; }
  bool isB() { ret which == 2; }
  
  A a() { if (which != 1) _failMe(); ret (A) value; }
  B b() { if (which != 2) _failMe(); ret (B) value; }
  
  A aOpt() { ret which != 1 ? null : (A) value; }
  B bOpt() { ret which != 2 ? null : (B) value; }
  
  void _failMe {
    fail("Either object is of wrong type: " + shortClassName(value));
  }
  
  toString {
    ret "Either" + (isA() ? "A" : "B") + "(" + value + ")";
  }
}

Author comment

Began life as a copy of #1009167

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Snippet ID:

#1009173

Snippet name:

Either - union type

Eternal ID of this version:

#1009173/3

Text MD5:

9fe255a383c894d06d431159ee6ebf71

Transpilation MD5:

3b2204f04af8fcb13d98ffd1f28985e7

Author:

stefan

Category:

javax

Type:

JavaX fragment (include)

Public (visible to everyone):

Yes

Archived (hidden from active list):

Created/modified:

2020-05-23 17:15:47

Source code size:

596 bytes / 24 lines

Pitched / IR pitched:

No / No

Views / Downloads:

1003 / 4703

Version history:

2 change(s)

Referenced in:

[show references]

1	sclass Either<A, B> {
2	byte which;
3	O value;
4
5	*() {}
6	(int which, O value) { this.which = (byte) which; }
7
8	bool isA() { ret which == 1; }
9	bool isB() { ret which == 2; }
10
11	A a() { if (which != 1) _failMe(); ret (A) value; }
12	B b() { if (which != 2) _failMe(); ret (B) value; }
13
14	A aOpt() { ret which != 1 ? null : (A) value; }
15	B bOpt() { ret which != 2 ? null : (B) value; }
16
17	void _failMe {
18	fail("Either object is of wrong type: " + shortClassName(value));
19	}
20
21	toString {
22	ret "Either" + (isA() ? "A" : "B") + "(" + value + ")";
23	}
24	}