ImmutableListWalker [1030669]

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

// the walker is immutable, meaning the only way to
// advance the pointer is to make a new walker object
static persistable class ImmutableListWalker<A> {
  L<A> list;
  int index;
  
  *(L<A> *list) {}
  *(L<A> *list, int *index) {}
  
  bool has() { ret index >= 0 && index < l(list); }
  
  A get() {
    ret _get(list, index);
  }
  
  ImmutableListWalker<A> next() {
    ret new ImmutableListWalker(list, index+1);
  }
  
  bool atEnd() {
    ret index >= l(list);
  }
}

Author comment

Began life as a copy of #1030668

Travelled to 4 computer(s): bhatertpkbcr, mqqgnosmbjvj, pyentgdyhuwx, vouqrxazstgt

Snippet ID:

#1030669

Snippet name:

ImmutableListWalker

Eternal ID of this version:

#1030669/5

Text MD5:

8fa98dff46cbc5bd2ab7a2ff7d06ebd5

Transpilation MD5:

5824510264452a13f28e2b8aaa8d15e0

Author:

stefan

Category:

javax

Type:

JavaX fragment (include)

Public (visible to everyone):

Yes

Archived (hidden from active list):

Created/modified:

2021-02-26 11:27:23

Source code size:

498 bytes / 23 lines

Pitched / IR pitched:

No / No

Views / Downloads:

540 / 795

Version history:

4 change(s)

Referenced in:

[show references]

1	// the walker is immutable, meaning the only way to
2	// advance the pointer is to make a new walker object
3	static persistable class ImmutableListWalker<A> {
4	L<A> list;
5	int index;
6
7	(L<A> list) {}
8	(L<A> list, int *index) {}
9
10	bool has() { ret index >= 0 && index < l(list); }
11
12	A get() {
13	ret _get(list, index);
14	}
15
16	ImmutableListWalker<A> next() {
17	ret new ImmutableListWalker(list, index+1);
18	}
19
20	bool atEnd() {
21	ret index >= l(list);
22	}
23	}