iteratorFromFunction_withEndMarker [1012670]

// requires ugly casting when used (O -> A)
static O iteratorFromFunction_endMarker = new O;

// f: func -> A | endMarker
static <A> IterableIterator<A> iteratorFromFunction_withEndMarker(fO f) {
  class IFF extends IterableIterator<A> {
    A a;
    bool have, done;
    
    public bool hasNext() {
      getNext();
      ret !done;
    }
    
    public A next() {
      getNext();
      if (done) fail();
      A _a = a;
      a = null;
      have = false;
      ret _a;
    }
    
    void getNext() {
      if (done || have) ret;
      O o = callF(f);
      if (o == iteratorFromFunction_endMarker)
        ret with done = true;
      a = (A) o;
      set have;
    }
  };
  ret new IFF;
}

// optimized version for F0 argument; TODO: do same for IF0
static <A> IterableIterator<A> iteratorFromFunction_withEndMarker(final F0 f) {
  ret iteratorFromFunction_withEndMarker_f0(f);
}

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Snippet ID:	#1012670
Snippet name:	iteratorFromFunction_withEndMarker
Eternal ID of this version:	#1012670/10
Text MD5:	079337852ad4d61ae8fa3b4d6eb9313d
Transpilation MD5:	1170bda7f0684a651bc5e269ea15291d
Author:	stefan
Category:	javax
Type:	JavaX fragment (include)
Public (visible to everyone):	Yes
Archived (hidden from active list):	No
Created/modified:	2019-10-28 11:47:45
Source code size:	924 bytes / 39 lines
Pitched / IR pitched:	No / No
Views / Downloads:	468 / 1050
Version history:	9 change(s)
Referenced in:	[show references]

< > BotCompany Repo | #1012670 // iteratorFromFunction_withEndMarker

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

Author comment

1	// requires ugly casting when used (O -> A)
2	static O iteratorFromFunction_endMarker = new O;
3
4	// f: func -> A \| endMarker
5	static <A> IterableIterator<A> iteratorFromFunction_withEndMarker(fO f) {
6	class IFF extends IterableIterator<A> {
7	A a;
8	bool have, done;
9
10	public bool hasNext() {
11	getNext();
12	ret !done;
13	}
14
15	public A next() {
16	getNext();
17	if (done) fail();
18	A _a = a;
19	a = null;
20	have = false;
21	ret _a;
22	}
23
24	void getNext() {
25	if (done \|\| have) ret;
26	O o = callF(f);
27	if (o == iteratorFromFunction_endMarker)
28	ret with done = true;
29	a = (A) o;
30	set have;
31	}
32	};
33	ret new IFF;
34	}
35
36	// optimized version for F0 argument; TODO: do same for IF0
37	static <A> IterableIterator<A> iteratorFromFunction_withEndMarker(final F0 f) {
38	ret iteratorFromFunction_withEndMarker_f0(f);
39	}