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< > BotCompany Repo | #1006726 // iteratorFromFunction - uses null to mark end of stream

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

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// f: func -> A (stream ends when f returns null)
static <A> IterableIterator<A> iteratorFromFunction(fO f) {
  class IFF extends IterableIterator<A> {
    A a;
    bool done;
    
    public bool hasNext() {
      getNext();
      ret !done;
    }
    
    public A next() {
      getNext();
      if (done) fail();
      A _a = a;
      a = null;
      ret _a;
    }
    
    void getNext() {
      if (done || a != null) ret;
      a = (A) callF(f);
      done = a == null;
    }
  };
  ret new IFF;
}

// optimized version for F0 argument
ifclass F0
static <A> IterableIterator<A> iteratorFromFunction(F0<A> f) {
  ret iteratorFromFunction_f0(f);
}
endif

static <A> IterableIterator<A> iteratorFromFunction(IF0<A> f) {
  ret iteratorFromFunction_if0(f);
}

Author comment

Began life as a copy of #1005525

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Snippet ID: #1006726
Snippet name: iteratorFromFunction - uses null to mark end of stream
Eternal ID of this version: #1006726/10
Text MD5: e89edc854bbc8f33b3de846a485709d6
Transpilation MD5: 32cef42f9ee9e52a84d41c3a0f13e169
Author: stefan
Category: javax
Type: JavaX fragment (include)
Public (visible to everyone): Yes
Archived (hidden from active list): No
Created/modified: 2021-07-11 15:56:21
Source code size: 797 bytes / 38 lines
Pitched / IR pitched: No / No
Views / Downloads: 400 / 480
Version history: 9 change(s)
Referenced in: [show references]