slist.hpp

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/* Copyright 1994-96, LongView Technologies L.L.C. $Revision: 1.7 $ */
/* Copyright (c) 2006, Sun Microsystems, Inc.
All rights reserved.

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    * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
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          disclaimer in the documentation and/or other materials provided with the distribution.
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          from this software without specific prior written permission.

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// Yet another version of lists, this one allowing efficient insert/delete in the middle.

# ifdef DELTA_COMPILER
  
class GenericSListElem : public ResourceObj  {
 protected:
  void* _data;
  GenericSListElem*  _next;
 public: 
  GenericSListElem(void* d, GenericSListElem* n = NULL) { _data = d; _next = n; }
  
  void* dataL() const                   { return this ? _data : NULL; }
  void setDataL(void* d)                { _data = d; }
  
  GenericSListElem* nextL() const       { return _next; }
  void setNextL(GenericSListElem* n)    { _next = n; }

 protected:
  void insertAfterL(void* d)            { _next = new GenericSListElem(d, _next); }
  
  friend class GenericSList;
};

typedef bool (*slistFindFn)(void* token, void* elem);

class GenericSList : public PrintableResourceObj {
 protected:
  GenericSListElem* _head;
  GenericSListElem* _tail;
  int _len;
 public:
  GenericSList() { _head = _tail = NULL; _len = 0; }
  
  void prependL(void* d) {
    _head = new GenericSListElem(d, _head);
    if (_tail == NULL) _tail = _head;
    _len++;
  }
  void appendL(void* d) {
    GenericSListElem* e = new GenericSListElem(d);
    if (_tail == NULL) {
      _head = _tail = e;
    } else {
      _tail->_next = e;
      _tail = e;
    }
    _len++;
  }
  
  GenericSListElem* headL() const               { return _head; }
  GenericSListElem* tailL() const               { return _tail; }
  
  void applyL(void f(void*));
  
  bool isEmpty() const                          { return _head == NULL; }
  bool nonEmpty() const                         { return ! isEmpty(); }
  int length() const                            { return _len; }
  bool includesL(void* p) const                 { return findL(p) != NULL; }
  GenericSListElem* findL(void* p) const;
  GenericSListElem* findL(void* p, slistFindFn f) const;
  
  void* nthL(int i) const;
  
  void* firstL() const                          { return headL()->dataL(); }
  void* secondL() const                         { return headL()->nextL()->dataL(); }
  void* lastL() const                           { return tailL()->dataL(); }
  
  void insertAfterL(GenericSListElem* e, void* d);
  void removeL(void* d);
  void removeAfterL(GenericSListElem* e);
  
 protected:
  void* removeHeadL() {
    assert(nonEmpty(), "removing from an empty list");
    void* d = firstL();
    _head = headL()->nextL();
    if (--_len == 0) _tail = _head;
    return d; }
  
 public:
  void pushL(void* d)                           { prependL(d); }
  void* popL()                                  { return removeHeadL(); }
  
  void print();
  void print_short();
};


template <class T> class SListElem : public GenericSListElem {
 public:
  SListElem(T d, SListElem<T>* n = NULL) : GenericSListElem((void*) d, (GenericSListElem*) n) {}                                      \

  T data() const                { return (T)GenericSListElem::dataL(); }
  void setData(T d)             { GenericSListElem::setDataL((void*) d); }
  SListElem<T>* next() const    { return (SListElem<T>*) GenericSListElem::nextL(); }
  void setNext(SListElem<T>* n) { GenericSListElem::setNextL(n); }
  void insertAfter(T d)         { GenericSListElem::insertAfterL((void*) d); }
};

template <class T> class SList : public GenericSList {
 public:
  SList() {}

  SListElem<T>* head() const    { return (SListElem<T>*) GenericSList::headL(); }
  SListElem<T>* tail() const    { return (SListElem<T>*) GenericSList::tailL(); }
  bool includes(T e) const      { return GenericSList::includesL((void*)e); } 
  SListElem<T>* find(T e) const { return (SListElem<T>*)GenericSList::findL((void*)e); }
  SListElem<T>* find(void* token, slistFindFn f) const {
                                  return (SListElem<T>*)GenericSList::findL(token, (slistFindFn)f); } 
                                                                            
  T first() const               { return (T) GenericSList::firstL(); }
  T second() const              { return (T) GenericSList::secondL(); }
  T at(int i) const             { return (T) GenericSList::nthL(i); }
  T last() const                { return (T) GenericSList::lastL(); }
                                                                            
  void prepend(T d)             { GenericSList::prependL((void*) d); }
  void append(T d)              { GenericSList::appendL((void*) d); }
  void apply(void f(T))         { GenericSList::applyL((void (*)(void*))f); }
  void insertAfter(SListElem<T>* e, T d) { GenericSList::insertAfterL((SListElem<T>*) e, (void*) d); }
  void removeAfter(SListElem<T>* e, T d) { GenericSList::removeAfterL((SListElem<T>*) e); }
  void remove(T d)              { GenericSList::removeL((void*) d); }
  T removeHead()                { return (T) GenericSList::removeHeadL(); }
  void push(T d)                { GenericSList::pushL((void*) d); }
  T pop()                       { return (T) GenericSList::popL(); }
  void apply(Closure<T>* c)     { 
    SListElem<T>* nexte;        // to permit removing during iteration
    for (SListElem<T>* e = head(); e; e = nexte) { nexte = e->next(); c->do_it(e->data()); }
  }
};

# endif

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