CLIST Class Reference

#include <clst.h>

Public Member Functions
	CLIST ()
	~CLIST ()
void	internal_deep_clear (void(*zapper)(void *))
void	shallow_clear ()
bool	empty () const
bool	singleton () const
void	shallow_copy (CLIST *from_list)
void	assign_to_sublist (CLIST_ITERATOR *start_it, CLIST_ITERATOR *end_it)
inT32	length () const
void	sort (int comparator(const void *, const void *))
bool	add_sorted (int comparator(const void *, const void *), bool unique, void *new_data)
void	set_subtract (int comparator(const void *, const void *), bool unique, CLIST *minuend, CLIST *subtrahend)

Friends
class	CLIST_ITERATOR

Detailed Description

Definition at line 70 of file clst.h.

Constructor & Destructor Documentation

CLIST()

CLIST::CLIST ( )

inline

Definition at line 81 of file clst.h.

            {  //constructor
      last = NULL;
    }

~CLIST()

CLIST::~CLIST ( )

inline

Definition at line 85 of file clst.h.

              {                  //destructor
      shallow_clear();
    }

Member Function Documentation

add_sorted()

bool CLIST::add_sorted	(	int	comparatorconst void *, const void *,
		bool	unique,
		void *	new_data
	)

Definition at line 170 of file clst.cpp.

                                                    {
  // Check for adding at the end.
  if (last == NULL || comparator(&last->data, &new_data) < 0) {
    CLIST_LINK* new_element = new CLIST_LINK;
    new_element->data = new_data;
    if (last == NULL) {
      new_element->next = new_element;
    } else {
      new_element->next = last->next;
      last->next = new_element;
    }
    last = new_element;
    return true;
  } else if (!unique || last->data != new_data) {
    // Need to use an iterator.
    CLIST_ITERATOR it(this);
    for (it.mark_cycle_pt(); !it.cycled_list(); it.forward()) {
      void* data = it.data();
      if (data == new_data && unique)
        return false;
      if (comparator(&data, &new_data) > 0)
        break;
    }
    if (it.cycled_list())
      it.add_to_end(new_data);
    else
      it.add_before_then_move(new_data);
    return true;
  }
  return false;
}

assign_to_sublist()

void CLIST::assign_to_sublist	(	CLIST_ITERATOR *	start_it,
		CLIST_ITERATOR *	end_it
	)

Definition at line 97 of file clst.cpp.

                                                      {  //from list end
  const ERRCODE LIST_NOT_EMPTY =
    "Destination list must be empty before extracting a sublist";

  if (!empty ())
    LIST_NOT_EMPTY.error ("CLIST.assign_to_sublist", ABORT, NULL);

  last = start_it->extract_sublist (end_it);
}

empty()

bool CLIST::empty ( ) const

inline

Definition at line 95 of file clst.h.

                       {  //is list empty?
      return !last;
    }

internal_deep_clear()

void CLIST::internal_deep_clear

(

void(*)(void *)

zapper

)

Definition at line 41 of file clst.cpp.

                         {       //ptr to zapper functn
  CLIST_LINK *ptr;
  CLIST_LINK *next;

  if (!empty ()) {
    ptr = last->next;            //set to first
    last->next = NULL;           //break circle
    last = NULL;                 //set list empty
    while (ptr) {
      next = ptr->next;
      zapper (ptr->data);
      delete(ptr);
      ptr = next;
    }
  }
}

length()

inT32 CLIST::length

(

)

const

Definition at line 115 of file clst.cpp.

                          {  //count elements
  CLIST_ITERATOR it(const_cast<CLIST*>(this));
  inT32 count = 0;

  for (it.mark_cycle_pt(); !it.cycled_list(); it.forward())
    count++;
  return count;
}

set_subtract()

void CLIST::set_subtract	(	int	comparatorconst void *, const void *,
		bool	unique,
		CLIST *	minuend,
		CLIST *	subtrahend
	)

Definition at line 208 of file clst.cpp.

                                                            {
  shallow_clear();
  CLIST_ITERATOR m_it(minuend);
  CLIST_ITERATOR s_it(subtrahend);
  // Since both lists are sorted, finding the subtras that are not
  // minus is a case of a parallel iteration.
  for (m_it.mark_cycle_pt(); !m_it.cycled_list(); m_it.forward()) {
    void* minu = m_it.data();
    void* subtra = NULL;
    if (!s_it.empty()) {
      subtra = s_it.data();
      while (!s_it.at_last() &&
             comparator(&subtra, &minu) < 0) {
        s_it.forward();
        subtra = s_it.data();
      }
    }
    if (subtra == NULL || comparator(&subtra, &minu) != 0)
      add_sorted(comparator, unique, minu);
  }
}

shallow_clear()

void CLIST::shallow_clear

(

)

Definition at line 68 of file clst.cpp.

                          {  //destroy all links
  CLIST_LINK *ptr;
  CLIST_LINK *next;

  if (!empty ()) {
    ptr = last->next;            //set to first
    last->next = NULL;           //break circle
    last = NULL;                 //set list empty
    while (ptr) {
      next = ptr->next;
      delete(ptr);
      ptr = next;
    }
  }
}

shallow_copy()

void CLIST::shallow_copy ( CLIST *  from_list )

inline

Definition at line 103 of file clst.h.

                                        {  //beware destructors!!
      last = from_list->last;
    }

singleton()

bool CLIST::singleton ( ) const

inline

Definition at line 99 of file clst.h.

                           {
      return last != NULL ? (last == last->next) : false;
    }

sort()

void CLIST::sort

(

int

comparator const void *, const void *

)

Definition at line 131 of file clst.cpp.

                             {
  CLIST_ITERATOR it(this);
  inT32 count;
  void **base;                   //ptr array to sort
  void **current;
  inT32 i;

  /* Allocate an array of pointers, one per list element */
  count = length ();
  base = (void **) malloc (count * sizeof (void *));

  /* Extract all elements, putting the pointers in the array */
  current = base;
  for (it.mark_cycle_pt (); !it.cycled_list (); it.forward ()) {
    *current = it.extract ();
    current++;
  }

  /* Sort the pointer array */
  qsort ((char *) base, count, sizeof (*base), comparator);

  /* Rebuild the list from the sorted pointers */
  current = base;
  for (i = 0; i < count; i++) {
    it.add_to_end (*current);
    current++;
  }
  free(base);
}

Friends And Related Function Documentation

CLIST_ITERATOR

friend class CLIST_ITERATOR

friend

Definition at line 72 of file clst.h.

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The documentation for this class was generated from the following files:

• /home/stefan/src/github/tesseract-ocr/tesseract/ccutil/clst.h
• /home/stefan/src/github/tesseract-ocr/tesseract/ccutil/clst.cpp