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/*!

  \class Q3PtrVector

  \brief The Q3PtrVector class is a template collection class that

  provides a vector (array).

  \compat

  Q3ValueVector is an STL-compatible alternative to this class.

  Q3PtrVector is implemented as a template class. Defines a template

  instance Q3PtrVector\<X\> to create a vector that contains pointers

  to X (X*).

  A vector is the same as an array. The main difference between

  Q3PtrVector and Q3MemArray is that Q3PtrVector stores pointers to the

  elements, whereas Q3MemArray stores the elements themselves (i.e.

  Q3MemArray is value-based and Q3PtrVector is pointer-based).

  Items are added to the vector using insert() or fill(). Items are

  removed with remove(). You can get a pointer to an item at a

  particular index position using at().

  Unless otherwise stated, all functions that remove items from the

  vector will also delete the element pointed to if \link

  setAutoDelete() auto-deletion\endlink is enabled. By default,

  auto-deletion is disabled; see setAutoDelete(). This behavior can

  be changed in a subclass by reimplementing the virtual function

  deleteItem().

  Functions that compare items (find() and sort() for example) will

  do so using the virtual function compareItems(). The default

  implementation of this function only compares the pointer values.

  Reimplement compareItems() in a subclass to get searching and

  sorting based on the item contents. You can perform a linear

  search for a pointer in the vector using findRef(), or a binary

  search (of a sorted vector) using bsearch(). You can count the

  number of times an item appears in the vector with contains() or

  containsRef().

  \sa Q3MemArray

*/

/*!

  \fn Q3PtrVector::Q3PtrVector()

  Constructs a null vector.

  \sa isNull()

*/

/*!

  \fn Q3PtrVector::Q3PtrVector(uint size)

  Constructs an vector with room for \a size items. Makes a null

  vector if \a size == 0.

  All \a size positions in the vector are initialized to 0.

  \sa size(), resize(), isNull()

*/

/*!

  \fn Q3PtrVector::Q3PtrVector(const Q3PtrVector<type> &v)

  Constructs a copy of \a v. Only the pointers are copied (i.e.

  shallow copy).

*/

/*!

  \fn Q3PtrVector::~Q3PtrVector()

  Removes all items from the vector, and destroys the vector itself.

  \sa clear()

*/

/*!

  \fn Q3PtrVector<type> &Q3PtrVector::operator=(const Q3PtrVector<type> &v)

  Assigns \a v to this vector and returns a reference to this

  vector.

  This vector is first cleared and then all the items from \a v are

  copied into the vector. Only the pointers are copied (i.e. shallow

  copy).

  \sa clear()

*/

/*!

  \fn type **Q3PtrVector::data() const

  Returns a pointer to the actual vector data, which is an array of

  type*.

  The vector is a null vector if data() == 0 (null pointer).

  \sa isNull()

*/

/*!

  \fn uint Q3PtrVector::size() const

  Returns the size of the vector, i.e. the number of vector

  positions. This is also the maximum number of items the vector can

  hold.

  The vector is a null vector if size() == 0.

  \sa isNull(), resize(), count()

*/

/*!

  \fn uint Q3PtrVector::count() const 

  Returns the number of items in the vector. The vector is empty if

  count() == 0.

  \sa isEmpty(), size(), isNull()

*/

/*!

  \fn bool Q3PtrVector::isEmpty() const

  Returns true if the vector is empty; otherwise returns false.

  \sa count()

*/

/*!

  \fn bool Q3PtrVector::isNull() const

  Returns true if the vector is null; otherwise returns false.

  A null vector has size() == 0 and data() == 0.

  \sa size()

*/

/*!

  \fn bool Q3PtrVector::resize(uint size)

  Resizes (expands or shrinks) the vector to \a size elements. The

  vector becomes a null vector if \a size == 0.

  Any items at position \a size or beyond in the vector are removed.

  New positions are initialized to 0.

  Returns true if successful, i.e. if the memory was successfully

  allocated; otherwise returns false.

  \sa size(), isNull()

*/

/*!

  \fn bool Q3PtrVector::insert(uint i, const type *d)

  Sets position \a i in the vector to contain the item \a d. \a i

  must be less than size(). Any previous element in position \a i is

  removed.

  Returns true if \a i is within range; otherwise returns false.

  \sa at()

*/

/*!

  \fn bool Q3PtrVector::remove(uint i)

  Removes the item at position \a i in the vector, if there is one.

  \a i must be less than size().

  Returns true if \a i is within range; otherwise returns false.

  \sa take(), at()

*/

/*!

  \fn type* Q3PtrVector::take(uint i)

  Returns the item at position \a i in the vector, and removes that

  item from the vector. \a i must be less than size(). If there is

  no item at position \a i, 0 is returned.

  Unlike remove(), this function does \e not call deleteItem() for

  the removed item.

  \sa remove(), at()

*/

/*!

  \fn void Q3PtrVector::clear()

  Removes all items from the vector, and destroys the vector itself.

  The vector becomes a null vector.

  \sa isNull()

*/

/*!

  \fn bool Q3PtrVector::fill(const type *d, int size)

  Inserts item \a d in all positions in the vector. Any existing

  items are removed. If \a d is 0, the vector becomes empty.

  If \a size >= 0, the vector is first resized to \a size. By

  default, \a size is -1.

  Returns true if successful, i.e. \a size is the same as the

  current size, or \a size is larger and the memory has successfully

  been allocated; otherwise returns false.

  \sa resize(), insert(), isEmpty()

*/

/*!

  \fn void Q3PtrVector::sort()

  Sorts the items in ascending order. Any empty positions will be

  put last.

  Compares items using the virtual function compareItems().

  \sa bsearch()

*/

/*!

  \fn int Q3PtrVector::bsearch(const type* d) const

  In a sorted array, finds the first occurrence of \a d using a

  binary search. For a sorted array, this is generally much faster

  than find(), which performs a linear search.

  Returns the position of \a d, or -1 if \a d could not be found. \a

  d must not be 0.

  Compares items using the virtual function compareItems().

  \sa sort(), find()

*/

/*!

  \fn int Q3PtrVector::findRef(const type *d, uint i) const

  Finds the first occurrence of the item pointer \a d in the vector

  using a linear search. The search starts at position \a i, which

  must be less than size(). \a i is by default 0; i.e. the search

  starts at the start of the vector.

  Returns the position of \a d, or -1 if \a d could not be found.

  This function does \e not use compareItems() to compare items.

  Use the much faster bsearch() to search a sorted vector.

  \sa find(), bsearch()

*/

/*!

  \fn int Q3PtrVector::find(const type *d, uint i) const

  Finds the first occurrence of item \a d in the vector using a

  linear search. The search starts at position \a i, which must be

  less than size(). \a i is by default 0; i.e. the search starts at

  the start of the vector.

  Returns the position of \a d, or -1 if \a d could not be found.

  Compares items using the virtual function compareItems().

  Use the much faster bsearch() to search a sorted vector.

  \sa findRef(), bsearch()

*/

/*!

  \fn uint Q3PtrVector::containsRef(const type *d) const

  Returns the number of occurrences of the item pointer \a d in the

  vector.

  This function does \e not use compareItems() to compare items.

  \sa findRef()

*/

/*!

  \fn uint Q3PtrVector::contains(const type *d) const

  Returns the number of occurrences of item \a d in the vector.

  Compares items using the virtual function compareItems().

  \sa containsRef()

*/

/*!

  \fn type *Q3PtrVector::operator[](int i) const

  Returns the item at position \a i, or 0 if there is no item at

  that position. \a i must be less than size().

  Equivalent to at(\a i).

  \sa at()

*/

/*!

  \fn type *Q3PtrVector::at(uint i) const

  Returns the item at position \a i, or 0 if there is no item at

  that position. \a i must be less than size().

*/

/*!

  \fn void Q3PtrVector::toList(Q3GList *list) const

  \internal

  Copies all items in this vector to the list \a list. \a list is

  first cleared and then all items are appended to \a list.

  \sa Q3PtrList, Q3PtrStack, Q3PtrQueue

*/

/*!

  \fn int Q3PtrVector::compareItems(Q3PtrCollection::Item d1,

				    Q3PtrCollection::Item d2)

  This virtual function compares two list items.

  Returns:

  \list

  \i zero if \a d1 == \a d2

  \i nonzero if \a d1 != \a d2

  \endlist

  This function returns \e int rather than \e bool so that

  reimplementations can return one of three values and use it to

  sort by:

  \list

  \i 0 if \a d1 == \a d2

  \i \> 0 (positive integer) if \a d1 \> \a d2

  \i \< 0 (negative integer) if \a d1 \< \a d2

  \endlist

  The sort() and bsearch() functions require compareItems() to be

  implemented as described here.

  This function should not modify the vector because some const

  functions call compareItems().

*/

/*!

  \fn QDataStream& Q3PtrVector::read(QDataStream &s,

				     Q3PtrCollection::Item &item)

  Reads a vector item, \a item, from the stream \a s and returns a

  reference to the stream.

  The default implementation sets \a item to 0.

  \sa write()

*/

/*!

  \fn QDataStream& Q3PtrVector::write(QDataStream &s,

			 	      Q3PtrCollection::Item item) const

  Writes a vector item, \a item, to the stream \a s and returns a

  reference to the stream.

  The default implementation does nothing.

  \sa read()

*/

/*!

  \fn bool Q3PtrVector::operator==(const Q3PtrVector<type> &v) const

  Returns true if this vector and \a v are equal; otherwise returns

  false.

*/