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authorVolker Hilsheimer <volker.hilsheimer@nokia.com>2009-07-30 12:47:14 (GMT)
committerVolker Hilsheimer <volker.hilsheimer@nokia.com>2009-07-30 12:49:53 (GMT)
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-/****************************************************************************
-**
-** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
-** Contact: Nokia Corporation (qt-info@nokia.com)
-**
-** This file is part of the documentation of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** No Commercial Usage
-** This file contains pre-release code and may not be distributed.
-** You may use this file in accordance with the terms and conditions
-** contained in the either Technology Preview License Agreement or the
-** Beta Release License Agreement.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 2.1 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 2.1 requirements
-** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
-**
-** In addition, as a special exception, Nokia gives you certain
-** additional rights. These rights are described in the Nokia Qt LGPL
-** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
-** package.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 3.0 as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU General Public License version 3.0 requirements will be
-** met: http://www.gnu.org/copyleft/gpl.html.
-**
-** If you are unsure which license is appropriate for your use, please
-** contact the sales department at http://www.qtsoftware.com/contact.
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-/*!
- \class Q3MemArray
- \brief The Q3MemArray class is a template class that provides arrays of simple types.
- \compat
-
- Q3MemArray is implemented as a template class. Define a template
- instance Q3MemArray\<X\> to create an array that contains X items.
-
- Q3MemArray stores the array elements directly in the array. It can
- only deal with simple types (i.e. C++ types, structs, and classes
- that have no constructors, destructors, or virtual functions).
- Q3MemArray uses bitwise operations to copy and compare array
- elements.
-
- The Q3PtrVector collection class is also a kind of array. Like most
- old Qt collection classes, it uses pointers to the contained items.
-
- Q3MemArray uses explicit sharing with a
- reference count. If more than one array shares common data and one
- of the arrays is modified, all the arrays are modified.
-
- The benefit of sharing is that a program does not need to duplicate
- data when it is not required, which results in lower memory use
- and less copying of data.
-
- Example:
- \snippet doc/src/snippets/code/doc_src_q3memarray.qdoc 0
-
- Program output:
- \snippet doc/src/snippets/code/doc_src_q3memarray.qdoc 1
-
- Note concerning the use of Q3MemArray for manipulating structs or
- classes: Compilers will often pad the size of structs of odd sizes
- up to the nearest word boundary. This will then be the size
- Q3MemArray will use for its bitwise element comparisons. Because
- the remaining bytes will typically be uninitialized, this can
- cause find() etc. to fail to find the element. Example:
-
- \snippet doc/src/snippets/code/doc_src_q3memarray.qdoc 2
-
- To work around this, make sure that you use a struct where
- sizeof() returns the same as the sum of the sizes of the members
- either by changing the types of the struct members or by adding
- dummy members.
-
- Q3MemArray data can be traversed by iterators (see begin() and
- end()). The number of items is returned by count(). The array can
- be resized with resize() and filled using fill().
-
- You can make a shallow copy of the array with assign() (or
- operator=()) and a deep copy with duplicate().
-
- Search for values in the array with find() and contains(). For
- sorted arrays (see sort()) you can search using bsearch().
-
- You can set the data directly using setRawData() and
- resetRawData(), although this requires care.
-*/
-
-/*! \fn Q3MemArray::operator QVector<type>() const
-
- Automatically converts the Q3MemArray<type> into a QVector<type>.
-*/
-
-/*! \typedef Q3MemArray::Iterator
- A Q3MemArray iterator.
- \sa begin() end()
-*/
-/*! \typedef Q3MemArray::ConstIterator
- A const Q3MemArray iterator.
- \sa begin() end()
-*/
-/*! \typedef Q3MemArray::ValueType
- \internal
-*/
-
-/*!
- \fn Q3MemArray::Q3MemArray()
-
- Constructs a null array.
-
- \sa isNull()
-*/
-
-/*!
- \fn Q3MemArray::Q3MemArray( int size )
-
- Constructs an array with room for \a size elements. Makes a null
- array if \a size == 0.
-
- The elements are left uninitialized.
-
- \sa resize(), isNull()
-*/
-
-/*!
- \fn Q3MemArray::Q3MemArray( const Q3MemArray<type> &a )
-
- Constructs a shallow copy of \a a.
-
- \sa assign()
-*/
-
-/*!
- \fn Q3MemArray::Q3MemArray(const QVector<type> &vector)
-
- Constructs a copy of \a vector.
-*/
-
-/*!
- \fn Q3MemArray::Q3MemArray(int arg1, int arg2)
-
- Constructs an array \e{without allocating} array space. The
- arguments \a arg1 and \a arg2 should be zero. Use at your own
- risk.
-*/
-
-/*!
- \fn Q3MemArray::~Q3MemArray()
-
- Dereferences the array data and deletes it if this was the last
- reference.
-*/
-
-/*!
- \fn Q3MemArray<type> &Q3MemArray::operator=( const Q3MemArray<type> &a )
-
- Assigns a shallow copy of \a a to this array and returns a
- reference to this array.
-
- Equivalent to assign( a ).
-*/
-
-/*!
- \fn type *Q3MemArray::data() const
-
- Returns a pointer to the actual array data.
-
- The array is a null array if data() == 0 (null pointer).
-
- \sa isNull()
-*/
-
-/*!
- \fn uint Q3MemArray::nrefs() const
-
- Returns the reference count for the shared array data. This
- reference count is always greater than zero.
-*/
-
-/*!
- \fn uint Q3MemArray::size() const
-
- Returns the size of the array (maximum number of elements).
-
- The array is a null array if size() == 0.
-
- \sa isNull(), resize()
-*/
-
-/*!
- \fn uint Q3MemArray::count() const
-
- Returns the same as size().
-
- \sa size()
-*/
-
-/*!
- \fn bool Q3MemArray::isEmpty() const
-
- Returns TRUE if the array is empty; otherwise returns FALSE.
-
- isEmpty() is equivalent to isNull() for Q3MemArray (unlike
- QString).
-*/
-
-/*!
- \fn bool Q3MemArray::isNull() const
-
- Returns TRUE if the array is null; otherwise returns FALSE.
-
- A null array has size() == 0 and data() == 0.
-*/
-
-/*!
- \fn bool Q3MemArray::resize( uint size, Optimization optim )
-
- Resizes (expands or shrinks) the array to \a size elements. The
- array becomes a null array if \a size == 0.
-
- Returns TRUE if successful, or FALSE if the memory cannot be
- allocated.
-
- New elements are not initialized.
-
- \a optim is either Q3GArray::MemOptim (the default) or
- Q3GArray::SpeedOptim. When optimizing for speed rather than memory
- consumption, the array uses a smart grow and shrink algorithm that
- might allocate more memory than is actually needed for \a size
- elements. This speeds up subsequent resize operations, for example
- when appending many elements to an array, since the space has
- already been allocated.
-
- \sa size()
-*/
-
-/*!
- \fn bool Q3MemArray::resize( uint size )
-
- \overload
-
- Resizes (expands or shrinks) the array to \a size elements. The
- array becomes a null array if \a size == 0.
-
- Returns TRUE if successful, i.e. if the memory can be allocated;
- otherwise returns FALSE.
-
- New elements are not initialized.
-
- \sa size()
-*/
-
-/*!
- \fn bool Q3MemArray::truncate( uint pos )
-
- Truncates the array at position \a pos.
-
- Returns TRUE if successful, i.e. if the memory can be allocated;
- otherwise returns FALSE.
-
- Equivalent to resize(\a pos).
-
- \sa resize()
-*/
-
-/*!
- \fn bool Q3MemArray::fill( const type &v, int size )
-
- Fills the array with the value \a v. If \a size is specified as
- different from -1, then the array will be resized before being
- filled.
-
- Returns TRUE if successful, i.e. if \a size is -1, or \a size is
- != -1 and the memory can be allocated; otherwise returns FALSE.
-
- \sa resize()
-*/
-
-/*!
- \fn void Q3MemArray::detach()
-
- Detaches this array from shared array data; i.e. it makes a
- private, deep copy of the data.
-
- Copying will be performed only if the \link nrefs() reference
- count\endlink is greater than one.
-
- \sa copy()
-*/
-
-/*!
- \fn Q3MemArray<type> Q3MemArray::copy() const
-
- Returns a deep copy of this array.
-
- \sa detach(), duplicate()
-*/
-
-/*!
- \fn Q3MemArray<type> &Q3MemArray::assign( const Q3MemArray<type> &a )
-
- Shallow copy. Dereferences the current array and references the
- data contained in \a a instead. Returns a reference to this array.
-
- \sa operator=()
-*/
-
-/*!
- \fn Q3MemArray<type> &Q3MemArray::assign( const type *data, uint size )
-
- \overload
-
- Shallow copy. Dereferences the current array and references the
- array data \a data, which contains \a size elements. Returns a
- reference to this array.
-
- Do not delete \a data later; Q3MemArray will call free() on it
- at the right time.
-*/
-
-/*!
- \fn Q3MemArray<type> &Q3MemArray::duplicate( const Q3MemArray<type> &a )
-
- Deep copy. Dereferences the current array and obtains a copy of
- the data contained in \a a instead. Returns a reference to this
- array.
-
- \sa copy()
-*/
-
-/*!
- \fn Q3MemArray<type> &Q3MemArray::duplicate( const type *data, uint size )
-
- \overload
-
- Deep copy. Dereferences the current array and obtains a copy of
- the array data \a data instead. Returns a reference to this array.
- The size of the array is given by \a size.
-
- \sa copy()
-*/
-
-/*!
- \fn Q3MemArray<type> &Q3MemArray::setRawData( const type *data, uint size )
-
- Sets raw data and returns a reference to the array.
-
- Dereferences the current array and sets the new array data to \a
- data and the new array size to \a size. Do not attempt to resize
- or re-assign the array data when raw data has been set. Call
- resetRawData(\a data, \a size) to reset the array.
-
- Setting raw data is useful because it sets Q3MemArray data without
- allocating memory or copying data.
-
- Example I (intended use):
- \snippet doc/src/snippets/code/doc_src_q3memarray.qdoc 3
-
- Example II (you don't want to do this):
- \snippet doc/src/snippets/code/doc_src_q3memarray.qdoc 4
-
- \warning If you do not call resetRawData(), Q3MemArray will attempt
- to deallocate or reallocate the raw data, which might not be too
- good. Be careful.
-
- \sa resetRawData()
-*/
-
-/*!
- \fn void Q3MemArray::resetRawData( const type *data, uint size )
-
- Removes internal references to the raw data that was set using
- setRawData(). This means that Q3MemArray no longer has access to
- the \a data, so you are free to manipulate \a data as you wish.
- You can now use the Q3MemArray without affecting the original \a
- data, for example by calling setRawData() with a pointer to some
- other data.
-
- The arguments must be the \a data and length, \a size, that were
- passed to setRawData(). This is for consistency checking.
-
- \sa setRawData()
-*/
-
-/*!
- \fn int Q3MemArray::find( const type &v, uint index ) const
-
- Finds the first occurrence of \a v, starting at position \a index.
-
- Returns the position of \a v, or -1 if \a v could not be found.
-
- \sa contains()
-*/
-
-/*!
- \fn int Q3MemArray::contains( const type &v ) const
-
- Returns the number of times \a v occurs in the array.
-
- \sa find()
-*/
-
-/*!
- \fn void Q3MemArray::sort()
-
- Sorts the array elements in ascending order, using bitwise
- comparison (memcmp()).
-
- \sa bsearch()
-*/
-
-/*!
- \fn int Q3MemArray::bsearch( const type &v ) const
-
- In a sorted array (as sorted by sort()), finds the first
- occurrence of \a v by using a binary search. For a sorted
- array this is generally much faster than find(), which does
- a linear search.
-
- Returns the position of \a v, or -1 if \a v could not be found.
-
- \sa sort(), find()
-*/
-
-/*!
- \fn type &Q3MemArray::operator[]( int index ) const
-
- Returns a reference to the element at position \a index in the
- array.
-
- This can be used to both read and set an element. Equivalent to
- at().
-
- \sa at()
-*/
-
-/*!
- \fn type &Q3MemArray::at( uint index ) const
-
- Returns a reference to the element at position \a index in the array.
-
- This can be used to both read and set an element.
-
- \sa operator[]()
-*/
-
-/*!
- \fn Q3MemArray::operator const type *() const
-
- Cast operator. Returns a pointer to the array.
-
- \sa data()
-*/
-
-/*!
- \fn bool Q3MemArray::operator==( const Q3MemArray<type> &a ) const
-
- Returns TRUE if this array is equal to \a a; otherwise returns
- FALSE.
-
- The two arrays are compared bitwise.
-
- \sa operator!=()
-*/
-
-/*!
- \fn bool Q3MemArray::operator!=( const Q3MemArray<type> &a ) const
-
- Returns TRUE if this array is different from \a a; otherwise
- returns FALSE.
-
- The two arrays are compared bitwise.
-
- \sa operator==()
-*/
-
-/*!
- \fn Iterator Q3MemArray::begin()
-
- Returns an iterator pointing at the beginning of this array. This
- iterator can be used in the same way as the iterators of
- Q3ValueList and QMap, for example.
-*/
-
-/*!
- \fn Iterator Q3MemArray::end()
-
- Returns an iterator pointing behind the last element of this
- array. This iterator can be used in the same way as the iterators
- of Q3ValueList and QMap, for example.
-*/
-
-/*!
- \fn ConstIterator Q3MemArray::begin() const
-
- \overload
-
- Returns a const iterator pointing at the beginning of this array.
- This iterator can be used in the same way as the iterators of
- Q3ValueList and QMap, for example.
-*/
-
-/*!
- \fn ConstIterator Q3MemArray::end() const
-
- \overload
-
- Returns a const iterator pointing behind the last element of this
- array. This iterator can be used in the same way as the iterators
- of Q3ValueList and QMap, for example.
-*/