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805 lines
30 KiB
C++
805 lines
30 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE library - "Jules' Utility Class Extensions"
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Copyright 2004-10 by Raw Material Software Ltd.
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------------------------------------------------------------------------------
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JUCE can be redistributed and/or modified under the terms of the GNU General
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Public License (Version 2), as published by the Free Software Foundation.
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A copy of the license is included in the JUCE distribution, or can be found
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online at www.gnu.org/licenses.
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JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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------------------------------------------------------------------------------
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To release a closed-source product which uses JUCE, commercial licenses are
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available: visit www.rawmaterialsoftware.com/juce for more information.
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==============================================================================
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*/
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#ifndef __JUCE_OWNEDARRAY_JUCEHEADER__
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#define __JUCE_OWNEDARRAY_JUCEHEADER__
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#include "juce_ArrayAllocationBase.h"
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#include "juce_ElementComparator.h"
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#include "../threads/juce_CriticalSection.h"
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//==============================================================================
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/** An array designed for holding objects.
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This holds a list of pointers to objects, and will automatically
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delete the objects when they are removed from the array, or when the
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array is itself deleted.
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Declare it in the form: OwnedArray<MyObjectClass>
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..and then add new objects, e.g. myOwnedArray.add (new MyObjectClass());
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After adding objects, they are 'owned' by the array and will be deleted when
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removed or replaced.
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To make all the array's methods thread-safe, pass in "CriticalSection" as the templated
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TypeOfCriticalSectionToUse parameter, instead of the default DummyCriticalSection.
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@see Array, ReferenceCountedArray, StringArray, CriticalSection
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*/
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template <class ObjectClass,
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class TypeOfCriticalSectionToUse = DummyCriticalSection>
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class OwnedArray
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{
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public:
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//==============================================================================
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/** Creates an empty array. */
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OwnedArray() throw()
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: numUsed (0)
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{
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}
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/** Deletes the array and also deletes any objects inside it.
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To get rid of the array without deleting its objects, use its
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clear (false) method before deleting it.
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*/
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~OwnedArray()
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{
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clear (true);
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}
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//==============================================================================
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/** Clears the array, optionally deleting the objects inside it first. */
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void clear (const bool deleteObjects = true)
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{
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const ScopedLockType lock (getLock());
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if (deleteObjects)
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{
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while (numUsed > 0)
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delete data.elements [--numUsed];
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}
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data.setAllocatedSize (0);
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numUsed = 0;
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}
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//==============================================================================
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/** Returns the number of items currently in the array.
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@see operator[]
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*/
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inline int size() const throw()
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{
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return numUsed;
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}
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/** Returns a pointer to the object at this index in the array.
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If the index is out-of-range, this will return a null pointer, (and
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it could be null anyway, because it's ok for the array to hold null
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pointers as well as objects).
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@see getUnchecked
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*/
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inline ObjectClass* operator[] (const int index) const throw()
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{
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const ScopedLockType lock (getLock());
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return isPositiveAndBelow (index, numUsed) ? data.elements [index]
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: static_cast <ObjectClass*> (0);
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}
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/** Returns a pointer to the object at this index in the array, without checking whether the index is in-range.
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This is a faster and less safe version of operator[] which doesn't check the index passed in, so
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it can be used when you're sure the index if always going to be legal.
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*/
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inline ObjectClass* getUnchecked (const int index) const throw()
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{
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const ScopedLockType lock (getLock());
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jassert (isPositiveAndBelow (index, numUsed));
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return data.elements [index];
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}
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/** Returns a pointer to the first object in the array.
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This will return a null pointer if the array's empty.
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@see getLast
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*/
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inline ObjectClass* getFirst() const throw()
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{
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const ScopedLockType lock (getLock());
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return numUsed > 0 ? data.elements [0]
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: static_cast <ObjectClass*> (0);
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}
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/** Returns a pointer to the last object in the array.
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This will return a null pointer if the array's empty.
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@see getFirst
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*/
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inline ObjectClass* getLast() const throw()
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{
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const ScopedLockType lock (getLock());
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return numUsed > 0 ? data.elements [numUsed - 1]
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: static_cast <ObjectClass*> (0);
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}
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/** Returns a pointer to the actual array data.
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This pointer will only be valid until the next time a non-const method
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is called on the array.
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*/
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inline ObjectClass** getRawDataPointer() throw()
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{
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return data.elements;
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}
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//==============================================================================
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/** Finds the index of an object which might be in the array.
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@param objectToLookFor the object to look for
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@returns the index at which the object was found, or -1 if it's not found
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*/
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int indexOf (const ObjectClass* const objectToLookFor) const throw()
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{
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const ScopedLockType lock (getLock());
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ObjectClass* const* e = data.elements.getData();
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ObjectClass* const* const end = e + numUsed;
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while (e != end)
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{
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if (objectToLookFor == *e)
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return static_cast <int> (e - data.elements.getData());
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++e;
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}
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return -1;
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}
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/** Returns true if the array contains a specified object.
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@param objectToLookFor the object to look for
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@returns true if the object is in the array
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*/
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bool contains (const ObjectClass* const objectToLookFor) const throw()
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{
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const ScopedLockType lock (getLock());
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ObjectClass* const* e = data.elements.getData();
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ObjectClass* const* const end = e + numUsed;
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while (e != end)
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{
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if (objectToLookFor == *e)
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return true;
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++e;
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}
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return false;
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}
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//==============================================================================
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/** Appends a new object to the end of the array.
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Note that the this object will be deleted by the OwnedArray when it
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is removed, so be careful not to delete it somewhere else.
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Also be careful not to add the same object to the array more than once,
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as this will obviously cause deletion of dangling pointers.
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@param newObject the new object to add to the array
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@see set, insert, addIfNotAlreadyThere, addSorted
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*/
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void add (const ObjectClass* const newObject) throw()
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{
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const ScopedLockType lock (getLock());
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data.ensureAllocatedSize (numUsed + 1);
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data.elements [numUsed++] = const_cast <ObjectClass*> (newObject);
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}
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/** Inserts a new object into the array at the given index.
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Note that the this object will be deleted by the OwnedArray when it
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is removed, so be careful not to delete it somewhere else.
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If the index is less than 0 or greater than the size of the array, the
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element will be added to the end of the array.
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Otherwise, it will be inserted into the array, moving all the later elements
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along to make room.
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Be careful not to add the same object to the array more than once,
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as this will obviously cause deletion of dangling pointers.
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@param indexToInsertAt the index at which the new element should be inserted
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@param newObject the new object to add to the array
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@see add, addSorted, addIfNotAlreadyThere, set
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*/
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void insert (int indexToInsertAt,
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const ObjectClass* const newObject) throw()
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{
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if (indexToInsertAt >= 0)
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{
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const ScopedLockType lock (getLock());
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if (indexToInsertAt > numUsed)
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indexToInsertAt = numUsed;
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data.ensureAllocatedSize (numUsed + 1);
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ObjectClass** const e = data.elements + indexToInsertAt;
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const int numToMove = numUsed - indexToInsertAt;
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if (numToMove > 0)
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memmove (e + 1, e, numToMove * sizeof (ObjectClass*));
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*e = const_cast <ObjectClass*> (newObject);
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++numUsed;
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}
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else
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{
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add (newObject);
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}
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}
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/** Appends a new object at the end of the array as long as the array doesn't
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already contain it.
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If the array already contains a matching object, nothing will be done.
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@param newObject the new object to add to the array
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*/
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void addIfNotAlreadyThere (const ObjectClass* const newObject) throw()
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{
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const ScopedLockType lock (getLock());
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if (! contains (newObject))
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add (newObject);
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}
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/** Replaces an object in the array with a different one.
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If the index is less than zero, this method does nothing.
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If the index is beyond the end of the array, the new object is added to the end of the array.
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Be careful not to add the same object to the array more than once,
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as this will obviously cause deletion of dangling pointers.
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@param indexToChange the index whose value you want to change
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@param newObject the new value to set for this index.
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@param deleteOldElement whether to delete the object that's being replaced with the new one
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@see add, insert, remove
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*/
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void set (const int indexToChange,
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const ObjectClass* const newObject,
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const bool deleteOldElement = true)
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{
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if (indexToChange >= 0)
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{
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ObjectClass* toDelete = 0;
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{
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const ScopedLockType lock (getLock());
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if (indexToChange < numUsed)
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{
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if (deleteOldElement)
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{
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toDelete = data.elements [indexToChange];
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if (toDelete == newObject)
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toDelete = 0;
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}
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data.elements [indexToChange] = const_cast <ObjectClass*> (newObject);
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}
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else
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{
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data.ensureAllocatedSize (numUsed + 1);
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data.elements [numUsed++] = const_cast <ObjectClass*> (newObject);
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}
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}
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delete toDelete; // don't want to use a ScopedPointer here because if the
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// object has a private destructor, both OwnedArray and
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// ScopedPointer would need to be friend classes..
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}
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else
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{
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jassertfalse; // you're trying to set an object at a negative index, which doesn't have
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// any effect - but since the object is not being added, it may be leaking..
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}
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}
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/** Adds elements from another array to the end of this array.
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@param arrayToAddFrom the array from which to copy the elements
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@param startIndex the first element of the other array to start copying from
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@param numElementsToAdd how many elements to add from the other array. If this
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value is negative or greater than the number of available elements,
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all available elements will be copied.
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@see add
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*/
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template <class OtherArrayType>
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void addArray (const OtherArrayType& arrayToAddFrom,
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int startIndex = 0,
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int numElementsToAdd = -1)
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{
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const typename OtherArrayType::ScopedLockType lock1 (arrayToAddFrom.getLock());
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const ScopedLockType lock2 (getLock());
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if (startIndex < 0)
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{
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jassertfalse;
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startIndex = 0;
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}
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if (numElementsToAdd < 0 || startIndex + numElementsToAdd > arrayToAddFrom.size())
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numElementsToAdd = arrayToAddFrom.size() - startIndex;
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data.ensureAllocatedSize (numUsed + numElementsToAdd);
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while (--numElementsToAdd >= 0)
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{
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data.elements [numUsed] = arrayToAddFrom.getUnchecked (startIndex++);
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++numUsed;
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}
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}
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/** Adds copies of the elements in another array to the end of this array.
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The other array must be either an OwnedArray of a compatible type of object, or an Array
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containing pointers to the same kind of object. The objects involved must provide
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a copy constructor, and this will be used to create new copies of each element, and
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add them to this array.
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@param arrayToAddFrom the array from which to copy the elements
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@param startIndex the first element of the other array to start copying from
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@param numElementsToAdd how many elements to add from the other array. If this
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value is negative or greater than the number of available elements,
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all available elements will be copied.
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@see add
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*/
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template <class OtherArrayType>
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void addCopiesOf (const OtherArrayType& arrayToAddFrom,
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int startIndex = 0,
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int numElementsToAdd = -1)
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{
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const typename OtherArrayType::ScopedLockType lock1 (arrayToAddFrom.getLock());
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const ScopedLockType lock2 (getLock());
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if (startIndex < 0)
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{
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jassertfalse;
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startIndex = 0;
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}
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if (numElementsToAdd < 0 || startIndex + numElementsToAdd > arrayToAddFrom.size())
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numElementsToAdd = arrayToAddFrom.size() - startIndex;
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data.ensureAllocatedSize (numUsed + numElementsToAdd);
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while (--numElementsToAdd >= 0)
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{
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data.elements [numUsed] = new ObjectClass (*arrayToAddFrom.getUnchecked (startIndex++));
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++numUsed;
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}
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}
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/** Inserts a new object into the array assuming that the array is sorted.
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This will use a comparator to find the position at which the new object
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should go. If the array isn't sorted, the behaviour of this
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method will be unpredictable.
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@param comparator the comparator to use to compare the elements - see the sort method
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for details about this object's structure
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@param newObject the new object to insert to the array
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@see add, sort, indexOfSorted
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*/
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template <class ElementComparator>
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void addSorted (ElementComparator& comparator,
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ObjectClass* const newObject) throw()
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{
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(void) comparator; // if you pass in an object with a static compareElements() method, this
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// avoids getting warning messages about the parameter being unused
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const ScopedLockType lock (getLock());
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insert (findInsertIndexInSortedArray (comparator, data.elements.getData(), newObject, 0, numUsed), newObject);
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}
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/** Finds the index of an object in the array, assuming that the array is sorted.
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This will use a comparator to do a binary-chop to find the index of the given
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element, if it exists. If the array isn't sorted, the behaviour of this
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method will be unpredictable.
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@param comparator the comparator to use to compare the elements - see the sort()
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method for details about the form this object should take
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@param objectToLookFor the object to search for
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@returns the index of the element, or -1 if it's not found
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@see addSorted, sort
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*/
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template <class ElementComparator>
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int indexOfSorted (ElementComparator& comparator,
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const ObjectClass* const objectToLookFor) const throw()
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{
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(void) comparator; // if you pass in an object with a static compareElements() method, this
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// avoids getting warning messages about the parameter being unused
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const ScopedLockType lock (getLock());
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int start = 0;
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int end = numUsed;
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for (;;)
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{
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if (start >= end)
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{
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return -1;
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}
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else if (comparator.compareElements (objectToLookFor, data.elements [start]) == 0)
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{
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return start;
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}
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else
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{
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const int halfway = (start + end) >> 1;
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if (halfway == start)
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return -1;
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else if (comparator.compareElements (objectToLookFor, data.elements [halfway]) >= 0)
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start = halfway;
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else
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end = halfway;
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}
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}
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}
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//==============================================================================
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/** Removes an object from the array.
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This will remove the object at a given index (optionally also
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deleting it) and move back all the subsequent objects to close the gap.
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If the index passed in is out-of-range, nothing will happen.
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@param indexToRemove the index of the element to remove
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@param deleteObject whether to delete the object that is removed
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@see removeObject, removeRange
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*/
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void remove (const int indexToRemove,
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const bool deleteObject = true)
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{
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ObjectClass* toDelete = 0;
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{
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const ScopedLockType lock (getLock());
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if (isPositiveAndBelow (indexToRemove, numUsed))
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{
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ObjectClass** const e = data.elements + indexToRemove;
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if (deleteObject)
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toDelete = *e;
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--numUsed;
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const int numToShift = numUsed - indexToRemove;
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if (numToShift > 0)
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memmove (e, e + 1, numToShift * sizeof (ObjectClass*));
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}
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}
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delete toDelete; // don't want to use a ScopedPointer here because if the
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// object has a private destructor, both OwnedArray and
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// ScopedPointer would need to be friend classes..
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if ((numUsed << 1) < data.numAllocated)
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minimiseStorageOverheads();
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}
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/** Removes and returns an object from the array without deleting it.
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This will remove the object at a given index and return it, moving back all
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the subsequent objects to close the gap. If the index passed in is out-of-range,
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nothing will happen.
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@param indexToRemove the index of the element to remove
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@see remove, removeObject, removeRange
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*/
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ObjectClass* removeAndReturn (const int indexToRemove)
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{
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ObjectClass* removedItem = 0;
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const ScopedLockType lock (getLock());
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if (isPositiveAndBelow (indexToRemove, numUsed))
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{
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ObjectClass** const e = data.elements + indexToRemove;
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removedItem = *e;
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--numUsed;
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const int numToShift = numUsed - indexToRemove;
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if (numToShift > 0)
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memmove (e, e + 1, numToShift * sizeof (ObjectClass*));
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if ((numUsed << 1) < data.numAllocated)
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minimiseStorageOverheads();
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}
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return removedItem;
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}
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/** Removes a specified object from the array.
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If the item isn't found, no action is taken.
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@param objectToRemove the object to try to remove
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@param deleteObject whether to delete the object (if it's found)
|
|
@see remove, removeRange
|
|
*/
|
|
void removeObject (const ObjectClass* const objectToRemove,
|
|
const bool deleteObject = true)
|
|
{
|
|
const ScopedLockType lock (getLock());
|
|
ObjectClass** e = data.elements.getData();
|
|
|
|
for (int i = numUsed; --i >= 0;)
|
|
{
|
|
if (objectToRemove == *e)
|
|
{
|
|
remove (static_cast <int> (e - data.elements.getData()), deleteObject);
|
|
break;
|
|
}
|
|
|
|
++e;
|
|
}
|
|
}
|
|
|
|
/** Removes a range of objects from the array.
|
|
|
|
This will remove a set of objects, starting from the given index,
|
|
and move any subsequent elements down to close the gap.
|
|
|
|
If the range extends beyond the bounds of the array, it will
|
|
be safely clipped to the size of the array.
|
|
|
|
@param startIndex the index of the first object to remove
|
|
@param numberToRemove how many objects should be removed
|
|
@param deleteObjects whether to delete the objects that get removed
|
|
@see remove, removeObject
|
|
*/
|
|
void removeRange (int startIndex,
|
|
const int numberToRemove,
|
|
const bool deleteObjects = true)
|
|
{
|
|
const ScopedLockType lock (getLock());
|
|
const int endIndex = jlimit (0, numUsed, startIndex + numberToRemove);
|
|
startIndex = jlimit (0, numUsed, startIndex);
|
|
|
|
if (endIndex > startIndex)
|
|
{
|
|
if (deleteObjects)
|
|
{
|
|
for (int i = startIndex; i < endIndex; ++i)
|
|
{
|
|
delete data.elements [i];
|
|
data.elements [i] = 0; // (in case one of the destructors accesses this array and hits a dangling pointer)
|
|
}
|
|
}
|
|
|
|
const int rangeSize = endIndex - startIndex;
|
|
ObjectClass** e = data.elements + startIndex;
|
|
int numToShift = numUsed - endIndex;
|
|
numUsed -= rangeSize;
|
|
|
|
while (--numToShift >= 0)
|
|
{
|
|
*e = e [rangeSize];
|
|
++e;
|
|
}
|
|
|
|
if ((numUsed << 1) < data.numAllocated)
|
|
minimiseStorageOverheads();
|
|
}
|
|
}
|
|
|
|
/** Removes the last n objects from the array.
|
|
|
|
@param howManyToRemove how many objects to remove from the end of the array
|
|
@param deleteObjects whether to also delete the objects that are removed
|
|
@see remove, removeObject, removeRange
|
|
*/
|
|
void removeLast (int howManyToRemove = 1,
|
|
const bool deleteObjects = true)
|
|
{
|
|
const ScopedLockType lock (getLock());
|
|
|
|
if (howManyToRemove >= numUsed)
|
|
clear (deleteObjects);
|
|
else
|
|
removeRange (numUsed - howManyToRemove, howManyToRemove, deleteObjects);
|
|
}
|
|
|
|
/** Swaps a pair of objects in the array.
|
|
|
|
If either of the indexes passed in is out-of-range, nothing will happen,
|
|
otherwise the two objects at these positions will be exchanged.
|
|
*/
|
|
void swap (const int index1,
|
|
const int index2) throw()
|
|
{
|
|
const ScopedLockType lock (getLock());
|
|
|
|
if (isPositiveAndBelow (index1, numUsed)
|
|
&& isPositiveAndBelow (index2, numUsed))
|
|
{
|
|
swapVariables (data.elements [index1],
|
|
data.elements [index2]);
|
|
}
|
|
}
|
|
|
|
/** Moves one of the objects to a different position.
|
|
|
|
This will move the object to a specified index, shuffling along
|
|
any intervening elements as required.
|
|
|
|
So for example, if you have the array { 0, 1, 2, 3, 4, 5 } then calling
|
|
move (2, 4) would result in { 0, 1, 3, 4, 2, 5 }.
|
|
|
|
@param currentIndex the index of the object to be moved. If this isn't a
|
|
valid index, then nothing will be done
|
|
@param newIndex the index at which you'd like this object to end up. If this
|
|
is less than zero, it will be moved to the end of the array
|
|
*/
|
|
void move (const int currentIndex,
|
|
int newIndex) throw()
|
|
{
|
|
if (currentIndex != newIndex)
|
|
{
|
|
const ScopedLockType lock (getLock());
|
|
|
|
if (isPositiveAndBelow (currentIndex, numUsed))
|
|
{
|
|
if (! isPositiveAndBelow (newIndex, numUsed))
|
|
newIndex = numUsed - 1;
|
|
|
|
ObjectClass* const value = data.elements [currentIndex];
|
|
|
|
if (newIndex > currentIndex)
|
|
{
|
|
memmove (data.elements + currentIndex,
|
|
data.elements + currentIndex + 1,
|
|
(newIndex - currentIndex) * sizeof (ObjectClass*));
|
|
}
|
|
else
|
|
{
|
|
memmove (data.elements + newIndex + 1,
|
|
data.elements + newIndex,
|
|
(currentIndex - newIndex) * sizeof (ObjectClass*));
|
|
}
|
|
|
|
data.elements [newIndex] = value;
|
|
}
|
|
}
|
|
}
|
|
|
|
/** This swaps the contents of this array with those of another array.
|
|
|
|
If you need to exchange two arrays, this is vastly quicker than using copy-by-value
|
|
because it just swaps their internal pointers.
|
|
*/
|
|
void swapWithArray (OwnedArray& otherArray) throw()
|
|
{
|
|
const ScopedLockType lock1 (getLock());
|
|
const ScopedLockType lock2 (otherArray.getLock());
|
|
|
|
data.swapWith (otherArray.data);
|
|
swapVariables (numUsed, otherArray.numUsed);
|
|
}
|
|
|
|
//==============================================================================
|
|
/** Reduces the amount of storage being used by the array.
|
|
|
|
Arrays typically allocate slightly more storage than they need, and after
|
|
removing elements, they may have quite a lot of unused space allocated.
|
|
This method will reduce the amount of allocated storage to a minimum.
|
|
*/
|
|
void minimiseStorageOverheads() throw()
|
|
{
|
|
const ScopedLockType lock (getLock());
|
|
data.shrinkToNoMoreThan (numUsed);
|
|
}
|
|
|
|
/** Increases the array's internal storage to hold a minimum number of elements.
|
|
|
|
Calling this before adding a large known number of elements means that
|
|
the array won't have to keep dynamically resizing itself as the elements
|
|
are added, and it'll therefore be more efficient.
|
|
*/
|
|
void ensureStorageAllocated (const int minNumElements) throw()
|
|
{
|
|
const ScopedLockType lock (getLock());
|
|
data.ensureAllocatedSize (minNumElements);
|
|
}
|
|
|
|
//==============================================================================
|
|
/** Sorts the elements in the array.
|
|
|
|
This will use a comparator object to sort the elements into order. The object
|
|
passed must have a method of the form:
|
|
@code
|
|
int compareElements (ElementType first, ElementType second);
|
|
@endcode
|
|
|
|
..and this method must return:
|
|
- a value of < 0 if the first comes before the second
|
|
- a value of 0 if the two objects are equivalent
|
|
- a value of > 0 if the second comes before the first
|
|
|
|
To improve performance, the compareElements() method can be declared as static or const.
|
|
|
|
@param comparator the comparator to use for comparing elements.
|
|
@param retainOrderOfEquivalentItems if this is true, then items
|
|
which the comparator says are equivalent will be
|
|
kept in the order in which they currently appear
|
|
in the array. This is slower to perform, but may
|
|
be important in some cases. If it's false, a faster
|
|
algorithm is used, but equivalent elements may be
|
|
rearranged.
|
|
@see sortArray, indexOfSorted
|
|
*/
|
|
template <class ElementComparator>
|
|
void sort (ElementComparator& comparator,
|
|
const bool retainOrderOfEquivalentItems = false) const throw()
|
|
{
|
|
(void) comparator; // if you pass in an object with a static compareElements() method, this
|
|
// avoids getting warning messages about the parameter being unused
|
|
|
|
const ScopedLockType lock (getLock());
|
|
sortArray (comparator, data.elements.getData(), 0, size() - 1, retainOrderOfEquivalentItems);
|
|
}
|
|
|
|
//==============================================================================
|
|
/** Returns the CriticalSection that locks this array.
|
|
To lock, you can call getLock().enter() and getLock().exit(), or preferably use
|
|
an object of ScopedLockType as an RAII lock for it.
|
|
*/
|
|
inline const TypeOfCriticalSectionToUse& getLock() const throw() { return data; }
|
|
|
|
/** Returns the type of scoped lock to use for locking this array */
|
|
typedef typename TypeOfCriticalSectionToUse::ScopedLockType ScopedLockType;
|
|
|
|
|
|
private:
|
|
//==============================================================================
|
|
ArrayAllocationBase <ObjectClass*, TypeOfCriticalSectionToUse> data;
|
|
int numUsed;
|
|
|
|
JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (OwnedArray);
|
|
};
|
|
|
|
|
|
#endif // __JUCE_OWNEDARRAY_JUCEHEADER__
|