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120 lines
4.2 KiB
C++
120 lines
4.2 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 2004-11 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_ARRAYALLOCATIONBASE_JUCEHEADER__
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#define __JUCE_ARRAYALLOCATIONBASE_JUCEHEADER__
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#include "../memory/juce_HeapBlock.h"
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//==============================================================================
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/**
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Implements some basic array storage allocation functions.
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This class isn't really for public use - it's used by the other
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array classes, but might come in handy for some purposes.
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It inherits from a critical section class to allow the arrays to use
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the "empty base class optimisation" pattern to reduce their footprint.
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@see Array, OwnedArray, ReferenceCountedArray
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*/
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template <class ElementType, class TypeOfCriticalSectionToUse>
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class ArrayAllocationBase : public TypeOfCriticalSectionToUse
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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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ArrayAllocationBase() throw()
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: numAllocated (0)
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{
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}
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/** Destructor. */
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~ArrayAllocationBase()
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{
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}
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//==============================================================================
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/** Changes the amount of storage allocated.
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This will retain any data currently held in the array, and either add or
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remove extra space at the end.
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@param numElements the number of elements that are needed
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*/
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void setAllocatedSize (const int numElements)
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{
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if (numAllocated != numElements)
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{
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if (numElements > 0)
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elements.realloc (numElements);
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else
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elements.free();
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numAllocated = numElements;
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}
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}
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/** Increases the amount of storage allocated if it is less than a given amount.
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This will retain any data currently held in the array, but will add
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extra space at the end to make sure there it's at least as big as the size
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passed in. If it's already bigger, no action is taken.
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@param minNumElements the minimum number of elements that are needed
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*/
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void ensureAllocatedSize (const int minNumElements)
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{
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if (minNumElements > numAllocated)
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setAllocatedSize ((minNumElements + minNumElements / 2 + 8) & ~7);
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}
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/** Minimises the amount of storage allocated so that it's no more than
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the given number of elements.
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*/
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void shrinkToNoMoreThan (const int maxNumElements)
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{
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if (maxNumElements < numAllocated)
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setAllocatedSize (maxNumElements);
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}
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/** Swap the contents of two objects. */
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void swapWith (ArrayAllocationBase <ElementType, TypeOfCriticalSectionToUse>& other) throw()
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{
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elements.swapWith (other.elements);
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std::swap (numAllocated, other.numAllocated);
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}
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//==============================================================================
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HeapBlock <ElementType> elements;
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int numAllocated;
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private:
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JUCE_DECLARE_NON_COPYABLE (ArrayAllocationBase);
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};
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#endif // __JUCE_ARRAYALLOCATIONBASE_JUCEHEADER__
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