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/*
==============================================================================
This file is part of the JUCE library.
Copyright (c) 2020 - Raw Material Software Limited
JUCE is an open source library subject to commercial or open-source
licensing.
The code included in this file is provided under the terms of the ISC license
http://www.isc.org/downloads/software-support-policy/isc-license. Permission
To use, copy, modify, and/or distribute this software for any purpose with or
without fee is hereby granted provided that the above copyright notice and
this permission notice appear in all copies.
JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
DISCLAIMED.
==============================================================================
*/
namespace juce
{
//==============================================================================
/**
Implements some basic array storage allocation functions.
This class isn't really for public use - it used to be part of the
container classes but has since been superseded by ArrayBase. Eventually
it will be removed from the API.
@tags{Core}
*/
template <class ElementType, class TypeOfCriticalSectionToUse>
class ArrayAllocationBase : public TypeOfCriticalSectionToUse
{
public:
//==============================================================================
/** Creates an empty array. */
ArrayAllocationBase() = default;
/** Destructor. */
~ArrayAllocationBase() = default;
ArrayAllocationBase (ArrayAllocationBase&& other) noexcept
: elements (std::move (other.elements)),
numAllocated (other.numAllocated)
{
}
ArrayAllocationBase& operator= (ArrayAllocationBase&& other) noexcept
{
elements = std::move (other.elements);
numAllocated = other.numAllocated;
return *this;
}
//==============================================================================
/** Changes the amount of storage allocated.
This will retain any data currently held in the array, and either add or
remove extra space at the end.
@param numElements the number of elements that are needed
*/
void setAllocatedSize (int numElements)
{
if (numAllocated != numElements)
{
if (numElements > 0)
elements.realloc ((size_t) numElements);
else
elements.free();
numAllocated = numElements;
}
}
/** Increases the amount of storage allocated if it is less than a given amount.
This will retain any data currently held in the array, but will add
extra space at the end to make sure there it's at least as big as the size
passed in. If it's already bigger, no action is taken.
@param minNumElements the minimum number of elements that are needed
*/
void ensureAllocatedSize (int minNumElements)
{
if (minNumElements > numAllocated)
setAllocatedSize ((minNumElements + minNumElements / 2 + 8) & ~7);
jassert (numAllocated <= 0 || elements != nullptr);
}
/** Minimises the amount of storage allocated so that it's no more than
the given number of elements.
*/
void shrinkToNoMoreThan (int maxNumElements)
{
if (maxNumElements < numAllocated)
setAllocatedSize (maxNumElements);
}
/** Swap the contents of two objects. */
void swapWith (ArrayAllocationBase& other) noexcept
{
elements.swapWith (other.elements);
std::swap (numAllocated, other.numAllocated);
}
//==============================================================================
HeapBlock<ElementType> elements;
int numAllocated = 0;
private:
JUCE_DECLARE_NON_COPYABLE (ArrayAllocationBase)
};
} // namespace juce
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