808 lines
30 KiB
C++
808 lines
30 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2017 - ROLI Ltd.
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JUCE is an open source library subject to commercial or open-source
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licensing.
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The code included in this file is provided under the terms of the ISC license
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http://www.isc.org/downloads/software-support-policy/isc-license. Permission
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To use, copy, modify, and/or distribute this software for any purpose with or
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without fee is hereby granted provided that the above copyright notice and
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this permission notice appear in all copies.
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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{
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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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@tags{Core}
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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() = default;
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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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deleteAllObjects();
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}
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/** Move constructor. */
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OwnedArray (OwnedArray&& other) noexcept
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: values (std::move (other.values))
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{
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}
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/** Creates an array from a list of objects. */
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OwnedArray (const std::initializer_list<ObjectClass*>& items)
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{
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addArray (items);
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}
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/** Move assignment operator. */
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OwnedArray& operator= (OwnedArray&& other) noexcept
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{
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const ScopedLockType lock (getLock());
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deleteAllObjects();
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values = std::move (other.values);
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return *this;
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}
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/** Converting move constructor. */
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template <class OtherObjectClass, class OtherCriticalSection>
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OwnedArray (OwnedArray<OtherObjectClass, OtherCriticalSection>&& other) noexcept
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: values (std::move (other.values))
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{
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}
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/** Converting move assignment operator. */
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template <class OtherObjectClass, class OtherCriticalSection>
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OwnedArray& operator= (OwnedArray<OtherObjectClass, OtherCriticalSection>&& other) noexcept
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{
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const ScopedLockType lock (getLock());
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deleteAllObjects();
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values = std::move (other.values);
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return *this;
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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 (bool deleteObjects = true)
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{
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const ScopedLockType lock (getLock());
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clearQuick (deleteObjects);
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values.setAllocatedSize (0);
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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 clearQuick (bool deleteObjects)
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{
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const ScopedLockType lock (getLock());
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if (deleteObjects)
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deleteAllObjects();
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else
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values.clear();
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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 noexcept
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{
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return values.size();
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}
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/** Returns true if the array is empty, false otherwise. */
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inline bool isEmpty() const noexcept
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{
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return size() == 0;
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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 noexcept
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{
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const ScopedLockType lock (getLock());
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return values.getValueWithDefault (index);
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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 is always going to be legal.
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*/
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inline ObjectClass* getUnchecked (const int index) const noexcept
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{
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const ScopedLockType lock (getLock());
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return values[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 noexcept
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{
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const ScopedLockType lock (getLock());
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return values.getFirst();
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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 noexcept
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{
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const ScopedLockType lock (getLock());
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return values.getLast();
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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() noexcept
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{
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return values.begin();
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}
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//==============================================================================
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/** Returns a pointer to the first element in the array.
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This method is provided for compatibility with standard C++ iteration mechanisms.
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*/
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inline ObjectClass** begin() const noexcept
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{
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return values.begin();
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}
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/** Returns a pointer to the element which follows the last element in the array.
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This method is provided for compatibility with standard C++ iteration mechanisms.
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*/
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inline ObjectClass** end() const noexcept
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{
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return values.end();
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}
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/** Returns a pointer to the first element in the array.
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This method is provided for compatibility with the standard C++ containers.
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*/
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inline ObjectClass** data() const noexcept
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{
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return begin();
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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* objectToLookFor) const noexcept
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{
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const ScopedLockType lock (getLock());
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auto** e = values.begin();
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for (; e != values.end(); ++e)
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if (objectToLookFor == *e)
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return static_cast<int> (e - values.begin());
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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* objectToLookFor) const noexcept
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{
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const ScopedLockType lock (getLock());
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auto** e = values.begin();
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for (; e != values.end(); ++e)
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if (objectToLookFor == *e)
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return true;
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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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@returns the new object that was added
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@see set, insert, addIfNotAlreadyThere, addSorted
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*/
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ObjectClass* add (ObjectClass* newObject) noexcept
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{
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const ScopedLockType lock (getLock());
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values.add (newObject);
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return 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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@returns the new object that was added
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@see add, addSorted, addIfNotAlreadyThere, set
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*/
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ObjectClass* insert (int indexToInsertAt, ObjectClass* newObject) noexcept
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{
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const ScopedLockType lock (getLock());
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values.insert (indexToInsertAt, newObject, 1);
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return newObject;
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}
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/** Inserts an array of values into this array at a given position.
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If the index is less than 0 or greater than the size of the array, the
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new elements will be added to the end of the array.
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Otherwise, they will be inserted into the array, moving all the later elements
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along to make room.
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@param indexToInsertAt the index at which the first new element should be inserted
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@param newObjects the new values to add to the array
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@param numberOfElements how many items are in the array
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@see insert, add, addSorted, set
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*/
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void insertArray (int indexToInsertAt,
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ObjectClass* const* newObjects,
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int numberOfElements)
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{
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if (numberOfElements > 0)
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{
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const ScopedLockType lock (getLock());
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values.insertArray (indexToInsertAt, newObjects, numberOfElements);
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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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@returns true if the new object was added, false otherwise
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*/
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bool addIfNotAlreadyThere (ObjectClass* newObject) noexcept
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{
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const ScopedLockType lock (getLock());
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if (contains (newObject))
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return false;
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add (newObject);
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return true;
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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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ObjectClass* set (int indexToChange, ObjectClass* newObject, bool deleteOldElement = true)
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{
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if (indexToChange >= 0)
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{
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std::unique_ptr<ObjectClass> toDelete;
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{
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const ScopedLockType lock (getLock());
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if (indexToChange < values.size())
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{
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if (deleteOldElement)
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{
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toDelete.reset (values[indexToChange]);
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if (toDelete.get() == newObject)
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toDelete.release();
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}
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values[indexToChange] = newObject;
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}
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else
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{
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values.add (newObject);
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}
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}
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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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return newObject;
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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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values.addArray (arrayToAddFrom, startIndex, numElementsToAdd);
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}
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/** Adds elements from another array to the end of this array. */
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template <typename OtherArrayType>
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void addArray (const std::initializer_list<OtherArrayType>& items)
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{
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const ScopedLockType lock (getLock());
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values.addArray (items);
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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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jassert (numElementsToAdd >= 0);
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values.ensureAllocatedSize (values.size() + numElementsToAdd);
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while (--numElementsToAdd >= 0)
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values.add (createCopyIfNotNull (arrayToAddFrom.getUnchecked (startIndex++)));
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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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@returns the index at which the new object was added
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@see add, sort, indexOfSorted
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*/
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template <class ElementComparator>
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int addSorted (ElementComparator& comparator, ObjectClass* const newObject) noexcept
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{
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// 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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ignoreUnused (comparator);
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const ScopedLockType lock (getLock());
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const int index = findInsertIndexInSortedArray (comparator, values.begin(), newObject, 0, values.size());
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insert (index, newObject);
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return index;
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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 <typename ElementComparator>
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int indexOfSorted (ElementComparator& comparator, const ObjectClass* const objectToLookFor) const noexcept
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{
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// 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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ignoreUnused (comparator);
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const ScopedLockType lock (getLock());
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int s = 0, e = values.size();
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while (s < e)
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{
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if (comparator.compareElements (objectToLookFor, values[s]) == 0)
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return s;
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auto halfway = (s + e) / 2;
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if (halfway == s)
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break;
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if (comparator.compareElements (objectToLookFor, values[halfway]) >= 0)
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s = halfway;
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else
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e = halfway;
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}
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return -1;
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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 (int indexToRemove, bool deleteObject = true)
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{
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std::unique_ptr<ObjectClass> toDelete;
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{
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const ScopedLockType lock (getLock());
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if (isPositiveAndBelow (indexToRemove, values.size()))
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{
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auto** e = values.begin() + indexToRemove;
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if (deleteObject)
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toDelete.reset (*e);
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values.removeElements (indexToRemove, 1);
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}
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}
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if ((values.size() << 1) < values.capacity())
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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 (int indexToRemove)
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|
{
|
|
ObjectClass* removedItem = nullptr;
|
|
const ScopedLockType lock (getLock());
|
|
|
|
if (isPositiveAndBelow (indexToRemove, values.size()))
|
|
{
|
|
removedItem = values[indexToRemove];
|
|
|
|
values.removeElements (indexToRemove, 1);
|
|
|
|
if ((values.size() << 1) < values.capacity())
|
|
minimiseStorageOverheads();
|
|
}
|
|
|
|
return removedItem;
|
|
}
|
|
|
|
/** Removes a specified object from the array.
|
|
|
|
If the item isn't found, no action is taken.
|
|
|
|
@param objectToRemove the object to try to remove
|
|
@param deleteObject whether to delete the object (if it's found)
|
|
@see remove, removeRange
|
|
*/
|
|
void removeObject (const ObjectClass* objectToRemove, bool deleteObject = true)
|
|
{
|
|
const ScopedLockType lock (getLock());
|
|
|
|
for (int i = 0; i < values.size(); ++i)
|
|
{
|
|
if (objectToRemove == values[i])
|
|
{
|
|
remove (i, deleteObject);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/** 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, int numberToRemove, bool deleteObjects = true)
|
|
{
|
|
const ScopedLockType lock (getLock());
|
|
auto endIndex = jlimit (0, values.size(), startIndex + numberToRemove);
|
|
startIndex = jlimit (0, values.size(), startIndex);
|
|
numberToRemove = endIndex - startIndex;
|
|
|
|
if (numberToRemove > 0)
|
|
{
|
|
if (deleteObjects)
|
|
{
|
|
for (int i = startIndex; i < endIndex; ++i)
|
|
{
|
|
ContainerDeletePolicy<ObjectClass>::destroy (values[i]);
|
|
values[i] = nullptr; // (in case one of the destructors accesses this array and hits a dangling pointer)
|
|
}
|
|
}
|
|
|
|
values.removeElements (startIndex, numberToRemove);
|
|
|
|
if ((values.size() << 1) < values.capacity())
|
|
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,
|
|
bool deleteObjects = true)
|
|
{
|
|
const ScopedLockType lock (getLock());
|
|
|
|
if (howManyToRemove >= values.size())
|
|
clear (deleteObjects);
|
|
else
|
|
removeRange (values.size() - 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 (int index1, int index2) noexcept
|
|
{
|
|
const ScopedLockType lock (getLock());
|
|
values.swap (index1, 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 (int currentIndex, int newIndex) noexcept
|
|
{
|
|
if (currentIndex != newIndex)
|
|
{
|
|
const ScopedLockType lock (getLock());
|
|
values.move (currentIndex, newIndex);
|
|
}
|
|
}
|
|
|
|
/** 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.
|
|
*/
|
|
template <class OtherArrayType>
|
|
void swapWith (OtherArrayType& otherArray) noexcept
|
|
{
|
|
const ScopedLockType lock1 (getLock());
|
|
const typename OtherArrayType::ScopedLockType lock2 (otherArray.getLock());
|
|
values.swapWith (otherArray.values);
|
|
}
|
|
|
|
//==============================================================================
|
|
/** 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() noexcept
|
|
{
|
|
const ScopedLockType lock (getLock());
|
|
values.shrinkToNoMoreThan (values.size());
|
|
}
|
|
|
|
/** 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) noexcept
|
|
{
|
|
const ScopedLockType lock (getLock());
|
|
values.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,
|
|
bool retainOrderOfEquivalentItems = false) const noexcept
|
|
{
|
|
// If you pass in an object with a static compareElements() method, this
|
|
// avoids getting warning messages about the parameter being unused
|
|
ignoreUnused (comparator);
|
|
|
|
const ScopedLockType lock (getLock());
|
|
|
|
if (size() > 1)
|
|
sortArray (comparator, values.begin(), 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 noexcept { return values; }
|
|
|
|
/** Returns the type of scoped lock to use for locking this array */
|
|
using ScopedLockType = typename TypeOfCriticalSectionToUse::ScopedLockType;
|
|
|
|
//==============================================================================
|
|
#ifndef DOXYGEN
|
|
// Note that the swapWithArray method has been replaced by a more flexible templated version,
|
|
// and renamed "swapWith" to be more consistent with the names used in other classes.
|
|
JUCE_DEPRECATED_WITH_BODY (void swapWithArray (OwnedArray& other) noexcept, { swapWith (other); })
|
|
#endif
|
|
|
|
private:
|
|
//==============================================================================
|
|
ArrayBase <ObjectClass*, TypeOfCriticalSectionToUse> values;
|
|
|
|
void deleteAllObjects()
|
|
{
|
|
for (auto& e : values)
|
|
ContainerDeletePolicy<ObjectClass>::destroy (e);
|
|
|
|
values.clear();
|
|
}
|
|
|
|
template <class OtherObjectClass, class OtherCriticalSection>
|
|
friend class OwnedArray;
|
|
|
|
JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (OwnedArray)
|
|
};
|
|
|
|
} // namespace juce
|