QIntrusiveList< N, member > Class Template Reference

The QIntrusiveList class is a template class that provides a list of objects using static storage. More...

#include <qintrusivelist_p.h>

Collaboration diagram for QIntrusiveList< N, member >:

Classes
class	iterator

Public Types
using	const_iterator = iterator_impl<const N *>
using	Iterator = iterator
using	ConstIterator = const_iterator

Public Member Functions
	~QIntrusiveList ()
	Destroy the list.
bool	isEmpty () const
void	insert (N *n)
	Insert object into the list.
void	remove (N *n)
	Remove object from the list.
bool	contains (const N *n) const
	Returns true if the list contains object; otherwise returns false.
const N *	first () const
	Returns the first entry in this list, or null if the list is empty.
N *	first ()
iterator	begin ()
	Returns an STL-style interator pointing to the first item in the list.
iterator	end ()
	Returns an STL-style iterator pointing to the imaginary item after the last item in the list.
const_iterator	begin () const
const_iterator	end () const

Static Public Member Functions
template<typename O >
static O	next (O current)
	Returns the next object after current, or null if current is the last object.

Detailed Description

template<class N, QIntrusiveListNode N::* member>
class QIntrusiveList< N, member >

The QIntrusiveList class is a template class that provides a list of objects using static storage.

QIntrusiveList creates a linked list of objects. Adding and removing objects from the QIntrusiveList is a constant time operation and is very quick. The list performs no memory allocations, but does require the objects being added to the list to contain a QIntrusiveListNode instance for the list's use. Even so, for small lists QIntrusiveList uses less memory than Qt's other list classes.

As QIntrusiveList uses storage inside the objects in the list, each object can only be in one list at a time. Objects are inserted by the insert() method. If the object is already in a list (including the one it is being inserted into) it is first removed, and then inserted at the head of the list. QIntrusiveList is a last-in-first-out list. That is, following an insert() the inserted object becomes the list's first() object.

struct MyObject {
    MyObject(int value) : value(value) {}
 
    int value;
    QIntrusiveListNode node;
};
typedef QIntrusiveList<MyObject, &MyObject::node> MyObjectList;
 
void foo() {
    MyObjectList list;
 
    MyObject m0(0);
    MyObject m1(1);
    MyObject m2(2);
 
    list.insert(&m0);
    list.insert(&m1);
    list.insert(&m2);
 
    // QIntrusiveList is LIFO, so will print: 2... 1... 0...
    for (MyObjectList::iterator iter = list.begin(); iter != list.end(); ++iter) {
        qWarning() << iter->value;
    }
}

Definition at line 46 of file qintrusivelist_p.h.

Member Typedef Documentation

const_iterator

template<class N , QIntrusiveListNode N::* member>

using QIntrusiveList< N, member >::const_iterator = iterator_impl<const N *>

Definition at line 85 of file qintrusivelist_p.h.

ConstIterator

template<class N , QIntrusiveListNode N::* member>

using QIntrusiveList< N, member >::ConstIterator = const_iterator

Definition at line 88 of file qintrusivelist_p.h.

Iterator

template<class N , QIntrusiveListNode N::* member>

using QIntrusiveList< N, member >::Iterator = iterator

Definition at line 87 of file qintrusivelist_p.h.

Constructor & Destructor Documentation

~QIntrusiveList()

template<class N , QIntrusiveListNode N::* member>

QIntrusiveList< N, member >::~QIntrusiveList ( )

inline

Destroy the list.

All entries are removed.

Definition at line 90 of file qintrusivelist_p.h.

References QIntrusiveListNode::remove().

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Member Function Documentation

begin() [1/2]

template<class N , QIntrusiveListNode N::* member>

iterator QIntrusiveList< N, member >::begin ( )

inline

Returns an STL-style interator pointing to the first item in the list.

See also

end()

Definition at line 132 of file qintrusivelist_p.h.

Referenced by QQuickDragGrabber::begin(), QQmlDelegateModelGroupPrivate::createdPackage(), QQmlDelegateModelGroupPrivate::destroyingPackage(), QQmlDelegateModelGroupPrivate::emitModelUpdated(), QQmlDelegateModelGroupPrivate::initPackage(), QSGDistanceFieldGlyphCache::setGlyphsPosition(), and QSGDistanceFieldGlyphCache::setGlyphsTexture().

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begin() [2/2]

template<class N , QIntrusiveListNode N::* member>

const_iterator QIntrusiveList< N, member >::begin ( ) const

inline

Definition at line 135 of file qintrusivelist_p.h.

contains()

template<class N , QIntrusiveListNode N::* member>

bool QIntrusiveList< N, member >::contains ( const N * n ) const

inline

Returns true if the list contains object; otherwise returns false.

Definition at line 111 of file qintrusivelist_p.h.

end() [1/2]

template<class N , QIntrusiveListNode N::* member>

iterator QIntrusiveList< N, member >::end ( )

inline

Returns an STL-style iterator pointing to the imaginary item after the last item in the list.

See also

begin()

Definition at line 133 of file qintrusivelist_p.h.

Referenced by QQmlDelegateModelGroupPrivate::createdPackage(), QQmlDelegateModelGroupPrivate::destroyingPackage(), QQmlDelegateModelGroupPrivate::emitModelUpdated(), QQuickDragGrabber::end(), QQmlDelegateModelGroupPrivate::initPackage(), QSGDistanceFieldGlyphCache::setGlyphsPosition(), and QSGDistanceFieldGlyphCache::setGlyphsTexture().

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end() [2/2]

template<class N , QIntrusiveListNode N::* member>

const_iterator QIntrusiveList< N, member >::end ( ) const

inline

Definition at line 140 of file qintrusivelist_p.h.

first() [1/2]

template<class N , QIntrusiveListNode N::* member>

N * QIntrusiveList< N, member >::first ( )

inline

Definition at line 123 of file qintrusivelist_p.h.

first() [2/2]

template<class N , QIntrusiveListNode N::* member>

N * QIntrusiveList< N, member >::first ( ) const

inline

Returns the first entry in this list, or null if the list is empty.

Definition at line 122 of file qintrusivelist_p.h.

Referenced by QQuickDragGrabber::~QQuickDragGrabber(), QQmlIncubatorPrivate::clear(), QQmlIncubatorPrivate::forceCompletion(), and QQuickDragGrabber::target().

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insert()

template<class N , QIntrusiveListNode N::* member>

void QIntrusiveList< N, member >::insert ( N * object )

inline

Insert object into the list.

If object is a member of this, or another list, it will be removed and inserted at the head of this list.

Definition at line 94 of file qintrusivelist_p.h.

References QIntrusiveListNode::remove().

Referenced by QQuickDragGrabber::grab().

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isEmpty()

template<class N , QIntrusiveListNode N::* member>

bool QIntrusiveList< N, member >::isEmpty ( ) const

inline

Definition at line 92 of file qintrusivelist_p.h.

Referenced by QQuickDragGrabber::~QQuickDragGrabber(), QQmlIncubatorPrivate::calculateStatus(), QQmlIncubator::clear(), QQmlIncubatorPrivate::forceCompletion(), QQmlIncubatorPrivate::incubate(), QQuickDragGrabber::isEmpty(), and QQuickDragGrabber::target().

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next()

template<class N , QIntrusiveListNode N::* member>

template<typename O >

N * QIntrusiveList< N, member >::next ( O current )

inlinestatic

Returns the next object after current, or null if current is the last object.

current cannot be null.

Definition at line 126 of file qintrusivelist_p.h.

Referenced by QIntrusiveList< N, member >::iterator::erase().

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remove()

template<class N , QIntrusiveListNode N::* member>

void QIntrusiveList< N, member >::remove ( N * object )

inline

Remove object from the list.

object must not be null.

Definition at line 105 of file qintrusivelist_p.h.

References QIntrusiveListNode::remove().

Referenced by QIntrusiveList< N, member >::iterator::erase().

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The documentation for this class was generated from the following files:

• qtdeclarative/src/qml/qml/ftw/qintrusivelist_p.h (c36627fd5bca381b2a44b83ed065430bb5598836)
• qtdeclarative/src/qml/qml/ftw/qintrusivelist.cpp (0dc4fd240a2897c5c443a0ef6d84c416843e4938)