QFreeListDefaultConstants Struct Reference

#include <qfreelist_p.h>

Inheritance diagram for QFreeListDefaultConstants:

Collaboration diagram for QFreeListDefaultConstants:

Public Types
enum	{   InitialNextValue = 0 , IndexMask = 0x00ffffff , SerialMask = ~IndexMask & ~0x80000000 , SerialCounter = IndexMask + 1 ,   MaxIndex = IndexMask , BlockCount = 4 }

Static Public Attributes
static const int	Sizes [BlockCount]

Detailed Description

Defines default constants used by QFreeList:

• The initial value returned by QFreeList::next() is zero.
• QFreeList allows for up to 16777216 elements in QFreeList and uses the top 8 bits to store a serial counter for ABA protection.
• QFreeList will make a maximum of 4 allocations (blocks), with each successive block larger than the previous.
• Sizes static int[] array to define the size of each block.

It is possible to define your own constants struct/class and give this to QFreeList to customize/tune the behavior.

Definition at line 78 of file qfreelist_p.h.

Member Enumeration Documentation

anonymous enum

anonymous enum

Enumerator
InitialNextValue
IndexMask
SerialMask
SerialCounter
MaxIndex
BlockCount

Definition at line 81 of file qfreelist_p.h.

Member Data Documentation

Sizes

Q_CONSTINIT const int QFreeListDefaultConstants::Sizes

static

Initial value:

= {
    QFreeListDefaultConstantsPrivate::Size0,
    QFreeListDefaultConstantsPrivate::Size1,
    QFreeListDefaultConstantsPrivate::Size2,
    QFreeListDefaultConstantsPrivate::Size3
}

Definition at line 23 of file qfreelist_p.h.

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

• qtbase/src/corelib/tools/qfreelist_p.h (21e9875d62414306fde9738ab255e55f22d1c8ed)
• qtbase/src/corelib/tools/qfreelist.cpp (da5f2fc6be6768275501be6ec3e1b742fb995e9e)