Qt 6.x
The Qt SDK
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Public Types | Static Public Attributes | List of all members
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:
= {
Size0,
Size1,
Size2,
Size3
}

Definition at line 90 of file qfreelist_p.h.

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