#include <QtCore/qarraydata.h>
#include <QtCore/private/qnumeric_p.h>
#include <QtCore/private/qtools_p.h>
#include <QtCore/qmath.h>
#include <QtCore/qbytearray.h>
#include <QtCore/qstring.h>
#include <stdlib.h>

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Functions
QT_BEGIN_NAMESPACE qsizetype	qCalculateBlockSize (qsizetype elementCount, qsizetype elementSize, qsizetype headerSize) noexcept

CalculateGrowingBlockSizeResult	qCalculateGrowingBlockSize (qsizetype elementCount, qsizetype elementSize, qsizetype headerSize) noexcept

static qsizetype	reserveExtraBytes (qsizetype allocSize)

static qsizetype	calculateBlockSize (qsizetype &capacity, qsizetype objectSize, qsizetype headerSize, QArrayData::AllocationOption option)

static QArrayData *	allocateData (qsizetype allocSize)

Function Documentation

◆ allocateData()

static QArrayData * allocateData ( qsizetype allocSize )

static

Definition at line 140 of file qarraydata.cpp.

References header().

Referenced by QContiguousCache< T >::QContiguousCache(), QArrayData::allocate(), QContiguousCache< T >::clear(), and QContiguousCache< T >::setCapacity().

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◆ calculateBlockSize()

static qsizetype calculateBlockSize	(	qsizetype &	capacity,
		qsizetype	objectSize,
		qsizetype	headerSize,
		QArrayData::AllocationOption	option
	)

inlinestatic

Definition at line 126 of file qarraydata.cpp.

References capacity, QArrayData::Grow, headerSize, qCalculateBlockSize(), and qCalculateGrowingBlockSize().

Referenced by QArrayData::allocate(), and QArrayData::reallocateUnaligned().

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◆ qCalculateBlockSize()

QT_BEGIN_NAMESPACE qsizetype qCalculateBlockSize	(	qsizetype	elementCount,
		qsizetype	elementSize,
		qsizetype	headerSize
	)

noexcept

Since: 5.7

Returns the memory block size for a container containing elementCount elements, each of elementSize bytes, plus a header of headerSize bytes. That is, this function returns {elementCount * elementSize + headerSize}

but unlike the simple calculation, it checks for overflows during the multiplication and the addition.

Both elementCount and headerSize can be zero, but elementSize cannot.

This function returns -1 on overflow or if the memory block size would not fit a qsizetype.

Definition at line 52 of file qarraydata.cpp.

References headerSize, Q_ASSERT, Q_UNLIKELY, qAddOverflow(), and qMulOverflow().

Referenced by calculateBlockSize(), and qCalculateGrowingBlockSize().

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◆ qCalculateGrowingBlockSize()

CalculateGrowingBlockSizeResult qCalculateGrowingBlockSize	(	qsizetype	elementCount,
		qsizetype	elementSize,
		qsizetype	headerSize
	)

noexcept

Since: 5.7

Returns the memory block size and the number of elements that will fit in that block for a container containing elementCount elements, each of elementSize bytes, plus a header of headerSize bytes. This function assumes the container will grow and pre-allocates a growth factor.

Both elementCount and headerSize can be zero, but elementSize cannot.

This function returns -1 on overflow or if the memory block size would not fit a qsizetype.