qarraydata.cpp File Reference

(95c7f88132646489bc17b8ea32facd76a19e19fa)

#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 CalculateGrowingBlockSizeResult	calculateBlockSize (qsizetype capacity, qsizetype objectSize, qsizetype headerSize, QArrayData::AllocationOption option)
static QArrayData *	allocateData (qsizetype allocSize)
static AllocationResult	allocateHelper (qsizetype objectSize, qsizetype alignment, qsizetype capacity, QArrayData::AllocationOption option) noexcept

Function Documentation

allocateData()

static QArrayData * allocateData ( qsizetype allocSize )

static

Definition at line 137 of file qarraydata.cpp.

References header().

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

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allocateHelper()

static AllocationResult allocateHelper ( qsizetype objectSize, qsizetype alignment, qsizetype capacity, QArrayData::AllocationOption option )

inlinestaticnoexcept

Definition at line 157 of file qarraydata.cpp.

References alignment, allocateData(), blockSize, calculateBlockSize(), capacity, QTypedArrayData< T >::dataStart(), header(), headerSize, Q_ASSERT, and Q_UNLIKELY.

Referenced by QArrayData::allocate(), QArrayData::allocate1(), and QArrayData::allocate2().

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calculateBlockSize()

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

inlinestatic

Definition at line 119 of file qarraydata.cpp.

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

Referenced by allocateHelper(), 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.

Note

The memory block may contain up to elementSize - 1 bytes more than needed.

Definition at line 85 of file qarraydata.cpp.

References headerSize, Q_UNLIKELY, qCalculateBlockSize(), and qNextPowerOfTwo().

Referenced by calculateBlockSize().

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