qtools_p.h File Reference

(7ce6920aacfcba485cd8017e01c6aeb324292e75)

#include "QtCore/private/qglobal_p.h"
#include <chrono>
#include <limits.h>
#include <time.h>

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Classes
struct	CalculateGrowingBlockSizeResult

Namespaces
namespace	QtMiscUtils

Functions
constexpr char	QtMiscUtils::toHexUpper (char32_t value) noexcept
constexpr char	QtMiscUtils::toHexLower (char32_t value) noexcept
constexpr bool	QtMiscUtils::isHexDigit (char32_t c) noexcept
constexpr int	QtMiscUtils::fromHex (char32_t c) noexcept
constexpr char	QtMiscUtils::toOct (char32_t value) noexcept
constexpr bool	QtMiscUtils::isOctalDigit (char32_t c) noexcept
constexpr int	QtMiscUtils::fromOct (char32_t c) noexcept
constexpr bool	QtMiscUtils::isAsciiDigit (char32_t c) noexcept
constexpr bool	QtMiscUtils::isAsciiUpper (char32_t c) noexcept
constexpr bool	QtMiscUtils::isAsciiLower (char32_t c) noexcept
constexpr bool	QtMiscUtils::isAsciiLetterOrNumber (char32_t c) noexcept
constexpr char	QtMiscUtils::toAsciiLower (char ch) noexcept
constexpr char	QtMiscUtils::toAsciiUpper (char ch) noexcept
constexpr int	QtMiscUtils::caseCompareAscii (char lhs, char rhs) noexcept
constexpr int	QtMiscUtils::isAsciiPrintable (char32_t ch) noexcept
constexpr int	QtMiscUtils::qt_lencmp (qsizetype lhs, qsizetype rhs) noexcept
qsizetype Q_CORE_EXPORT Q_DECL_CONST_FUNCTION	qCalculateBlockSize (qsizetype elementCount, qsizetype elementSize, qsizetype headerSize=0) noexcept
CalculateGrowingBlockSizeResult Q_CORE_EXPORT Q_DECL_CONST_FUNCTION	qCalculateGrowingBlockSize (qsizetype elementCount, qsizetype elementSize, qsizetype headerSize=0) noexcept

Function Documentation

qCalculateBlockSize()

qsizetype Q_CORE_EXPORT Q_DECL_CONST_FUNCTION 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 Q_CORE_EXPORT Q_DECL_CONST_FUNCTION 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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