#include <QtCore/qstring.h>
#include <QtCore/qstringfwd.h>
#include <QtCore/qpair.h>
#include <numeric>
#include <functional>

Include dependency graph for qhashfunctions.h:

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Classes
class	QHashSeed
	\inmodule QtCore More...

struct	QtPrivate::QHashCombine

struct	QtPrivate::QHashCombineCommutative

struct	QtPrivate::QNothrowHashable< T, Enable >

struct	QtPrivate::QNothrowHashable< T, std::enable_if_t< QNothrowHashableHelper_v< T > > >

Namespaces
namespace	QHashPrivate

namespace	QtPrivate
	\macro QT_NAMESPACE

Macros
#define	QT_SPECIALIZE_STD_HASH_TO_CALL_QHASH(Class, Arguments)

#define	QT_SPECIALIZE_STD_HASH_TO_CALL_QHASH_BY_CREF(Class) QT_SPECIALIZE_STD_HASH_TO_CALL_QHASH(Class, const argument_type &)

#define	QT_SPECIALIZE_STD_HASH_TO_CALL_QHASH_BY_VALUE(Class) QT_SPECIALIZE_STD_HASH_TO_CALL_QHASH(Class, argument_type)

Typedefs
template<typename... T>
using	QtPrivate::QHashMultiReturnType = decltype(std::declval< std::enable_if_t<(sizeof...(T) > 0)> >(),(qHash(std::declval< const T & >()),...), size_t{})

Functions
Q_DECL_CONST_FUNCTION constexpr size_t	QHashPrivate::hash (size_t key, size_t seed) noexcept

template<typename T1 , typename T2 >
static constexpr bool	QHashPrivate::noexceptPairHash ()

Q_CORE_EXPORT Q_DECL_PURE_FUNCTION size_t	qHashBits (const void *p, size_t size, size_t seed=0) noexcept

template<typename T1 , typename T2 >
size_t	qHash (const std::pair< T1, T2 > &key, size_t seed=0) noexcept(QHashPrivate::noexceptPairHash< T1, T2 >())

Q_DECL_CONST_FUNCTION constexpr size_t	qHash (char key, size_t seed=0) noexcept

Q_DECL_CONST_FUNCTION constexpr size_t	qHash (uchar key, size_t seed=0) noexcept

Q_DECL_CONST_FUNCTION constexpr size_t	qHash (signed char key, size_t seed=0) noexcept

Q_DECL_CONST_FUNCTION constexpr size_t	qHash (ushort key, size_t seed=0) noexcept

Q_DECL_CONST_FUNCTION constexpr size_t	qHash (short key, size_t seed=0) noexcept

Q_DECL_CONST_FUNCTION constexpr size_t	qHash (uint key, size_t seed=0) noexcept

Q_DECL_CONST_FUNCTION constexpr size_t	qHash (int key, size_t seed=0) noexcept

Q_DECL_CONST_FUNCTION constexpr size_t	qHash (ulong key, size_t seed=0) noexcept

Q_DECL_CONST_FUNCTION constexpr size_t	qHash (long key, size_t seed=0) noexcept

Q_DECL_CONST_FUNCTION constexpr size_t	qHash (quint64 key, size_t seed=0) noexcept

Q_DECL_CONST_FUNCTION constexpr size_t	qHash (qint64 key, size_t seed=0) noexcept

Q_DECL_CONST_FUNCTION size_t	qHash (float key, size_t seed=0) noexcept

Q_CORE_EXPORT Q_DECL_CONST_FUNCTION size_t	qHash (double key, size_t seed=0) noexcept

Q_CORE_EXPORT Q_DECL_CONST_FUNCTION size_t	qHash (long double key, size_t seed=0) noexcept

Q_DECL_CONST_FUNCTION constexpr size_t	qHash (wchar_t key, size_t seed=0) noexcept

Q_DECL_CONST_FUNCTION constexpr size_t	qHash (char16_t key, size_t seed=0) noexcept

Q_DECL_CONST_FUNCTION constexpr size_t	qHash (char32_t key, size_t seed=0) noexcept

template<class T >
size_t	qHash (const T *key, size_t seed=0) noexcept

Q_DECL_CONST_FUNCTION constexpr size_t	qHash (std::nullptr_t, size_t seed=0) noexcept

template<class Enum , std::enable_if_t< std::is_enum_v< Enum >, bool > = true>
Q_DECL_CONST_FUNCTION constexpr size_t	qHash (Enum e, size_t seed=0) noexcept

Q_DECL_CONST_FUNCTION constexpr size_t	qHash (const QChar key, size_t seed=0) noexcept

Q_CORE_EXPORT Q_DECL_PURE_FUNCTION size_t	qHash (QByteArrayView key, size_t seed=0) noexcept

Q_DECL_PURE_FUNCTION size_t	qHash (const QByteArray &key, size_t seed=0 QT6_DECL_NEW_OVERLOAD_TAIL) noexcept

Q_CORE_EXPORT Q_DECL_PURE_FUNCTION size_t	qHash (QStringView key, size_t seed=0) noexcept

Q_DECL_PURE_FUNCTION size_t	qHash (const QString &key, size_t seed=0) noexcept

Q_CORE_EXPORT Q_DECL_PURE_FUNCTION size_t	qHash (const QBitArray &key, size_t seed=0) noexcept

Q_CORE_EXPORT Q_DECL_PURE_FUNCTION size_t	qHash (QLatin1StringView key, size_t seed=0) noexcept

Q_DECL_CONST_FUNCTION constexpr size_t	qHash (QKeyCombination key, size_t seed=0) noexcept

Q_CORE_EXPORT Q_DECL_PURE_FUNCTION uint	qt_hash (QStringView key, uint chained=0) noexcept

template<typename Enum >
Q_DECL_CONST_FUNCTION constexpr size_t	qHash (QFlags< Enum > flags, size_t seed=0) noexcept

template<typename T >
bool	qHashEquals (const T &a, const T &b)

template<typename... T>
constexpr QtPrivate::QHashMultiReturnType< T... >	qHashMulti (size_t seed, const T &... args) noexcept(std::conjunction_v< QtPrivate::QNothrowHashable< T >... >)

template<typename... T>
constexpr QtPrivate::QHashMultiReturnType< T... >	qHashMultiCommutative (size_t seed, const T &... args) noexcept(std::conjunction_v< QtPrivate::QNothrowHashable< T >... >)

template<typename InputIterator >
size_t	qHashRange (InputIterator first, InputIterator last, size_t seed=0) noexcept(noexcept(qHash(*first)))

template<typename InputIterator >
size_t	qHashRangeCommutative (InputIterator first, InputIterator last, size_t seed=0) noexcept(noexcept(qHash(*first)))

Variables
template<typename T >
constexpr bool	QtPrivate::QNothrowHashableHelper_v = noexcept(qHash(std::declval<const T &>()))

template<typename T >
constexpr bool	QtPrivate::QNothrowHashable_v = QNothrowHashable<T>::value

Macro Definition Documentation

◆ QT_SPECIALIZE_STD_HASH_TO_CALL_QHASH

#define QT_SPECIALIZE_STD_HASH_TO_CALL_QHASH	(	Class,
		Arguments
	)

Value:

    QT_BEGIN_INCLUDE_NAMESPACE                                      \
    namespace std {                                                 \
        template <>                                                 \
        struct hash< QT_PREPEND_NAMESPACE(Class) > {                \
            using argument_type = QT_PREPEND_NAMESPACE(Class);      \
            using result_type = size_t;                             \
            size_t operator()(Arguments s) const                    \
              noexcept(QT_PREPEND_NAMESPACE(                        \
                     QtPrivate::QNothrowHashable_v)<argument_type>) \
            {                                                       \
                /* this seeds qHash with the result of */           \
                /* std::hash applied to an int, to reap */          \
                /* any protection against predictable hash */       \
                /* values the std implementation may provide */     \
                using QT_PREPEND_NAMESPACE(qHash);                  \
                return qHash(s, qHash(std::hash<int>{}(0)));        \
            }                                                       \
        };                                                          \
    }                                                               \
    QT_END_INCLUDE_NAMESPACE                                        \
    /*end*/

Definition at line 296 of file qhashfunctions.h.

◆ QT_SPECIALIZE_STD_HASH_TO_CALL_QHASH_BY_CREF

#define QT_SPECIALIZE_STD_HASH_TO_CALL_QHASH_BY_CREF ( Class ) QT_SPECIALIZE_STD_HASH_TO_CALL_QHASH(Class, const argument_type &)

Definition at line 319 of file qhashfunctions.h.

◆ QT_SPECIALIZE_STD_HASH_TO_CALL_QHASH_BY_VALUE

#define QT_SPECIALIZE_STD_HASH_TO_CALL_QHASH_BY_VALUE ( Class ) QT_SPECIALIZE_STD_HASH_TO_CALL_QHASH(Class, argument_type)

Definition at line 321 of file qhashfunctions.h.

Function Documentation

◆ qHash() [1/30]

Q_DECL_CONST_FUNCTION constexpr size_t qHash	(	char	key,
		size_t	seed = `0`
	)

◆ qHash() [2/30]

Q_DECL_CONST_FUNCTION constexpr size_t qHash	(	char16_t	key,
		size_t	seed = `0`
	)

◆ qHash() [3/30]

Q_DECL_CONST_FUNCTION constexpr size_t qHash	(	char32_t	key,
		size_t	seed = `0`
	)

◆ qHash() [4/30]

Q_CORE_EXPORT Q_DECL_PURE_FUNCTION size_t qHash	(	const QBitArray &	key,
		size_t	seed = `0`
	)

◆ qHash() [5/30]

Q_DECL_PURE_FUNCTION size_t qHash	(	const QByteArray &	key,
		size_t	seed = `0 QT6_DECL_NEW_OVERLOAD_TAIL`
	)

◆ qHash() [6/30]

Q_DECL_CONST_FUNCTION constexpr size_t qHash	(	const QChar	key,
		size_t	seed = `0`
	)

◆ qHash() [7/30]

Q_DECL_PURE_FUNCTION size_t qHash	(	const QString &	key,
		size_t	seed = `0`
	)

◆ qHash() [8/30]

template<typename T1 , typename T2 >

size_t qHash	(	const std::pair< T1, T2 > &	key,
		size_t	seed = `0`
	)

Referenced by QHash< Key, T >::qHash(), QHash< Key, T >::qHash(), QHash< Key, T >::qHash(), QHash< Key, T >::qHash(), qHash(), QHash< Key, T >::qHash(), and qHash().

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◆ qHash() [9/30]

template<class T >

size_t qHash	(	const T *	key,
		size_t	seed = `0`
	)

◆ qHash() [10/30]

Q_CORE_EXPORT Q_DECL_CONST_FUNCTION size_t qHash	(	double	key,
		size_t	seed = `0`
	)

template<class Enum , std::enable_if_t< std::is_enum_v< Enum >, bool > = true>

Q_DECL_CONST_FUNCTION constexpr size_t qHash	(	Enum	e,
		size_t	seed = `0`
	)

inlineconstexprnoexcept

Definition at line 137 of file qhashfunctions.h.

References e, QHashPrivate::hash(), qToUnderlying(), and seed.

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◆ qHash() [12/30]

Q_DECL_CONST_FUNCTION size_t qHash	(	float	key,
		size_t	seed = `0`
	)

◆ qHash() [13/30]

Q_DECL_CONST_FUNCTION constexpr size_t qHash	(	int	key,
		size_t	seed = `0`
	)

◆ qHash() [14/30]

Q_CORE_EXPORT Q_DECL_CONST_FUNCTION size_t qHash	(	long double	key,
		size_t	seed = `0`
	)

Q_DECL_CONST_FUNCTION constexpr size_t qHash	(	long	key,
		size_t	seed = `0`
	)

◆ qHash() [16/30]

Q_CORE_EXPORT Q_DECL_PURE_FUNCTION size_t qHash	(	QByteArrayView	key,
		size_t	seed = `0`
	)

noexcept

Definition at line 956 of file qhash.cpp.

References qHashBits(), and seed.

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◆ qHash() [17/30]

template<typename Enum >

Q_DECL_CONST_FUNCTION constexpr size_t qHash	(	QFlags< Enum >	flags,
		size_t	seed = `0`
	)

inlineconstexprnoexcept

Definition at line 163 of file qhashfunctions.h.

References qHash(), and seed.

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◆ qHash() [18/30]

Q_DECL_CONST_FUNCTION constexpr size_t qHash	(	qint64	key,
		size_t	seed = `0`
	)

◆ qHash() [19/30]

Q_DECL_CONST_FUNCTION constexpr size_t qHash	(	QKeyCombination	key,
		size_t	seed = `0`
	)

inlineconstexprnoexcept

Definition at line 158 of file qhashfunctions.h.

References qHash(), and seed.

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◆ qHash() [20/30]

Q_CORE_EXPORT Q_DECL_PURE_FUNCTION size_t qHash	(	QLatin1StringView	key,
		size_t	seed = `0`
	)

◆ qHash() [21/30]

Q_CORE_EXPORT Q_DECL_PURE_FUNCTION size_t qHash	(	QStringView	key,
		size_t	seed = `0`
	)

◆ qHash() [22/30]

Q_DECL_CONST_FUNCTION constexpr size_t qHash	(	quint64	key,
		size_t	seed = `0`
	)

◆ qHash() [23/30]

Q_DECL_CONST_FUNCTION constexpr size_t qHash	(	short	key,
		size_t	seed = `0`
	)

◆ qHash() [24/30]

Q_DECL_CONST_FUNCTION constexpr size_t qHash	(	signed char	key,
		size_t	seed = `0`
	)

◆ qHash() [25/30]

Q_DECL_CONST_FUNCTION constexpr size_t qHash	(	std::nullptr_t	,
		size_t	seed = `0`
	)

◆ qHash() [26/30]

Q_DECL_CONST_FUNCTION constexpr size_t qHash	(	uchar	key,
		size_t	seed = `0`
	)

◆ qHash() [27/30]

Q_DECL_CONST_FUNCTION constexpr size_t qHash	(	uint	key,
		size_t	seed = `0`
	)

◆ qHash() [28/30]

Q_DECL_CONST_FUNCTION constexpr size_t qHash	(	ulong	key,
		size_t	seed = `0`
	)

◆ qHash() [29/30]

Q_DECL_CONST_FUNCTION constexpr size_t qHash	(	ushort	key,
		size_t	seed = `0`
	)

◆ qHash() [30/30]

Q_DECL_CONST_FUNCTION constexpr size_t qHash	(	wchar_t	key,
		size_t	seed = `0`
	)

◆ qHashBits()

Q_CORE_EXPORT Q_DECL_PURE_FUNCTION size_t qHashBits	(	const void *	p,
		size_t	size,
		size_t	seed = `0`
	)

Referenced by QTlsPrivate::X509CertificateOpenSSL::hash(), qHash(), qHash(), qHash(), qHash(), qHash(), QHash< Key, T >::qHash(), and QStringView::qHash().

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◆ qHashEquals()

template<typename T >

bool qHashEquals	(	const T &	a,
		const T &	b
	)

Referenced by QHashPrivate::Data< Node >::findBucket().

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◆ qHashMulti()

template<typename... T>

constexpr QtPrivate::QHashMultiReturnType< T... > qHashMulti	(	size_t	seed,
		const T &...	args
	)

Referenced by QGeoCirclePrivate::hash(), QGeoPathPrivate::hash(), QGeoPolygonPrivate::hash(), QGeoRectanglePrivate::hash(), qHash(), QByteArray::FromBase64Result::qHash(), qHash(), qHash(), qHash(), QGeoAddress::qHash(), QGeoLocation::qHash(), qHash(), qHash(), qHash(), qHash(), QShaderKey::qHash(), qHash(), qHash(), QHash< Key, T >::qHash(), and QHash< Key, T >::qHash().

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◆ qHashMultiCommutative()

template<typename... T>

constexpr QtPrivate::QHashMultiReturnType< T... > qHashMultiCommutative	(	size_t	seed,
		const T &...	args
	)

◆ qHashRange()

template<typename InputIterator >

size_t qHashRange	(	InputIterator	first,
		InputIterator	last,
		size_t	seed = `0`
	)

Referenced by QVLABase< T >::hash(), QGeoPathPrivate::hash(), QGeoPolygonPrivate::hash(), qHash(), qHash(), qHash(), and qHash().

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◆ qHashRangeCommutative()

template<typename InputIterator >

size_t qHashRangeCommutative	(	InputIterator	first,
		InputIterator	last,
		size_t	seed = `0`
	)

Referenced by qHash().

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◆ qt_hash()

Q_CORE_EXPORT Q_DECL_PURE_FUNCTION uint qt_hash	(	QStringView	key,
		uint	chained
	)

noexcept

Private copy of the implementation of the Qt 4 qHash algorithm for strings, (that is, QChar-based arrays, so all QString-like classes), to be used wherever the result is somehow stored or reused across multiple Qt versions. The public qHash implementation can change at any time, therefore one must not rely on the fact that it will always give the same results.

The qt_hash functions must never change their results.

This function can hash discontiguous memory by invoking it on each chunk, passing the previous's result in the next call's chained argument.

Definition at line 1146 of file qhash.cpp.

Referenced by QResourceRoot::findNode(), qt_rcc_compare_hash::operator()(), and RCCFileInfo::writeDataName().

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Classes

Namespaces

Macros

Typedefs

Functions

Variables

Macro Definition Documentation

◆ QT_SPECIALIZE_STD_HASH_TO_CALL_QHASH

◆ QT_SPECIALIZE_STD_HASH_TO_CALL_QHASH_BY_CREF

◆ QT_SPECIALIZE_STD_HASH_TO_CALL_QHASH_BY_VALUE

Function Documentation

◆ qHash() [1/30]

◆ qHash() [2/30]

◆ qHash() [3/30]

◆ qHash() [4/30]

◆ qHash() [5/30]

◆ qHash() [6/30]

◆ qHash() [7/30]

◆ qHash() [8/30]

◆ qHash() [9/30]

◆ qHash() [10/30]

◆ qHash() [11/30]

◆ qHash() [12/30]

◆ qHash() [13/30]

◆ qHash() [14/30]

◆ qHash() [15/30]

◆ qHash() [16/30]

◆ qHash() [17/30]

◆ qHash() [18/30]

◆ qHash() [19/30]

◆ qHash() [20/30]

◆ qHash() [21/30]

◆ qHash() [22/30]

◆ qHash() [23/30]

◆ qHash() [24/30]

◆ qHash() [25/30]

◆ qHash() [26/30]

◆ qHash() [27/30]

◆ qHash() [28/30]

◆ qHash() [29/30]

◆ qHash() [30/30]

◆ qHashBits()

◆ qHashEquals()

◆ qHashMulti()

◆ qHashMultiCommutative()

◆ qHashRange()

◆ qHashRangeCommutative()

◆ qt_hash()