qvariant.h File Reference

#include <QtCore/qatomic.h>
#include <QtCore/qbytearray.h>
#include <QtCore/qlist.h>
#include <QtCore/qmetatype.h>
#include <QtCore/qmap.h>
#include <QtCore/qhash.h>
#include <QtCore/qstring.h>

Go to the source code of this file.

Classes
class	QVariant
struct	QVariant::PrivateShared
struct	QVariant::Private
union	QVariant::Private::Data
struct	QVariant::Handler
class	QVariantComparisonHelper
Typedefs
typedef QList< QVariant >	QVariantList
typedef QMap< QString, QVariant >	QVariantMap
typedef QHash< QString, QVariant >	QVariantHash
Functions
template<typename T >
QVariant	qVariantFromValue (const T &)
template<typename T >
void	qVariantSetValue (QVariant &, const T &)
template<typename T >
T	qVariantValue (const QVariant &)
template<typename T >
bool	qVariantCanConvert (const QVariant &)
bool	qvariant_cast_helper (const QVariant &v, QVariant::Type tp, void *ptr)
template<>
QVariant	qVariantFromValue (const QVariant &t)
template<>
void	qVariantSetValue< QVariant > (QVariant &v, const QVariant &t)
Q_CORE_EXPORT QDataStream &	operator>> (QDataStream &s, QVariant &p)
Q_CORE_EXPORT QDataStream &	operator<< (QDataStream &s, const QVariant &p)
Q_CORE_EXPORT QDataStream &	operator>> (QDataStream &s, QVariant::Type &p)
Q_CORE_EXPORT QDataStream &	operator<< (QDataStream &s, const QVariant::Type p)
bool	operator== (const QVariant &v1, const QVariantComparisonHelper &v2)
bool	operator!= (const QVariant &v1, const QVariantComparisonHelper &v2)
template<typename T >
T	qvariant_cast (const QVariant &v)
template<>
QVariant	qvariant_cast< QVariant > (const QVariant &v)
	Q_DECLARE_TYPEINFO (QVariant, Q_MOVABLE_TYPE)
Q_CORE_EXPORT QDebug	operator<< (QDebug, const QVariant &)
Q_CORE_EXPORT QDebug	operator<< (QDebug, const QVariant::Type)

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Typedef Documentation

typedef QList<QVariant> QVariantList

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Definition at line 447 of file qvariant.h.

typedef QMap<QString, QVariant> QVariantMap

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Definition at line 448 of file qvariant.h.

typedef QHash<QString, QVariant> QVariantHash

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Definition at line 449 of file qvariant.h.

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Function Documentation

QVariant qVariantFromValue

(

const T &

t

)

[inline]

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Definition at line 455 of file qvariant.h.

{
    return QVariant(qMetaTypeId<T>(reinterpret_cast<T *>(0)), &t, QTypeInfo<T>::isPointer);
}

void qVariantSetValue	(	QVariant &	v,
		const T &	t
	)		[inline]

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Definition at line 464 of file qvariant.h.

{
    //if possible we reuse the current QVariant private
    const uint type = qMetaTypeId<T>(reinterpret_cast<T *>(0));
    QVariant::Private &d = v.data_ptr();
    if (v.isDetached() && (type == d.type || (type <= uint(QVariant::Char) && d.type <= uint(QVariant::Char)))) {
        d.type = type;
        d.is_null = false;
        T *old = reinterpret_cast<T*>(d.is_shared ? d.data.shared->ptr : &d.data.ptr);
        if (QTypeInfo<T>::isComplex)
            old->~T();
        new (old) T(t); //call the copy constructor
    } else {
        v = QVariant(type, &t, QTypeInfo<T>::isPointer);
    }
}

T qVariantValue

(

const QVariant &

variant

)

[inline]

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Definition at line 598 of file qvariant.h.

{ return qvariant_cast<T>(variant); }

bool qVariantCanConvert

(

const QVariant &

variant

)

[inline]

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Definition at line 602 of file qvariant.h.

{
    return variant.canConvert(static_cast<QVariant::Type>(
                qMetaTypeId<T>(static_cast<T *>(0))));
}

bool qvariant_cast_helper	(	const QVariant &	v,
		QVariant::Type	tp,
		void *	ptr
	)		[inline]

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Definition at line 451 of file qvariant.h.

{ return QVariant::handler->convert(&v.d, tp, ptr, 0); }

QVariant qVariantFromValue

(

const QVariant &

t

)

[inline]

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Definition at line 461 of file qvariant.h.

{ return t; }

void qVariantSetValue< QVariant >	(	QVariant &	v,
		const QVariant &	t
	)		[inline]

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Definition at line 482 of file qvariant.h.

{
    v = t;
}

Q_CORE_EXPORT QDataStream& operator>>	(	QDataStream &	s,
		QVariant &	p
	)

Q_CORE_EXPORT QDataStream& operator<<	(	QDataStream &	s,
		const QVariant &	p
	)

Q_CORE_EXPORT QDataStream& operator>>	(	QDataStream &	s,
		QVariant::Type &	p
	)

Q_CORE_EXPORT QDataStream& operator<<	(	QDataStream &	s,
		const QVariant::Type	p
	)

bool operator==	(	const QVariant &	v1,
		const QVariantComparisonHelper &	v2
	)		[inline]

Definition at line 565 of file qvariant.h.

{
    return v1.cmp(*v2.v);
}

bool operator!=	(	const QVariant &	v1,
		const QVariantComparisonHelper &	v2
	)		[inline]

Definition at line 570 of file qvariant.h.

{
    return !operator==(v1, v2);
}

T qvariant_cast

(

const QVariant &

v

)

[inline]

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Definition at line 577 of file qvariant.h.

{
    const int vid = qMetaTypeId<T>(static_cast<T *>(0));
    if (vid == v.userType())
        return *reinterpret_cast<const T *>(v.constData());
    if (vid < int(QMetaType::User)) {
        T t;
        if (qvariant_cast_helper(v, QVariant::Type(vid), &t))
            return t;
    }
    return T();
}

QVariant qvariant_cast< QVariant >

(

const QVariant &

v

)

[inline]

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Definition at line 590 of file qvariant.h.

{
    if (v.userType() == QMetaType::QVariant)
        return *reinterpret_cast<const QVariant *>(v.constData());
    return v;
}

Q_DECLARE_TYPEINFO	(	QVariant	,
		Q_MOVABLE_TYPE
	)

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Q_CORE_EXPORT QDebug operator<<	(	QDebug	,
		const QVariant &
	)

Q_CORE_EXPORT QDebug operator<<	(	QDebug	,
		const QVariant::Type
	)