QFlags Class

label->setAlignment(Qt::AlignLeft | Qt::AlignTop);
label->setAlignment({ });

class MyClass
{
public:
    enum Option {
        NoOptions = 0x0,
        ShowTabs = 0x1,
        ShowAll = 0x2,
        SqueezeBlank = 0x4
    };
    Q_DECLARE_FLAGS(Options, Option)
    ...
};

Q_DECLARE_OPERATORS_FOR_FLAGS(MyClass::Options)

Q_FLAG(Options)

Member Function Documentation

[default] QFlags::QFlags(const QFlags<T> &other)

Constructs a copy of other.

[since 5.4] QFlags::QFlags(std::initializer_list<Enum> flags)

Constructs a QFlags object initialized with all flags combined using the bitwise OR operator.

This function was introduced in Qt 5.4.

See also operator|=() and operator|().

QFlags::QFlags(QFlag flag)

Constructs a QFlags object initialized with the integer flag.

The QFlag type is a helper type. By using it here instead of int, we effectively ensure that arbitrary enum values cannot be cast to a QFlags, whereas untyped enum values (i.e., int values) can.

QFlags::QFlags(Enum flags)

Constructs a QFlags object storing the flags.

[since 5.15] QFlags::QFlags()

Constructs a QFlags object with no flags set.

This function was introduced in Qt 5.15.

[default] int &QFlags::operator=(const QFlags<T> &)

Assigns other to this object and returns a reference to this object.

[static, since 6.2] QFlags<T> QFlags::fromInt(QFlags::Int i)

Constructs a QFlags object representing the integer value i.

This function was introduced in Qt 6.2.

[since 5.7] QFlags<T> &QFlags::setFlag(Enum flag, bool on = true)

Sets the flag flag if on is true or unsets it if on is false. Returns a reference to this object.

This function was introduced in Qt 5.7.

[since 6.2] bool QFlags::testAnyFlag(Enum flag) const

Returns true if any flag set in flag is also set in this flags object, otherwise false. If flag has no flags set, the return will always be false.

This function was introduced in Qt 6.2.

See also testFlag().

[since 6.2] bool QFlags::testAnyFlags(QFlags<T> flags) const

Returns true if any flag set in flags is also set in this flags object, otherwise false. If flags has no flags set, the return will always be false.

This function was introduced in Qt 6.2.

See also testFlags().

bool QFlags::testFlag(Enum flag) const

Returns true if the flag flag is set, otherwise false.

See also testAnyFlag().

[since 6.2] bool QFlags::testFlags(QFlags<T> flags) const

Returns true if this flags object matches the given flags.

If flags has any flags set, this flags object matches precisely if all flags set in flags are also set in this flags object. Otherwise, when flags has no flags set, this flags object only matches if it also has no flags set.

This function was introduced in Qt 6.2.

See also testAnyFlags().

[since 6.2] QFlags::Int QFlags::toInt() const

Returns the value stored in the QFlags object as an integer. Note that the returned integer may be signed or unsigned, depending on whether the enum's underlying type is signed or unsigned.

This function was introduced in Qt 6.2.

See also Int.

QFlags::Int QFlags::operator QFlags::Int() const

Returns the value stored in the QFlags object as an integer.

See also Int.

bool QFlags::operator!() const

Returns true if no flag is set (i.e., if the value stored by the QFlags object is 0); otherwise returns false.

QFlags<T> QFlags::operator&(int mask) const

Returns a QFlags object containing the result of the bitwise AND operation on this object and mask.

See also operator&=(), operator|(), operator^(), and operator~().

QFlags<T> QFlags::operator&(uint mask) const

This is an overloaded function.

[since 6.2] QFlags<T> QFlags::operator&(QFlags<T> other) const

This is an overloaded function.

This function was introduced in Qt 6.2.

QFlags<T> QFlags::operator&(Enum other) const

This is an overloaded function.

QFlags<T> &QFlags::operator&=(int mask)

Performs a bitwise AND operation with mask and stores the result in this QFlags object. Returns a reference to this object.

See also operator&(), operator|=(), and operator^=().

QFlags<T> &QFlags::operator&=(uint mask)

This is an overloaded function.

[since 6.2] QFlags<T> &QFlags::operator&=(QFlags<T> mask)

This is an overloaded function.

This function was introduced in Qt 6.2.

QFlags<T> &QFlags::operator&=(Enum mask)

This is an overloaded function.

QFlags<T> QFlags::operator^(QFlags<T> other) const

Returns a QFlags object containing the result of the bitwise XOR operation on this object and other.

See also operator^=(), operator&(), operator|(), and operator~().

QFlags<T> QFlags::operator^(Enum other) const

This is an overloaded function.

QFlags<T> &QFlags::operator^=(QFlags<T> other)

Performs a bitwise XOR operation with other and stores the result in this QFlags object. Returns a reference to this object.

See also operator^(), operator&=(), and operator|=().

QFlags<T> &QFlags::operator^=(Enum other)

This is an overloaded function.

QFlags<T> QFlags::operator|(QFlags<T> other) const

Returns a QFlags object containing the result of the bitwise OR operation on this object and other.

See also operator|=(), operator^(), operator&(), and operator~().

QFlags<T> QFlags::operator|(Enum other) const

This is an overloaded function.

QFlags<T> &QFlags::operator|=(QFlags<T> other)

Performs a bitwise OR operation with other and stores the result in this QFlags object. Returns a reference to this object.

See also operator|(), operator&=(), and operator^=().

QFlags<T> &QFlags::operator|=(Enum other)

This is an overloaded function.

QFlags<T> QFlags::operator~() const

Returns a QFlags object that contains the bitwise negation of this object.

See also operator&(), operator|(), and operator^().

typedef QFlags<Enum> Flags;