ConstIterator Class

class QCborMap::ConstIterator

The QCborMap::ConstIterator class provides an STL-style const iterator for QCborMap. More...

This class was introduced in Qt 5.12.

• List of all members, including inherited members

Public Types

iterator_category

Public Functions

	ConstIterator(const ConstIterator &other)
	ConstIterator()
ConstIterator &	operator=(const ConstIterator &other)
QCborValue	key() const
QCborValueRef	value() const
bool	operator!=(const Iterator &other) const
bool	operator!=(const ConstIterator &other) const
ConstIterator::value_type	operator*() const
ConstIterator	operator+(qsizetype j) const
ConstIterator &	operator++()
ConstIterator	operator++(int)
ConstIterator &	operator+=(qsizetype j)
ConstIterator	operator-(qsizetype j) const
qsizetype	operator-(ConstIterator j) const
ConstIterator &	operator--()
ConstIterator	operator--(int)
ConstIterator &	operator-=(qsizetype j)
const QCborValueRef *	operator->() const
bool	operator<(const Iterator &other) const
bool	operator<(const ConstIterator &other) const
bool	operator<=(const Iterator &other) const
bool	operator<=(const ConstIterator &other) const
bool	operator==(const Iterator &other) const
bool	operator==(const ConstIterator &other) const
bool	operator>(const Iterator &other) const
bool	operator>(const ConstIterator &other) const
bool	operator>=(const Iterator &other) const
bool	operator>=(const ConstIterator &other) const

Detailed Description

QCborMap::ConstIterator allows you to iterate over a QCborMap. If you want to modify the QCborMap as you iterate over it, you must use QCborMap::Iterator instead. It is generally good practice to use QCborMap::ConstIterator, even on a non-const QCborMap, when you don't need to change the QCborMap through the iterator. Const iterators are slightly faster and improve code readability.

You must initialize the iterator using a QCborMap function like QCborMap::begin(), QCborMap::end(), or QCborMap::find() before you can start iterating..

Multiple iterators can be used on the same object. Existing iterators will however become dangling if the object gets modified.

See also QCborMap::Iterator.

Member Type Documentation

ConstIterator::iterator_category

A synonym for std::random_access_iterator_tag indicating this iterator is a random-access iterator.

Member Function Documentation

Returns true if the entry in the map pointed to by this iterator occurs after or is the same entry as is pointed to by the other iterator.

Returns true if the entry in the map pointed to by this iterator occurs after the entry pointed to by the other iterator.

Returns true if the entry in the map pointed to by this iterator occurs before or is the same entry as is pointed to by the other iterator.

Returns true if the entry in the map pointed to by this iterator occurs before the entry pointed to by the other iterator.

Returns true if other points to a different entry in the map than this iterator; otherwise returns false.

See also operator==().

Returns true if other points to the same entry in the map as this iterator; otherwise returns false.

See also operator!=().

ConstIterator::ConstIterator(const ConstIterator &other)

Constructs an iterator as a copy of other.

ConstIterator::ConstIterator()

Constructs an uninitialized iterator.

Functions like key(), value(), and operator++() must not be called on an uninitialized iterator. Use operator=() to assign a value to it before using it.

See also QCborMap::constBegin() and QCborMap::constEnd().

ConstIterator &ConstIterator::operator=(const ConstIterator &other)

Makes this iterator a copy of other and returns a reference to this iterator.

QCborValue ConstIterator::key() const

Returns the current item's key.

See also value().

QCborValueRef ConstIterator::value() const

Returns the current item's value.

See also key() and operator*().

ConstIterator::value_type ConstIterator::operator*() const

Returns a pair containing the curent item's key and value.

See also key() and value().

ConstIterator ConstIterator::operator+(qsizetype j) const

Returns an iterator to the item at j positions forward from this iterator. If j is negative, the iterator goes backward.

See also operator-().

ConstIterator &ConstIterator::operator++()

The prefix ++ operator, ++i, advances the iterator to the next item in the map and returns this iterator.

Calling this function on QCborMap::end() leads to undefined results.

See also operator--().

ConstIterator ConstIterator::operator++(int)

This is an overloaded function.

The postfix ++ operator, i++, advances the iterator to the next item in the map and returns an iterator to the previously current item.

ConstIterator &ConstIterator::operator+=(qsizetype j)

Advances the iterator by j items. If j is negative, the iterator goes backward. Returns a reference to this iterator.

See also operator-=() and operator+().

ConstIterator ConstIterator::operator-(qsizetype j) const

Returns an iterator to the item at j positions backward from this iterator. If j is negative, the iterator goes forward.

See also operator+().

qsizetype ConstIterator::operator-(ConstIterator j) const

Returns the position of the item at iterator j relative to the item at this iterator. If the item at j is forward of this time, the returned value is negative.

See also operator+().

ConstIterator &ConstIterator::operator--()

The prefix -- operator, --i, makes the preceding item current and returns this iterator.

Calling this function on QCborMap::begin() leads to undefined results.

See also operator++().

ConstIterator ConstIterator::operator--(int)

This is an overloaded function.

The postfix -- operator, i--, makes the preceding item current and returns an iterator pointing to the previously current item.

ConstIterator &ConstIterator::operator-=(qsizetype j)

Makes the iterator go back by j items. If j is negative, the iterator goes forward. Returns a reference to this iterator.

See also operator+=() and operator-().

const QCborValueRef *ConstIterator::operator->() const

Returns a pointer to the current pair's value.