Struct qt_core::q_set_of_q_abstract_state::ConstIterator

#[repr(C)]
pub struct ConstIterator { /* private fields */ }

The QSet::const_iterator class provides an STL-style const iterator for QSet.

C++ class: QSet<QAbstractState*>::const_iterator.

C++ documentation:

The QSet::const_iterator class provides an STL-style const iterator for QSet.

QSet features both STL-style iterators and Java-style iterators. The STL-style iterators are more low-level and more cumbersome to use; on the other hand, they are slightly faster and, for developers who already know STL, have the advantage of familiarity.

QSet<Key, T>::const_iterator allows you to iterate over a QSet. If you want to modify the QSet as you iterate over it, you must use QSet::iterator instead. It is generally good practice to use QSet::const_iterator on a non-const QSet as well, unless you need to change the QSet through the iterator. Const iterators are slightly faster, and can improve code readability.

The default QSet::const_iterator constructor creates an uninitialized iterator. You must initialize it using a function like QSet::begin(), QSet::end(), or QSet::insert() before you can start iterating. Here's a typical loop that prints all the items stored in a set:

QSet<QString> set;
set << “January” << “February” << ... << “December”;
QSet<QString>::const_iterator i;
for (i = set.begin(); i != set.end(); ++i)
      qDebug() << *i;

STL-style iterators can be used as arguments to generic algorithms. For example, here's how to find an item in the set using the qFind() algorithm:

QSet<QString> set;
...
QSet<QString>::iterator it = qFind(set.begin(), set.end(), “Jeanette”);
if (it != set.constEnd())
      cout << “Found Jeanette” << endl;

Warning: Iterators on implicitly shared containers do not work exactly like STL-iterators. You should avoid copying a container while iterators are active on that container. For more information, read Implicit sharing iterator problem.

Implementations

impl ConstIterator

pub unsafe fn add_assign(&self, j: c_int) -> Ref<ConstIterator>

Advances the iterator by j items.

Calls C++ function: QSet<QAbstractState*>::const_iterator& QSet<QAbstractState*>::const_iterator::operator+=(int j).

C++ documentation:

Advances the iterator by j items.

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

pub unsafe fn copy_from( &self, o: impl CastInto<Ref<ConstIterator>> ) -> Ref<ConstIterator>

Assigns other to this.

Calls C++ function: QSet<QAbstractState*>::const_iterator& QSet<QAbstractState*>::const_iterator::operator=(const QSet<QAbstractState*>::const_iterator& o).

C++ documentation:

Assigns other to this.

pub unsafe fn dec(&self) -> Ref<ConstIterator>

The prefix -- operator (--it) makes the preceding item current and returns an iterator to the new current item.

Calls C++ function: QSet<QAbstractState*>::const_iterator& QSet<QAbstractState*>::const_iterator::operator--().

C++ documentation:

The prefix – operator (–it) makes the preceding item current and returns an iterator to the new current item.

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

See also operator++().

pub unsafe fn dec_postfix(&self, arg1: c_int) -> CppBox<ConstIterator>

This is an overloaded function.

Calls C++ function: QSet<QAbstractState*>::const_iterator QSet<QAbstractState*>::const_iterator::operator--(int arg1).

C++ documentation:

This is an overloaded function.

The postfix -- operator (it--) makes the preceding item current and returns an iterator to the previously current item.

pub unsafe fn inc(&self) -> Ref<ConstIterator>

The prefix ++ operator (++it) advances the iterator to the next item in the container and returns an iterator to the new current item.

Calls C++ function: QSet<QAbstractState*>::const_iterator& QSet<QAbstractState*>::const_iterator::operator++().

C++ documentation:

The prefix ++ operator (++it) advances the iterator to the next item in the container and returns an iterator to the new current item.

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

See also operator--().

pub unsafe fn inc_postfix(&self, arg1: c_int) -> CppBox<ConstIterator>

This is an overloaded function.

Calls C++ function: QSet<QAbstractState*>::const_iterator QSet<QAbstractState*>::const_iterator::operator++(int arg1).

C++ documentation:

This is an overloaded function.

The postfix ++ operator (it++) advances the iterator to the next item in the container and returns an iterator to the previously current item.

pub unsafe fn indirection(&self) -> *const *mut QAbstractState

Returns the current value, converted to a QVariant.

Calls C++ function: const QAbstractState*& QSet<QAbstractState*>::const_iterator::operator*() const.

C++ documentation:

Returns the current value, converted to a QVariant.

pub unsafe fn new_0a() -> CppBox<ConstIterator>

Constructs an uninitialized iterator.

Calls C++ function: [constructor] void QSet<QAbstractState*>::const_iterator::const_iterator().

C++ documentation:

Constructs an uninitialized iterator.

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

See also QSet::begin() and QSet::end().

pub unsafe fn new_1a(o: impl CastInto<Ref<Iterator>>) -> CppBox<ConstIterator>

This is an overloaded function.

Calls C++ function: [constructor] void QSet<QAbstractState*>::const_iterator::const_iterator(const QSet<QAbstractState*>::iterator& o).

Warning: no exact match found in C++ documentation. Below is the C++ documentation for const_iterator::const_iterator(const iterator &other):

This is an overloaded function.

Constructs a copy of other.

This function was introduced in Qt 4.2.

pub unsafe fn new_copy( o: impl CastInto<Ref<ConstIterator>> ) -> CppBox<ConstIterator>

This is an overloaded function.

Calls C++ function: [constructor] void QSet<QAbstractState*>::const_iterator::const_iterator(const QSet<QAbstractState*>::const_iterator& o).

Warning: no exact match found in C++ documentation. Below is the C++ documentation for const_iterator::const_iterator(const iterator &other):

This is an overloaded function.

Constructs a copy of other.

This function was introduced in Qt 4.2.

pub unsafe fn struct_deref(&self) -> *const *mut QAbstractState

Returns a pointer to the current result.

Calls C++ function: const QAbstractState** QSet<QAbstractState*>::const_iterator::operator->() const.

C++ documentation:

Returns a pointer to the current result.

pub unsafe fn sub_assign(&self, j: c_int) -> Ref<ConstIterator>

Makes the iterator go back by j items.

Calls C++ function: QSet<QAbstractState*>::const_iterator& QSet<QAbstractState*>::const_iterator::operator-=(int j).

C++ documentation:

Makes the iterator go back by j items.

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

Trait Implementations

impl Add<i32> for &ConstIterator

fn add(self, j: c_int) -> CppBox<ConstIterator>

Returns an iterator to the item at j positions forward from this iterator.

Calls C++ function: QSet<QAbstractState*>::const_iterator QSet<QAbstractState*>::const_iterator::operator+(int j) const.

C++ documentation:

Returns an iterator to the item at j positions forward from this iterator.

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

type Output = CppBox<ConstIterator>

The resulting type after applying the + operator.

impl CppDeletable for ConstIterator

unsafe fn delete(&self)

The QSet::const_iterator class provides an STL-style const iterator for QSet.

Calls C++ function: [destructor] void QSet<QAbstractState*>::const_iterator::~const_iterator().

C++ documentation:

The QSet::const_iterator class provides an STL-style const iterator for QSet.

QSet features both STL-style iterators and Java-style iterators. The STL-style iterators are more low-level and more cumbersome to use; on the other hand, they are slightly faster and, for developers who already know STL, have the advantage of familiarity.

QSet<Key, T>::const_iterator allows you to iterate over a QSet. If you want to modify the QSet as you iterate over it, you must use QSet::iterator instead. It is generally good practice to use QSet::const_iterator on a non-const QSet as well, unless you need to change the QSet through the iterator. Const iterators are slightly faster, and can improve code readability.

The default QSet::const_iterator constructor creates an uninitialized iterator. You must initialize it using a function like QSet::begin(), QSet::end(), or QSet::insert() before you can start iterating. Here's a typical loop that prints all the items stored in a set:

QSet<QString> set;
set << “January” << “February” << ... << “December”;
QSet<QString>::const_iterator i;
for (i = set.begin(); i != set.end(); ++i)
      qDebug() << *i;

STL-style iterators can be used as arguments to generic algorithms. For example, here's how to find an item in the set using the qFind() algorithm:

QSet<QString> set;
...
QSet<QString>::iterator it = qFind(set.begin(), set.end(), “Jeanette”);
if (it != set.constEnd())
      cout << “Found Jeanette” << endl;

Warning: Iterators on implicitly shared containers do not work exactly like STL-iterators. You should avoid copying a container while iterators are active on that container. For more information, read Implicit sharing iterator problem.

impl Decrement for ConstIterator

unsafe fn dec(&self) -> Ref<ConstIterator>

The prefix -- operator (--it) makes the preceding item current and returns an iterator to the new current item.

Calls C++ function: QSet<QAbstractState*>::const_iterator& QSet<QAbstractState*>::const_iterator::operator--().

C++ documentation:

The prefix – operator (–it) makes the preceding item current and returns an iterator to the new current item.

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

See also operator++().

type Output = Ref<ConstIterator>

Output type.

impl Increment for ConstIterator

unsafe fn inc(&self) -> Ref<ConstIterator>

The prefix ++ operator (++it) advances the iterator to the next item in the container and returns an iterator to the new current item.

Calls C++ function: QSet<QAbstractState*>::const_iterator& QSet<QAbstractState*>::const_iterator::operator++().

C++ documentation:

The prefix ++ operator (++it) advances the iterator to the next item in the container and returns an iterator to the new current item.

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

See also operator--().

type Output = Ref<ConstIterator>

Output type.

impl Indirection for ConstIterator

unsafe fn indirection(&self) -> *const *mut QAbstractState

Returns the current value, converted to a QVariant.

Calls C++ function: const QAbstractState*& QSet<QAbstractState*>::const_iterator::operator*() const.

C++ documentation:

Returns the current value, converted to a QVariant.

type Output = *const *mut QAbstractState

Output type.

impl PartialEq<Ref<ConstIterator>> for ConstIterator

fn eq(&self, o: &Ref<ConstIterator>) -> bool

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

Calls C++ function: bool QSet<QAbstractState*>::const_iterator::operator==(const QSet<QAbstractState*>::const_iterator& o) const.

C++ documentation:

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

See also operator!=().

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Sub<i32> for &ConstIterator

fn sub(self, j: c_int) -> CppBox<ConstIterator>

Returns an iterator to the item at j positions backward from this iterator.

Calls C++ function: QSet<QAbstractState*>::const_iterator QSet<QAbstractState*>::const_iterator::operator-(int j) const.

C++ documentation:

Returns an iterator to the item at j positions backward from this iterator.

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

type Output = CppBox<ConstIterator>

The resulting type after applying the - operator.