[−][src]Struct qt_gui::q_list_of_q_standard_item::ConstIterator
The QList::const_iterator class provides an STL-style const iterator for QList and QQueue.
C++ class: QList<QStandardItem*>::const_iterator
.
The QList::const_iterator class provides an STL-style const iterator for QList and QQueue.
QList provides 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.
QList<T>::const_iterator allows you to iterate over a QList<T> (or a QQueue<T>). If you want to modify the QList as you iterate over it, use QList::iterator instead. It is generally good practice to use QList::const_iterator on a non-const QList as well, unless you need to change the QList through the iterator. Const iterators are slightly faster, and can improve code readability.
The default QList::const_iterator constructor creates an uninitialized iterator. You must initialize it using a QList function like QList::constBegin(), QList::constEnd(), or QList::insert() before you can start iterating. Here's a typical loop that prints all the items stored in a list:
QList<QString> list; list.append("January"); list.append("February"); ... list.append("December");
QList<QString>::const_iterator i; for (i = list.constBegin(); i != list.constEnd(); ++i) cout << *i << endl;
Most QList functions accept an integer index rather than an iterator. For that reason, iterators are rarely useful in connection with QList. One place where STL-style iterators do make sense is as arguments to generic algorithms.
For example, here's how to delete all the widgets stored in a QList<QWidget *>:
QList<QWidget *> list; ... qDeleteAll(list.constBegin(), list.constEnd());
Multiple iterators can be used on the same list. However, be aware that any non-const function call performed on the QList will render all existing iterators undefined. If you need to keep iterators over a long period of time, we recommend that you use QLinkedList rather than QList.
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.
Methods
impl ConstIterator
[src]
pub unsafe fn copy_from(
&mut self,
other: impl CastInto<Ref<ConstIterator>>
) -> MutRef<ConstIterator>
[src]
&mut self,
other: impl CastInto<Ref<ConstIterator>>
) -> MutRef<ConstIterator>
The QList::const_iterator class provides an STL-style const iterator for QList and QQueue.
Calls C++ function: QList<QStandardItem*>::const_iterator& QList<QStandardItem*>::const_iterator::operator=(const QList<QStandardItem*>::const_iterator& other)
.
The QList::const_iterator class provides an STL-style const iterator for QList and QQueue.
QList provides 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.
QList<T>::const_iterator allows you to iterate over a QList<T> (or a QQueue<T>). If you want to modify the QList as you iterate over it, use QList::iterator instead. It is generally good practice to use QList::const_iterator on a non-const QList as well, unless you need to change the QList through the iterator. Const iterators are slightly faster, and can improve code readability.
The default QList::const_iterator constructor creates an uninitialized iterator. You must initialize it using a QList function like QList::constBegin(), QList::constEnd(), or QList::insert() before you can start iterating. Here's a typical loop that prints all the items stored in a list:
QList<QString> list; list.append("January"); list.append("February"); ... list.append("December");
QList<QString>::const_iterator i; for (i = list.constBegin(); i != list.constEnd(); ++i) cout << *i << endl;
Most QList functions accept an integer index rather than an iterator. For that reason, iterators are rarely useful in connection with QList. One place where STL-style iterators do make sense is as arguments to generic algorithms.
For example, here's how to delete all the widgets stored in a QList<QWidget *>:
QList<QWidget *> list; ... qDeleteAll(list.constBegin(), list.constEnd());
Multiple iterators can be used on the same list. However, be aware that any non-const function call performed on the QList will render all existing iterators undefined. If you need to keep iterators over a long period of time, we recommend that you use QLinkedList rather than QList.
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.
pub unsafe fn dec(&mut self) -> MutRef<ConstIterator>
[src]
The prefix -- operator (--it
) makes the preceding item current and returns an iterator to the new current item.
Calls C++ function: QList<QStandardItem*>::const_iterator& QList<QStandardItem*>::const_iterator::operator--()
.
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(&mut self, arg1: c_int) -> CppBox<ConstIterator>
[src]
This is an overloaded function.
Calls C++ function: QList<QStandardItem*>::const_iterator QList<QStandardItem*>::const_iterator::operator--(int arg1)
.
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(&mut self) -> MutRef<ConstIterator>
[src]
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: QList<QStandardItem*>::const_iterator& QList<QStandardItem*>::const_iterator::operator++()
.
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(&mut self, arg1: c_int) -> CppBox<ConstIterator>
[src]
This is an overloaded function.
Calls C++ function: QList<QStandardItem*>::const_iterator QList<QStandardItem*>::const_iterator::operator++(int arg1)
.
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 new_0a() -> CppBox<ConstIterator>
[src]
Constructs an uninitialized iterator.
Calls C++ function: [constructor] void QList<QStandardItem*>::const_iterator::const_iterator()
.
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 QList::constBegin() and QList::constEnd().
pub unsafe fn new_1a(o: impl CastInto<Ref<Iterator>>) -> CppBox<ConstIterator>
[src]
Calls C++ function: [constructor] void QList<QStandardItem*>::const_iterator::const_iterator(const QList<QStandardItem*>::iterator& o)
.
pub unsafe fn new_copy(
o: impl CastInto<Ref<ConstIterator>>
) -> CppBox<ConstIterator>
[src]
o: impl CastInto<Ref<ConstIterator>>
) -> CppBox<ConstIterator>
Calls C++ function: [constructor] void QList<QStandardItem*>::const_iterator::const_iterator(const QList<QStandardItem*>::const_iterator& o)
.
Trait Implementations
impl<'_> Add<i64> for &'_ ConstIterator
[src]
type Output = CppBox<ConstIterator>
The resulting type after applying the +
operator.
fn add(self, j: c_longlong) -> CppBox<ConstIterator>
[src]
Calls C++ function: QList<QStandardItem*>::const_iterator QList<QStandardItem*>::const_iterator::operator+(long long j) const
.
impl AddAssign<i64> for ConstIterator
[src]
fn add_assign(&mut self, j: c_longlong)
[src]
Advances the iterator by j items.
Calls C++ function: QList<QStandardItem*>::const_iterator& QList<QStandardItem*>::const_iterator::operator+=(long long j)
.
Warning: no exact match found in C++ documentation. Below is the C++ documentation for const_iterator &const_iterator::operator+=(int j)
:
Advances the iterator by j items.
See also operator-=() and operator+().
impl CppDeletable for ConstIterator
[src]
unsafe fn delete(&mut self)
[src]
The QList::const_iterator class provides an STL-style const iterator for QList and QQueue.
Calls C++ function: [destructor] void QList<QStandardItem*>::const_iterator::~const_iterator()
.
The QList::const_iterator class provides an STL-style const iterator for QList and QQueue.
QList provides 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.
QList<T>::const_iterator allows you to iterate over a QList<T> (or a QQueue<T>). If you want to modify the QList as you iterate over it, use QList::iterator instead. It is generally good practice to use QList::const_iterator on a non-const QList as well, unless you need to change the QList through the iterator. Const iterators are slightly faster, and can improve code readability.
The default QList::const_iterator constructor creates an uninitialized iterator. You must initialize it using a QList function like QList::constBegin(), QList::constEnd(), or QList::insert() before you can start iterating. Here's a typical loop that prints all the items stored in a list:
QList<QString> list; list.append("January"); list.append("February"); ... list.append("December");
QList<QString>::const_iterator i; for (i = list.constBegin(); i != list.constEnd(); ++i) cout << *i << endl;
Most QList functions accept an integer index rather than an iterator. For that reason, iterators are rarely useful in connection with QList. One place where STL-style iterators do make sense is as arguments to generic algorithms.
For example, here's how to delete all the widgets stored in a QList<QWidget *>:
QList<QWidget *> list; ... qDeleteAll(list.constBegin(), list.constEnd());
Multiple iterators can be used on the same list. However, be aware that any non-const function call performed on the QList will render all existing iterators undefined. If you need to keep iterators over a long period of time, we recommend that you use QLinkedList rather than QList.
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
[src]
type Output = MutRef<ConstIterator>
Output type.
unsafe fn dec(&mut self) -> MutRef<ConstIterator>
[src]
The prefix -- operator (--it
) makes the preceding item current and returns an iterator to the new current item.
Calls C++ function: QList<QStandardItem*>::const_iterator& QList<QStandardItem*>::const_iterator::operator--()
.
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++().
impl Ge<Ref<ConstIterator>> for ConstIterator
[src]
unsafe fn ge(&self, other: &Ref<ConstIterator>) -> bool
[src]
Returns true
if the item pointed to by this iterator is greater than or equal to the item pointed to by the other iterator.
Calls C++ function: bool QList<QStandardItem*>::const_iterator::operator>=(const QList<QStandardItem*>::const_iterator& other) const
.
Returns true
if the item pointed to by this iterator is greater than or equal to the item pointed to by the other iterator.
impl Gt<Ref<ConstIterator>> for ConstIterator
[src]
unsafe fn gt(&self, other: &Ref<ConstIterator>) -> bool
[src]
Returns true
if the item pointed to by this iterator is greater than the item pointed to by the other iterator.
Calls C++ function: bool QList<QStandardItem*>::const_iterator::operator>(const QList<QStandardItem*>::const_iterator& other) const
.
Returns true
if the item pointed to by this iterator is greater than the item pointed to by the other iterator.
impl Increment for ConstIterator
[src]
type Output = MutRef<ConstIterator>
Output type.
unsafe fn inc(&mut self) -> MutRef<ConstIterator>
[src]
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: QList<QStandardItem*>::const_iterator& QList<QStandardItem*>::const_iterator::operator++()
.
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--().
impl Le<Ref<ConstIterator>> for ConstIterator
[src]
unsafe fn le(&self, other: &Ref<ConstIterator>) -> bool
[src]
Returns true
if the item pointed to by this iterator is less than or equal to the item pointed to by the other iterator.
Calls C++ function: bool QList<QStandardItem*>::const_iterator::operator<=(const QList<QStandardItem*>::const_iterator& other) const
.
Returns true
if the item pointed to by this iterator is less than or equal to the item pointed to by the other iterator.
impl Lt<Ref<ConstIterator>> for ConstIterator
[src]
unsafe fn lt(&self, other: &Ref<ConstIterator>) -> bool
[src]
Returns true
if the item pointed to by this iterator is less than the item pointed to by the other iterator.
Calls C++ function: bool QList<QStandardItem*>::const_iterator::operator<(const QList<QStandardItem*>::const_iterator& other) const
.
Returns true
if the item pointed to by this iterator is less than the item pointed to by the other iterator.
impl PartialEq<Ref<ConstIterator>> for ConstIterator
[src]
fn eq(&self, o: &Ref<ConstIterator>) -> bool
[src]
Returns true
if other points to the same item as this iterator; otherwise returns false
.
Calls C++ function: bool QList<QStandardItem*>::const_iterator::operator==(const QList<QStandardItem*>::const_iterator& o) const
.
Returns true
if other points to the same item as this iterator; otherwise returns false
.
See also operator!=().
#[must_use]
fn ne(&self, other: &Rhs) -> bool
1.0.0[src]
impl<'_> Sub<Ref<ConstIterator>> for &'_ ConstIterator
[src]
type Output = c_int
The resulting type after applying the -
operator.
fn sub(self, j: Ref<ConstIterator>) -> c_int
[src]
Calls C++ function: int QList<QStandardItem*>::const_iterator::operator-(QList<QStandardItem*>::const_iterator j) const
.
impl<'_> Sub<i64> for &'_ ConstIterator
[src]
type Output = CppBox<ConstIterator>
The resulting type after applying the -
operator.
fn sub(self, j: c_longlong) -> CppBox<ConstIterator>
[src]
Calls C++ function: QList<QStandardItem*>::const_iterator QList<QStandardItem*>::const_iterator::operator-(long long j) const
.
impl SubAssign<i64> for ConstIterator
[src]
fn sub_assign(&mut self, j: c_longlong)
[src]
Makes the iterator go back by j items.
Calls C++ function: QList<QStandardItem*>::const_iterator& QList<QStandardItem*>::const_iterator::operator-=(long long j)
.
Warning: no exact match found in C++ documentation. Below is the C++ documentation for const_iterator &const_iterator::operator-=(int j)
:
Makes the iterator go back by j items.
See also operator+=() and operator-().
Auto Trait Implementations
impl RefUnwindSafe for ConstIterator
impl Send for ConstIterator
impl Sync for ConstIterator
impl Unpin for ConstIterator
impl UnwindSafe for ConstIterator
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
[src]
T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
[src]
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
[src]
T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
[src]
impl<T, U> CastInto<U> for T where
U: CastFrom<T>,
[src]
U: CastFrom<T>,
impl<T> From<T> for T
[src]
impl<T, U> Into<U> for T where
U: From<T>,
[src]
U: From<T>,
impl<T> StaticUpcast<T> for T
[src]
unsafe fn static_upcast(ptr: Ptr<T>) -> Ptr<T>
[src]
unsafe fn static_upcast_mut(ptr: MutPtr<T>) -> MutPtr<T>
[src]
impl<T, U> TryFrom<U> for T where
U: Into<T>,
[src]
U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
[src]
impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
[src]
U: TryFrom<T>,