const_iterator Class
(QFuture::const_iterator)The QFuture::const_iterator class provides an STL-style const iterator for QFuture. More...
Header: | #include <const_iterator> |
qmake: | QT += core |
Since: | Qt 4.4 |
Note: All functions in this class are reentrant.
Public Types
typedef | difference_type |
typedef | iterator_category |
typedef | pointer |
typedef | reference |
typedef | value_type |
Public Functions
const_iterator() | |
const_iterator(const QFuture<T> *const _future, int _index) | |
const_iterator(const const_iterator &o) | |
bool | operator!=(const const_iterator &other) const |
const T & | operator*() const |
const_iterator | operator+(int j) const |
const_iterator & | operator++() |
const_iterator | operator++(int) |
const_iterator & | operator+=(int j) |
const_iterator | operator-(int j) const |
const_iterator & | operator--() |
const_iterator | operator--(int) |
const_iterator & | operator-=(int j) |
const T * | operator->() const |
const_iterator & | operator=(const const_iterator &o) |
bool | operator==(const const_iterator &o) const |
Detailed Description
The QFuture::const_iterator class provides an STL-style const iterator for QFuture.
QFuture 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.
The default QFuture::const_iterator constructor creates an uninitialized iterator. You must initialize it using a QFuture function like QFuture::constBegin() or QFuture::constEnd() before you start iterating. Here's a typical loop that prints all the results available in a future:
QFuture<QString> future = ...; QFuture<QString>::const_iterator i; for (i = future.constBegin(); i != future.constEnd(); ++i) cout << *i << endl;
See also QFutureIterator and QFuture.
Member Type Documentation
typedef const_iterator::difference_type
Typedef for ptrdiff_t. Provided for STL compatibility.
typedef const_iterator::iterator_category
Typedef for std::bidirectional_iterator_tag. Provided for STL compatibility.
typedef const_iterator::pointer
Typedef for const T *. Provided for STL compatibility.
typedef const_iterator::reference
Typedef for const T &. Provided for STL compatibility.
typedef const_iterator::value_type
Typedef for T. Provided for STL compatibility.
Member Function Documentation
const_iterator::const_iterator()
Default constructs an instance of const_iterator.
const_iterator::const_iterator(const QFuture<T> *const _future, int _index)
Default constructs an instance of const_iterator.
const_iterator::const_iterator(const const_iterator &o)
Default constructs an instance of const_iterator.
bool const_iterator::operator!=(const const_iterator &other) const
const T &const_iterator::operator*() const
const_iterator const_iterator::operator+(int j) const
const_iterator &const_iterator::operator++()
const_iterator const_iterator::operator++(int)
const_iterator &const_iterator::operator+=(int j)
const_iterator const_iterator::operator-(int j) const
const_iterator &const_iterator::operator--()
const_iterator const_iterator::operator--(int)
const_iterator &const_iterator::operator-=(int j)
const T *const_iterator::operator->() const
const_iterator &const_iterator::operator=(const const_iterator &o)
Copy-assignment operator.