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.

bool const_iterator::operator==(const const_iterator &o) const