const_iterator Class Reference(QFuture::const_iterator)The QFuture::const_iterator class provides an STL-style const iterator for QFuture. Далее... #include <QFuture> Замечание: Все функции в этом классе реентерабельны. Этот класс был введён в Qt 4.4. Открытые типы
Открытые функции
Подробное описаниеThe 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. Описание типов-членовtypedef const_iterator::difference_typeПсевдоним типа для ptrdiff_t. Предоставлен для совместимости с STL. typedef const_iterator::iterator_categoryTypedef for std::bidirectional_iterator_tag. Предоставлен для совместимости с STL. typedef const_iterator::pointerПсевдоним типа для const T *. Предоставлен для совместимости с STL. typedef const_iterator::referenceTypedef for const T &. Предоставлен для совместимости с STL. typedef const_iterator::value_typeПсевдоним типа для T. Предоставлен для совместимости с STL. Описание функций-членовconst_iterator::const_iterator ()Constructs an uninitialized iterator. Functions like operator*() and operator++() should not be called on an uninitialized iterartor. Use operator=() to assign a value to it before using it. See also QFuture::constBegin() and QFuture::constEnd(). const_iterator::const_iterator ( const const_iterator & other )Создаёт копию other. bool const_iterator::operator!= ( const const_iterator & other ) constReturns true if other points to a different result than this iterator; otherwise returns false. Смотрите также operator==(). const T & const_iterator::operator* () constReturns the current result. const_iterator const_iterator::operator+ ( int j ) constReturns an iterator to the results at j positions forward from this iterator. (If j is negative, the iterator goes backward.) See also operator-() and operator+=(). const_iterator & const_iterator::operator++ ()The prefix ++ operator (++it) advances the iterator to the next result in the future and returns an iterator to the new current result. Calling this function on QFuture::constEnd() leads to undefined results. See also operator--(). const_iterator const_iterator::operator++ ( int )Это перегруженная функция. The postfix ++ operator (it++) advances the iterator to the next result in the future and returns an iterator to the previously current result. const_iterator & const_iterator::operator+= ( int j )Advances the iterator by j results. (If j is negative, the iterator goes backward.) See also operator-=() and operator+(). const_iterator const_iterator::operator- ( int j ) constReturns an iterator to the result at j positions backward from this iterator. (If j is negative, the iterator goes forward.) See also operator+() and operator-=(). const_iterator & const_iterator::operator-- ()The prefix -- operator (--it) makes the preceding result current and returns an iterator to the new current result. Calling this function on QFuture::constBegin() leads to undefined results. See also operator++(). const_iterator const_iterator::operator-- ( int )Это перегруженная функция. The postfix -- operator (it--) makes the preceding result current and returns an iterator to the previously current result. const_iterator & const_iterator::operator-= ( int j )Makes the iterator go back by j results. (If j is negative, the iterator goes forward.) See also operator+=() and operator-(). const T * const_iterator::operator-> () constReturns a pointer to the current result. const_iterator & const_iterator::operator= ( const const_iterator & other )Assigns other to this iterator. bool const_iterator::operator== ( const const_iterator & other ) constReturns true if other points to the same result as this iterator; otherwise returns false. Смотрите также operator!=(). |
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