The QCborMap::ConstIterator 类提供 STL 样式 const 迭代器为 QCborMap . 更多...
| 头： | #include <ConstIterator> |
| qmake: | QT += core |
| Since: | Qt 5.12 |
| typedef | iterator_category |
| ConstIterator () | |
| ConstIterator (const ConstIterator & other ) | |
| QCborValue | key () const |
| QCborValueRef | value () const |
| bool | operator!= (const Iterator & other ) const |
| bool | operator!= (const ConstIterator & other ) const |
| ConstIterator::value_type | operator* () const |
| ConstIterator | operator+ (qsizetype j ) const |
| ConstIterator & | operator++ () |
| ConstIterator | operator++ ( int ) |
| ConstIterator & | operator+= (qsizetype j ) |
| ConstIterator | operator- (qsizetype j ) const |
| qsizetype | operator- (ConstIterator j ) const |
| ConstIterator & | operator-- () |
| ConstIterator | operator-- ( int ) |
| ConstIterator & | operator-= (qsizetype j ) |
| const QCborValueRef * | operator-> () const |
| bool | operator< (const Iterator & other ) const |
| bool | operator< (const ConstIterator & other ) const |
| bool | operator<= (const Iterator & other ) const |
| bool | operator<= (const ConstIterator & other ) const |
| ConstIterator & | operator= (const ConstIterator & other ) |
| bool | operator== (const Iterator & other ) const |
| bool | operator== (const ConstIterator & other ) const |
| bool | operator> (const Iterator & other ) const |
| bool | operator> (const ConstIterator & other ) const |
| bool | operator>= (const Iterator & other ) const |
| bool | operator>= (const ConstIterator & other ) const |
The QCborMap::ConstIterator 类提供 STL 样式 const 迭代器为 QCborMap .
QCborMap::ConstIterator allows you to iterate over a QCborMap . If you want to modify the QCborMap as you iterate over it, you must use QCborMap::Iterator instead. It is generally good practice to use QCborMap::ConstIterator , even on a non-const QCborMap , when you don't need to change the QCborMap through the iterator. Const iterators are slightly faster and improve code readability.
You must initialize the iterator using a QCborMap function like QCborMap::begin (), QCborMap::end ()，或 QCborMap::find () before you can start iterating..
Multiple iterators can be used on the same object. Existing iterators will however become dangling if the object gets modified.
另请参阅 QCborMap::Iterator .
同义词 std::random_access_iterator_tag indicating this iterator is a random-access iterator.
返回
true
if the entry in the map pointed to by this iterator occurs after or is the same entry as is pointed to by the
other
iterator.
返回
true
if the entry in the map pointed to by this iterator occurs after the entry pointed to by the
other
iterator.
返回
true
if the entry in the map pointed to by this iterator occurs before or is the same entry as is pointed to by the
other
iterator.
返回
true
if the entry in the map pointed to by this iterator occurs before the entry pointed to by the
other
iterator.
返回
true
if
other
points to a different entry in the map than this iterator; otherwise returns
false
.
另请参阅 operator== ().
返回
true
if
other
points to the same entry in the map as this iterator; otherwise returns
false
.
另请参阅 operator!= ().
Constructs an uninitialized iterator.
Functions like key (), value (), and operator++() must not be called on an uninitialized iterator. Use operator=() to assign a value to it before using it.
另请参阅 QCborMap::constBegin () 和 QCborMap::constEnd ().
Constructs an iterator as a copy of other .
Returns the current item's key.
另请参阅 value ().
Returns the current item's value.
Returns a pair containing the curent item's key and value.
Returns an iterator to the item at j positions forward from this iterator. If j is negative, the iterator goes backward.
另请参阅 operator- ().
The prefix ++ operator,
++i
, advances the iterator to the next item in the map and returns this iterator.
Calling this function on QCborMap::end () leads to undefined results.
另请参阅 operator-- ().
这是重载函数。
The postfix ++ operator,
i++
, advances the iterator to the next item in the map and returns an iterator to the previously current item.
Advances the iterator by j items. If j is negative, the iterator goes backward. Returns a reference to this iterator.
另请参阅 operator-= () 和 operator+ ().
Returns an iterator to the item at j positions backward from this iterator. If j is negative, the iterator goes forward.
另请参阅 operator+ ().
Returns the position of the item at iterator j relative to the item at this iterator. If the item at j is forward of this time, the returned value is negative.
另请参阅 operator+ ().
The prefix -- operator,
--i
, makes the preceding item current and returns this iterator.
Calling this function on QCborMap::begin () leads to undefined results.
另请参阅 operator++ ().
这是重载函数。
The postfix -- operator,
i--
, makes the preceding item current and returns an iterator pointing to the previously current item.
Makes the iterator go back by j items. If j is negative, the iterator goes forward. Returns a reference to this iterator.
另请参阅 operator+= () 和 operator- ().
Returns a pointer to the current pair's value.
Makes this iterator a copy of other and returns a reference to this iterator.
