The QCborArray::ConstIterator 类提供 STL 样式 const 迭代器为 QCborArray . 更多...
| 头： | #include <ConstIterator> |
| qmake: | QT += core |
| Since: | Qt 5.12 |
| typedef | iterator_category |
| ConstIterator () | |
| ConstIterator (const ConstIterator & other ) | |
| bool | operator!= (const Iterator & o ) const |
| bool | operator!= (const ConstIterator & o ) const |
| const QCborValueRef | operator* () const |
| ConstIterator | operator+ (qsizetype j ) const |
| ConstIterator & | operator++ () |
| ConstIterator | operator++ ( int ) |
| ConstIterator & | operator+= (qsizetype j ) |
| ConstIterator | operator- (qsizetype j ) const |
| qsizetype | operator- (ConstIterator other ) 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 |
| const QCborValueRef | operator[] (qsizetype j ) |
The QCborArray::ConstIterator 类提供 STL 样式 const 迭代器为 QCborArray .
QCborArray::ConstIterator allows you to iterate over a QCborArray . If you want to modify the QCborArray as you iterate over it, use QCborArray::Iterator instead. It is generally good practice to use QCborArray::ConstIterator , even on a non-const QCborArray , when you don't need to change the QCborArray through the iterator. Const iterators are slightly faster and improves code readability.
Iterators are initialized by using a QCborArray function like QCborArray::begin () 或 QCborArray::end (). Iteration is only possible after that.
Most QCborArray functions accept an integer index rather than an iterator. For that reason, iterators are rarely useful in connection with QCborArray . One place where STL-style iterators do make sense is as arguments to 一般算法 .
Multiple iterators can be used on the same array. However, be aware that any non-const function call performed on the QCborArray will render all existing iterators undefined.
另请参阅 QCborArray::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 array 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 array pointed to by this iterator occurs after the entry pointed to by the
other
iterator.
返回
true
if the entry in the array 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 array pointed to by this iterator occurs before the entry pointed to by the
other
iterator.
返回
true
if
o
points to a different entry in the array than this iterator; otherwise returns
false
.
另请参阅 operator== ().
返回
true
if
other
points to the same entry in the array as this iterator; otherwise returns
false
.
另请参阅 operator!= ().
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.
另请参阅 QCborArray::constBegin () 和 QCborArray::constEnd ().
构造副本为 other .
返回当前项。
Returns an iterator to the item at a position j steps forward from this iterator. If j is negative, the iterator goes backward.
另请参阅 operator- () 和 operator+= ().
The prefix ++ operator,
++it
, advances the iterator to the next item in the array and returns this iterator.
Calling this function on QCborArray::end () leads to undefined results.
另请参阅 operator-- ().
这是重载函数。
The postfix ++ operator,
it++
, advances the iterator to the next item in the array and returns an iterator to the previously current item.
Advances the iterator by j positions. 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 a position j steps backward from this iterator. If j is negative, the iterator goes forward.
另请参阅 operator+ () 和 operator-= ().
Returns the offset of this iterator relative to other .
The prefix -- operator,
--it
, makes the preceding item current and returns this iterator.
Calling this function on QCborArray::begin () leads to undefined results.
另请参阅 operator++ ().
这是重载函数。
The postfix -- operator,
it--
, makes the preceding item current and returns an iterator to the previously current item.
Makes the iterator go back by j positions. 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 item.
Makes this iterator a copy of other and returns a reference to this iterator.
Returns the item at a position j steps forward from the item pointed to by this iterator.
This function is provided to make QCborArray iterators behave like C++ pointers.
另请参阅 operator+ ().
