ConstIterator 類

class QCborArray ::ConstIterator

The QCborArray::ConstIterator 類提供 STL 樣式 const 迭代器為 QCborArray . 更多...

• 所有成員列錶，包括繼承成員
• ConstIterator is part of 在 Qt 中支持 CBOR .

此類 強烈可比較 .

此類 強烈可比較 with QCborArray::Iterator .

公共類型

iterator_category

公共函數

	ConstIterator ()
	ConstIterator (const QCborArray::ConstIterator & other )
QCborValueConstRef	operator* () const
QCborArray::ConstIterator	operator+ (qsizetype j ) const
QCborArray::ConstIterator &	operator++ ()
QCborArray::ConstIterator	operator++ (int)
QCborArray::ConstIterator &	operator+= (qsizetype j )
qsizetype	operator- (QCborArray::ConstIterator other ) const
QCborArray::ConstIterator	operator- (qsizetype j ) const
QCborArray::ConstIterator &	operator-- ()
QCborArray::ConstIterator	operator-- (int)
QCborArray::ConstIterator &	operator-= (qsizetype j )
const QCborValueConstRef *	operator-> () const
QCborArray::ConstIterator &	operator= (const QCborArray::ConstIterator & other )
QCborValueConstRef	operator[] (qsizetype j ) const

相關非成員

bool	operator!= (const QCborArray::ConstIterator & lhs , const QCborArray::ConstIterator & rhs )
bool	operator< (const QCborArray::ConstIterator & lhs , const QCborArray::ConstIterator & rhs )
bool	operator<= (const QCborArray::ConstIterator & lhs , const QCborArray::ConstIterator & rhs )
bool	operator== (const QCborArray::ConstIterator & lhs , const QCborArray::ConstIterator & rhs )
bool	operator> (const QCborArray::ConstIterator & lhs , const QCborArray::ConstIterator & rhs )
bool	operator>= (const QCborArray::ConstIterator & lhs , const QCborArray::ConstIterator & rhs )

詳細描述

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.

另請參閱 QCborArray::Iterator .

成員類型文檔編製

ConstIterator:: iterator_category

同義詞 std::random_access_iterator_tag indicating this iterator is a random access iterator.

成員函數文檔編製

[constexpr noexcept] ConstIterator:: ConstIterator ()

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.

另請參閱 QCborArray::constBegin () 和 QCborArray::constEnd ().

[constexpr noexcept] ConstIterator:: ConstIterator (const QCborArray::ConstIterator & other )

構造副本為 other .

QCborValueConstRef ConstIterator:: operator* () const

返迴當前項。

QCborArray::ConstIterator ConstIterator:: operator+ ( qsizetype j ) const

Returns an iterator to the item at a position j steps forward from this iterator. If j is negative, the iterator goes backward.

另請參閱 operator- () 和 operator+= ().

QCborArray::ConstIterator &ConstIterator:: operator++ ()

前綴 ++ 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.

另請參閱 operator-- ().

QCborArray::ConstIterator ConstIterator:: operator++ ( int )

這是重載函數。

The postfix ++ operator, it++ , advances the iterator to the next item in the array and returns an iterator to the previously current item.

QCborArray::ConstIterator &ConstIterator:: operator+= ( qsizetype j )

推進迭代器 j positions. If j is negative, the iterator goes backward. Returns a reference to this iterator.

另請參閱 operator-= () 和 operator+ ().

qsizetype ConstIterator:: operator- ( QCborArray::ConstIterator other ) const

Returns the offset of this iterator relative to other .

QCborArray::ConstIterator ConstIterator:: operator- ( qsizetype j ) const

Returns an iterator to the item at a position j steps backward from this iterator. If j is negative, the iterator goes forward.

另請參閱 operator+ () 和 operator-= ().

QCborArray::ConstIterator &ConstIterator:: operator-- ()

前綴 -- operator, --it , makes the preceding item current and returns this iterator.

Calling this function on QCborArray::begin () leads to undefined results.

另請參閱 operator++ ().

QCborArray::ConstIterator ConstIterator:: operator-- ( int )

這是重載函數。

The postfix -- operator, it-- , makes the preceding item current and returns an iterator to the previously current item.

QCborArray::ConstIterator &ConstIterator:: operator-= ( qsizetype j )

Makes the iterator go back by j positions. If j is negative, the iterator goes forward. Returns a reference to this iterator.

另請參閱 operator+= () 和 operator- ().

const QCborValueConstRef *ConstIterator:: operator-> () const

Returns a pointer to the current item.

QCborArray::ConstIterator &ConstIterator:: operator= (const QCborArray::ConstIterator & other )

Makes this iterator a copy of other and returns a reference to this iterator.

QCborValueConstRef ConstIterator:: operator[] ( qsizetype j ) const

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.

另請參閱 operator+ ().

相關非成員

[noexcept] bool operator!= (const QCborArray::ConstIterator & lhs , const QCborArray::ConstIterator & rhs )

返迴 true if lhs points to a different entry in the array than rhs iterator; otherwise returns false .

另請參閱 operator== ().

[noexcept] bool operator< (const QCborArray::ConstIterator & lhs , const QCborArray::ConstIterator & rhs )

返迴 true if the entry in the array pointed to by lhs iterator occurs before the entry pointed to by the rhs iterator.

[noexcept] bool operator<= (const QCborArray::ConstIterator & lhs , const QCborArray::ConstIterator & rhs )

返迴 true if the entry in the array pointed to by lhs iterator occurs before or is the same entry as is pointed to by the rhs iterator.

[noexcept] bool operator== (const QCborArray::ConstIterator & lhs , const QCborArray::ConstIterator & rhs )

返迴 true if lhs points to the same entry in the array as rhs iterator; otherwise returns false .

另請參閱 operator!= ().

[noexcept] bool operator> (const QCborArray::ConstIterator & lhs , const QCborArray::ConstIterator & rhs )

返迴 true if the entry in the array pointed to by lhs iterator occurs after the entry pointed to by the rhs iterator.

[noexcept] bool operator>= (const QCborArray::ConstIterator & lhs , const QCborArray::ConstIterator & rhs )

返迴 true if the entry in the array pointed to by lhs iterator occurs after or is the same entry as is pointed to by the rhs iterator.

內容

1. 公共類型

2. 公共函數

3. 相關非成員

4. 詳細描述