QKeyValueIterator 類

template <typename Key, typename T, typename Iterator, typename Traits = QtPrivate::QDefaultKeyValues<Key, T, Iterator>> class QKeyValueIterator

迭代關聯容器的鍵/值對。 更多...

頭：	#include <QKeyValueIterator>
CMake:	find_package(Qt6 REQUIRED COMPONENTS Core) target_link_libraries(mytarget PRIVATE Qt6::Core)
qmake:	QT += core

• 所有成員列錶，包括繼承成員

公共函數

	QKeyValueIterator ()
	QKeyValueIterator (Iterator o )
迭代器	base () const
std::pair<Key, T>	operator* () const
QKeyValueIterator<Key, T, Iterator, Traits> &	operator++ ()
QKeyValueIterator<Key, T, Iterator, Traits>	operator++ (int)
QKeyValueIterator<Key, T, Iterator, Traits> &	operator-- ()
QKeyValueIterator<Key, T, Iterator, Traits>	operator-- (int)
QKeyValueIterator<Key, T, Iterator, Traits>::pointer	operator-> () const

相關非成員

bool	operator!= (QKeyValueIterator<Key, T, Iterator, Traits> lhs , QKeyValueIterator<Key, T, Iterator, Traits> rhs )
bool	operator== (QKeyValueIterator<Key, T, Iterator, Traits> lhs , QKeyValueIterator<Key, T, Iterator, Traits> rhs )

詳細描述

The QKeyValueIterator class provides an STL-style iterator for returning key/value pairs from associative containers like QHash and QMap . It supports the same API as the STL associative containers, i.e. getting a key/value pair when iterating through the container.

This will allow for better interoperability between QMap , QHash and friends and STL-style algorithms.

警告： Iterators on implicitly shared containers do not work exactly like STL-iterators. You should avoid copying a container while iterators are active on that container. For more information, read 隱式共享迭代器問題 .

成員函數文檔編製

QKeyValueIterator:: QKeyValueIterator ()

構造默認 QKeyValueIterator。

[explicit constexpr noexcept(...)] QKeyValueIterator:: QKeyValueIterator ( Iterator o )

Constructs a QKeyValueIterator on top of o .

注意： This function is noexcept when std::is_nothrow_move_constructible<Iterator>::value is true .

Iterator QKeyValueIterator:: base () const

Returns the underlying iterator this QKeyValueIterator is based on.

std::pair < Key , T > QKeyValueIterator:: operator* () const

成對返迴當前條目。

QKeyValueIterator < Key , T , Iterator , Traits > &QKeyValueIterator:: operator++ ()

前綴 ++ 運算符 ( ++i ) advances the iterator to the next item in the container and returns the iterator.

注意： Advancing the iterator past its container's end() constitutes undefined behavior.

另請參閱 operator-- ().

QKeyValueIterator < Key , T , Iterator , Traits > QKeyValueIterator:: operator++ ( int )

The postfix ++ 運算符 ( i++ ) advances the iterator to the next item in the container and returns the iterator's prior value.

注意： Advancing the iterator past its container's end() constitutes undefined behavior.

這是重載函數。

QKeyValueIterator < Key , T , Iterator , Traits > &QKeyValueIterator:: operator-- ()

The prefix c{–} operator ( --i ) backs the iterator up to the previous item in the container and returns the iterator.

注意： Backing up an iterator to before its container's begin() constitutes undefined behavior.

另請參閱 operator++ ().

QKeyValueIterator < Key , T , Iterator , Traits > QKeyValueIterator:: operator-- ( int )

The postfix c{–} operator ( i-- ) backs the iterator up to the previous item in the container and returns the iterator's prior value.

注意： Backing up an iterator to before its container's begin() constitutes undefined behavior.

這是重載函數。

QKeyValueIterator < Key , T , Iterator , Traits > ::pointer QKeyValueIterator:: operator-> () const

Returns the current entry as a pointer-like object to the pair.

另請參閱 operator* ().

相關非成員

[noexcept] bool operator!= ( QKeyValueIterator < Key , T , Iterator , Traits > lhs , QKeyValueIterator < Key , T , Iterator , Traits > rhs )

返迴 true if rhs points to a different item than lhs otherwise returns false .

另請參閱 operator== ().

[noexcept] bool operator== ( QKeyValueIterator < Key , T , Iterator , Traits > lhs , QKeyValueIterator < Key , T , Iterator , Traits > rhs )

返迴 true if rhs points to the same item as lhs otherwise returns false .

另請參閱 operator!= ().

內容

1. 公共函數

2. 相關非成員

3. 詳細描述