std::reverse_iterator< _Iterator >(3cxstd::reverse_iterator< _Iterator >(3cxx)
NAME
std::reverse_iterator< _Iterator >
SYNOPSIS
Inherits std::iterator< iterator_traits< _Iterator
>::iterator_category, iterator_traits< _Iterator >::value_type,
iterator_traits< _Iterator >::difference_type, iterator_traits<
_Iterator >::pointer, iterator_traits< _Iterator >::reference >.
Public Types
typedef __traits_type::difference_type difference_type
typedef iterator_traits< _Iterator >::iterator_category
iterator_category
One of the tag types.
typedef _Iterator iterator_type
typedef __traits_type::pointer pointer
typedef __traits_type::reference reference
typedef iterator_traits< _Iterator >::value_type value_type
The type 'pointed to' by the iterator.
Public Member Functions
constexpr reverse_iterator ()
constexpr reverse_iterator (const reverse_iterator &__x)
template<typename _Iter > constexpr reverse_iterator (const
reverse_iterator< _Iter > &__x)
constexpr reverse_iterator (iterator_type __x)
constexpr iterator_type base () const
constexpr reference operator* () const
constexpr reverse_iterator operator+ (difference_type __n) const
constexpr reverse_iterator & operator++ ()
constexpr reverse_iterator operator++ (int)
constexpr reverse_iterator & operator+= (difference_type __n)
constexpr reverse_iterator operator- (difference_type __n) const
constexpr reverse_iterator & operator-- ()
constexpr reverse_iterator operator-- (int)
constexpr reverse_iterator & operator-= (difference_type __n)
constexpr pointer operator-> () const
reverse_iterator & operator= (const reverse_iterator &)=default
template<typename _Iter > constexpr reverse_iterator & operator= (const
reverse_iterator< _Iter > &__x)
constexpr reference operator[] (difference_type __n) const
Protected Types
typedef iterator_traits< _Iterator > __traits_type
Protected Attributes
_Iterator current
Detailed Description
template<typename _Iterator>
class std::reverse_iterator< _Iterator >" Bidirectional and random
access iterators have corresponding reverse iterator adaptors that
iterate through the data structure in the opposite direction. They have
the same signatures as the corresponding iterators. The fundamental
relation between a reverse iterator and its corresponding iterator i is
established by the identity:
&*(reverse_iterator(i)) == &*(i - 1)
This mapping is dictated by the fact that while there is always a
pointer past the end of an array, there might not be a valid pointer
before the beginning of an array. [24.4.1]/1,2
Reverse iterators can be tricky and surprising at first. Their
semantics make sense, however, and the trickiness is a side effect of
the requirement that the iterators must be safe.
Member Typedef Documentation
typedef iterator_traits< _Iterator >::iterator_category std::iterator<
iterator_traits< _Iterator >::iterator_category , iterator_traits<
_Iterator >::value_type , iterator_traits< _Iterator >::difference_type
, iterator_traits< _Iterator >::pointer , iterator_traits< _Iterator
>::reference >::iterator_category [inherited]
One of the tag types.
typedef iterator_traits< _Iterator >::value_type std::iterator<
iterator_traits< _Iterator >::iterator_category , iterator_traits<
_Iterator >::value_type , iterator_traits< _Iterator >::difference_type
, iterator_traits< _Iterator >::pointer , iterator_traits< _Iterator
>::reference >::value_type [inherited]
The type 'pointed to' by the iterator.
Constructor & Destructor Documentation
template<typename _Iterator > constexpr std::reverse_iterator< _Iterator
>::reverse_iterator () [inline], [constexpr]
The default constructor value-initializes member current. If it is a
pointer, that means it is zero-initialized.
template<typename _Iterator > constexpr std::reverse_iterator< _Iterator
>::reverse_iterator (iterator_type __x) [inline], [explicit],
[constexpr]
This iterator will move in the opposite direction that x does.
template<typename _Iterator > constexpr std::reverse_iterator< _Iterator
>::reverse_iterator (const reverse_iterator< _Iterator > & __x)
[inline], [constexpr]
The copy constructor is normal.
template<typename _Iterator > template<typename _Iter > constexpr
std::reverse_iterator< _Iterator >::reverse_iterator (const
reverse_iterator< _Iter > & __x) [inline], [constexpr]
A reverse_iterator across other types can be copied if the underlying
iterator can be converted to the type of current.
Member Function Documentation
template<typename _Iterator > constexpr iterator_type
std::reverse_iterator< _Iterator >::base () const [inline],
[constexpr]
Returns
current, the iterator used for underlying work.
template<typename _Iterator > constexpr reference std::reverse_iterator<
_Iterator >::operator* () const [inline], [constexpr]
Returns
A reference to the value at --current
This requires that --current is dereferenceable.
Warning
This implementation requires that for an iterator of the underlying
iterator type, x, a reference obtained by *x remains valid after x
has been modified or destroyed. This is a bug:
http://gcc.gnu.org/PR51823
template<typename _Iterator > constexpr reverse_iterator
std::reverse_iterator< _Iterator >::operator+ (difference_type __n)
const [inline], [constexpr]
Returns
A reverse_iterator that refers to current - __n
The underlying iterator must be a Random Access Iterator.
template<typename _Iterator > constexpr reverse_iterator&
std::reverse_iterator< _Iterator >::operator++ () [inline],
[constexpr]
Returns
*this
Decrements the underlying iterator.
template<typename _Iterator > constexpr reverse_iterator
std::reverse_iterator< _Iterator >::operator++ (int) [inline],
[constexpr]
Returns
The original value of *this
Decrements the underlying iterator.
template<typename _Iterator > constexpr reverse_iterator&
std::reverse_iterator< _Iterator >::operator+= (difference_type __n)
[inline], [constexpr]
Returns
*this
Moves the underlying iterator backwards __n steps. The underlying
iterator must be a Random Access Iterator.
template<typename _Iterator > constexpr reverse_iterator
std::reverse_iterator< _Iterator >::operator- (difference_type __n)
const [inline], [constexpr]
Returns
A reverse_iterator that refers to current - __n
The underlying iterator must be a Random Access Iterator.
template<typename _Iterator > constexpr reverse_iterator&
std::reverse_iterator< _Iterator >::operator-- () [inline],
[constexpr]
Returns
*this
Increments the underlying iterator.
template<typename _Iterator > constexpr reverse_iterator
std::reverse_iterator< _Iterator >::operator-- (int) [inline],
[constexpr]
Returns
A reverse_iterator with the previous value of *this
Increments the underlying iterator.
template<typename _Iterator > constexpr reverse_iterator&
std::reverse_iterator< _Iterator >::operator-= (difference_type __n)
[inline], [constexpr]
Returns
*this
Moves the underlying iterator forwards __n steps. The underlying
iterator must be a Random Access Iterator.
template<typename _Iterator > constexpr pointer std::reverse_iterator<
_Iterator >::operator-> () const [inline], [constexpr]
Returns
A pointer to the value at --current
This requires that --current is dereferenceable.
template<typename _Iterator > constexpr reference std::reverse_iterator<
_Iterator >::operator[] (difference_type __n) const [inline],
[constexpr]
Returns
The value at current - __n - 1
The underlying iterator must be a Random Access Iterator.
Author
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