std::unordered_set<; _Valustd::unordered_set<l_Value,)_Hash, _Pred, _Alloc >(3)
NAME
std::unordered_set< _Value, _Hash, _Pred, _Alloc > -
SYNOPSIS
Inherits std::__allow_copy_cons< bool >.
Public Types
typedef _Hashtable::key_type key_type
typedef _Hashtable::value_type value_type
typedef _Hashtable::hasher hasher
typedef _Hashtable::key_equal key_equal
typedef _Hashtable::allocator_type allocator_type
typedef allocator_type::pointer pointer
typedef
allocator_type::const_pointer const_pointer"
typedef allocator_type::reference reference
typedef
allocator_type::const_reference const_reference"
typedef _Hashtable::iterator iterator
typedef _Hashtable::const_iterator const_iterator
typedef _Hashtable::local_iterator local_iterator
typedef
_Hashtable::const_local_iterator const_local_iterator"
typedef _Hashtable::size_type size_type
typedef _Hashtable::difference_type difference_type
Public Member Functions
unordered_set (size_type __n=10, const hasher &__hf=hasher(), const
key_equal &__eql=key_equal(), const allocator_type
&__a=allocator_type())
template<typename _InputIterator > unordered_set (_InputIterator __f,
_InputIterator __l, size_type __n=0, const hasher &__hf=hasher(),
const key_equal &__eql=key_equal(), const allocator_type
&__a=allocator_type())
unordered_set (const unordered_set &)=default
unordered_set (unordered_set &&)=default
unordered_set (initializer_list< value_type > __l, size_type __n=0,
const hasher &__hf=hasher(), const key_equal &__eql=key_equal(),
const allocator_type &__a=allocator_type())
size_type bucket (const key_type &__key) const
size_type bucket_count () const noexcept
size_type bucket_size (size_type __n) const
const_iterator cbegin () const noexcept
const_iterator cend () const noexcept
void clear () noexcept
size_type count (const key_type &__x) const
template<typename... _Args> std::pair< iterator, bool > emplace (_Args
&&...__args)
template<typename... _Args> iterator emplace_hint (const_iterator
__pos, _Args &&...__args)
bool empty () const noexcept
size_type erase (const key_type &__x)
iterator erase (const_iterator __first, const_iterator __last)
allocator_type get_allocator () const noexcept
hasher hash_function () const
template<typename _InputIterator > void insert (_InputIterator __first,
_InputIterator __last)
void insert (initializer_list< value_type > __l)
key_equal key_eq () const
float load_factor () const noexcept
size_type max_bucket_count () const noexcept
float max_load_factor () const noexcept
void max_load_factor (float __z)
size_type max_size () const noexcept
unordered_set & operator= (const unordered_set &)=default
unordered_set & operator= (unordered_set &&)=default
unordered_set & operator= (initializer_list< value_type > __l)
void rehash (size_type __n)
void reserve (size_type __n)
size_type size () const noexcept
void swap (unordered_set &__x)
iterator begin () noexcept
const_iterator begin () const noexcept
iterator end () noexcept
const_iterator end () const noexcept
std::pair< iterator, bool > insert (const value_type &__x)
std::pair< iterator, bool > insert (value_type &&__x)
iterator insert (const_iterator __hint, const value_type &__x)
iterator insert (const_iterator __hint, value_type &&__x)
iterator erase (const_iterator __position)
iterator erase (iterator __it)
iterator find (const key_type &__x)
const_iterator find (const key_type &__x) const
std::pair< iterator, iterator > equal_range (const key_type &__x)
std::pair< const_iterator,
const_iterator > equal_range (const key_type &__x) const "
local_iterator begin (size_type __n)
const_local_iterator begin (size_type __n) const
const_local_iterator cbegin (size_type __n) const
local_iterator end (size_type __n)
const_local_iterator end (size_type __n) const
const_local_iterator cend (size_type __n) const
Friends
template<typename _Value1 , typename _Hash1 , typename _Pred1 ,
typename _Alloc1 > bool operator== (const unordered_set< _Value1,
_Hash1, _Pred1, _Alloc1 > &, const unordered_set< _Value1, _Hash1,
_Pred1, _Alloc1 > &)
Detailed Description
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>>class
std::unordered_set< _Value, _Hash, _Pred, _Alloc >
A standard container composed of unique keys (containing at most one of
each key value) in which the elements' keys are the elements
themselves.
Template Parameters:
_Value Type of key objects.
_Hash Hashing function object type, defaults to hash<_Value>.
_Pred Predicate function object type, defaults to equal_to<_Value>.
_Alloc Allocator type, defaults to allocator<_Key>.
Meets the requirements of a container, and unordered associative
container
Base is _Hashtable, dispatched at compile time via template alias
__uset_hashtable.
Definition at line 93 of file unordered_set.h.
Member Typedef Documentation
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> typedef
_Hashtable::allocator_type std::unordered_set< _Value, _Hash, _Pred,
_Alloc >::allocator_type
Public typedefs.
Definition at line 106 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> typedef
_Hashtable::const_iterator std::unordered_set< _Value, _Hash, _Pred,
_Alloc >::const_iterator
Iterator-related typedefs.
Definition at line 116 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> typedef
_Hashtable::const_local_iterator std::unordered_set< _Value, _Hash,
_Pred, _Alloc >::const_local_iterator
Iterator-related typedefs.
Definition at line 118 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> typedef
allocator_type::const_pointer std::unordered_set< _Value, _Hash, _Pred,
_Alloc >::const_pointer
Iterator-related typedefs.
Definition at line 112 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> typedef
allocator_type::const_reference std::unordered_set< _Value, _Hash,
_Pred, _Alloc >::const_reference
Iterator-related typedefs.
Definition at line 114 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> typedef
_Hashtable::difference_type std::unordered_set< _Value, _Hash, _Pred,
_Alloc >::difference_type
Iterator-related typedefs.
Definition at line 120 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> typedef
_Hashtable::hasher std::unordered_set< _Value, _Hash, _Pred, _Alloc
>::hasher
Public typedefs.
Definition at line 104 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> typedef
_Hashtable::iterator std::unordered_set< _Value, _Hash, _Pred, _Alloc
>::iterator
Iterator-related typedefs.
Definition at line 115 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> typedef
_Hashtable::key_equal std::unordered_set< _Value, _Hash, _Pred, _Alloc
>::key_equal
Public typedefs.
Definition at line 105 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> typedef
_Hashtable::key_type std::unordered_set< _Value, _Hash, _Pred, _Alloc
>::key_type
Public typedefs.
Definition at line 102 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> typedef
_Hashtable::local_iterator std::unordered_set< _Value, _Hash, _Pred,
_Alloc >::local_iterator
Iterator-related typedefs.
Definition at line 117 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> typedef
allocator_type::pointer std::unordered_set< _Value, _Hash, _Pred,
_Alloc >::pointer
Iterator-related typedefs.
Definition at line 111 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> typedef
allocator_type::reference std::unordered_set< _Value, _Hash, _Pred,
_Alloc >::reference
Iterator-related typedefs.
Definition at line 113 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> typedef
_Hashtable::size_type std::unordered_set< _Value, _Hash, _Pred, _Alloc
>::size_type
Iterator-related typedefs.
Definition at line 119 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> typedef
_Hashtable::value_type std::unordered_set< _Value, _Hash, _Pred, _Alloc
>::value_type
Public typedefs.
Definition at line 103 of file unordered_set.h.
Constructor & Destructor Documentation
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>>
std::unordered_set< _Value, _Hash, _Pred, _Alloc >::unordered_set
(size_type__n = 10, const hasher &__hf = hasher(), const key_equal
&__eql = key_equal(), const allocator_type &__a = allocator_type())
[inline], [explicit]
Default constructor creates no elements.
Parameters:
__n Initial number of buckets.
__hf A hash functor.
__eql A key equality functor.
__a An allocator object.
Definition at line 132 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>>
template<typename _InputIterator > std::unordered_set< _Value, _Hash,
_Pred, _Alloc >::unordered_set (_InputIterator__f, _InputIterator__l,
size_type__n = 0, const hasher &__hf = hasher(), const key_equal &__eql
= key_equal(), const allocator_type &__a = allocator_type()) [inline]
Builds an unordered_set from a range.
Parameters:
__first An input iterator.
__last An input iterator.
__n Minimal initial number of buckets.
__hf A hash functor.
__eql A key equality functor.
__a An allocator object.
Create an unordered_set consisting of copies of the elements from
[__first,__last). This is linear in N (where N is
distance(__first,__last)).
Definition at line 153 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>>
std::unordered_set< _Value, _Hash, _Pred, _Alloc >::unordered_set
(const unordered_set< _Value, _Hash, _Pred, _Alloc > &) [default]
Copy constructor.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>>
std::unordered_set< _Value, _Hash, _Pred, _Alloc >::unordered_set
(unordered_set< _Value, _Hash, _Pred, _Alloc > &&) [default]
Move constructor.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>>
std::unordered_set< _Value, _Hash, _Pred, _Alloc >::unordered_set
(initializer_list< value_type >__l, size_type__n = 0, const hasher
&__hf = hasher(), const key_equal &__eql = key_equal(), const
allocator_type &__a = allocator_type()) [inline]
Builds an unordered_set from an initializer_list.
Parameters:
__l An initializer_list.
__n Minimal initial number of buckets.
__hf A hash functor.
__eql A key equality functor.
__a An allocator object.
Create an unordered_set consisting of copies of the elements in the
list. This is linear in N (where N is __l.size()).
Definition at line 178 of file unordered_set.h.
Member Function Documentation
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> iterator
std::unordered_set< _Value, _Hash, _Pred, _Alloc >::begin () [inline],
[noexcept]
Returns a read-only (constant) iterator that points to the first
element in the unordered_set.
Definition at line 243 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>>
const_iterator std::unordered_set< _Value, _Hash, _Pred, _Alloc
>::begin () const [inline], [noexcept]
Returns a read-only (constant) iterator that points to the first
element in the unordered_set.
Definition at line 247 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>>
local_iterator std::unordered_set< _Value, _Hash, _Pred, _Alloc
>::begin (size_type__n) [inline]
Returns a read-only (constant) iterator pointing to the first bucket
element.
Parameters:
__n The bucket index.
Returns:
A read-only local iterator.
Definition at line 593 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>>
const_local_iterator std::unordered_set< _Value, _Hash, _Pred, _Alloc
>::begin (size_type__n) const [inline]
Returns a read-only (constant) iterator pointing to the first bucket
element.
Parameters:
__n The bucket index.
Returns:
A read-only local iterator.
Definition at line 597 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> size_type
std::unordered_set< _Value, _Hash, _Pred, _Alloc >::bucket_count ()
const [inline], [noexcept]
Returns the number of buckets of the unordered_set.
Definition at line 559 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>>
const_iterator std::unordered_set< _Value, _Hash, _Pred, _Alloc
>::cbegin () const [inline], [noexcept]
Returns a read-only (constant) iterator that points to the first
element in the unordered_set.
Definition at line 270 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>>
const_local_iterator std::unordered_set< _Value, _Hash, _Pred, _Alloc
>::cbegin (size_type__n) const [inline]
Returns a read-only (constant) iterator pointing to the first bucket
element.
Parameters:
__n The bucket index.
Returns:
A read-only local iterator.
Definition at line 601 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>>
const_iterator std::unordered_set< _Value, _Hash, _Pred, _Alloc >::cend
() const [inline], [noexcept]
Returns a read-only (constant) iterator that points one past the last
element in the unordered_set.
Definition at line 278 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>>
const_local_iterator std::unordered_set< _Value, _Hash, _Pred, _Alloc
>::cend (size_type__n) const [inline]
Returns a read-only (constant) iterator pointing to one past the last
bucket elements.
Parameters:
__n The bucket index.
Returns:
A read-only local iterator.
Definition at line 621 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> void
std::unordered_set< _Value, _Hash, _Pred, _Alloc >::clear () [inline],
[noexcept]
Erases all elements in an unordered_set. Note that this function only
erases the elements, and that if the elements themselves are pointers,
the pointed-to memory is not touched in any way. Managing the pointer
is the user's responsibility.
Definition at line 471 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> size_type
std::unordered_set< _Value, _Hash, _Pred, _Alloc >::count (const
key_type &__x) const [inline]
Finds the number of elements.
Parameters:
__x Element to located.
Returns:
Number of elements with specified key.
This function only makes sense for unordered_multisets; for
unordered_set the result will either be 0 (not present) or 1 (present).
Definition at line 534 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>>
template<typename... _Args> std::pair<iterator, bool>
std::unordered_set< _Value, _Hash, _Pred, _Alloc >::emplace (_Args
&&...__args) [inline]
Attempts to build and insert an element into the unordered_set.
Parameters:
__args Arguments used to generate an element.
Returns:
A pair, of which the first element is an iterator that points to
the possibly inserted element, and the second is a bool that is
true if the element was actually inserted.
This function attempts to build and insert an element into the
unordered_set. An unordered_set relies on unique keys and thus an
element is only inserted if it is not already present in the
unordered_set.
Insertion requires amortized constant time.
Definition at line 300 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>>
template<typename... _Args> iterator std::unordered_set< _Value, _Hash,
_Pred, _Alloc >::emplace_hint (const_iterator__pos, _Args &&...__args)
[inline]
Attempts to insert an element into the unordered_set.
Parameters:
__pos An iterator that serves as a hint as to where the element
should be inserted.
__args Arguments used to generate the element to be inserted.
Returns:
An iterator that points to the element with key equivalent to the
one generated from __args (may or may not be the element itself).
This function is not concerned about whether the insertion took place,
and thus does not return a boolean like the single-argument emplace()
does. Note that the first parameter is only a hint and can potentially
improve the performance of the insertion process. A bad hint would
cause no gains in efficiency.
For more on hinting, see:
http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt07ch17.html
Insertion requires amortized constant time.
Definition at line 326 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> bool
std::unordered_set< _Value, _Hash, _Pred, _Alloc >::empty () const
[inline], [noexcept]
Returns true if the unordered_set is empty.
Definition at line 222 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> iterator
std::unordered_set< _Value, _Hash, _Pred, _Alloc >::end () [inline],
[noexcept]
Returns a read-only (constant) iterator that points one past the last
element in the unordered_set.
Definition at line 257 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>>
const_iterator std::unordered_set< _Value, _Hash, _Pred, _Alloc >::end
() const [inline], [noexcept]
Returns a read-only (constant) iterator that points one past the last
element in the unordered_set.
Definition at line 261 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>>
local_iterator std::unordered_set< _Value, _Hash, _Pred, _Alloc >::end
(size_type__n) [inline]
Returns a read-only (constant) iterator pointing to one past the last
bucket elements.
Parameters:
__n The bucket index.
Returns:
A read-only local iterator.
Definition at line 613 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>>
const_local_iterator std::unordered_set< _Value, _Hash, _Pred, _Alloc
>::end (size_type__n) const [inline]
Returns a read-only (constant) iterator pointing to one past the last
bucket elements.
Parameters:
__n The bucket index.
Returns:
A read-only local iterator.
Definition at line 617 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>>
std::pair<iterator, iterator> std::unordered_set< _Value, _Hash, _Pred,
_Alloc >::equal_range (const key_type &__x) [inline]
Finds a subsequence matching given key.
Parameters:
__x Key to be located.
Returns:
Pair of iterators that possibly points to the subsequence matching
given key.
This function probably only makes sense for multisets.
Definition at line 547 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>>
std::pair<const_iterator, const_iterator> std::unordered_set< _Value,
_Hash, _Pred, _Alloc >::equal_range (const key_type &__x) const
[inline]
Finds a subsequence matching given key.
Parameters:
__x Key to be located.
Returns:
Pair of iterators that possibly points to the subsequence matching
given key.
This function probably only makes sense for multisets.
Definition at line 551 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> iterator
std::unordered_set< _Value, _Hash, _Pred, _Alloc >::erase
(const_iterator__position) [inline]
Erases an element from an unordered_set.
Parameters:
__position An iterator pointing to the element to be erased.
Returns:
An iterator pointing to the element immediately following
__position prior to the element being erased. If no such element
exists, end() is returned.
This function erases an element, pointed to by the given iterator, from
an unordered_set. Note that this function only erases the element, and
that if the element is itself a pointer, the pointed-to memory is not
touched in any way. Managing the pointer is the user's responsibility.
Definition at line 421 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> iterator
std::unordered_set< _Value, _Hash, _Pred, _Alloc >::erase
(iterator__it) [inline]
Erases an element from an unordered_set.
Parameters:
__position An iterator pointing to the element to be erased.
Returns:
An iterator pointing to the element immediately following
__position prior to the element being erased. If no such element
exists, end() is returned.
This function erases an element, pointed to by the given iterator, from
an unordered_set. Note that this function only erases the element, and
that if the element is itself a pointer, the pointed-to memory is not
touched in any way. Managing the pointer is the user's responsibility.
Definition at line 426 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> size_type
std::unordered_set< _Value, _Hash, _Pred, _Alloc >::erase (const
key_type &__x) [inline]
Erases elements according to the provided key.
Parameters:
__x Key of element to be erased.
Returns:
The number of elements erased.
This function erases all the elements located by the given key from an
unordered_set. For an unordered_set the result of this function can
only be 0 (not present) or 1 (present). Note that this function only
erases the element, and that if the element is itself a pointer, the
pointed-to memory is not touched in any way. Managing the pointer is
the user's responsibility.
Definition at line 443 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> iterator
std::unordered_set< _Value, _Hash, _Pred, _Alloc >::erase
(const_iterator__first, const_iterator__last) [inline]
Erases a [__first,__last) range of elements from an unordered_set.
Parameters:
__first Iterator pointing to the start of the range to be erased.
__last Iterator pointing to the end of the range to be erased.
Returns:
The iterator __last.
This function erases a sequence of elements from an unordered_set. Note
that this function only erases the element, and that if the element is
itself a pointer, the pointed-to memory is not touched in any way.
Managing the pointer is the user's responsibility.
Definition at line 461 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> iterator
std::unordered_set< _Value, _Hash, _Pred, _Alloc >::find (const
key_type &__x) [inline]
Tries to locate an element in an unordered_set.
Parameters:
__x Element to be located.
Returns:
Iterator pointing to sought-after element, or end() if not found.
This function takes a key and tries to locate the element with which
the key matches. If successful the function returns an iterator
pointing to the sought after element. If unsuccessful it returns the
past-the-end ( end() ) iterator.
Definition at line 516 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>>
const_iterator std::unordered_set< _Value, _Hash, _Pred, _Alloc >::find
(const key_type &__x) const [inline]
Tries to locate an element in an unordered_set.
Parameters:
__x Element to be located.
Returns:
Iterator pointing to sought-after element, or end() if not found.
This function takes a key and tries to locate the element with which
the key matches. If successful the function returns an iterator
pointing to the sought after element. If unsuccessful it returns the
past-the-end ( end() ) iterator.
Definition at line 520 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>>
allocator_type std::unordered_set< _Value, _Hash, _Pred, _Alloc
>::get_allocator () const [inline], [noexcept]
Returns the allocator object with which the unordered_set was
constructed.
Definition at line 215 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> hasher
std::unordered_set< _Value, _Hash, _Pred, _Alloc >::hash_function ()
const [inline]
Returns the hash functor object with which the unordered_set was
constructed.
Definition at line 492 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>>
std::pair<iterator, bool> std::unordered_set< _Value, _Hash, _Pred,
_Alloc >::insert (const value_type &__x) [inline]
Attempts to insert an element into the unordered_set.
Parameters:
__x Element to be inserted.
Returns:
A pair, of which the first element is an iterator that points to
the possibly inserted element, and the second is a bool that is
true if the element was actually inserted.
This function attempts to insert an element into the unordered_set. An
unordered_set relies on unique keys and thus an element is only
inserted if it is not already present in the unordered_set.
Insertion requires amortized constant time.
Definition at line 344 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>>
std::pair<iterator, bool> std::unordered_set< _Value, _Hash, _Pred,
_Alloc >::insert (value_type &&__x) [inline]
Attempts to insert an element into the unordered_set.
Parameters:
__x Element to be inserted.
Returns:
A pair, of which the first element is an iterator that points to
the possibly inserted element, and the second is a bool that is
true if the element was actually inserted.
This function attempts to insert an element into the unordered_set. An
unordered_set relies on unique keys and thus an element is only
inserted if it is not already present in the unordered_set.
Insertion requires amortized constant time.
Definition at line 348 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> iterator
std::unordered_set< _Value, _Hash, _Pred, _Alloc >::insert
(const_iterator__hint, const value_type &__x) [inline]
Attempts to insert an element into the unordered_set.
Parameters:
__hint An iterator that serves as a hint as to where the element
should be inserted.
__x Element to be inserted.
Returns:
An iterator that points to the element with key of __x (may or may
not be the element passed in).
This function is not concerned about whether the insertion took place,
and thus does not return a boolean like the single-argument insert()
does. Note that the first parameter is only a hint and can potentially
improve the performance of the insertion process. A bad hint would
cause no gains in efficiency.
For more on hinting, see:
http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt07ch17.html
Insertion requires amortized constant.
Definition at line 373 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> iterator
std::unordered_set< _Value, _Hash, _Pred, _Alloc >::insert
(const_iterator__hint, value_type &&__x) [inline]
Attempts to insert an element into the unordered_set.
Parameters:
__hint An iterator that serves as a hint as to where the element
should be inserted.
__x Element to be inserted.
Returns:
An iterator that points to the element with key of __x (may or may
not be the element passed in).
This function is not concerned about whether the insertion took place,
and thus does not return a boolean like the single-argument insert()
does. Note that the first parameter is only a hint and can potentially
improve the performance of the insertion process. A bad hint would
cause no gains in efficiency.
For more on hinting, see:
http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt07ch17.html
Insertion requires amortized constant.
Definition at line 377 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>>
template<typename _InputIterator > void std::unordered_set< _Value,
_Hash, _Pred, _Alloc >::insert (_InputIterator__first,
_InputIterator__last) [inline]
A template function that attempts to insert a range of elements.
Parameters:
__first Iterator pointing to the start of the range to be inserted.
__last Iterator pointing to the end of the range.
Complexity similar to that of the range constructor.
Definition at line 392 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> void
std::unordered_set< _Value, _Hash, _Pred, _Alloc >::insert
(initializer_list< value_type >__l) [inline]
Attempts to insert a list of elements into the unordered_set.
Parameters:
__l A std::initializer_list<value_type> of elements to be inserted.
Complexity similar to that of the range constructor.
Definition at line 403 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> key_equal
std::unordered_set< _Value, _Hash, _Pred, _Alloc >::key_eq () const
[inline]
Returns the key comparison object with which the unordered_set was
constructed.
Definition at line 498 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> float
std::unordered_set< _Value, _Hash, _Pred, _Alloc >::load_factor ()
const [inline], [noexcept]
Returns the average number of elements per bucket.
Definition at line 629 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> size_type
std::unordered_set< _Value, _Hash, _Pred, _Alloc >::max_bucket_count ()
const [inline], [noexcept]
Returns the maximum number of buckets of the unordered_set.
Definition at line 564 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> float
std::unordered_set< _Value, _Hash, _Pred, _Alloc >::max_load_factor ()
const [inline], [noexcept]
Returns a positive number that the unordered_set tries to keep the load
factor less than or equal to.
Definition at line 635 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> void
std::unordered_set< _Value, _Hash, _Pred, _Alloc >::max_load_factor
(float__z) [inline]
Change the unordered_set maximum load factor.
Parameters:
__z The new maximum load factor.
Definition at line 643 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> size_type
std::unordered_set< _Value, _Hash, _Pred, _Alloc >::max_size () const
[inline], [noexcept]
Returns the maximum size of the unordered_set.
Definition at line 232 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>>
unordered_set& std::unordered_set< _Value, _Hash, _Pred, _Alloc
>::operator= (const unordered_set< _Value, _Hash, _Pred, _Alloc > &)
[default]
Copy assignment operator.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>>
unordered_set& std::unordered_set< _Value, _Hash, _Pred, _Alloc
>::operator= (unordered_set< _Value, _Hash, _Pred, _Alloc > &&)
[default]
Move assignment operator.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>>
unordered_set& std::unordered_set< _Value, _Hash, _Pred, _Alloc
>::operator= (initializer_list< value_type >__l) [inline]
Unordered_set list assignment operator.
Parameters:
__l An initializer_list.
This function fills an unordered_set with copies of the elements in the
initializer list __l.
Note that the assignment completely changes the unordered_set and that
the resulting unordered_set's size is the same as the number of
elements assigned. Old data may be lost.
Definition at line 206 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> void
std::unordered_set< _Value, _Hash, _Pred, _Alloc >::rehash
(size_type__n) [inline]
May rehash the unordered_set.
Parameters:
__n The new number of buckets.
Rehash will occur only if the new number of buckets respect the
unordered_set maximum load factor.
Definition at line 654 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> void
std::unordered_set< _Value, _Hash, _Pred, _Alloc >::reserve
(size_type__n) [inline]
Prepare the unordered_set for a specified number of elements.
Parameters:
__n Number of elements required.
Same as rehash(ceil(n / max_load_factor())).
Definition at line 665 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> size_type
std::unordered_set< _Value, _Hash, _Pred, _Alloc >::size () const
[inline], [noexcept]
Returns the size of the unordered_set.
Definition at line 227 of file unordered_set.h.
template<class _Value, class _Hash = hash<_Value>, class _Pred =
std::equal_to<_Value>, class _Alloc = std::allocator<_Value>> void
std::unordered_set< _Value, _Hash, _Pred, _Alloc >::swap
(unordered_set< _Value, _Hash, _Pred, _Alloc > &__x) [inline]
Swaps data with another unordered_set.
Parameters:
__x An unordered_set of the same element and allocator types.
This exchanges the elements between two sets in constant time. Note
that the global std::swap() function is specialized such that
std::swap(s1,s2) will feed to this function.
Definition at line 484 of file unordered_set.h.
Author
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libstdc++ std::unordered_set<1_Value, _Hash, _Pred, _Alloc >(3)
