std::multiset< Key, Compare, Alloc > Class Template Reference
[Containers, Associative Containers]

A standard container made up of elements, which can be retrieved in logarithmic time. More...

#include <stl_multiset.h>

Inheritance diagram for std::multiset< Key, Compare, Alloc >:

[legend]Collaboration diagram for std::multiset< Key, Compare, Alloc >:

[legend]List of all members.

pair< iterator, iterator >	equal_range (const key_type &x)
	Finds a subsequence matching given key.
pair< const_iterator, const_iterator >	equal_range (const key_type &x) const
	Finds a subsequence matching given key.
template<class K1, class C1, class A1>
bool	operator== (const multiset< K1, C1, A1 > &, const multiset< K1, C1, A1 > &)
	Finds a subsequence matching given key.
template<class K1, class C1, class A1>
bool	operator< (const multiset< K1, C1, A1 > &, const multiset< K1, C1, A1 > &)
	Finds a subsequence matching given key.
Public Types
typedef Key	key_type
typedef Key	value_type
typedef Compare	key_compare
typedef Compare	value_compare
typedef Alloc::pointer	pointer
typedef Alloc::const_pointer	const_pointer
typedef Alloc::reference	reference
typedef Alloc::const_reference	const_reference
typedef Rep_type::const_iterator	iterator
typedef Rep_type::const_iterator	const_iterator
typedef Rep_type::const_reverse_iterator	reverse_iterator
typedef Rep_type::const_reverse_iterator	const_reverse_iterator
typedef Rep_type::size_type	size_type
typedef Rep_type::difference_type	difference_type
typedef Rep_type::allocator_type	allocator_type
Public Member Functions
	multiset ()
	Default constructor creates no elements.
	multiset (const Compare &comp, const allocator_type &a=allocator_type())
template<class InputIterator>
	multiset (InputIterator first, InputIterator last)
	Builds a multiset from a range.
template<class InputIterator>
	multiset (InputIterator first, InputIterator last, const Compare &comp, const allocator_type &a=allocator_type())
	Builds a multiset from a range.
	multiset (const multiset< Key, Compare, Alloc > &x)
	Multiset copy constructor.
multiset< Key, Compare, Alloc > &	operator= (const multiset< Key, Compare, Alloc > &x)
	Multiset assignment operator.
key_compare	key_comp () const
	Returns the comparison object.
value_compare	value_comp () const
	Returns the comparison object.
allocator_type	get_allocator () const
	Returns the memory allocation object.
iterator	begin () const
iterator	end () const
reverse_iterator	rbegin () const
reverse_iterator	rend () const
bool	empty () const
	Returns true if the set is empty.
size_type	size () const
	Returns the size of the set.
size_type	max_size () const
	Returns the maximum size of the set.
void	swap (multiset< Key, Compare, Alloc > &x)
	Swaps data with another multiset.
iterator	insert (const value_type &x)
	Inserts an element into the multiset.
iterator	insert (iterator position, const value_type &x)
	Inserts an element into the multiset.
template<class InputIterator>
void	insert (InputIterator first, InputIterator last)
	A template function that attemps to insert a range of elements.
void	erase (iterator position)
	Erases an element from a multiset.
size_type	erase (const key_type &x)
	Erases elements according to the provided key.
void	erase (iterator first, iterator last)
	Erases a [first,last) range of elements from a multiset.
void	clear ()
size_type	count (const key_type &x) const
	Finds the number of elements with given key.
iterator	find (const key_type &x)
	Tries to locate an element in a set.
const_iterator	find (const key_type &x) const
	Tries to locate an element in a set.
iterator	lower_bound (const key_type &x)
	Finds the beginning of a subsequence matching given key.
const_iterator	lower_bound (const key_type &x) const
	Finds the beginning of a subsequence matching given key.
iterator	upper_bound (const key_type &x)
	Finds the end of a subsequence matching given key.
const_iterator	upper_bound (const key_type &x) const
	Finds the end of a subsequence matching given key.
Private Types
typedef Rb_tree< key_type, value_type, Identity< value_type >, key_compare, Alloc >	Rep_type
Private Attributes
Rep_type	M_t

---

Detailed Description

template<class Key, class Compare, class Alloc>
class std::multiset< Key, Compare, Alloc >

A standard container made up of elements, which can be retrieved in logarithmic time.

Meets the requirements of a container, a reversible container, and an associative container (using equivalent keys). For a multiset<Key> the key_type and value_type are Key.

Multisets support bidirectional iterators.

Definition at line 105 of file stl_multiset.h.

---

Constructor & Destructor Documentation

template<class Key, class Compare, class Alloc>

std::multiset< Key, Compare, Alloc >::multiset

(

)

[inline]

Default constructor creates no elements.

Definition at line 147 of file stl_multiset.h.

template<class Key, class Compare, class Alloc>

template<class InputIterator>

std::multiset< Key, Compare, Alloc >::multiset	(	InputIterator	first,
		InputIterator	last
	)			[inline]

Builds a multiset from a range.

Parameters:

	first	An input iterator.
	last	An input iterator.

Create a multiset consisting of copies of the elements from [first,last). This is linear in N if the range is already sorted, and NlogN otherwise (where N is distance(first,last)).

Definition at line 165 of file stl_multiset.h.

template<class Key, class Compare, class Alloc>

template<class InputIterator>

std::multiset< Key, Compare, Alloc >::multiset	(	InputIterator	first,
		InputIterator	last,
		const Compare &	comp,
		const allocator_type &	a = allocator_type()
	)			[inline]

Builds a multiset from a range.

Parameters:

	first	An input iterator.
	last	An input iterator.
	comp	A comparison functor.
	a	An allocator object.

Create a multiset consisting of copies of the elements from [first,last). This is linear in N if the range is already sorted, and NlogN otherwise (where N is distance(first,last)).

Definition at line 181 of file stl_multiset.h.

template<class Key, class Compare, class Alloc>

std::multiset< Key, Compare, Alloc >::multiset

(

const multiset< Key, Compare, Alloc > &

x

)

[inline]

Multiset copy constructor.

Parameters:

x

A multiset of identical element and allocator types.

The newly-created multiset uses a copy of the allocation object used by x.

Reimplemented in __gnu_debug_def::multiset< Key, Compare, Allocator >.

Definition at line 194 of file stl_multiset.h.

---

Member Function Documentation

template<class Key, class Compare, class Alloc>

multiset<Key,Compare,Alloc>& std::multiset< Key, Compare, Alloc >::operator=

(

const multiset< Key, Compare, Alloc > &

x

)

[inline]

Multiset assignment operator.

Parameters:

x

A multiset of identical element and allocator types.

All the elements of x are copied, but unlike the copy constructor, the allocator object is not copied.

Definition at line 205 of file stl_multiset.h.

template<class Key, class Compare, class Alloc>

key_compare std::multiset< Key, Compare, Alloc >::key_comp

(

)

const [inline]

Returns the comparison object.

Definition at line 215 of file stl_multiset.h.

Referenced by std::multiset< Key, Compare, Allocator >::key_comp().

template<class Key, class Compare, class Alloc>

value_compare std::multiset< Key, Compare, Alloc >::value_comp

(

)

const [inline]

Returns the comparison object.

Definition at line 219 of file stl_multiset.h.

template<class Key, class Compare, class Alloc>

allocator_type std::multiset< Key, Compare, Alloc >::get_allocator

(

)

const [inline]

Returns the memory allocation object.

Definition at line 223 of file stl_multiset.h.

template<class Key, class Compare, class Alloc>

iterator std::multiset< Key, Compare, Alloc >::begin

(

)

const [inline]

Returns a read/write iterator that points to the first element in the multiset. Iteration is done in ascending order according to the keys.

Reimplemented in __gnu_debug_def::multiset< Key, Compare, Allocator >.

Definition at line 232 of file stl_multiset.h.

template<class Key, class Compare, class Alloc>

iterator std::multiset< Key, Compare, Alloc >::end

(

)

const [inline]

Returns a read/write iterator that points one past the last element in the multiset. Iteration is done in ascending order according to the keys.

Reimplemented in __gnu_debug_def::multiset< Key, Compare, Allocator >.

Definition at line 241 of file stl_multiset.h.

template<class Key, class Compare, class Alloc>

reverse_iterator std::multiset< Key, Compare, Alloc >::rbegin

(

)

const [inline]

Returns a read/write reverse iterator that points to the last element in the multiset. Iteration is done in descending order according to the keys.

Reimplemented in __gnu_debug_def::multiset< Key, Compare, Allocator >.

Definition at line 250 of file stl_multiset.h.

template<class Key, class Compare, class Alloc>

reverse_iterator std::multiset< Key, Compare, Alloc >::rend

(

)

const [inline]

Returns a read/write reverse iterator that points to the last element in the multiset. Iteration is done in descending order according to the keys.

Reimplemented in __gnu_debug_def::multiset< Key, Compare, Allocator >.

Definition at line 259 of file stl_multiset.h.

template<class Key, class Compare, class Alloc>

bool std::multiset< Key, Compare, Alloc >::empty

(

)

const [inline]

Returns true if the set is empty.

Definition at line 264 of file stl_multiset.h.

template<class Key, class Compare, class Alloc>

size_type std::multiset< Key, Compare, Alloc >::size

(

)

const [inline]

Returns the size of the set.

Definition at line 269 of file stl_multiset.h.

template<class Key, class Compare, class Alloc>

size_type std::multiset< Key, Compare, Alloc >::max_size

(

)

const [inline]

Returns the maximum size of the set.

Definition at line 274 of file stl_multiset.h.

template<class Key, class Compare, class Alloc>

void std::multiset< Key, Compare, Alloc >::swap

(

multiset< Key, Compare, Alloc > &

x

)

[inline]

Swaps data with another multiset.

Parameters:

x

A multiset of the same element and allocator types.

This exchanges the elements between two multisets in constant time. (It is only swapping a pointer, an integer, and an instance of the Compare type (which itself is often stateless and empty), so it should be quite fast.) Note that the global std::swap() function is specialized such that std::swap(s1,s2) will feed to this function.

Definition at line 289 of file stl_multiset.h.

Referenced by std::swap().

template<class Key, class Compare, class Alloc>

iterator std::multiset< Key, Compare, Alloc >::insert

(

const value_type &

x

)

[inline]

Inserts an element into the multiset.

Parameters:

x

Element to be inserted.

Returns:

An iterator that points to the inserted element.

This function inserts an element into the multiset. Contrary to a std::set the multiset does not rely on unique keys and thus multiple copies of the same element can be inserted.

Insertion requires logarithmic time.

Reimplemented in __gnu_debug_def::multiset< Key, Compare, Allocator >.

Definition at line 305 of file stl_multiset.h.

template<class Key, class Compare, class Alloc>

iterator std::multiset< Key, Compare, Alloc >::insert	(	iterator	position,
		const value_type &	x
	)			[inline]

Inserts an element into the multiset.

Parameters:

	position	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 inserted element.

This function inserts an element into the multiset. Contrary to a std::set the multiset does not rely on unique keys and thus multiple copies of the same element can be inserted.

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.

See http://gcc.gnu.org/onlinedocs/libstdc++/23_containers/howto.html#4 for more on "hinting".

Insertion requires logarithmic time (if the hint is not taken).

Definition at line 329 of file stl_multiset.h.

template<class Key, class Compare, class Alloc>

template<class InputIterator>

void std::multiset< Key, Compare, Alloc >::insert	(	InputIterator	first,
		InputIterator	last
	)			[inline]

A template function that attemps 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.

Reimplemented in __gnu_debug_def::multiset< Key, Compare, Allocator >.

Definition at line 345 of file stl_multiset.h.

template<class Key, class Compare, class Alloc>

void std::multiset< Key, Compare, Alloc >::erase

(

iterator

position

)

[inline]

Erases an element from a multiset.

Parameters:

position

An iterator pointing to the element to be erased.

This function erases an element, pointed to by the given iterator, from a multiset. 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 responsibilty.

Definition at line 359 of file stl_multiset.h.

template<class Key, class Compare, class Alloc>

size_type std::multiset< Key, Compare, 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 elements located by the given key from a multiset. 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 responsibilty.

Reimplemented in __gnu_debug_def::multiset< Key, Compare, Allocator >.

Definition at line 377 of file stl_multiset.h.

template<class Key, class Compare, class Alloc>

void std::multiset< Key, Compare, Alloc >::erase	(	iterator	first,
		iterator	last
	)			[inline]

Erases a [first,last) range of elements from a multiset.

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.

This function erases a sequence of elements from a multiset. 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 responsibilty.

Definition at line 392 of file stl_multiset.h.

template<class Key, class Compare, class Alloc>

void std::multiset< Key, Compare, Alloc >::clear

(

)

[inline]

Erases all elements in a multiset. 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 responsibilty.

Reimplemented in __gnu_debug_def::multiset< Key, Compare, Allocator >.

Definition at line 405 of file stl_multiset.h.

template<class Key, class Compare, class Alloc>

size_type std::multiset< Key, Compare, Alloc >::count

(

const key_type &

x

)

const [inline]

Finds the number of elements with given key.

Parameters:

x

Key of elements to be located.

Returns:

Number of elements with specified key.

Definition at line 416 of file stl_multiset.h.

template<class Key, class Compare, class Alloc>

iterator std::multiset< Key, Compare, Alloc >::find

(

const key_type &

x

)

[inline]

Tries to locate an element in a 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.

Reimplemented in __gnu_debug_def::multiset< Key, Compare, Allocator >.

Definition at line 434 of file stl_multiset.h.

template<class Key, class Compare, class Alloc>

const_iterator std::multiset< Key, Compare, Alloc >::find

(

const key_type &

x

)

const [inline]

Tries to locate an element in a 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.

Reimplemented in __gnu_debug_def::multiset< Key, Compare, Allocator >.

Definition at line 438 of file stl_multiset.h.

template<class Key, class Compare, class Alloc>

iterator std::multiset< Key, Compare, Alloc >::lower_bound

(

const key_type &

x

)

[inline]

Finds the beginning of a subsequence matching given key.

Parameters:

x

Key to be located.

Returns:

Iterator pointing to first element equal to or greater than key, or end().

This function returns the first element of a subsequence of elements that matches the given key. If unsuccessful it returns an iterator pointing to the first element that has a greater value than given key or end() if no such element exists.

Reimplemented in __gnu_debug_def::multiset< Key, Compare, Allocator >.

Definition at line 455 of file stl_multiset.h.

template<class Key, class Compare, class Alloc>

const_iterator std::multiset< Key, Compare, Alloc >::lower_bound

(

const key_type &

x

)

const [inline]

Finds the beginning of a subsequence matching given key.

Parameters:

x

Key to be located.

Returns:

Iterator pointing to first element equal to or greater than key, or end().

This function returns the first element of a subsequence of elements that matches the given key. If unsuccessful it returns an iterator pointing to the first element that has a greater value than given key or end() if no such element exists.

Reimplemented in __gnu_debug_def::multiset< Key, Compare, Allocator >.

Definition at line 459 of file stl_multiset.h.

template<class Key, class Compare, class Alloc>

iterator std::multiset< Key, Compare, Alloc >::upper_bound

(

const key_type &

x

)

[inline]

Finds the end of a subsequence matching given key.

Parameters:

x

Key to be located.

Returns:

Iterator pointing to the first element greater than key, or end().

Reimplemented in __gnu_debug_def::multiset< Key, Compare, Allocator >.

Definition at line 471 of file stl_multiset.h.

template<class Key, class Compare, class Alloc>

const_iterator std::multiset< Key, Compare, Alloc >::upper_bound

(

const key_type &

x

)

const [inline]

Finds the end of a subsequence matching given key.

Parameters:

x

Key to be located.

Returns:

Iterator pointing to the first element greater than key, or end().

Reimplemented in __gnu_debug_def::multiset< Key, Compare, Allocator >.

Definition at line 475 of file stl_multiset.h.

template<class Key, class Compare, class Alloc>

pair<iterator,iterator> std::multiset< Key, Compare, 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 is equivalent to

    std::make_pair(c.lower_bound(val),
                   c.upper_bound(val))

(but is faster than making the calls separately).

This function probably only makes sense for multisets.

Reimplemented in __gnu_debug_def::multiset< Key, Compare, Allocator >.

Definition at line 496 of file stl_multiset.h.

template<class Key, class Compare, class Alloc>

pair<const_iterator,const_iterator> std::multiset< Key, Compare, 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 is equivalent to

    std::make_pair(c.lower_bound(val),
                   c.upper_bound(val))

(but is faster than making the calls separately).

This function probably only makes sense for multisets.

Reimplemented in __gnu_debug_def::multiset< Key, Compare, Allocator >.

Definition at line 500 of file stl_multiset.h.

---

Friends And Related Function Documentation

template<class Key, class Compare, class Alloc>

template<class K1, class C1, class A1>

bool operator==	(	const multiset< K1, C1, A1 > &	,
		const multiset< K1, C1, A1 > &
	)			[friend]

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 is equivalent to

    std::make_pair(c.lower_bound(val),
                   c.upper_bound(val))

(but is faster than making the calls separately).

This function probably only makes sense for multisets.

template<class Key, class Compare, class Alloc>

template<class K1, class C1, class A1>

bool operator<	(	const multiset< K1, C1, A1 > &	,
		const multiset< K1, C1, A1 > &
	)			[friend]

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 is equivalent to

    std::make_pair(c.lower_bound(val),
                   c.upper_bound(val))

(but is faster than making the calls separately).

This function probably only makes sense for multisets.

---

The documentation for this class was generated from the following file:

• stl_multiset.h

---