std::map< _Key, _Tp, _Compare, _Alloc > Class Template Reference
[Associative Containers]

A standard container made up of (key,value) pairs, which can be retrieved based on a key, in logarithmic time. More...

List of all members.

Public Types

typedef _Alloc allocator_type
typedef _Rep_type::const_iterator const_iterator
typedef
_Pair_alloc_type::const_pointer const_pointer
typedef
_Pair_alloc_type::const_reference const_reference
typedef
_Rep_type::const_reverse_iterator const_reverse_iterator
typedef _Rep_type::difference_type difference_type
typedef _Rep_type::iterator iterator
typedef _Compare key_compare
typedef _Key key_type
typedef _Tp mapped_type
typedef _Pair_alloc_type::pointer pointer
typedef _Pair_alloc_type::reference reference
typedef _Rep_type::reverse_iterator reverse_iterator
typedef _Rep_type::size_type size_type
typedef std::pair< const _Key,
_Tp > value_type

Public Member Functions

const mapped_type & at (const key_type &__k) const
mapped_type & at (const key_type &__k)
const_iterator begin () const
iterator begin ()
const_iterator cbegin () const
const_iterator cend () const
void clear ()
size_type count (const key_type &__x) const
const_reverse_iterator crbegin () const
const_reverse_iterator crend () const
bool empty () const
const_iterator end () const
iterator end ()
std::pair< const_iterator,
const_iterator > equal_range (const key_type &__x) const
std::pair< iterator, iterator > equal_range (const key_type &__x)
void erase (iterator __first, iterator __last)
size_type erase (const key_type &__x)
void erase (iterator __position)
const_iterator find (const key_type &__x) const
iterator find (const key_type &__x)
allocator_type get_allocator () const
template<typename _InputIterator > void insert (_InputIterator __first, _InputIterator __last)
iterator insert (iterator __position, const value_type &__x)
void insert (std::initializer_list< value_type > __list)
std::pair< iterator, bool > insert (const value_type &__x)
key_compare key_comp () const
const_iterator lower_bound (const key_type &__x) const
iterator lower_bound (const key_type &__x)
template<typename _InputIterator > map (_InputIterator __first, _InputIterator __last, const _Compare &__comp, const allocator_type &__a=allocator_type())
template<typename _InputIterator > map (_InputIterator __first, _InputIterator __last)
map (initializer_list< value_type > __l, const _Compare &__c=_Compare(), const allocator_type &__a=allocator_type())
map (map &&__x)
map (const map &__x)
map (const _Compare &__comp, const allocator_type &__a=allocator_type())
map ()
size_type max_size () const
map & operator= (initializer_list< value_type > __l)
map & operator= (map &&__x)
map & operator= (const map &__x)
mapped_type & operator[] (const key_type &__k)
const_reverse_iterator rbegin () const
reverse_iterator rbegin ()
const_reverse_iterator rend () const
reverse_iterator rend ()
size_type size () const
void swap (map &&__x)
const_iterator upper_bound (const key_type &__x) const
iterator upper_bound (const key_type &__x)
value_compare value_comp () const

Friends

template<typename _K1 , typename _T1 , typename _C1 , typename _A1 > bool operator< (const map< _K1, _T1, _C1, _A1 > &, const map< _K1, _T1, _C1, _A1 > &)
template<typename _K1 , typename _T1 , typename _C1 , typename _A1 > bool operator== (const map< _K1, _T1, _C1, _A1 > &, const map< _K1, _T1, _C1, _A1 > &)

Detailed Description

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>
class std::map< _Key, _Tp, _Compare, _Alloc >

A standard container made up of (key,value) pairs, which can be retrieved based on a key, in logarithmic time.

Meets the requirements of a container, a reversible container, and an associative container (using unique keys). For a map<Key,T> the key_type is Key, the mapped_type is T, and the value_type is std::pair<const Key,T>.

Maps support bidirectional iterators.

The private tree data is declared exactly the same way for map and multimap; the distinction is made entirely in how the tree functions are called (*_unique versus *_equal, same as the standard).

Definition at line 86 of file stl_map.h.

Constructor & Destructor Documentation

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

std::map< _Key, _Tp, _Compare, _Alloc >::map ( ) [inline]

Default constructor creates no elements.

Definition at line 150 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

std::map< _Key, _Tp, _Compare, _Alloc >::map	(	const _Compare &	__comp,
		const allocator_type &	__a = `allocator_type()`
	)			`[inline, explicit]`

Creates a map with no elements.

Parameters:

	comp	A comparison object.
	a	An allocator object.

Definition at line 159 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

std::map< _Key, _Tp, _Compare, _Alloc >::map ( const map< _Key, _Tp, _Compare, _Alloc > & __x ) [inline]

Map copy constructor.

Parameters:

x

A map of identical element and allocator types.

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

Definition at line 170 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

std::map< _Key, _Tp, _Compare, _Alloc >::map ( map< _Key, _Tp, _Compare, _Alloc > && __x ) [inline]

Map move constructor.

Parameters:

x

A map of identical element and allocator types.

The newly-created map contains the exact contents of x. The contents of x are a valid, but unspecified map.

Definition at line 181 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

std::map< _Key, _Tp, _Compare, _Alloc >::map	(	initializer_list< value_type >	__l,
		const _Compare &	__c = `_Compare()`,
		const allocator_type &	__a = `allocator_type()`
	)			`[inline]`

Builds a map from an initializer_list.

Parameters:

	l	An initializer_list.
	comp	A comparison object.
	a	An allocator object.

Create a map consisting of copies of the elements in the initializer_list l. This is linear in N if the range is already sorted, and NlogN otherwise (where N is l.size()).

Definition at line 195 of file stl_map.h.

References std::initializer_list< _E >::begin(), and std::initializer_list< _E >::end().

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

template<typename _InputIterator >

std::map< _Key, _Tp, _Compare, _Alloc >::map	(	_InputIterator	__first,
		_InputIterator	__last
	)			`[inline]`

Builds a map from a range.

Parameters:

	first	An input iterator.
	last	An input iterator.

Create a map 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 212 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

template<typename _InputIterator >

std::map< _Key, _Tp, _Compare, _Alloc >::map	(	_InputIterator	__first,
		_InputIterator	__last,
		const _Compare &	__comp,
		const allocator_type &	__a = `allocator_type()`
	)			`[inline]`

Builds a map from a range.

Parameters:

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

Create a map 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 228 of file stl_map.h.

Member Function Documentation

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

mapped_type& std::map< _Key, _Tp, _Compare, _Alloc >::at ( const key_type & __k ) [inline]

Access to map data.

Parameters:

k

The key for which data should be retrieved.

Returns:: A reference to the data whose key is equivalent to k, if such a data is present in the map.

Exceptions:

std::out_of_range

If no such data is present.

Definition at line 464 of file stl_map.h.

References std::lower_bound().

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

const_iterator std::map< _Key, _Tp, _Compare, _Alloc >::begin ( ) const [inline]

Returns a read-only (constant) iterator that points to the first pair in the map. Iteration is done in ascending order according to the keys.

Definition at line 315 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

iterator std::map< _Key, _Tp, _Compare, _Alloc >::begin ( ) [inline]

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

Definition at line 306 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

const_iterator std::map< _Key, _Tp, _Compare, _Alloc >::cbegin ( ) const [inline]

Returns a read-only (constant) iterator that points to the first pair in the map. Iteration is done in ascending order according to the keys.

Definition at line 379 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

const_iterator std::map< _Key, _Tp, _Compare, _Alloc >::cend ( ) const [inline]

Returns a read-only (constant) iterator that points one past the last pair in the map. Iteration is done in ascending order according to the keys.

Definition at line 388 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

void std::map< _Key, _Tp, _Compare, _Alloc >::clear ( ) [inline]

Erases all elements in a map. 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 625 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

size_type std::map< _Key, _Tp, _Compare, _Alloc >::count ( const key_type & __x ) const [inline]

Finds the number of elements with given key.

Parameters:

x

Key of (key, value) pairs to be located.

Returns:: Number of elements with specified key.

This function only makes sense for multimaps; for map the result will either be 0 (not present) or 1 (present).

Definition at line 685 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

const_reverse_iterator std::map< _Key, _Tp, _Compare, _Alloc >::crbegin ( ) const [inline]

Returns a read-only (constant) reverse iterator that points to the last pair in the map. Iteration is done in descending order according to the keys.

Definition at line 397 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

const_reverse_iterator std::map< _Key, _Tp, _Compare, _Alloc >::crend ( ) const [inline]

Returns a read-only (constant) reverse iterator that points to one before the first pair in the map. Iteration is done in descending order according to the keys.

Definition at line 406 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

bool std::map< _Key, _Tp, _Compare, _Alloc >::empty ( ) const [inline]

Returns true if the map is empty. (Thus begin() would equal end().)

Definition at line 415 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

const_iterator std::map< _Key, _Tp, _Compare, _Alloc >::end ( ) const [inline]

Returns a read-only (constant) iterator that points one past the last pair in the map. Iteration is done in ascending order according to the keys.

Definition at line 333 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

iterator std::map< _Key, _Tp, _Compare, _Alloc >::end ( ) [inline]

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

Definition at line 324 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

std::pair<const_iterator, const_iterator> std::map< _Key, _Tp, _Compare, _Alloc >::equal_range ( const key_type & __x ) const [inline]

Finds a subsequence matching given key.

Parameters:

x

Key of (key, value) pairs to be located.

Returns:: Pair of read-only (constant) 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 multimaps.

Definition at line 773 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

std::pair<iterator, iterator> std::map< _Key, _Tp, _Compare, _Alloc >::equal_range ( const key_type & __x ) [inline]

Finds a subsequence matching given key.

Parameters:

x

Key of (key, value) pairs 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 multimaps.

Definition at line 754 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

void std::map< _Key, _Tp, _Compare, _Alloc >::erase	(	iterator	__first,
		iterator	__last
	)			`[inline]`

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

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 map. 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 596 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

size_type std::map< _Key, _Tp, _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 the elements located by the given key from a map. 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 581 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

void std::map< _Key, _Tp, _Compare, _Alloc >::erase ( iterator __position ) [inline]

Erases an element from a map.

Parameters:

position

An iterator pointing to the element to be erased.

This function erases an element, pointed to by the given iterator, from a map. 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 566 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

const_iterator std::map< _Key, _Tp, _Compare, _Alloc >::find ( const key_type & __x ) const [inline]

Tries to locate an element in a map.

Parameters:

x

Key of (key, value) pair to be located.

Returns:: Read-only (constant) 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 a constant iterator pointing to the sought after pair. If unsuccessful it returns the past-the-end ( end() ) iterator.

Definition at line 673 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

iterator std::map< _Key, _Tp, _Compare, _Alloc >::find ( const key_type & __x ) [inline]

Tries to locate an element in a map.

Parameters:

x

Key of (key, value) pair 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 pair. If unsuccessful it returns the past-the-end ( end() ) iterator.

Definition at line 658 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

allocator_type std::map< _Key, _Tp, _Compare, _Alloc >::get_allocator ( ) const [inline]

Get a copy of the memory allocation object.

Definition at line 296 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

template<typename _InputIterator >

void std::map< _Key, _Tp, _Compare, _Alloc >::insert	(	_InputIterator	__first,
		_InputIterator	__last
	)			`[inline]`

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 552 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

iterator std::map< _Key, _Tp, _Compare, _Alloc >::insert	(	iterator	__position,
		const value_type &	__x
	)			`[inline]`

Attempts to insert a std::pair into the map.

Parameters:

	position	An iterator that serves as a hint as to where the pair should be inserted.
	x	Pair to be inserted (see std::make_pair for easy creation of pairs).

Returns:: An iterator that points to the element with key of x (may or may not be the pair 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.

See http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt07ch17.html for more on "hinting".

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

Definition at line 539 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

void std::map< _Key, _Tp, _Compare, _Alloc >::insert ( std::initializer_list< value_type > __list ) [inline]

Attempts to insert a list of std::pairs into the map.

Parameters:

list

A std::initializer_list<value_type> of pairs to be inserted.

Complexity similar to that of the range constructor.

Definition at line 511 of file stl_map.h.

References std::initializer_list< _E >::begin(), std::initializer_list< _E >::end(), and std::map< _Key, _Tp, _Compare, _Alloc >::insert().

Referenced by std::map< _Key, _Tp, _Compare, _Alloc >::insert().

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

std::pair<iterator, bool> std::map< _Key, _Tp, _Compare, _Alloc >::insert ( const value_type & __x ) [inline]

Attempts to insert a std::pair into the map.

Parameters:

x

Pair to be inserted (see std::make_pair for easy creation of pairs).

Returns:: A pair, of which the first element is an iterator that points to the possibly inserted pair, and the second is a bool that is true if the pair was actually inserted.

This function attempts to insert a (key, value) pair into the map. A map relies on unique keys and thus a pair is only inserted if its first element (the key) is not already present in the map.

Insertion requires logarithmic time.

Definition at line 499 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

key_compare std::map< _Key, _Tp, _Compare, _Alloc >::key_comp ( ) const [inline]

Returns the key comparison object out of which the map was constructed.

Definition at line 634 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

const_iterator std::map< _Key, _Tp, _Compare, _Alloc >::lower_bound ( const key_type & __x ) const [inline]

Finds the beginning of a subsequence matching given key.

Parameters:

x

Key of (key, value) pair to be located.

Returns:: Read-only (constant) 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.

Definition at line 715 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

iterator std::map< _Key, _Tp, _Compare, _Alloc >::lower_bound ( const key_type & __x ) [inline]

Finds the beginning of a subsequence matching given key.

Parameters:

x

Key of (key, value) pair 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.

Definition at line 700 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

size_type std::map< _Key, _Tp, _Compare, _Alloc >::max_size ( ) const [inline]

Returns the maximum size of the map.

Definition at line 425 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

map& std::map< _Key, _Tp, _Compare, _Alloc >::operator= ( initializer_list< value_type > __l ) [inline]

Map list assignment operator.

Parameters:

l

An initializer_list.

This function fills a map with copies of the elements in the initializer list l.

Note that the assignment completely changes the map and that the resulting map's size is the same as the number of elements assigned. Old data may be lost.

Definition at line 286 of file stl_map.h.

References std::initializer_list< _E >::begin(), and std::initializer_list< _E >::end().

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

map& std::map< _Key, _Tp, _Compare, _Alloc >::operator= ( map< _Key, _Tp, _Compare, _Alloc > && __x ) [inline]

Map move assignment operator.

Parameters:

x

A map of identical element and allocator types.

The contents of x are moved into this map (without copying). x is a valid, but unspecified map.

Definition at line 266 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

map& std::map< _Key, _Tp, _Compare, _Alloc >::operator= ( const map< _Key, _Tp, _Compare, _Alloc > & __x ) [inline]

Map assignment operator.

The dtor only erases the elements, and note 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.

Parameters:

x

A map 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 251 of file stl_map.h.

References std::map< _Key, _Tp, _Compare, _Alloc >::_M_t.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

mapped_type& std::map< _Key, _Tp, _Compare, _Alloc >::operator[] ( const key_type & __k ) [inline]

Subscript ( [] ) access to map data.

Parameters:

k

The key for which data should be retrieved.

Returns:: A reference to the data of the (key,data) pair.

Allows for easy lookup with the subscript ( [] ) operator. Returns data associated with the key specified in subscript. If the key does not exist, a pair with that key is created using default values, which is then returned.

Lookup requires logarithmic time.

Definition at line 442 of file stl_map.h.

References std::lower_bound().

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

const_reverse_iterator std::map< _Key, _Tp, _Compare, _Alloc >::rbegin ( ) const [inline]

Returns a read-only (constant) reverse iterator that points to the last pair in the map. Iteration is done in descending order according to the keys.

Definition at line 351 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

reverse_iterator std::map< _Key, _Tp, _Compare, _Alloc >::rbegin ( ) [inline]

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

Definition at line 342 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

const_reverse_iterator std::map< _Key, _Tp, _Compare, _Alloc >::rend ( ) const [inline]

Returns a read-only (constant) reverse iterator that points to one before the first pair in the map. Iteration is done in descending order according to the keys.

Definition at line 369 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

reverse_iterator std::map< _Key, _Tp, _Compare, _Alloc >::rend ( ) [inline]

Returns a read/write reverse iterator that points to one before the first pair in the map. Iteration is done in descending order according to the keys.

Definition at line 360 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

size_type std::map< _Key, _Tp, _Compare, _Alloc >::size ( ) const [inline]

Returns the size of the map.

Definition at line 420 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

void std::map< _Key, _Tp, _Compare, _Alloc >::swap ( map< _Key, _Tp, _Compare, _Alloc > && __x ) [inline]

Swaps data with another map.

Parameters:

x

A map of the same element and allocator types.

This exchanges the elements between two maps 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(m1,m2) will feed to this function.

Definition at line 612 of file stl_map.h.

References std::map< _Key, _Tp, _Compare, _Alloc >::_M_t.

Referenced by std::swap().

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

const_iterator std::map< _Key, _Tp, _Compare, _Alloc >::upper_bound ( const key_type & __x ) const [inline]

Finds the end of a subsequence matching given key.

Parameters:

x

Key of (key, value) pair to be located.

Returns:: Read-only (constant) iterator pointing to first iterator greater than key, or end().

Definition at line 735 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

iterator std::map< _Key, _Tp, _Compare, _Alloc >::upper_bound ( const key_type & __x ) [inline]

Finds the end of a subsequence matching given key.

Parameters:

x

Key of (key, value) pair to be located.

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

Definition at line 725 of file stl_map.h.

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>

value_compare std::map< _Key, _Tp, _Compare, _Alloc >::value_comp ( ) const [inline]

Returns a value comparison object, built from the key comparison object out of which the map was constructed.

Definition at line 642 of file stl_map.h.

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

stl_map.h

std::map< _Key, _Tp, _Compare, _Alloc > Class Template Reference [Associative Containers]

Public Types

Public Member Functions

Friends

Detailed Description

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >> class std::map< _Key, _Tp, _Compare, _Alloc >

Constructor & Destructor Documentation

Member Function Documentation

std::map< _Key, _Tp, _Compare, _Alloc > Class Template Reference
[Associative Containers]

template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>, typename _Alloc = std::allocator<std::pair<const _Key, _Tp> >>
class std::map< _Key, _Tp, _Compare, _Alloc >