std::map< _Key, _Tp, _Compare, _Alloc >(3) Library Functions Manual std::map< _Key, _Tp, _Compare, _Alloc >(3)
NAME
std::map< _Key, _Tp, _Compare, _Alloc > -
SYNOPSIS
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
map ()
map (const _Compare &__comp, const allocator_type &__a=allocator_type())
map (const map &__x)
map (initializer_list< value_type > __l, const _Compare &__comp=_Compare(), const allocator_type &__a=allocator_type())
template<typename _InputIterator > map (_InputIterator __first, _InputIterator __last)
template<typename _InputIterator > map (_InputIterator __first, _InputIterator __last, const _Compare &__comp, const allocator_type
&__a=allocator_type())
mapped_type & at (const key_type &__k)
const mapped_type & at (const key_type &__k) const
iterator begin () noexcept
const_iterator begin () const noexcept
const_iterator cbegin () const noexcept
const_iterator cend () const noexcept
void clear () noexcept
size_type count (const key_type &__x) const
const_reverse_iterator crbegin () const noexcept
const_reverse_iterator crend () const noexcept
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
iterator end () noexcept
const_iterator end () const noexcept
std::pair< iterator, iterator > equal_range (const key_type &__x)
std::pair< const_iterator,
const_iterator > equal_range (const key_type &__x) const "
iterator erase (const_iterator __position)
_GLIBCXX_ABI_TAG_CXX11 iterator erase (iterator __position)
size_type erase (const key_type &__x)
iterator erase (const_iterator __first, const_iterator __last)
iterator find (const key_type &__x)
const_iterator find (const key_type &__x) const
allocator_type get_allocator () const noexcept
std::pair< iterator, bool > insert (const value_type &__x)
template<typename _Pair , typename = typename std::enable_if<std::is_constructible<value_type,
_Pair&&>::value>::type> std::pair< iterator, bool > insert (_Pair &&__x)
void insert (std::initializer_list< value_type > __list)
template<typename _Pair , typename = typename std::enable_if<std::is_constructible<value_type,
_Pair&&>::value>::type> iterator insert (const_iterator __position, _Pair &&__x)
template<typename _InputIterator > void insert (_InputIterator __first, _InputIterator __last)
key_compare key_comp () const
iterator lower_bound (const key_type &__x)
const_iterator lower_bound (const key_type &__x) const
size_type max_size () const noexcept
noexcept (is_nothrow_copy_constructible< _Compare >::value)
map & operator= (const map &__x)
map & operator= (map &&__x)
map & operator= (initializer_list< value_type > __l)
mapped_type & operator[] (const key_type &__k)
mapped_type & operator[] (key_type &&__k)
reverse_iterator rbegin () noexcept
const_reverse_iterator rbegin () const noexcept
reverse_iterator rend () noexcept
const_reverse_iterator rend () const noexcept
size_type size () const noexcept
void swap (map &__x)
iterator upper_bound (const key_type &__x)
const_iterator upper_bound (const key_type &__x) const
value_compare value_comp () const
Public Attributes
iterator
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.
Template Parameters:
_Key Type of key objects.
_Tp Type of mapped objects.
_Compare Comparison function object type, defaults to less<_Key>.
_Alloc Allocator type, defaults to allocator<pair<const _Key, _Tp>.
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 96 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 160 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 169 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 180 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 &__comp = _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 206 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) [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 224 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 241 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 501 of file stl_map.h.
References std::map< _Key, _Tp, _Compare, _Alloc >::end(), std::map< _Key, _Tp, _Compare, _Alloc >::key_comp(), and std::map< _Key, _Tp,
_Compare, _Alloc >::lower_bound().
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], [noexcept]
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 320 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 >::begin () const [inline], [noexcept]
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 329 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], [noexcept]
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 393 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], [noexcept]
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 402 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], [noexcept]
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 788 of file stl_map.h.
Referenced by std::map< _Key, _Tp, _Compare, _Alloc >::operator=().
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 848 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], [noexcept]
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 411 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], [noexcept]
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 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> >>
template<typename... _Args> std::pair<iterator, bool> std::map< _Key, _Tp, _Compare, _Alloc >::emplace (_Args &&...__args) [inline]
Attempts to build and insert a std::pair into the map.
Parameters:
__args Arguments used to generate a new pair instance (see std::piecewise_contruct for passing arguments to each part of the pair
constructor).
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 build and 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 540 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... _Args> iterator std::map< _Key, _Tp, _Compare, _Alloc >::emplace_hint (const_iterator__pos, _Args &&...__args)
[inline]
Attempts to build and insert a std::pair into the map.
Parameters:
__pos An iterator that serves as a hint as to where the pair should be inserted.
__args Arguments used to generate a new pair instance (see std::piecewise_contruct for passing arguments to each part of the pair
constructor).
Returns:
An iterator that points to the element with key of the std::pair built from __args (may or may not be that std::pair).
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.
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 570 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], [noexcept]
Returns true if the map is empty. (Thus begin() would equal end().)
Definition at line 429 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], [noexcept]
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 338 of file stl_map.h.
Referenced by std::map< _Key, _Tp, _Compare, _Alloc >::at(), and std::map< _Key, _Tp, _Compare, _Alloc >::operator[]().
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], [noexcept]
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 347 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 917 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 936 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 >::erase (const_iterator__position) [inline]
Erases an element from a map.
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 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 690 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 726 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 >::erase (const_iterator__first, const_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.
Returns:
The iterator __last.
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 746 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 821 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 836 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], [noexcept]
Get a copy of the memory allocation object.
Definition at line 310 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, 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 594 of file stl_map.h.
Referenced by std::map< _Key, _Tp, _Compare, _Alloc >::insert(), std::map< _Key, _Tp, _Compare, _Alloc >::operator=(), and std::map< _Key,
_Tp, _Compare, _Alloc >::operator[]().
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 615 of file stl_map.h.
References 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> >>
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 670 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 797 of file stl_map.h.
Referenced by std::map< _Key, _Tp, _Compare, _Alloc >::at(), and std::map< _Key, _Tp, _Compare, _Alloc >::operator[]().
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 863 of file stl_map.h.
Referenced by std::map< _Key, _Tp, _Compare, _Alloc >::at(), and std::map< _Key, _Tp, _Compare, _Alloc >::operator[]().
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 878 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], [noexcept]
Returns the maximum size of the map.
Definition at line 439 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 >::noexcept (is_nothrow_copy_constructible< _Compare >::value) [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 192 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 264 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= (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 279 of file stl_map.h.
References std::map< _Key, _Tp, _Compare, _Alloc >::clear(), and std::map< _Key, _Tp, _Compare, _Alloc >::swap().
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 300 of file stl_map.h.
References std::map< _Key, _Tp, _Compare, _Alloc >::clear(), and 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> >>
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 456 of file stl_map.h.
References std::map< _Key, _Tp, _Compare, _Alloc >::end(), std::map< _Key, _Tp, _Compare, _Alloc >::insert(), std::map< _Key, _Tp,
_Compare, _Alloc >::key_comp(), std::map< _Key, _Tp, _Compare, _Alloc >::lower_bound(), and std::piecewise_construct.
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], [noexcept]
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 356 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 >::rbegin () const [inline], [noexcept]
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 365 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], [noexcept]
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 374 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], [noexcept]
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 383 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], [noexcept]
Returns the size of the map.
Definition at line 434 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 778 of file stl_map.h.
Referenced by std::map< _Key, _Tp, _Compare, _Alloc >::operator=(), and std::swap().
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 888 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 >::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 898 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 805 of file stl_map.h.
Member Data 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 >::iterator
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 648 of file stl_map.h.
Author
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