std::multimap
Defined in header
<map>
|
||
template<
class Key, |
(1) | |
(2) | (since C++17) | |
Multimap is an associative container that contains a sorted list of key-value pairs. Sorting is done according to the comparison function Compare
, applied to the keys. Search, insertion, and removal operations have logarithmic complexity.
The order of the key-value pairs whose keys compare equivalent is the order of insertion and does not change. (since C++11)
Everywhere the standard library uses the Compare
concept, equivalence is determined by using the equivalence relation as described on Compare
. In imprecise terms, two objects a
and b
are considered equivalent if neither compares less than the other: !comp(a, b) && !comp(b, a)
.
std::multimap
meets the requirements of Container
, AllocatorAwareContainer
, AssociativeContainer
and ReversibleContainer
.
Contents |
[edit] Member types
Member type | Definition | ||||
key_type
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Key
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mapped_type
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T
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value_type
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std::pair<const Key, T> | ||||
size_type
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Unsigned integral type (usually std::size_t) | ||||
difference_type
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Signed integer type (usually std::ptrdiff_t) | ||||
key_compare
|
Compare
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||||
allocator_type
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Allocator
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reference
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const_reference
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pointer
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const_pointer
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iterator
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BidirectionalIterator
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const_iterator
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Constant bidirectional iterator | ||||
reverse_iterator
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std::reverse_iterator<iterator> | ||||
const_reverse_iterator
|
std::reverse_iterator<const_iterator> |
[edit] Member classes
compares objects of type value_type (class) |
[edit] Member functions
constructs the multimap (public member function) |
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destructs the multimap (public member function) |
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assigns values to the container (public member function) |
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returns the associated allocator (public member function) |
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Iterators |
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returns an iterator to the beginning (public member function) |
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returns an iterator to the end (public member function) |
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returns a reverse iterator to the beginning (public member function) |
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returns a reverse iterator to the end (public member function) |
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Capacity |
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checks whether the container is empty (public member function) |
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returns the number of elements (public member function) |
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returns the maximum possible number of elements (public member function) |
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Modifiers |
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clears the contents (public member function) |
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inserts elements (public member function) |
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(C++11)
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constructs element in-place (public member function) |
(C++11)
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constructs elements in-place using a hint (public member function) |
erases elements (public member function) |
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swaps the contents (public member function) |
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Lookup |
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returns the number of elements matching specific key (public member function) |
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finds element with specific key (public member function) |
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returns range of elements matching a specific key (public member function) |
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returns an iterator to the first element not less than the given key (public member function) |
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returns an iterator to the first element greater than the given key (public member function) |
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Observers |
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returns the function that compares keys (public member function) |
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returns the function that compares keys in objects of type value_type (public member function) |
[edit] Non-member functions
lexicographically compares the values in the multimap (function template) |
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specializes the std::swap algorithm (function template) |