std::multimap

From cppreference.com
Defined in header <map>
template<

    class Key,
    class T,
    class Compare = std::less<Key>,
    class Allocator = std::allocator<std::pair<const Key, T> >

> class multimap;

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)

std::multimap meets the requirements of Container, AllocatorAwareContainer, AssociativeContainer and ReversibleContainer.

Contents

[edit] Member types

Member type Definition
key_type Key
mapped_type T
value_type std::pair<const Key, T>
size_type Unsigned integral type (usually size_t)
difference_type Signed integer type (usually ptrdiff_t)
key_compare Compare
allocator_type Allocator
reference Allocator::reference (until C++11)
value_type& (since C++11)
const_reference Allocator::const_reference (until C++11)
const value_type& (since C++11)
pointer Allocator::pointer (until C++11)
std::allocator_traits<Allocator>::pointer (since C++11)
const_pointer Allocator::const_pointer (until C++11)
std::allocator_traits<Allocator>::const_pointer (since C++11)
iterator BidirectionalIterator
const_iterator Constant bidirectional iterator
reverse_iterator 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)
destructs the multimap
(public member function)
assigns values to the container
(public member function)
returns the associated allocator
(public member function)
Iterators
returns an iterator to the beginning
(public member function)
returns an iterator to the end
(public member function)
returns a reverse iterator to the beginning
(public member function)
returns a reverse iterator to the end
(public member function)
Capacity
checks whether the container is empty
(public member function)
returns the number of elements
(public member function)
returns the maximum possible number of elements
(public member function)
Modifiers
clears the contents
(public member function)
inserts elements
(public member function)
(C++11)
constructs element in-place
(public member function)
(C++11)
constructs elements in-place using a hint
(public member function)
erases elements
(public member function)
swaps the contents
(public member function)
Lookup
returns the number of elements matching specific key
(public member function)
finds element with specific key
(public member function)
returns range of elements matching a specific key
(public member function)
returns an iterator to the first element not less than the given value
(public member function)
returns an iterator to the first element greater than a certain value
(public member function)
Observers
returns the function that compares keys
(public member function)
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)
specializes the std::swap algorithm
(function template)