std::unordered_multimap<Key,T,Hash,KeyEqual,Allocator>::insert
Defined in header <unordered_map> |
||
---|---|---|
iterator insert( const value_type& value ); |
(1) | (since C++11) |
iterator insert( value_type&& value ); |
(1) | (since C++17) |
template< class P > iterator insert( P&& value ); |
(2) | (since C++11) |
iterator insert( const_iterator hint, const value_type& value ); |
(3) | (since C++11) |
iterator insert( const_iterator hint, value_type&& value ); |
(3) | (since C++17) |
template< class P > iterator insert( const_iterator hint, P&& value ); |
(4) | (since C++11) |
template< class InputIt > void insert( InputIt first, InputIt last ); |
(5) | (since C++11) |
void insert( std::initializer_list<value_type> ilist ); |
(6) | (since C++11) |
iterator insert( node_type&& nh ); |
(7) | (since C++17) |
iterator insert( const_iterator hint, node_type&& nh ); |
(8) | (since C++17) |
Inserts element(s) into the container.
1-2) inserts
value
. The overload
(2) is equivalent to
emplace(std::forward<P>(value))
and only participates in overload resolution if
std::is_constructible<value_type, P&&>::value == true
.
3-4) inserts
value
, using
hint
as a non-binding suggestion to where the search should start. The overload
(4) is equivalent to
emplace_hint(hint, std::forward<P>(value))
and only participates in overload resolution if
std::is_constructible<value_type, P&&>::value == true
.
5) inserts elements from range
[first, last)
.
6) inserts elements from initializer list
ilist
.
7) If
nh
is an empty
node handle, does nothing. Otherwise, inserts the element owned by
nh
into the container and returns an iterator pointing at the inserted element.. The behavior is undefined if
nh
is not empty and
get_allocator() != nh.get_allocator()
.
8) If
nh
is an empty
node handle, does nothing and returns the end iterator. Otherwise, inserts the element owned by
nh
into the container, and returns the iterator pointing to the element with key equivalent to
nh.key()
The element is inserted as close as possible to
hint
. The behavior is undefined if
nh
is not empty and
get_allocator() != nh.get_allocator()
.
If rehashing occurs due to the insertion, all iterators are invalidated. Otherwise iterators are not affected. References are not invalidated. Rehashing occurs only if the new number of elements is greater than max_load_factor()*bucket_count()
. If the insertion is successful, pointers and references to the element obtained while it is held in the node handle are invalidated, and pointers and references obtained to that element before it was extracted become valid. (since C++17).
Parameters
hint | - | iterator, used as a suggestion as to where to insert the content |
value | - | element value to insert |
first, last | - | range of elements to insert |
ilist | - | initializer list to insert the values from |
nh | - | a compatible node handle |
Type requirements | ||
-InputIt must meet the requirements of LegacyInputIterator. |
Return value
1-4) Returns an iterator to the inserted element.
5-6) (none)
7,8) End iterator if
nh
was empty, iterator pointing to the inserted element otherwise.
Exceptions
1-4) If an exception is thrown by any operation, the insertion has no effect.
Complexity
1-4) Average case:
O(1)
, worst case
O(size())
5-6) Average case:
O(N)
, where N is the number of elements to insert. Worse case:
O(N*size()+N)
7-8) Average case:
O(1)
, worst case
O(size())
See also
(C++11)
|
constructs element in-place (public member function) |
(C++11)
|
constructs elements in-place using a hint (public member function) |
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