std::multimap<Key,T,Compare,Allocator>::insert
iterator insert( const value_type& value ); |
(1) | |
iterator insert( value_type&& value ); |
(1) | (since C++17) |
template< class P > iterator insert( P&& value ); |
(2) | (since C++11) |
(3) | ||
iterator insert( iterator hint, const value_type& value ); |
(until C++11) | |
iterator insert( const_iterator hint, const value_type& value ); |
(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) | |
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
. If the container has elements with equivalent key, inserts at the upper bound of that range.
(since C++11) 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
in the position as close as possible, just prior
(since C++11), to
hint
. 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. If a range containing elements with keys equivalent to
nh.key()
exists in the container, the element is inserted at the end of that range. 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 the position just prior to
hint
. The behavior is undefined if
nh
is not empty and
get_allocator() != nh.get_allocator()
.
No iterators or references are invalidated. 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 | - |
|
||||
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
1-2) Logarithmic in the size of the container,
O(log(size()))
.
3-4) Amortized constant if the insertion happens in the position just after the hint, logarithmic in the size of the container otherwise. | (until C++11) |
3-4) Amortized constant if the insertion happens in the position just before the hint, logarithmic in the size of the container otherwise. | (since C++11) |
5-6)
O(N*log(size() + N))
, where N is the number of elements to insert.
7) Logarithmic in the size of the container,
O(log(size()))
.
8) Amortized constant if the insertion happens in the position just
before the hint, logarithmic in the size of the container otherwise.
Example
#include <iostream> #include <string> #include <map> #include <functional> #include <string_view> template<class M> void print(const std::string_view rem, const M& mmap) { std::cout << rem << " "; for (const auto & e : mmap) std::cout << "{" << e.first << "," << e.second << "} "; std::cout << '\n'; } int main() { // list-initialize std::multimap<int, std::string, std::greater<int>> mmap {{2, "foo"}, {2, "bar"}, {3, "baz"}, {1, "abc"}, {5, "def"}}; print("#1", mmap); // insert using value_type mmap.insert(decltype(mmap)::value_type(5, "pqr")); print("#2", mmap); // insert using pair mmap.insert(std::pair{6, "uvw"}); print("#3", mmap); mmap.insert({7, "xyz"}); print("#4", mmap); // insert using initializer_list mmap.insert({{5, "one"}, {5, "two"}}); print("#5", mmap); }
Output:
#1 {5,def} {3,baz} {2,foo} {2,bar} {1,abc} #2 {5,def} {5,pqr} {3,baz} {2,foo} {2,bar} {1,abc} #3 {6,uvw} {5,def} {5,pqr} {3,baz} {2,foo} {2,bar} {1,abc} #4 {7,xyz} {6,uvw} {5,def} {5,pqr} {3,baz} {2,foo} {2,bar} {1,abc} #5 {7,xyz} {6,uvw} {5,def} {5,pqr} {5,one} {5,two} {3,baz} {2,foo} {2,bar} {1,abc}
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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