std::unordered_map::erase
From cppreference.com
< cpp | container | unordered map
| iterator erase( const_iterator pos );
|
(1) | (since C++11) |
| iterator erase( const_iterator first, const_iterator last );
|
(2) | (since C++11) |
| size_type erase( const key_type& key );
|
(3) | (since C++11) |
Removes specified elements from the container.
1) Removes the element at
pos.
2) Removes the elements in the range
[first; last).
3) Removes all elements with the key value
key
References and iterators to the erased elements are invalidated. Other iterators and references are not invalidated.
Contents |
[edit] Parameters
| pos | - | iterator to the element to remove |
| first, last | - | range of elements to remove |
| key | - | key value of the elements to remove |
[edit] Return value
1-2) Iterator following the last removed element.
3) Number of elements removed.
[edit] Notes
All iterators (pos, first, last) must be valid and dereferenceable, that is, the end() iterator (which is valid, but is not dereferencable) cannot be used.
[edit] Complexity
Given an instance c of unordered_map:
1) Average case: constant, worst case: c.size()
3) Average case: c.count(key), worst case: c.size()
[edit] See also
| clears the contents (public member function) |
|