Namespaces
Variants
Views
Actions

std::map::erase

From cppreference.com
< cpp‎ | container‎ | map
Revision as of 19:32, 31 May 2013 by P12bot (Talk | contribs)

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
(1)
void erase( iterator pos );
(until C++11)
iterator erase( const_iterator pos );
(since C++11)
(2)
void erase( iterator first, iterator last );
(until C++11)
iterator erase( const_iterator first, const_iterator last );
(since C++11)
size_type erase( const key_type& key );
(3)

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 references and iterators are not affected.

The iterator pos must be valid and dereferenceable. Thus the end() iterator (which is valid, but is not dereferencable) cannot be used as a value for pos.


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] Exceptions

1,2) (none)
3) Any exceptions thrown by the Compare object.

[edit] Complexity

Given an instance c of map:

1) Amortized constant
2) log(c.size()) + std::distance(first, last)
3) log(c.size()) + c.count(k)

[edit] See also

clears the contents
(public member function) [edit]