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Difference between revisions of "Template:cpp/container/erase"

From cppreference.com
m (note on erasing an empty range (http://stackoverflow.com/questions/23761273))
(also nothrow guarantee)
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===Return value===
 
===Return value===
 
Iterator following the last removed element.
 
Iterator following the last removed element.
 +
 +
===Exceptions===
 +
Does not throw.
  
 
===Example===
 
===Example===

Revision as of 09:14, 20 May 2014

 
C++
 
Containers library
 
(1)
iterator erase( iterator pos );
 (until C++11)
iterator erase( const_iterator pos );
 (since C++11)
(2)
iterator erase( iterator first, iterator last );
 (until C++11)
iterator erase( const_iterator first, const_iterator last );
 (since C++11)

Removes specified elements from the container.

1) Removes the element at pos.
2) Removes the elements in the range [first; last).
Information on iterator invalidation is copied from here

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.

The iterator first does not need to be dereferenceable if first==last: erasing an empty range is a no-op.

Contents

Parameters

pos - iterator to the element to remove
first, last - range of elements to remove

Return value

Iterator following the last removed element.

Exceptions

Does not throw.

Example

Run this code
#include <{{{1}}}>
#include <iostream>
#include <iterator>
 
int main( )
{
    std::{{{1}}}<int> c{0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
    for (auto &i : c) {
        std::cout << i << " ";
    }
    std::cout << '\n';
 
    c.erase(c.begin());
 
    for (auto &i : c) {
        std::cout << i << " ";
    }
    std::cout << '\n';
 
    std::{{{1}}}<int>::iterator range_begin = c.begin();
    std::{{{1}}}<int>::iterator range_end = c.begin();
    std::advance(range_begin,2);
    std::advance(range_end,5);
 
    c.erase(range_begin, range_end);
 
    for (auto &i : c) {
        std::cout << i << " ";
    }
    std::cout << '\n';
}

Output: 

0 1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9
1 2 6 7 8 9

Complexity

1) Linear in the distance between position and last.
2) Linear in distance between position and the end of the container.

See also

 clears the contents
(public member function of std::{{{1}}}) [edit]
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