erase

  #include <vector>
  iterator erase( iterator loc );
  iterator erase( iterator start, iterator end );

The erase() function either deletes the element at location loc, or deletes the elements between start and end (including start but not including end). The return value is the element after the last element erased.

The first version of erase (the version that deletes a single element at location loc) runs in constant time for lists and linear time for vectors, dequeues, and strings. The multiple-element version of erase always takes linear time.

For example:

  // Create a vector, load it with the first ten characters of the alphabet
  vector<char> alphaVector;
  for( int i=0; i < 10; i++ ) {
    alphaVector.push_back( i + 65 );
  }
  int size = alphaVector.size();
  vector<char>::iterator startIterator;
  vector<char>::iterator tempIterator;
  for( int i=0; i < size; i++ ) {
    startIterator = alphaVector.begin();
    alphaVector.erase( startIterator );
    // Display the vector
    for( tempIterator = alphaVector.begin(); tempIterator != alphaVector.end(); tempIterator++ ) {
      cout << *tempIterator;
    }
    cout << endl;
  }              

That code would display the following output:

  BCDEFGHIJ
  CDEFGHIJ
  DEFGHIJ
  EFGHIJ
  FGHIJ
  GHIJ
  HIJ
  IJ
  J              

In the next example, erase() is called with two iterators to delete a range of elements from a vector:

  // create a vector, load it with the first ten characters of the alphabet
  vector<char> alphaVector;
  for( int i=0; i < 10; i++ ) {
    alphaVector.push_back( i + 65 );
  }
  // display the complete vector
  for( int i = 0; i < alphaVector.size(); i++ ) {
    cout << alphaVector[i];
  }
  cout << endl;            

  // use erase to remove all but the first two and last three elements
  // of the vector
  alphaVector.erase( alphaVector.begin()+2, alphaVector.end()-3 );
  // display the modified vector
  for( int i = 0; i < alphaVector.size(); i++ ) {
    cout << alphaVector[i];
  }
  cout << endl;            

When run, the above code displays:

  ABCDEFGHIJ
  ABHIJ