public member function

std::list::clear

<list>
void clear ( );
Clear content
All the elements in the list container are dropped: their destructors are called, and then they are removed from the list container, leaving it with a size of 0.

Parameters

none

Return value

none

Example

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// clearing lists
#include <iostream>
#include <list>
using namespace std;

int main ()
{
  list<int> mylist;
  list<int>::iterator it;

  mylist.push_back (100);
  mylist.push_back (200);
  mylist.push_back (300);

  cout << "mylist contains:";
  for (it=mylist.begin(); it!=mylist.end(); ++it)
    cout << " " << *it;

  mylist.clear();
  mylist.push_back (1101);
  mylist.push_back (2202);

  cout << "\nmylist contains:";
  for (it=mylist.begin(); it!=mylist.end(); ++it)
    cout << " " << *it;

  cout << endl;

  return 0;
}


Output:
mylist contains: 100 200 300
mylist contains: 1101 2202

Complexity

Linear on size (destructors).

See also

list::erase
Erase elements (public member function)
list::resize
Change size (public member function)
list::pop_back
Delete last element (public member function)
list::pop_front
Delete first element (public member function)
list::remove
Remove elements with specific value (public member function)
list::unique
Remove duplicate values (public member function)
list::empty
Test whether container is empty (public member function)

C++