public member function

std::multimap::clear

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

Parameters

none

Return value

none

Example

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// multimap::clear
#include <iostream>
#include <map>
using namespace std;

int main ()
{
  multimap<char,int> mymultimap;
  multimap<char,int>::iterator it;

  mymultimap.insert(pair<char,int>('b',80));
  mymultimap.insert(pair<char,int>('b',120));
  mymultimap.insert(pair<char,int>('q',360));

  cout << "mymultimap contains:\n";
  for ( it=mymultimap.begin() ; it != mymultimap.end(); it++ )
    cout << (*it).first << " => " << (*it).second << endl;

  mymultimap.clear();

  mymultimap.insert(pair<char,int>('a',11));
  mymultimap.insert(pair<char,int>('x',22));

  cout << "mymultimap contains:\n";
  for ( it=mymultimap.begin() ; it != mymultimap.end(); it++ )
    cout << (*it).first << " => " << (*it).second << endl;

  return 0;
}


Output:
mymultimap contains:
b => 80
b => 120
q => 360
mymap contains:
a => 11
x => 22

Complexity

Linear in size (destructors).

See also

multimap::erase
Erase elements (public member function)
multimap::size
Return container size (public member function)
multimap::empty
Test whether container is empty (public member function)

C++