| map::clear |
public member function |
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
// map::clear
#include <iostream>
#include <map>
using namespace std;
int main ()
{
map<char,int> mymap;
map<char,int>::iterator it;
mymap['x']=100;
mymap['y']=200;
mymap['z']=300;
cout << "mymap contains:\n";
for ( it=mymap.begin() ; it != mymap.end(); it++ )
cout << (*it).first << " => " << (*it).second << endl;
mymap.clear();
mymap['a']=1101;
mymap['b']=2202;
cout << "mymap contains:\n";
for ( it=mymap.begin() ; it != mymap.end(); it++ )
cout << (*it).first << " => " << (*it).second << endl;
return 0;
}
|
Output:
mymap contains:
x => 100
y => 200
z => 300
mymap contains:
a => 1101
b => 2202
|
Complexity
Linear in size (destructors).
See also
| map::erase | Erase elements (public member function) |
| map::size | Return container size (public member function) |
| map::empty | Test whether container is empty (public member function) |
