map::empty
public member function
Test whether container is empty
Returns whether the map container is empty, i.e. whether its size is 0.
This function does not modify the content of the container in any way. To clear its content, use member clear.
Parameters
none
Return Value
true if the container size is 0, false otherwise.
Example
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// map::empty
#include <iostream>
#include <map>
using namespace std;
int main ()
{
map<char,int> mymap;
mymap['a']=10;
mymap['b']=20;
mymap['c']=30;
while (!mymap.empty())
{
cout << mymap.begin()->first << " => ";
cout << mymap.begin()->second << endl;
mymap.erase(mymap.begin());
}
return 0;
}
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Output:
Complexity
Constant.
See also
| map::erase | Erase elements (public member function) |
| map::size | Return container size (public member function) |
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