map::empty
Tests if a map is empty.
bool empty( ) const;
Return Value
true if the map is empty; false if the map is nonempty.
Example
// map_empty.cpp
// compile with: /EHsc
#include <map>
#include <iostream>
int main( )
{
using namespace std;
map <int, int> m1, m2;
typedef pair <int, int> Int_Pair;
m1.insert ( Int_Pair ( 1, 1 ) );
if ( m1.empty( ) )
cout << "The map m1 is empty." << endl;
else
cout << "The map m1 is not empty." << endl;
if ( m2.empty( ) )
cout << "The map m2 is empty." << endl;
else
cout << "The map m2 is not empty." << endl;
}
The map m1 is not empty. The map m2 is empty.
Requirements
Header: <map>
Namespace: std