set::empty
Tests if a set is empty.
bool empty( ) const;
Return Value
true if the set is empty; false if the set is nonempty.
Example
// set_empty.cpp
// compile with: /EHsc
#include <set>
#include <iostream>
int main( )
{
using namespace std;
set <int> s1, s2;
s1.insert ( 1 );
if ( s1.empty( ) )
cout << "The set s1 is empty." << endl;
else
cout << "The set s1 is not empty." << endl;
if ( s2.empty( ) )
cout << "The set s2 is empty." << endl;
else
cout << "The set s2 is not empty." << endl;
}
The set s1 is not empty. The set s2 is empty.
Requirements
Header: <set>
Namespace: std