stl:stack:empty

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empty

Syntax:

    #include <stack>
    bool empty() const;

The empty() function returns true if the stack has no elements, false otherwise.

For example, the following code uses empty() as the stopping condition on a while loop to clear a stack and display its contents in reverse order:

   stack<int> s;
   for( int i = 0; i < 5; i++ ) {
     s.push(i);
   }
   while( !s.empty() ) {
     cout << s.top() << endl;
     s.pop();
   }