Syntax:
#include <vector> bool empty() const;
The empty() function returns true if the vector has no elements, false otherwise.
For example, the following code uses empty() as the stopping condition on a while loop to clear a vector and display its contents in reverse order:
vector<int> v; for( int i = 0; i < 5; i++ ) { v.push_back(i); } while( !v.empty() ) { cout << v.back() << endl; v.pop_back(); }