/*--------------------------------------------------
created by st10 at Tue Oct 25 13:32:48 PDT 2016
--------------------------------------------------*/
#include <cstdlib>
#include <iostream>
#include <string>
#include <cmath>
using namespace std;


/*--------------------------------------------------
 signature: is_empty : string -> bool
 purpose: expects a string (as a "list of char")
    and returns whether or not it is empty
    (returns true if it contains NO characters)

 examples: is_empty("") == true
           is_empty("m") == false
           is_empty("moo") == false
--------------------------------------------------*/

bool is_empty(string a_string)
{
    return a_string.length() == 0;
}