access list

[aruljothi]

#include <set>
#include <string>
#include <list>
#include <iostream>
#include <iterator>
using namespace std;

using std::set;
using std::string;
using std::list;

class AccessList
{
public:
  AccessList() {}

  void addUser(const string& user);

  void removeUser(const string& user);

  bool isAllowed(const string& user) const;

  list<string> getAllUsers() const;

protected:
  set<string> mAllowed;
};

void AccessList::addUser(const string& user)
{
  mAllowed.insert(user);
}

void AccessList::removeUser(const string& user)
{
  mAllowed.erase(user);
}

bool AccessList::isAllowed(const string& user) const
{
  return (mAllowed.count(user) == 1);
}

list<string> AccessList::getAllUsers() const
{
  list<string> users;
  users.insert(users.end(), mAllowed.begin(), mAllowed.end());
  return (users);
}

int main(int argc, char** argv)
{
  AccessList fileX;

  fileX.addUser("A");
  fileX.addUser("B");
  fileX.addUser("C");
  fileX.removeUser("D");

  if (fileX.isAllowed("A")) {
    cout << "nsolter has permissions\n";
  }

  if (fileX.isAllowed("B")) {
    cout << "baduser has permissions\n";
  }

  list<string> users = fileX.getAllUsers();
  for (list<string>::const_iterator it = users.begin();
       it != users.end(); ++it) {
    cout << *it << " ";
  }
  cout << endl;

  return (0);
}