Implement iterator for SQLiteStmt about ares HOT 3 CLOSED

std::list<int> l = {1, 2, 3, 4};
std::list<int>::iterator itr1 = l.begin(),
   itr2 = ++itr1;
assert(*itr1 == 2);
assert(*itr2 == 1);

SQLiteStmt::iterator itr=stmt.exec(), end;
while(itr != end)
{
   std::cout << static_cast<int>(*(itr++)) << std::endl;
}

SQLite db(...);
try
{
   SQLiteStmt::iterator itr1 = db.execute("SELECT x FROM ..."), end;
   while(itr1 != end) { sum += *itr1; ++itr1; }
   SQLiteStmt stmt = db.query("SELECT x FROM ...");
   SQLiteStmt::iterator itr2 = stmt.execute();
   while(itr2 != end) { sum += *itr2; ++itr2; }
}catch(SQLiteError & e) {
   ...
}