Find element in qi::symbols

Question

I have a struct like this one :

struct SNumbers: qi::symbols<char, signed>
{
   SNumbers()
   {
      add
         ("One", eOne)    
         ("Two", eTwo)
         ("Three", eThree)
         ("Four", eFour)
         ("Five", eFive)
    ;
   }
} Numbers;

I want to find/iterate to access char field by enum type. Can you help me ? I tried to use find() and for_each(), but I failed.