#include <iostream>
#include <string>
#include <stdexcept>
using namespace std;

class StrList {

public:
  static int usize ( ); 
  static char* toa (int ); 
  static int toi (char* ); 

private:
  static char *strlist[ ];
  static const int setsz = 3;
};

char* StrList::strlist[ ] = {"argon", "boron", "carbon"};

int StrList::usize( ) { return setsz; } 

char* StrList::toa(int n) {
  string estr = "argument to StrList::toa( ) out of range.";
  if ( n < 0 || n >= usize( ) )
    throw out_of_range( estr );
  else
    return strlist[n];
}

int StrList::toi(char* str) {
  string instr = str;
  string sa = strlist[0];
  string sb = strlist[1];
  string sc = strlist[2];
  string estr = "argument to StrList::toi( ) not in Tsset.";
  if ( str ) {
    switch( str[0] ) {
      case 'a': if ( instr == sa ) return 0;
                else break;
      case 'b': if ( instr == sb ) return 1;
                else break;
      case 'c': if ( instr == sc ) return 2;
    }
  }
  throw invalid_argument( estr );
}

int main ( ) {

  int i;

  cout << "Test of StrList class members:" << endl;  

  cout << "usize( ) = " << StrList::usize( ) << endl;

  for ( i = 0; i < 3; i++ ) 
     cout << "toa(" << i << ") = " << StrList::toa(i) << endl;

   cout << "toa(-1) = " ;
   try { cout << StrList::toa(-1) << endl; }
   catch (out_of_range e) {
     cout << "\nException thrown and caught: " << e.what( ) << endl;
   }
 
   cout << "toi(boron) = " << StrList::toi("boron") << endl;

   cout << "toi(borax) = " ;
   try { cout << StrList::toi("borax") << endl; }
   catch (invalid_argument e) {
     cout << "\nException thrown and caught: " << e.what( ) << endl;
   }

  return 0;
}