/* istring.h */
#ifndef ISTRING_H
#define ISTRING_H
#include <cstring.h>

class Istring;

int numeric(string &s);
inline int int_val(const string &s) {return atoi(s.c_str()); }
inline static string itostr(int i)
{
  char s[20];
  itoa(i,s,10);
  return string(s);
}


class Istring : public string {
public:
  Istring() : string()            {};
  Istring(string &s) : string(s)  {};
  Istring(const char *s) : string(s) {};
  Istring(TSubString &ss) : string(ss) {};
  Istring(int i) : string()       { *this = itostr(i);                       }
  Istring(char c) : string(c)     {};
  operator int()                  { return int_val(*this);                   }
  operator char()                 { return *(this->c_str());                 }
  Istring &operator=(int i)       { *this = itostr(i);  return *this;        }
  Istring &operator=(char c)      { *this = string(c);  return *this;        }
};

string operator+(const Istring &s1,const Istring &s2);
string operator+(char c, const Istring &s);
string operator+(const Istring &s, char c);
string operator+(const Istring &s, int i);
string operator+(int i, const Istring &s);
string operator+(const char *s1, const Istring &s2);
string operator+(const Istring &s1,const char *s2);
#endif