#ifndef __EXCEPT_HPP
#define __EXCEPT_HPP

class Exception {
public:
        Exception(const char *name, const char *who, const char *what)
          : name_(name), who_(who), what_(what)
          {}

        const char *name() const { return name_; }
        const char *who() const { return who_; }
        const char *what() const { return what_; }
protected:
        const char *name_,*who_,*what_;
};

class Overflow : public Exception {
public:
        Overflow(const char *who, const char *what)
          : Exception("Overflow",who,what)
          {}
};

class Underflow : public Exception {
public:
        Underflow(const char *who, const char *what)
          : Exception("Underflow",who,what)
          {}
};

class RangeError : public Exception {
public:
        RangeError(const char *who, const char *what)
          : Exception("RangeError",who,what)
          {}
};

class NoCurrent : public Exception {
public:
        NoCurrent(const char *who, const char *what)
          : Exception("NoCurrent",who,what)
          {}
};

#define _assert(exp,ex) if(!(exp)) throw ex;

#endif