CODEWITHSUNDEEP
c++classc++11exception
Cooli
Cooli

Reputation: 169

C++ create new exceptions by inheriting from the std::exception

Hi I have a c++ assignment in which I need to create my own exceptions. My exception class has to inherit from the std::exception and 2 other classes need to derive from that one. The way I have it right now it actually compiles and works pretty much ok. But when the exception is thrown I get e.g.: terminate called after throwing an instance of 'stack_full_error' what(): The stack is full! Aborted (core dumped)

I am very confused about this matter and unfortunately I could not find much help on the web or in my books. My header is something like the following:

class stack_error : public std::exception
{
 public:
  virtual const char* what() const throw();
  stack_error(string const& m) throw(); //noexpect;
  ~stack_error() throw();
  string message;
 private:
};

class stack_full_error : public stack_error
{
 public:
  stack_full_error(string const& m) throw();
  ~stack_full_error() throw();
  virtual const char* what() const throw();
};

class stack_empty_error : public stack_error
{
 public:
  stack_empty_error(string const& m) throw();
  ~stack_empty_error() throw();
  virtual const char* what() const throw();
};

and my implementation is:

stack_error::stack_error(string const& m) throw()
: exception(), message(m)
{
}

stack_error::~stack_error() throw()
{  
}

const char* stack_error::what() const throw()
{
  return message.c_str();
}

stack_full_error::stack_full_error(string const& m) throw() 
  : stack_error(m)
{   
}

stack_full_error::~stack_full_error() throw()
{

}

const char* stack_full_error::what() const throw()
{
  return message.c_str();
}

stack_empty_error::stack_empty_error(string const& m) throw() 
  : stack_error(m)
{   
}

stack_empty_error::~stack_empty_error() throw()
{

}

const char* stack_empty_error::what() const throw()
{
  return message.c_str();
}

any help would be greatly appreciated!

Upvotes: 3

Views: 2693

Answers (1)

user1508519
user1508519

Reputation:

You need to actually catch your exception:

try
{
    throw stack_full_error("Stack is full!");
} catch(stack_full_error& ex)
{
    std::cout << ex.what();
}

Upvotes: 3

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