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wefts_error.h

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/*
   wefts_error.h
   Error classes - for trhow statements.

   $Id: wefts_error.h,v 1.1 2003/08/15 18:03:11 jonnymind Exp $
---------------------------------------------
   Begin      : 2003-08-15 17:13
   Author     : Giancarlo Niccolai

   Last modified because:

*/

/**************************************************************************
*   This program is free software; you can redistribute it and/or modify  *
*   it under the terms of the GNU Library General Public License as       *
*   published by the Free Software Foundation; either version 2.1 of the  *
*   License, or (at your option) any later version.                       *
***************************************************************************/


#ifndef WT_ERROR_H
#define WT_ERROR_H

#include <string>
#include <iostream>

namespace Wefts {

class Error
{
private:
   int m_osCode;

public:
   Error( int code=0 ) { m_osCode = code;}

   int osCode() const { return m_osCode; }

   virtual const std::string description() { return "Generic low-level error"; }

   friend std::ostream& operator<<( std::ostream &stream, Error &err );
};


class NotJoinableError: public Error
{
public:
   NotJoinableError( int code=0 ): Error( code ) {}

   virtual const std::string description() const {
      return "Join called on a non-joinable thread";
   }
};

class InvalidError: public Error
{
public:
   InvalidError( int code=0 ): Error( code ) {}

   virtual const std::string description() const {
      return "Using an object in an invalid state";
   }
};

class InitError: public Error
{
public:
   InitError( int code=0 ): Error( code ) {}

   virtual const std::string description() const {
      return "Object cannot be initialized";
   }
};

class StartError: public Error
{
public:
   StartError( int code=0 ): Error( code ) {}

   virtual const std::string description() const {
      return "Impossible to start more threads";
   }
};

}

#endif

/* end of wefts_error.h */

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