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IexBaseExc.h

///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2002, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
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// All rights reserved.
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// modification, are permitted provided that the following conditions are
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// *       Redistributions in binary form must reproduce the above
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// distribution.
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// its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission. 
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#ifndef INCLUDED_IEXBASEEXC_H
#define INCLUDED_IEXBASEEXC_H


//----------------------------------------------------------
//
//    A general exception base class, and a few
//    useful exceptions derived from the base class.
//
//----------------------------------------------------------

#include <string>
#include <exception>
#include <sstream>

namespace Iex {

#if defined PLATFORM_WINDOWS && _MSC_VER
// Tell MS VC++ to suppress exception specification warnings
#pragma warning(disable:4290)
#endif

//-------------------------------
// Our most basic exception class
//-------------------------------

00063 class BaseExc: public std::string, public std::exception
{
  public:

    //----------------------------
    // Constructors and destructor
    //----------------------------

    BaseExc (const char *s = 0) throw();  // std::string (s)
    BaseExc (const std::string &s) throw();     // std::string (s)
    BaseExc (std::stringstream &s) throw();     // std::string (s.str())

    BaseExc (const BaseExc &be) throw();
    virtual ~BaseExc () throw ();

    //--------------------------------------------
    // what() method -- e.what() returns e.c_str()
    //--------------------------------------------

    virtual const char * what () const throw ();


    //--------------------------------------------------
    // Convenient methods to change the exception's text
    //--------------------------------------------------

    BaseExc &           assign (std::stringstream &s);      // assign (s.str())
    BaseExc &           operator = (std::stringstream &s);

    BaseExc &           append (std::stringstream &s);      // append (s.str())
    BaseExc &           operator += (std::stringstream &s);


    //--------------------------------------------------
    // These methods from the base class get obscured by
    // the definitions above.
    //--------------------------------------------------

    BaseExc &           assign (const char *s);
    BaseExc &           operator = (const char *s);

    BaseExc &           append (const char *s);
    BaseExc &           operator += (const char *s);


    //--------------------------------------------------
    // Stack trace for the point at which the exception
    // was thrown.  The stack trace will be an empty
    // string unless a working stack-tracing routine
    // has been installed (see below, setStackTracer()).
    //--------------------------------------------------

    const std::string & stackTrace () const;

  private:

    std::string         _stackTrace;
};


//-----------------------------------------------------
// A macro to save typing when declararing an exception
// class derived directly or indirectly from BaseExc:
//-----------------------------------------------------

#define DEFINE_EXC(name, base)                                \
    class name: public base                             \
    {                                             \
      public:                                                   \
      name (const char* text=0)      throw(): base (text) {}      \
      name (const std::string &text) throw(): base (text) {}      \
      name (std::stringstream &text) throw(): base (text) {}      \
    };


//--------------------------------------------------------
// Some exceptions which should be useful in most programs
//--------------------------------------------------------

DEFINE_EXC (ArgExc,   BaseExc)       // Invalid arguments to a function call

DEFINE_EXC (LogicExc, BaseExc)       // General error in a program's logic,
                         // for example, a function was called
                         // in a context where the call does
                         // not make sense.

DEFINE_EXC (InputExc, BaseExc)       // Invalid input data, e.g. from a file

DEFINE_EXC (IoExc, BaseExc)    // Input or output operation failed

DEFINE_EXC (MathExc,  BaseExc)       // Arithmetic exception; more specific
                         // exceptions derived from this class
                         // are defined in ExcMath.h

DEFINE_EXC (ErrnoExc, BaseExc)       // Base class for exceptions corresponding
                         // to errno values (see errno.h); more
                         // specific exceptions derived from this
                         // class are defined in ExcErrno.h

DEFINE_EXC (NoImplExc, BaseExc)  // Missing method exception e.g. from a
                         // call to a method that is only partially
                         // or not at all implemented. A reminder
                         // to lazy software people to get back
                         // to work.

DEFINE_EXC (NullExc, BaseExc)        // A pointer is inappropriately null.

DEFINE_EXC (TypeExc, BaseExc)        // An object is an inappropriate type,
                         // i.e. a dynamnic_cast failed.


//----------------------------------------------------------------------
// Stack-tracing support:
// 
// setStackTracer(st)
//
//    installs a stack-tracing routine, st, which will be called from
//    class BaseExc's constructor every time an exception derived from
//    BaseExc is thrown.  The stack-tracing routine should return a
//    string that contains a printable representation of the program's
//    current call stack.  This string will be stored in the BaseExc
//    object; the string is accesible via the BaseExc::stackTrace()
//    method.
//
// setStackTracer(0)
//
//    removes the current stack tracing routine.  When an exception
//    derived from BaseExc is thrown, the stack trace string stored
//    in the BaseExc object will be empty.
//
// stackTracer()
//
//    returns a pointer to the current stack-tracing routine, or 0
//    if there is no current stack stack-tracing routine.
// 
//----------------------------------------------------------------------

typedef std::string (* StackTracer) ();

void        setStackTracer (StackTracer stackTracer);
StackTracer stackTracer ();


//-----------------
// Inline functions
//-----------------

inline BaseExc &
BaseExc::operator = (std::stringstream &s)
{
    return assign (s);
}


inline BaseExc &
BaseExc::operator += (std::stringstream &s)
{
    return append (s);
}


inline BaseExc &
BaseExc::assign (const char *s)
{
    std::string::assign(s);
    return *this;
}


inline BaseExc &
BaseExc::operator = (const char *s)
{
    return assign(s);
}


inline BaseExc &
BaseExc::append (const char *s)
{
    std::string::append(s);
    return *this;
}


inline BaseExc &
BaseExc::operator += (const char *s)
{
    return append(s);
}


inline const std::string &
BaseExc::stackTrace () const
{
    return _stackTrace;
}

#if defined PLATFORM_WINDOWS && _MSC_VER
#pragma warning(default:4290)
#endif

} // namespace Iex

#endif

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