IexBaseExc.h

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#ifndef INCLUDED_IEXBASEEXC_H
#define INCLUDED_IEXBASEEXC_H

#include "IexNamespace.h"
#include "IexExport.h"

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

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

IEX_INTERNAL_NAMESPACE_HEADER_ENTER


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

class IEX_EXPORT BaseExc: 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 ();
        const std::string &  name() const;


    //--------------------------------------------------
    // 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;


    //--------------------------------------------------
    // Conversion operators.
    //--------------------------------------------------
    operator            const char *() const
                            { return what(); }


  private:
        std::string                                             _what;
    std::string                     _stackTrace;
};


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

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

// For backward compatibility.
#define DEFINE_EXC(name, base) DEFINE_EXC_EXP(, name, base)


//--------------------------------------------------------
// Some exceptions which should be useful in most programs
//--------------------------------------------------------
DEFINE_EXC_EXP (IEX_EXPORT, ArgExc, BaseExc)    // Invalid arguments to a function call

DEFINE_EXC_EXP (IEX_EXPORT, 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_EXP (IEX_EXPORT, InputExc, BaseExc)  // Invalid input data, e.g. from a file

DEFINE_EXC_EXP (IEX_EXPORT, IoExc, BaseExc)     // Input or output operation failed

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

DEFINE_EXC_EXP (IEX_EXPORT, 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_EXP (IEX_EXPORT, 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_EXP (IEX_EXPORT, NullExc, BaseExc)   // A pointer is inappropriately null.

DEFINE_EXC_EXP (IEX_EXPORT, 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) ();

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


IEX_INTERNAL_NAMESPACE_HEADER_EXIT

#endif // INCLUDED_IEXBASEEXC_H