Re: [Help-gsl] Compiling GSL with C++

[James Bergstra]

Another option you might consider is the non-local exit/goto mechanism
that underlies the exception stuff in C++.  The functions longjmp and
setjmp address your exact concern: these functions can break from an
error handler on the top of a stack of gsl functions, way back to a
location in your original C++ application code, where you can safely
throw an exception.  Actually, you would be better off *handling* the
exception where your jump lands, because you would have just effectively
*thrown* an exception in C :)


On Thu, Aug 04, 2005 at 04:38:06PM +0200, Tommy Nordgren wrote:
> 
> Aug 4, 2005 kl. 4:06 PM skrev Kevin Thornton:
> 
> >How about setting a custom gsl error handler that
> >throws an exception?  You can set custom error
> >handlers for the gsl using routines described here:
> >http://www.gnu.org/software/gsl/manual/gsl-ref_3.html#SEC23
> >
> 
>     The GSL routines are C: It is impossible for error handlers  
> called by C
> routines to throw an exception, since throwing an exception across a  
> C routine
> will cause the program to be unconditionally terminated by the C++  
> exception handling system.
> This can only be fixed by recompiling the library source itself with  
> a C++ compiler.
> 
> 
> >The functions take char * arguments which can then be
> >passed along to exceptions, etc.
> >
> >This may be a much simpler solution than modifying the
> >library itself.
> >
> >--Kevin
> >
> >--- Tommy Nordgren <address@hidden> wrote:
> >
> >
> >>
> >>
> >>I'm interested in modifying the GSL source, to make
> >>it compile with a
> >>C++
> >>compiler instead. I would like suggestions on doing
> >>this as easy as
> >>possible.
> >>
> >>The reason I want to do this, is to allow error
> >>handlers to throw
> >>exceptions,
> >>since it's not possible to throw exceptions across
> >>code compiled as C++
> >>(If one tries, the exception handling system will
> >>exit the app, and
> >>this is definitely
> >>not what's wanted when doing time-consuming
> >>computations)
> >>
> >>"Home is not where you are born, but where your
> >>heart finds peace" -
> >>Tommy Nordgren, "The dying old crone"
> >>
> >>
> >>
> >>_______________________________________________
> >>Help-gsl mailing list
> >>address@hidden
> >>http://lists.gnu.org/mailman/listinfo/help-gsl
> >>
> >>
> >
> >
> >Kevin Thornton
> >Committee on Genetics
> >University of Chicago
> >http://www.molpopgen.org
> >
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> >
> 
> "Home is not where you are born, but where your heart finds peace" -
> Tommy Nordgren, "The dying old crone"
> 
> 
> 
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-- 
james bergstra
http://www-etud.iro.umontreal.ca/~bergstrj