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Usage of TRAP_EXCEPTION@

 
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Nathan Hatcher



Joined: 09 Apr 2010
Posts: 1
PostPosted: Fri May 24, 2013 4:51 pm    Post subject: Usage of TRAP_EXCEPTION@ Reply with quote
Can anyone provide a working example for how to use the TRAP_EXCEPTION@ intrinsic function?
The example included in the help file is not functional. If I type in the help file code "as-is" I get an error that TRAP_EXCEPTION@ was declared as external twice, once in the included exceptn.ins file and once in the example code. If I comment out the declaration in the example code, then nothing happens when I execute. Watching execution in the debugger it looks like the value of FLT_DIV_ZERO isn't available in the example code.
Thanks in advance for advice on getting this function to work.
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Nate Hatcher
Optimized Gas Treating, Inc.
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PaulLaidler
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Joined: 21 Feb 2005
Posts: 8210
Location: Salford, UK
PostPosted: Fri May 24, 2013 7:23 pm    Post subject: Reply with quote
Yes. The declaration of TRAP_EXCEPTION@ is in EXCEPTN.INS so it should removed from the code...

Code:
PROGRAM TrapException
  INCLUDE <EXCEPTN.INS>
  INTEGER DivZeroHandler, OldHandler
  EXTERNAL DivZeroHandler
  REAL r, zero
  OldHandler=TRAP_EXCEPTION@(FLT_DIV_ZERO, DivZeroHandler)
  zero=0.0
  r=1.234/zero
  PRINT *, 'Normal termination'
END
INTEGER FUNCTION DivZeroHandler()
  INCLUDE <EXCEPTN.INS>
  PRINT *, 'Float divide by zero trapped'
  DivZeroHandler= NONCONTINUABLE_EXCEPTION
END


This program now functions correctly on the assumption that continuation after a divide by zero is not possible. The exception is handled and reported but continuation is not possible in this case.

Which exception are you interested in? If I remember correctly, some exceptions can be trapped with full recovery.
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