swirl
Guide to OmniMark 9   OmniMark home
docs home 
IndexConceptsTasksSyntaxLibrariesLegacy LibrariesErrors
 
    Related Concepts  
operator  

is catchable

 
 

Return type: Switch
Returns:       Returns true if the named catch is active at this point in the program, and false otherwise. Replacing is with isnt will reverse the results.

Syntax

named-throw (is | isnt) catchable


Purpose

Tests whether the named catch is active at this point in the program. A catch is active only when it is in a scope that is currently executing.

The named catch can be any of the following:

A compile-time error results if the named catch is not declared within the program.

The following code uses is catchable to see if there is a currently active catch named empty-recordset before throwing to it:

  do when empty-recordset is catchable
     throw empty-recordset
  else
     log-message "Received an empty record-set."
     halt with 1
  done

      Related Concepts
 
 

Top [ INDEX ] [ CONCEPTS ] [ TASKS ] [ SYNTAX ] [ LIBRARIES ] [ LEGACY LIBRARIES ] [ ERRORS ]

OmniMark 9.1.0 Documentation Generated: September 2, 2010 at 1:51:21 pm
If you have any comments about this section of the documentation, please use this form.

Copyright © Stilo International plc, 1988-2010.