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

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 programmer-defined catch name
• #program-error
• #external-throw

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 Catch and throw

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