Actian X 11.1 | ifndef Statement--Process a Set of Statements without Variables or Logicals

Forms-Based Application Development Tools User Guide > Part 2: Vision > C. Template Files Reference > ifndef Statement--Process a Set of Statements without Variables or Logicals

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ifndef Statement--Process a Set of Statements without Variables or Logicals

Processes a set of statements if a $variable or $$logical is not defined.

The statements within the ifndef-endif block are executed only if $$logical or $variable has not been defined. Statements in the optional else block are executed if the $$logical or $variable has been defined. A $variable can be defined without a value. In this case, the statements in the ifndef block are not executed, because the $variable is defined.

This statement has the following syntax:

##ifndef $$logical | $variable {statement}
[## else {statement}]
## endif

Example—ifndef statement:

##ifndef $mode
/* Caution: '$mode' has not been defined */
##else
/* The value of '$mode' is $mode */
##endif

Last modified date: 11/09/2022