Constraint
Specifies a user interface constraint for this parameter.
Usage
To specify a user interface constraint for this parameter, use the following syntax:
Parameter name As parameter_type [ Constraint = "constraint" ] = value ;
Where constraint is a string used by Studio.
Details
The constraint value is used by Studio to provide input validation for the parameter. Its value is not used nor enforced by the class compiler.
This keyword works in conjunction with the Flags keyword. For example, if Flags is set to ENUM, then Constraint should be a comma-separated list of possible parameter values.
Example
Parameter MYPARM [ Constraint = "X,Y,Z", Flags = ENUM ] = "X";
See Also
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“Parameter Definitions” in this book
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“Defining and Referring to Class Parameters” in Using Caché Objects
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“Introduction to Compiler Keywords” in Using Caché Objects
