Function
rules
Completing the New or Save As form
|
|
Create a library rule before creating functions for the library. A function rule has two key parts:
Field |
Description |
| Type |
Select |
| Library Name |
|
| Function Name |
Enter a name for a function. Begin the name with a letter and use only letters and digits. The name must be a valid identifier; see Entering identifiers. Overloading functions
To overload a function, open the original function and
use the Save As toolbar button ( If one function has multiple signatures, the system generates a hash function of the parameter types to distinguish them internally; this can result in very long function names. When selecting a function, you can generally choose the one with the simpler name. |
For general information about the New form, see Completing the new rule dialog box. For general information on the Save As form, see How to enter rule keys using Save As.
To support function name overloading, the internal format of the function rule key incorporates the parameter names, order, and types.
When searching for function rules, the system filters candidate rules based on a requestor's RuleSet list of RuleSets and versions.
Time-qualified and circumstance-qualified rule resolution features are not available for function rules. The class hierarchy is not searched.
Select the name of
an existing library rule in the RuleSet that is also to
contain this function. 
You can choose a function name that already
exists in that library (or other libraries of that name),
if the type, order, and number of the new function's
parameters are not the same as the type, order, and
number of the existing function's parameters. The
function name and parameter types together are known as
the signature.
). You can't
use the New toolbar tool (
) for this.