Mathematica: Webel: ADT pseudo classes: DEFINITION/CONVENTION: Functions that populate ADTs with reusable ADT-method UpValues are called 'definers' and include '$def' in the name after a Package scope indicator: Example: adt$def$ADT, my$def$MY$CleverList

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Note kind
CONVENTION
NAMING
POLICY
Policy level
STRONG
Keywords

A Webel definer is a top-level (non "ADT-method") function that accepts a unique signature pattern (which uniquely defines each Webel ADT pseudo class), and typically populates it with reusable UpValues.

The name definer was chosen in part to avoid comparison with a constructor in fully-fledged OO.

Using the universal base ADT definer as an example):


adt$def$ADT[
  class_Symbol,
  $usage_String,
  pattern_,
  isAllSuper:(True|False):False
] := Module[{ ...},
...
  class /: get[pattern] := $$;
  class /: head[pattern] := Head[$$];
...
  pattern
];


pattern = adt$def$ADT[MY$ADT$String,
  "An ADT that carries a String",
  MY$ADT$String[$$_String],
  True
];
MY$ADT$String /: stringLength[pattern] := StringLength[$$]; 


my$adt$s = MY$ADT$String["string1"];

stringLength[my$adt$s]

7
Relates to
[STUB] TRAIL: Mathematica: The Webel recipe for Abstract Data Type (ADT) pseudo classes with inheritance for the Wolfram Language
Related notes
[CONVENTION, POLICY]{STRICT} Mathematica: Webel: ADT pseudo classes: POLICY: Every named concrete Abstract Data Type (ADT) class has a ONE unique "signature" (which is the pattern passed to the "definer" functions). To vary a signature, define another unique ADT class name.
[CONVENTION, POLICY]{STRICT} Mathematica: Webel: ADT pseudo classes: POLICY: The Abstract Data Types (ADTs) are stateless functional (although inheritance and overrides are supported), with no caching by default (although there is nice optional caching using CreateUUID[] and Once[]).
[POLICY]{STRICT} Mathematica: Webel: ADT pseudo classes: POLICY: The expression '$$' is reserved as the primary named parameter for the defining pattern of all ADT classes that extend the universal base 'ADT' class.
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