• In object-oriented programming, a metaclass is a class whose instances are classes themselves. Unlike ordinary classes, which define the behaviors of...
    21 KB (2,166 words) - 09:53, 28 April 2025
  • access the function's automatic variables. A metaclass is a class where instances are classes. A metaclass describes a common structure of a collection...
    46 KB (4,322 words) - 16:07, 7 July 2025
  • is created, a corresponding metaclass is created automatically; it does not have a name independent of that of the metaclass for which it was created–metaclasses...
    4 KB (451 words) - 17:56, 29 January 2023
  • Look up metaclass in Wiktionary, the free dictionary. In programming languages, a metaclass is a class whose instances are classes. Metaclass may also...
    337 bytes (73 words) - 14:36, 3 December 2023
  • In knowledge representation, particularly in the Semantic Web, a metaclass is a class whose instances can themselves be classes. Similar to their role...
    14 KB (1,692 words) - 04:47, 6 May 2025
  • Thumbnail for Python (programming language)
    example, SpamClass() or EggsClass()); the classes are instances of the metaclass type (which is an instance of itself), thereby allowing metaprogramming...
    174 KB (14,425 words) - 07:25, 18 July 2025
  • Thumbnail for Apache Groovy
    in Groovy goes through the metaclass registry. The changed code can only be accessed from Java by going to the metaclass registry. Groovy also allows...
    34 KB (3,367 words) - 16:16, 25 June 2025
  • Metaclass used to distinguish between cell forms...
    8 KB (894 words) - 18:41, 25 May 2025
  • (method calls) Smalltalk, Objective-C, Common Lisp first-class class metaclass and metaobject Smalltalk, Objective-C, Ruby, Python, Delphi, Common Lisp...
    11 KB (999 words) - 20:01, 27 December 2024
  • abstractmethod NOT_IMPLEMENTED = "You should implement this." class CarElement(metaclass=ABCMeta): @abstractmethod def accept(self, visitor): raise...
    35 KB (3,978 words) - 15:16, 16 July 2025
  • connected." CONNECT_FIRST = "Connect {} first." class RechargeTemplate(metaclass=ABCMeta): @abstractmethod def recharge(self): raise NotImplementedError(NOT_IMPLEMENTED)...
    20 KB (1,913 words) - 13:55, 27 March 2025
  • Thumbnail for Smalltalk
    an instance of the metaclass of that class. Metaclasses in turn are also objects, and are all instances of a class named Metaclass. Classes contain method...
    80 KB (9,662 words) - 05:34, 22 July 2025
  • which does not possess a native metaobject protocol. Kind (type theory) Metaclass Javassist Joose JavaScript meta object system Moose Perl meta object system...
    11 KB (1,201 words) - 09:19, 23 February 2025
  • abstractmethod NOT_IMPLEMENTED = "You should implement this." class DrawingAPI: __metaclass__ = ABCMeta @abstractmethod def draw_circle(self, x, y, radius): raise...
    18 KB (1,903 words) - 22:30, 26 December 2024
  • Archived from the original on 6 January 2006. Retrieved 5 May 2018. "MetaclassTalk: Reflection and Meta-Programming in Smalltalk". Archived from the...
    54 KB (5,341 words) - 03:09, 18 April 2025
  • TRttiInstanceType; Foo := RttiType.GetMethod('Create').Invoke(RttiType.MetaclassType, []).AsObject; try RttiType.GetMethod('Hello').Invoke(Foo, []); finally...
    19 KB (2,030 words) - 18:33, 16 July 2025
  • contents of a class: Attributes, Methods, and Inner classes Message passing Metaclass Metaprogramming Method (computer programming) Mixin Mock object Mock trainwreck...
    6 KB (438 words) - 06:43, 5 April 2025
  • TRttiInstanceType; Subject := RttiType.GetMethod('Create').Invoke(RttiType.MetaclassType, []).AsObject; try RttiType.GetMethod('Hello').Invoke(Subject, []);...
    13 KB (1,450 words) - 15:12, 16 April 2025
  • partition classes, then the partition is called an exhaustive partition. Metaclass (Semantic Web) Ontology Ontology components Description logic Type-token...
    8 KB (1,075 words) - 23:44, 26 April 2025
  • Thumbnail for Common Lisp Object System
    a list of slots (member variables in C++/Java parlance) and a special metaclass. Slots can be allocated by class (all instances of a class share the slot)...
    13 KB (1,733 words) - 19:48, 27 June 2025
  • Thumbnail for Python syntax and semantics
    even classes. Classes, as objects, have a class, which is known as their metaclass. Python also supports multiple inheritance and mixins. The language supports...
    59 KB (6,788 words) - 17:47, 14 July 2025
  • Thumbnail for Package diagram
    2017), Package Merge is no longer used within the specification. "Every metaclass is specified completely in one clause." Package: a general purpose mechanism...
    5 KB (549 words) - 21:39, 19 March 2025
  • Unified Modeling Language (UML) of the Object Management Group (OMG) Metaclass (Semantic Web), a featured allowed by OWL to represent knowledge Multimedia...
    43 KB (4,300 words) - 22:38, 18 July 2025
  • eigenvector and eigenspace in mathematics and physics Eigenclass, synonym to metaclass in the Ruby programming language Eigenbehaviour, with its connection to...
    2 KB (200 words) - 05:54, 13 March 2025
  • languages). A class has a constructor and a destructor. A class has a metaclass. An attribute is a property of the class that defines it. An attribute...
    5 KB (626 words) - 03:37, 22 July 2025
  • Thumbnail for Serialization
    cyclic, recursive and shared structures, storage/retrieval of class and metaclass info and include mechanisms for "on the fly" object migration (i.e. to...
    42 KB (4,974 words) - 07:49, 28 April 2025
  • subclassing. A class has a constructor and a destructor. A class has a metaclass. A class has zero or more method modifiers. These modifiers can apply...
    30 KB (4,017 words) - 12:44, 30 April 2025
  • Thumbnail for Kaleida Labs
    All objects are instances of a class, and classes are instances of a MetaClass object. As in LISP, there are no statements, and every line in a ScriptX...
    20 KB (2,523 words) - 04:52, 14 August 2024
  • many objects in Inform do not inherit from any class, other than the "metaclass" Object. However, objects very frequently have attributes (boolean properties...
    35 KB (3,489 words) - 23:51, 22 June 2025
  • Thumbnail for Object REXX
    interpreter to define a new class. After the class name, options such as METACLASS, SUBCLASS, MIXINCLASS, ABSTRACT and INHERIT can be set in order to use...
    78 KB (7,394 words) - 12:24, 11 July 2025