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meta.abstractDetails

Package: meta

Find abstract methods and properties

Syntax

meta.abstractDetails(ClassName)
meta.abstractDetails(mc)
absMembers = meta.abstractDetails(___)

Description

meta.abstractDetails(ClassName) displays a list of abstract methods and properties for the class with name ClassName. Use the fully specified name for classes in packages. MATLAB® displays all public and protected abstract methods and properties, including those declared Hidden.

meta.abstractDetails(mc) displays a list of abstract methods and properties for the class represented by the meta.class object mc.

absMembers = meta.abstractDetails(___) returns an array of the metaclass objects corresponding to the abstract members of the class, and can include any of the input arguments in previous syntaxes. If the class has both abstract methods and abstract properties, absMembers is a heterogeneous array of class meta.MetaData containing meta.method and meta.property objects.

A class can be abstract without defining any abstract methods or properties if it declares the Abstract class attribute. In this case, meta.abstractDetails returns no abstract members for that class, but the class is abstract. See Determine If a Class Is Abstract for more information.

Input Arguments

ClassName

Name of the class specified as a character string (for example, 'MyClass')

mc

meta.class object representing the class (for example, ?MyClass)

Output Arguments

absMembers

Array of metaclass objects representing abstract class members

Examples

expand all

Display Abstract Member Names

Define the class, AbsBase, with an abstract property:

classdef AbsBase
   properties (Abstract)
      Prop1
   end
   methods(Abstract)
      result = methodOne(obj)
      output = methodTwo(obj)
   end
end

Pass the class name (AbsBase) as a string:

meta.abstractDetails('AbsBase')

meta.abstractDetails displays the names of the abstract properties and methods defined in the class AbsBase.

Abstract methods for class AbsBase:
    methodTwo   % defined in AbsBase
    methodOne   % defined in AbsBase

Abstract properties for class AbsBase:
    Prop1   % defined in AbsBase

Return Abstract Member Metaclass Objects

Pass a meta.class object representing the AbsBase class and return the metaclass objects for the abstract members. Use the definition of the AbsBase class from the previous example.

mc = ?AbsBase;
absMembers = meta.abstractDetails(mc);

absMembers is a heterogeneous array containing a meta.property object for the Prop1 abstract property and meta.method objects for the methodOne and methodTwo abstract methods.

List the names of the metaclass objects.

for k=1:length(absMembers)
   disp(absMembers(k).Name)
end
methodTwo
methodOne
Prop1

Find Inherited Abstract Members

Derive the SubAbsBase class from AbsBase, which is defined in a previous example.

classdef SubAbsBase < AbsBase
   properties 
      SubProp = 1;
   end
   methods
      function result = methodOne(obj)
         result = obj.SubProp + 1;
      end
   end
end

Display the names of the abstract members inherited by SubAbsBase.

meta.abstractDetails('SubAbsBase')

Abstract methods for class SubAbsBase:
    methodTwo   % defined in AbsBase

Abstract properties for class SubAbsBase:
    Prop1   % defined in AbsBase

To make SubAbsBase a concrete class, you need to implement concrete versions of methodTwo and Prop1 in the subclass.

See Also

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