6.5 Mixins

6.6 Traits

6.7 Object and Class Contracts

6.8 Object Equality and Hashing

6.9 Object Serialization

6.10 Object Printing

6.11 Object, Class, and Interface Utilities

6.12 Surrogates

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mixin

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6.5Mixins🔗 i

syntax
( mixin (interface-expr...)(interface-expr...)
class-clause...)

Produces a mixin, which is a procedure that encapsulates a class extension, leaving the superclass unspecified. Each time that a mixin is applied to a specific superclass, it produces a new derived class using the encapsulated extension.

The given class must implement interfaces produced by the first set of interface-exprs. The result of the procedure is a subclass of the given class that implements the interfaces produced by the second set of interface-exprs. The class-clauses are as for class* , to define the class extension encapsulated by the mixin.

Evaluation of a mixin form checks that the class-clauses are consistent with both sets of interface-exprs.

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