8. Controlling Dynamism

This section describes how you can selectively control the dynamism of Dylan's functions and classes. The techniques for selectively controlling dynamism in Dylan are:

• Declaring a class to be sealed or open
• Declaring a class to be abstract or concrete
• Declaring a class to be primary or free
• Declaring a generic function to be sealed or open
• Using the seal generic form, or using the abbreviations define sealed method and sealed slot.

Syntactically, these are all expressed as adjectives on the generic function, class, or method definition, or slot specification, with the exception of the seal generic form.