IN: classes
ARTICLE: "builtin-classes" "Built-in classes"
-"Every object is an instance of to exactly one canonical " { $emphasis "built-in class" } " which defines its layout in memory and basic behavior."
+"Every object is an instance of exactly one canonical " { $emphasis "built-in class" } " which defines its layout in memory and basic behavior."
$nl
"Corresponding to every built-in class is a built-in type number. An object can be asked for its built-in type number:"
{ $subsection type }
$nl
{ $link "tuples" } " are composed entirely of slots, and instances of " { $link "builtin-classes" } " consist of slots together with intrinsic data."
$nl
-"The "
"The " { $snippet "\"slots\"" } " word property of built-in and tuple classes holds an array of " { $emphasis "slot specifiers" } " describing the slot layout of each instance."
{ $subsection slot-spec }
"Each slot has a reader word; mutable slots have an optional writer word. All tuple slots are mutable, but some slots on built-in classes are not."