cons (System Class) (ANSI and GNU Common Lisp Document)

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#### 14.2.3 cons [System Class]

#### Class Precedence List::

cons, list, sequence, t

#### Description::

A cons is a compound object having two components, called the car and cdr. These form a dotted pair. Each component can be any object.

#### Compound Type Specifier Kind::

Specializing.

#### Compound Type Specifier Syntax::

(`cons`{`[`car-typespec [cdr-typespec]`]`})

#### Compound Type Specifier Arguments::

car-typespec—a type specifier, or the symbol *. The default is the symbol *.

cdr-typespec—a type specifier, or the symbol *. The default is the symbol *.

#### Compound Type Specifier Description::

This denotes the set of conses whose car is constrained to be of type car-typespec and whose cdr is constrained to be of type cdr-typespec. (If either car-typespec or cdr-typespec is *, it is as if the type t had been denoted.)

#### See Also::

Left-Parenthesis, Printing Lists and Conses