# Special Objects

# absent-obj

(def absent-obj)

Special object used by Gambit primitives to signal absent optional values.

# absent-value

(def absent-value)

Special object used to denote missing hash values.

# true

(true . args) -> #t

Returns #t, ignoring its arguments.

# true?

(true? obj) -> boolean

  obj := any object

:::

Returns true if the object is #t.

# false

(false . args) -> #f

Returns #f, ignoring its arguments.

# void

(void . args) -> #!void

Returns #!void, ignoring its arguments

# void?

(void? obj) -> boolean

Returns true if the object obj is #!void.

# eof-object

(eof-object . args)

Returns the eof object, ignoring its arguments.

# identity

(identity x) -> x

  x := any value

The identity function, eg. returns anything passed to it.

# dssl-object?

(dssl-object? obj) -> boolean

  obj := any object

Returns true if the object is a DSSL syntactic token.

# dssl-key-object?

(dssl-key-object? obj) -> boolean

  obj := any object

Returns true if the object is #!key.

# dssl-rest-object?

(dssl-rest-object? obj) -> boolean

  obj := any object

Returns true if the object is #!rest.

# dssl-optional-object?

(dssl-optional-object? obj) -> boolean

  obj := any object

Returns true if the object is #!optional.

# immediate?

(immediate? obj) -> boolean

  obj := any object

Returns true if the object obj is an immediate value.