zl:1 - FTP

defstruct-define-type 156
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I •
The :export opton is accepted by zl:defstruct but not by defstruct. Stylistically,
it is preferable to export any external interfaces in the package
declarations instead of scattering :export options throughout a program's
source files.
: export The :export option exports the specified symbols from
the package in which the structure is defined. This option
accepts the following as arguments: the names of
slots and the following options: :alterant, : constructor,
:copier, :predicate, :size-macro, and :size-symbol.
The following example shows the use of : export.
(zl :defstruct (2d-moving-object
(:type :array)
:conc-name
mass
x-pas
y-pos
x-velocity
y-velocity)
;; export all accessors and the
;; make-2d-moving-object constructor
(:export :accessors :constructor))
See the section "Importing and Exporting Symbols" in
Symbolics Common Lisp: Language Concepts.
defstruct-define-type type &body options Macro
Teaches defstruct and zl:defstruct about new types that it can use to
implement structures.
The body of this function is shown in the following example:
(defstruct-define-type type
option-l
option-2
... )
where each option is either the symbolic name of an option or a list of the
form (option-name. rest). See the section "Options To
defstruct-define-type" in Symbolics Common Lisp: Language Concepts.
Different options interpret rest in different ways. The symbol type is given
an si:defstruct-type-description property of a structure that describes the
type completely.