Alternative record-definition forms that allow specifying slot types, giving more opportunities for type-analysis and type-based optimization. Specifying slot types also is useful for documentation.
The record-definition forms define-record and define-record-type from the core system, and defstruct from the egg of the same name are shadowed and provide the extended type-specification syntax.
This extension requires CHICKEN 4.7.5 or later.
define-record[syntax] (define-record NAME SLOT ...)
Equivalent to define-record where SLOT slot may optionally be of the form
(SLOTNAME : TYPE)
((setter SLOTNAME) : TYPE)
define-record adds the following type-declarations:
(: make-NAME (TYPE1 ... -> (struct NAME))) (: NAME? (* -> boolean : (struct NAME))) (: NAME-SLOTNAME ((struct NAME) -> TYPE)) (: NAME-SLOTNAME-set! ((struct NAME) TYPE -> undefined))
Additionally, specializations are enabled that rewrite slot-accessors to very efficient code, if the compiler can prove that the arguments are of the correct type.
define-record-type[syntax] (define-record-type NAME (CTOR FIELDNAME ...) PRED FIELD ...)
Defines a SRFI-9 record type. FIELD may be any of
(FIELDNAME GETTER) (FIELDNAME GETTER : TYPE) (FIELDNAME GETTER SETTER) (FIELDNAME GETTER SETTER : TYPE)
(: CTOR (TYPE1 ... -> (struct NAME))) (: PRED (* -> boolean : (struct NAME))) (: GETTER ((struct NAME) -> TYPE)) (: SETTER ((struct NAME) TYPE -> undefined))
Specializations are added here as well.
defstruct[syntax] (defstruct NAME SLOT ...)
Alternative form of defstruct. SLOT may be any of
SLOTNAME (SLOTNAME DEFAULT) (SLOTNAME : TYPE) ((SLOTNAME DEFAULT) : TYPE)
(: make-NAME (#!rest * -> (struct NAME))) (: NAME? (* -> boolean : (struct NAME))) (: NAME-SLOTNAME ((struct NAME) -> TYPE)) (: NAME-SLOTNAME-set! ((struct NAME) TYPE -> undefined)) (: set-NAME! ((struct name) #!rest * -> (struct name))) (: update-NAME ((struct name) #!rest * -> (struct name)))
Adds specializations as appropriate.
Copyright (c) 2011, Felix L. Winkelmann All rights reserved.
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THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- initial release
- shadow original definition forms
- various bugfixes