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#| Copyright 2024 Peter McGoron
|
| Licensed under the Apache License, Version 2.0 (the "License");
|
| you may not use this file except in compliance with the License.
| You may obtain a copy of the License at
|
| http://www.apache.org/licenses/LICENSE-2.0
|
| Unless required by applicable law or agreed to in writing, software
| distributed under the License is distributed on an "AS IS" BASIS,
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
| See the License for the specific language governing permissions and
| limitations under the License.
|#
#| A portable implementation of `extract-SAHP-descriptor`, `make-new-SAHP`
using a unexported sentinel object.
|#
(define SAHP-sentinel-value
(vector #f))
(define (extract-SAHP-descriptor SAHP)
(SAHP SAHP-sentinel-value))
(define (make-new-SAHP)
(let ((SAHP (make-SAHP-descriptor (make-symbol-mapping)
(make-parameter (make-symbol-mapping))
(make-symbol-hash-table)))))
(lambda (arg1 . arg-rest)
(if (eq? arg1 SAHP-sentinel-value)
SAHP
(call-SAHP SAHP (type-of arg1) (cons arg1 arg-rest)))))
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