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#lang racket/base
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(require racket/match
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"struct.rkt")
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(provide (all-defined-out))
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(define-syntax-rule (define-guarded-parameters [ID PRED STARTING-VALUE] ...)
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(begin
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(define ID
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(make-parameter STARTING-VALUE
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(λ (val)
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(unless (PRED val)
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(raise-argument-error 'ID (format "~a" (object-name PRED)) val))
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val))) ...))
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(define-guarded-parameters
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[current-attrs (λ (xs) (and (list? xs) (andmap attr? xs))) null]
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[current-show-timing? boolean? #false]
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[current-strict-attrs? boolean? #false]
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[current-use-preconditions? boolean? #true]
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[current-use-postconditions? boolean? #true])
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