36 lines
1.0 KiB
Racket
36 lines
1.0 KiB
Racket
#lang racket/base
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;; Misc support routines not (yet) provided by racket itself
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(provide non-object-struct?
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struct-type-name
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struct-type-constructor-arity
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struct->struct-type)
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(require (only-in racket/class object?))
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;; Any -> Boolean
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;; Racket objects are structures, so we reject them explicitly for
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;; now, leaving them opaque to unification.
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(define (non-object-struct? x)
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(and (struct? x)
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(not (object? x))))
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;; struct-type -> Symbol
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;; Extract just the name of the given struct-type.
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(define (struct-type-name st)
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(define-values (name x2 x3 x4 x5 x6 x7 x8) (struct-type-info st))
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name)
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;; StructType -> Natural
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(define (struct-type-constructor-arity st)
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(define-values (x1 arity x3 x4 x5 x6 x7 x8) (struct-type-info st))
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arity)
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;; Structure -> StructType
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;; Errors when given any struct that isn't completely transparent/prefab.
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(define (struct->struct-type p)
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(define-values (t skipped?) (struct-info p))
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(when skipped? (error 'struct->struct-type "Cannot reflect on struct instance ~v" p))
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t)
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