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https://github.com/ashinn/chibi-scheme.git
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8b5eb68238
They can be close()d explicitly with close-file-descriptor, and will close() on gc, but only explicitly closing the last port on them will close the fileno. Notably needed for network sockets where we open separate input and output ports on the same socket.
32 lines
1.1 KiB
Scheme
32 lines
1.1 KiB
Scheme
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; The most basic set interface. We provide a data type, low-level
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;; constructor, and membership test. This allows libraries to provide
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;; an iset API without needing to include the full iset library.
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(define-record-type Integer-Set
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(%make-iset start end bits left right)
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iset?
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(start iset-start iset-start-set!)
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(end iset-end iset-end-set!)
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(bits iset-bits iset-bits-set!)
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(left iset-left iset-left-set!)
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(right iset-right iset-right-set!))
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(define (make-iset . opt)
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(if (null? opt)
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(%make-iset 0 0 0 #f #f)
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(let ((end (if (pair? (cdr opt)) (cadr opt) (car opt))))
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(%make-iset (car opt) end #f #f #f))))
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(define (iset-contains? iset n)
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(let lp ((is iset))
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(let ((start (iset-start is)))
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(if (< n start)
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(let ((left (iset-left is))) (and left (lp left)))
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(let ((end (iset-end is)))
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(if (> n end)
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(let ((right (iset-right is))) (and right (lp right)))
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(let ((bits (iset-bits is)))
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(or (not bits)
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(bit-set? (- n start) bits)))))))))
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