54 lines
1.3 KiB
Scheme
54 lines
1.3 KiB
Scheme
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(load-extension "./libexample" "scm_init_example_module")
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; repeatedly invoke a procedure with v and an index as arguments
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(define (with-vector v proc size-proc)
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(let ((size (size-proc v)))
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(define (with-vector-item v i)
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(if (< i size)
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(begin
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(proc v i)
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(with-vector-item v (+ i 1)))))
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(with-vector-item v 0)))
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(define (with-IntVector v proc)
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(with-vector v proc IntVector-length))
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(define (with-DoubleVector v proc)
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(with-vector v proc DoubleVector-length))
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(define (print-DoubleVector v)
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(with-DoubleVector v (lambda (v i) (display (DoubleVector-ref v i))
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(display " ")))
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(newline))
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; Call average with a Scheme list...
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(display (average '(1 2 3 4)))
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(newline)
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; ... or a wrapped std::vector<int>
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(define v (new-IntVector 4))
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(with-IntVector v (lambda (v i) (IntVector-set! v i (+ i 1))))
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(display (average v))
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(newline)
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(delete-IntVector v)
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; half will return a Scheme vector.
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; Call it with a Scheme vector...
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(display (half #(1 1.5 2 2.5 3)))
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(newline)
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; ... or a wrapped std::vector<double>
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(define v (new-DoubleVector))
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(map (lambda (i) (DoubleVector-push! v i)) '(1 2 3 4))
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(display (half v))
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(newline)
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; now halve a wrapped std::vector<double> in place
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(halve-in-place v)
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(print-DoubleVector v)
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(delete-DoubleVector v)
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(exit 0)
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