hello, i'm maintaining and developing some code i wrote which is using something is a hidden feature or bug in vector-copy?
here is the code but there no need to understand it, the problem is explained after ;; scheme@(guile-user)> (define gva (growable-vector 1 2 3 4 5)) ;; scheme@(guile-user)> (define gva2 (growable-vector-resize gva 8)) ;; growable-vector-resize : new-vector :#(1 2 3 4 5 #<unspecified> #<unspecified> #<unspecified>) ;; scheme@(guile-user)> (describe gva2) ;; #<<growable-vector> 10394d640> is an instance of class <growable-vector> ;; Slots are: ;; v = #(1 2 3 4 5 #<unspecified> #<unspecified> #<unspecified>) (define-method (growable-vector-resize (gv <growable-vector>) (new-size <integer>)) ;; fill unspecified (define actual-size (vector-length gv)) (define old-vector (growable-vector-v gv)) (define new-vector (vector-copy old-vector 0 new-size)) ;;(display "growable-vector-resize : new-vector :") (display new-vector) (newline) (growable-vector-set-v! gv new-vector)) it seems that vector-copy when given a end-index greater than the length of vector to copy does not return an error but create a new vector of the good size indeed: scheme@(guile-user)> (define v (make-vector 7 1) ) scheme@(guile-user)> v $2 = #(1 1 1 1 1 1 1) scheme@(guile-user)> (vector-copy v) $3 = #(1 1 1 1 1 1 1) scheme@(guile-user)> (vector-copy v 0 10) $4 = #(1 1 1 1 1 1 1 #<unspecified> #<unspecified> #<unspecified>) here 10 is greater than (length v) but it works and return: #(1 1 1 1 1 1 1 #<unspecified> #<unspecified> #<unspecified>) but the doc does not specify that: "Scheme Procedure: vector-copy vec [start [end]]C Function: scm_vector_copy (vec) Returns a freshly allocated vector containing the elements of vec in the range [start ... end). start defaults to 0 and end defaults to the length of vec." by default end is length of vec, so if i specify an end greater than length of vec should it not be normal to return an error? Damien
