Array#dup$B$,$*$+$7$$(B?

Ruby Development
1

e$B$3$s$K$A$O;3K$H$b$&$7$^$9!#e(B

trunke$B$Ne(Brubye$B$r;n$7$F$?$s$G$9$,e(BArray#dupe$B$,$*$+$7$$$h$&$G$9!#e(B

./miniruby -e ‘p ([0,1][0,1]).dup’
#[0, 1]e$B$HI=<($5$l$ke(B

e$B0J2<$N$h$&$K$7$F$bF1$8$G$7$?!#e(B

a = [0,1]
p a[0,1] #[0]e$B$HI=<($5$l$ke(B
p a[0,1].dup #[0, 1]e$B$HI=<($5$l$ke(B

e$B4D6-$Oe(B

ruby 1.9.0 (2007-01-09 patchlevel 0) [i686-linux]

e$B$G$9!#e(B

2

e$B$J$+$@$G$9!#e(B

At Tue, 9 Jan 2007 17:41:05 +0900,
madoka yamamoto wrote in [ruby-dev:30116]:

trunke$B$Ne(Brubye$B$r;n$7$F$?$s$G$9$,e(BArray#dupe$B$,$*$+$7$$$h$&$G$9!#e(B

./miniruby -e ‘p ([0,1][0,1]).dup’
#[0, 1]e$B$HI=<($5$l$ke(B

lfreee$B$re(Breverte$B$7$?$H$-$N%_%9$G$7$g$&$+!#e(B

Index: array.c

— array.c (revision 11516)
+++ array.c (working copy)
@@ -2091,13 +2091,15 @@ rb_ary_replace(VALUE copy, VALUE orig)
VALUE *ptr;

  • rb_ary_modify(copy);
  • ary_iter_check(copy);
    orig = to_ary(orig);
  • rb_ary_modify_check(copy);
  • ary_iter_check(copy);
    if (copy == orig) return copy;
    shared = ary_make_shared(orig);
  • ptr = RARRAY(copy)->ptr;
  • if (!ARY_SHARED_P(copy)) {
  • ptr = RARRAY(copy)->ptr;
    xfree(ptr);
  • RARRAY(copy)->ptr = RARRAY(shared)->ptr;
  • RARRAY(copy)->len = RARRAY(shared)->len;
  • }
  • RARRAY(copy)->ptr = RARRAY(orig)->ptr;
  • RARRAY(copy)->len = RARRAY(orig)->len;
    RARRAY(copy)->aux.shared = shared;
    FL_SET(copy, ELTS_SHARED);
3

e$B$^$D$b$He(B e$B$f$-$R$m$G$9e(B

In message “Re: [ruby-dev:30117] Re: Array#dupe$B$,$*$+$7$$e(B?”
on Tue, 9 Jan 2007 19:02:10 +0900, “Nobuyoshi N.”
[email protected] writes:

|At Tue, 9 Jan 2007 17:41:05 +0900,
|madoka yamamoto wrote in [ruby-dev:30116]:
|> trunke$B$Ne(Brubye$B$r;n$7$F$?$s$G$9$,e(BArray#dupe$B$,$*$+$7$$$h$&$G$9!#e(B
|>
|> ./miniruby -e ‘p ([0,1][0,1]).dup’
|> #[0, 1]e$B$HI=<($5$l$ke(B
|
|lfreee$B$re(Breverte$B$7$?$H$-$N%_%9$G$7$g$&$+!#e(B

e$B$I$&$b$=$N$h$&$G$9$M!#e(Btrunke$B$K%3%_%C%H$7$F$$$?$@$1$^$;$s$+!)e(B