From: Tanaka Akira <akr@...17n.org>
Date: 2002-07-27T02:47:29+09:00
Subject: [ruby-dev:17846] Re: new mathn [Re: Rational#to_int ← String#center]

In article <200207261056.TAA02094.keiju@ishitsuka.com>,
  keiju@rational.com ($B@PDM7=<y(B) writes:

> $B%m!<%+%kJQ?t$rMQ$$$kJ}K!$O(B, ScopeStak$B$NF,$N>uBV8BDj%9%3!<%W$rMQ$$$k$N(B
> $B$G$O$J$/(B, $B$=$N%m!<%+%kJQ?t$KEPO?$5$l$?>uBV8BDj%9%3!<%W$rMQ$$$l$PNI$$$s(B
> $B$8$c$J$$$+(B? $B$C$F$3$H$@$H;W$&$N$G$9$,(B, $B>uBV0MB8%a%=%C%IFb$+$i$=$NJQ?t$r(B
> $B%"%/%;%9$G$-$^$;$s$N$GIT2DG=$G$9(B.

% ruby -e '
def set(val, &b)
  Thread.current[:__scope_in_state_scope_stack] = val
  eval("__scope_in_state_scope_stack = Thread.current[:__scope_in_state_scope_stack]", b)
  Thread.current[:__scope_in_state_scope_stack] = nil
end
def get(&b)
  eval("if defined? __scope_in_state_scope_stack then __scope_in_state_scope_stack else nil end", b)
end

p get {}
set(1) {}
p get {}
set(2) {}
p get {}
p eval("__scope_in_state_scope_stack")
'
nil
1
2
2

$B$H$$$&$h$&$J$b$N$rA[Dj$7$F$$$^$9!#(B

> # $B:#OCBj$K$J$C$F$$$k(Bbinding$B$N%9%?%C%/$r8+$l$l$PJL$+$bCN$l$^$;$s$,(B...

$B$o$?$7$O!"IT2DG=$G$O$J$$!"$HH=CG$7$F$^$9!#$+$J$j6$0-$G$9$,!#(B
-- 
[$BEDCf(B $BE/(B][$B$?$J$+(B $B$"$-$i(B][Tanaka Akira]
$B!V$U$($m(B! $B$o$+$a$A$c$s:n@o$G$9$(C"=$B!W(B(Little Worker, $B7KM7@84](B)