From: Tanaka Akira <akr@...17n.org>
Date: 2001-12-27T20:05:31+09:00
Subject: [ruby-list:33045] Re: [][][] macro Ruby

In article <F112KtnHYz73SQ7MKLd0000cfa8@hotmail.com>,
  "=?iso-2022-jp?B?GyRCMGY+ZRsoQiAbJEI5QDBsGyhC?=" <kyoui32@hotmail.com> writes:

>  Ruby$B$K$O!"%^%/%m$N$h$&$JCV$-49$($,=PMh$?$iJXMx$+$J$H;W$$$^$7$?$,!"(B
> $B=OCN$7$F$*$j$^$;$s$N$G%9%^!<%H$J<jCJ$,$o$+$j$^$;$s!#(B
>   
>   foo[1][2][3]
>     
>   $BDj5A$9$k%a%=%C%I$O!"0J2<$N$H$*$j$G$9!#(B
>   def ?????????????
>     foo1(1,2) + foo2(3)
>   end
>   
>   $BMW$O!";H$&$H$-!J6&DL$NI=5-K!!K$O!"(B foo[1][2][3]$B$H$9$k$,(B
>   $B4{B8$N4X?t$NMxMQ$G!"=hM}$9$k$H$$$C$?>l9g$N%a%=%C%I$NDj5A$N;EJ}$,CN$j$?$$$G(B
> $B$9!#(B

$B$^$C$?$/$b$C$F$*4+$a$7$^$;$s$7!"(Bmacro $B$G$b$"$j$^$;$s$,!"2DG=$G$O$"$j$^$9!#(B

% ruby -e '
class A
  def [](a)
    Args.new(2) {|b, c| foo1(a,b) + foo2(c) }
  end
  def foo1(a,b)
    a + b
  end
  def foo2(c)
    c
  end
end

class Args
  def initialize(n, &block)
    @n = n
    @args = []
    @block = block
  end
  def [](a)
    @args << a
    @n -= 1
    if @n == 0
      @block.call(*@args)
    else
      self
    end
  end
end  
p A.new[1][2][3] 
'
6
-- 
[$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)