[ruby-dev:48767] Rubyで静的型

=1B$B=3Di$a$^$7$F!#=1B(B
=1B$B:4!9LZ=3DSG7$H$$$&$b$N$G$9!#=1B(B

=1B$B$5$C$=3D$/K\Bj$G$9$,!"=1B(B
=1B$B7GBj$NDL$j!"=1B(BRuby=1B$B$N$h$&$JF0E*8@8l$G!"@EE*$J7?%A%'%C%/$r9T$&=
=1B(B
=1B$BJ}K!$K$D$$$F%"%$%G%"$r;}$C$F$$$^$9!#=1B(B
=1B$B$3$l$O;d$,CN$k8B$j!J$H$$$C$F$bBgJQ69$$HO0O$G$9$,!K$^$@@$$K=1B(B
=1B$B=3DP$F$$$J$$$h$&$J$N$G$9$,!"$3$l$r;H$&$H%@%C%/%?%$%T%s%0$r4^$a$?=1B(=
B
=1B$B$9$Y$F$NF0E*$J7?IU$1$r!"0l@Z$N7?;XDj$J$/!"@EE*$K9T$&$3$H$,=1B(B
=1B$B$G$-$^$9!#=1B(B

=1B$B$=3D$NJ}K!$O<!$G$9!#=1B(B
=1B$B#1!%4X?t$N0z?t$O$9$Y$F=1B(BC++=1B$B$G8@$&7?%F%s%W%l!<%H$H$9$k!#=1B(B=

=1B$B#2!%7??dO@$r9T$&!#=1B(B
=1B$B#3!%%]%j%b!<%U%#%:%`$O!V<+F0HF2=3D!W$7$F9T$&!#=1B(B

=1B$B<+F0HF2=3D!"$3$l$,;d$N%"%$%G%"$J$N$G$9$,!"$=3D$l$O=1B(BC++=1B$B$N2>A=
[4X?t=1B(B
=1B$B%F!<%V%k$r!"%/%i%9$4$H$G$J$/=1B(B
=1B$B%]%j%b!<%U%#%C%/$K?6Iq$&JQ?t$K$D$$$F$N0lO"$N8F$S=3DP$7$H!"$=3D$N=1B(=
B
=1B$BJQ?t$K<B:]$KF~$l$i$l$k%*%V%8%'%/%H$4$H$K:n$j!"<B9T;~!"JQ?t$,$I$N=1B(=
B
=1B$B%*%V%8%'%/%H$N7?$J$N$+$K$h$C$F!"2>A[4X?t%F!<%V%k$rA*$s$G!"$=3D$l$K=1B=
(B
=1B$B$D$$$F%*%V%8%'%/%H$N%a%s%P!<$r8F$S=3DP$9$H$$$&$b$N$G$9!#=1B(B

=1B$B$3$l$@$HJ,$+$j$K$/$$$H;W$$$^$9$,!"MW$OJQ?t$KF~$l$i$l$?!"F1$8%$%s%?!<=
=1B(B
=1B$B%U%'!<%9$rItJ,E*$K;}$D%*%V%8%'%/%H$N4X?t%F!<%V%k$N!"%a%b%j!<%^%C%T%s=
%0=1B(B
=1B$B$N:90[$r5[<}$9$k2>A[4X?t%F!<%V%k$r!"$=3D$NJQ?t$N$9$Y$F$N%]%j%b!<%U%#=
=1B(B
=1B$B%C%/$J8F$S=3DP$7$K$D$$$F!":n$k$H$$$&=1B(B
=1B$B$3$H$G$9!#$3$N2>A[4X?t%F!<%V%k$r!"=1B(BC++=1B$B$N$=3D$l$H6hJL$9$k$?$=
a!"0J2<$G$O=1B(B
=1B$B!V%-%c%C%W%F!<%V%k!W$H8F$V$3$H$K$7$^$9!#=1B(B

=1B$B$3$l$G$bJ,$+$j$K$/$$$N$GNc$r!#=1B(B
X=1B$B%*%V%8%'%/%H$,%a%s%P!<=1B(Ba, b, c, =
d=1B$B$r!"=1B(BY=1B$B%*%V%8%'%/%H$,%a%s%P!<=1B(Bb, c,=20
d, e=1B$B$r;}$A!"=1B(B

    if =1B$BF0E*$J>r7o=1B(B
        var =3D X
    else
        var =3D Y
    end
    var.b
    var.c

=1B$B$N%3!<%I$,$"$k$H$-!#=1B(B
var=1B$B$O%]%j%b!<%U%#%C%/$K?6Iq$$$^$9!#$=3D$NGX8e$G$O!"=1B(BX=1B$B$K$D$$=
$F$N%a%=3D%C%I=1B(B
b, =
c=1B$B$N;HMQ!J;HMQ$@$+$i=1B(Bd=1B$B$O4^$^$J$$!K$K$D$$$F$N%-%c%C%W%F!<%V%k=
$,=1B(B
=1B$BB8:_$7!"$=3D$l$,=1B(Bvar =3D =
x=1B$B$N$H$-=1B(Bvar=1B$B$KBeF~$5$l!"=1B(Bvar.b=1B$B$G%-%c%C%W%F!<%V%k$N=1B=
(B
=1B$B%a%s%P!<=1B(Bb=1B$B$,=1B(BX=1B$B%*%V%8%'%/%H$N%a%s%P!<=1B(Bb=1B$B$r;=
2>H$7$F!"=1B(BX=1B$B$N=1B(Bb=1B$B$r8F$S=3DP$7$^$9!#=1B(B
var =3D y=1B$B$N$H$-$bF1MM$G$9!#=1B(Bvar=1B$B$KF~$k=1B(BX, =
Y=1B$B$N%-%c%C%W%F!<%V%k$N%l%$%"%&%H=1B(B
=1B$B!J=1B(Bb, c=1B$B$N=3Dg!K$O=1B(BX, =
Y=1B$B6&$KF1$8$G!"$@$+$i$I$A$i$N!J<B9T;~J,$+$i$J$$!K=1B(B
=1B$B%-%c%C%W%F!<%V%k$N8F$S=3DP$7$K$b@EE*$KB+G{$G$-$^$9!#=1B(B
=1B$B%-%c%C%W%F!<%V%k$O$=3D$l$>$l6&DLE@$NL5$$=1B(BX, =
Y=1B$B$N%a%b%j!<%l%$%"%&%H=1B(B
=1B$B!J=1B(Bb, =
c=1B$B$K$D$$$F$N!K$X$N%]%$%s%?$r$=3D$N%a%s%P!<$H$7$F;}$A$^$9!#=1B(B
=1B$B$3$&$7$F%@%C%/%?%$%T%s%0$,@EE*7?B+G{$r$b$C$F$G$-$k$h$&$K$J$j$^$9!#=1B=
(B

=1B$B0J>e$,<+F0HF2=3D$N@bL@$G$9!#:Y$+$$$3$H$O$^$@$"$j$^$9$,!"BgBN$O=1B(B
=1B$B$3$s$J46$8$G$9!#=3DEMW!J$H;d$,;W$C$F$$$k!K$J$N$O!"$3$l$,7?@k8@$J$/=1B=
(B
=1B$B@EE*7?B+G{$9$k$?$a$KI,MW$J:G8e$NMWAG$H;W$o$l$k$3$H$G$9!#=1B(B
=1B$B$3$l$G=1B(BRuby=1B$B$G$b2?$i%3!<%I$rJQ99$9$k$3$H$J$/@EE*7?B+G{$,2DG=3D=
$H=1B(B
=1B$B$J$j$^$9!#=1B(BRuby=1B$B$bCY$$8@8l$+$i!"4hD%$l$P=1B(BC=1B$BJB$_$KB.$=
$8@8l$K$J$l=1B(B
=1B$B$k$+$b$7$l$^$;$s!#$=3D$&$J$k$H:#$^$GB.EY$,=3DEMW$JItJ,$O=1B(BC=1B$B$=
G=3Dq$3$&=1B(B
=1B$B$H$$$&$3$H$O$J$/$J$j!"5U$KB.EY$,=3DEMW$@$+$i$3$3$O=1B(BRuby=1B$B$G=3D=
q$3$&$H=1B(B
=1B$B$$$&$3$H$K$b$J$k$+$b$7$l$^$;$s!#=1B(B
=1B$B$b$C$H$b%3%s%Q%$%k$H$$$&<j=3Dg$,7y$o$l$l$P$=3D$l$^$G$G$9$,!#=1B(B

=1B$B0J>e!"$b$7$3$s$J$NEv$?$jA0$@$h!"$H$$$&$3$H$G$"$l$P?=3D$7Lu$"$j$^$;$s=
!#=1B(B
=1B$BD9J8<:Ni$7$^$7$?!#=1B(B

**************************
=1B$B:4!9LZ=3DSG7=1B(B
[e-mail]
**************************