Operator redefinition in YARV

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

e$B%a%bBe$o$j$G$9!#e(B

YARVe$B$G$O1i;;;R%a%=%C%I$N:FDj5A$K$^[email protected]~$7$F$$$J$$$N$G$9$M!#e(B
mathne$B$,F0$-$^$;$s!#e(B

e$BD>$=$&$H;W$C$?$1$I!"$I$3$G1i;;;R$rFCJL07$$$7$F$k$+$o$+$j$^$;e(B
e$B$s$G$7$?!#e(B

[email protected]$G$9!%e(B

Yukihiro M. wrote:

YARVe$B$G$O1i;;;R%a%=%C%I$N:FDj5A$K$^[email protected]~$7$F$$$J$$$N$G$9$M!#e(B
mathne$B$,F0$-$^$;$s!#e(B

e$B!!BP1~$7$F$$$^$9!%e(B

[Fixnum, Float, Bignum].each{|klass|
klass.class_eval{
[:+, :-, :/, :*].each{|op|
eval %{
def #{op}(a)
‘#{klass}##{op}’
end
}
}
}
}

b = 100 ** 100
p([1+2, 1-2, 1/2, 12])
p([1.1+2, 1.1-2, 1.1/2, 1.1
2])
p([b+b, b-b, b/b, b*b])
#=>
[“Fixnum#+”, “Fixnum#-”, “Fixnum#/”, “Fixnum#"]
[“Float#+”, “Float#-”, “Float#/”, "Float#
”]
[“Bignum#+”, “Bignum#-”, “Bignum#/”, “Bignum#*”]

e$B!!B?J,!$%P%0$,$"$k$H;W$&$s$G$9$,!$!J=PMh$l$P>.$5$$!K:F8=%W%m%0%i%`$r65$(e(B
[email protected]$1$^$;$s$+!%e(B

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

In message “Re: [ruby-dev:30745] Re: operator redefinition in YARV”
on Wed, 2 May 2007 10:55:43 +0900, SASADA Koichi [email protected]
writes:

|Yukihiro M. wrote:
|> YARVe$B$G$O1i;;;R%a%=%C%I$N:FDj5A$K$^[email protected]~$7$F$$$J$$$N$G$9$M!#e(B
|> mathne$B$,F0$-$^$;$s!#e(B
|
|e$B!!BP1~$7$F$$$^$9!%e(B

e$B$G$9$M$(!#%a!<%k=P$7$?D>8e$K<j85$G;w$?$h$&$J$3$H$r$7$?$i$A$ce(B
e$B$s$HF0$$$A$c$$$^$7$?!#$4$a$s$J$5$$!#e(B

|e$B!!B?J,!$%P%0$,$"$k$H;W$&$s$G$9$,!$!J=PMh$l$P>.$5$$!K:F8=%W%m%0%i%`$r65$(e(B
|[email protected]$1$^$;$s$+!%e(B

% ruby1.8 -r mathn -e ‘p (25/11)’
25/11
% ruby1.9 -r mathn -e ‘p (25/11)’
2

e$B$G$9!#e(Bmathne$B$,Bg$-$$$s$G$"$^$j>.$5$/$J$$:F8=%W%m%0%i%`$G$9$,!#e(B

[email protected]$G$9!%e(B

Yukihiro M. wrote:

% ruby1.8 -r mathn -e ‘p (25/11)’
25/11
% ruby1.9 -r mathn -e ‘p (25/11)’
2

e$B!!e(Bremove_method e$B$He(B alias
e$B$G:FDj5A%A%’%C%/$r$7$F$$$J$+$C$?$N$,860x$G$7e(B
e$B$?!%D>$7$^$7$?!%e(B

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