[BUG] class variable

Hidetoshi_NAGAI · June 16, 2008, 7:12pm

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$ ruby19 -v
ruby 1.9.0 (2008-06-16 revision 0) [i686-linux]
$ ruby19
class A
@@VAR = 1
end
class A
def self.hoge
p @@VAR
end
end
class << A
def fuga
p @@VAR
end
end
A.hoge
A.fuga
1
-:11: warning: class variable access from toplevel
-:11:in fuga': uninitialized class variable @@VAR in Object (NameError) from -:15:in’

Hidetoshi_NAGAI · June 17, 2008, 1:44am

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Hidetoshi_NAGAI · June 17, 2008, 2:17am

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In message “Re: [ruby-dev:35135] Re: [BUG] class variable”
on Tue, 17 Jun 2008 08:43:31 +0900, SASADA Koichi [email protected]
writes:

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Hidetoshi_NAGAI · June 17, 2008, 4:30am

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Yukihiro M. wrote:

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Hidetoshi_NAGAI · June 17, 2008, 4:20am

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From: SASADA Koichi [email protected]
Subject: [ruby-dev:35135] Re: [BUG] class variable
Date: Tue, 17 Jun 2008 08:43:31 +0900
Message-ID: [email protected]

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Hidetoshi_NAGAI · June 17, 2008, 4:13pm

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Yukihiro M. wrote:

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Hidetoshi_NAGAI · June 17, 2008, 4:22pm

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In message “Re: [ruby-dev:35145] Re: [BUG] class variable”
on Tue, 17 Jun 2008 23:11:27 +0900, SASADA Koichi [email protected]
writes:

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Hidetoshi_NAGAI · June 17, 2008, 4:43pm

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Yukihiro M. wrote:

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Hidetoshi_NAGAI · June 17, 2008, 9:21am

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In message “Re: [ruby-dev:35139] Re: [BUG] class variable”
on Tue, 17 Jun 2008 11:28:42 +0900, SASADA Koichi [email protected]
writes:

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Hidetoshi_NAGAI · June 17, 2008, 6:19pm

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From: SASADA Koichi [email protected]
Subject: [ruby-dev:35147] Re: [BUG] class variable
Date: Tue, 17 Jun 2008 23:41:07 +0900
Message-ID: [email protected]

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class A
@iVAR=0
@@VAR = 1
def self.hoge; p @iVAR; p @@VAR; end
def A.fuga; p @iVAR; p @@VAR; end
end
class << A
def foo; p @iVAR; p @@VAR; end
end
def A.bar; p @iVAR; p @@VAR; end

e$B$Ne(B A.hoge, A.fuga, A.foo, A.bar
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A.foo e$B$Oe(B

irb(main):013:0> A.foo
0
(irb):8: warning: class variable access from toplevel
NameError: uninitialized class variable @@VAR in Object
from (irb):8:in `foo' from (irb):13 from /usr/local/bin/irb19:12:in` ’

e$B$G$9$7!$e(BA.bar e$B$Oe(B

irb(main):014:0> A.bar
0
NameError: uninitialized class variable @@VAR in Object
from (irb):10:in `bar' from (irb):14 from /usr/local/bin/irb19:12:in` ’

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Hidetoshi_NAGAI · June 21, 2008, 2:16am

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http://doc.loveruby.net/refm/api/view/spec/variables#class_var_scope

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class A
end

class B
@@v = 1
def A.hoge
@@v
end
end

p A.hoge #=> 1

On Wed, 18 Jun 2008 01:17:17 +0900

Hidetoshi_NAGAI · June 21, 2008, 10:30pm

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From: sheepman [email protected]
Subject: [ruby-dev:35190] Re: [BUG] class variable
Date: Sat, 21 Jun 2008 09:14:24 +0900
Message-ID: [email protected]

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e$B0J2<$N$h$&$K$J$k$H$$$&$3$H$G$9$h$M!%e(B

class A
@ivar = :class_A
@@cvar = :class_A
def A.m_A_A
p(:@ivar=>@ivar, :@@cvar=>@@cvar)
end
def A.set_var_A
@ivar = :mod_A_A
@@cvar = :mod_A_A
end
end
class B
@ivar = :class_B
@@cvar = :class_B
def A.m_B_A
p(:@ivar=>@ivar, :@@cvar=>@@cvar)
end
def A.set_var_B
@ivar = :mod_B_A
@@cvar = :mod_B_A
end
def B.vars
p(:@ivar=>@ivar, :@@cvar=>@@cvar)
end
end

A.m_A_A #=> {:@ivar=>:class_A, :@@cvar=>:class_A}
A.m_B_A #=> {:@ivar=>:class_A, :@@cvar=>:class_B}
B.vars #=> {:@ivar=>:class_B, :@@cvar=>:class_B}

A.set_var_A
A.m_A_A #=> {:@ivar=>:mod_A_A, :@@cvar=>:mod_A_A}
A.m_B_A #=> {:@ivar=>:mod_A_A, :@@cvar=>:class_B}
B.vars #=> {:@ivar=>:class_B, :@@cvar=>:class_B}

A.set_var_B
A.m_A_A #=> {:@ivar=>:mod_B_A, :@@cvar=>:mod_A_A}
A.m_B_A #=> {:@ivar=>:mod_B_A, :@@cvar=>:mod_B_A}
B.vars #=> {:@ivar=>:class_B, :@@cvar=>:mod_B_A}

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[BUG] class variable

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class A @iVAR=0 @@VAR = 1 def self.hoge; p @iVAR; p @@VAR; end def A.fuga; p @iVAR; p @@VAR; end end class << A def foo; p @iVAR; p @@VAR; end end def A.bar; p @iVAR; p @@VAR; end

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irb(main):013:0> A.foo 0 (irb):8: warning: class variable access from toplevel NameError: uninitialized class variable @@VAR in Object from (irb):8:in foo' from (irb):13 from /usr/local/bin/irb19:12:in ’

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irb(main):014:0> A.bar 0 NameError: uninitialized class variable @@VAR in Object from (irb):10:in bar' from (irb):14 from /usr/local/bin/irb19:12:in ’

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A.set_var_B A.m_A_A #=> {:@ivar=>:mod_B_A, :@@cvar=>:mod_A_A} A.m_B_A #=> {:@ivar=>:mod_B_A, :@@cvar=>:mod_B_A} B.vars #=> {:@ivar=>:class_B, :@@cvar=>:mod_B_A}

class A
@iVAR=0
@@VAR = 1
def self.hoge; p @iVAR; p @@VAR; end
def A.fuga; p @iVAR; p @@VAR; end
end
class << A
def foo; p @iVAR; p @@VAR; end
end
def A.bar; p @iVAR; p @@VAR; end

e$B$Ne(B A.hoge, A.fuga, A.foo, A.bar
e$B$OF1Ey$N%/%i%9%a%=%C%I$G$"$k$3$H$re(B
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e$B$rJV$9$b$N$N!$e(B
A.foo e$B$Oe(B

irb(main):013:0> A.foo
0
(irb):8: warning: class variable access from toplevel
NameError: uninitialized class variable @@VAR in Object
from (irb):8:in `foo' from (irb):13 from /usr/local/bin/irb19:12:in` ’

irb(main):014:0> A.bar
0
NameError: uninitialized class variable @@VAR in Object
from (irb):10:in `bar' from (irb):14 from /usr/local/bin/irb19:12:in` ’

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A.set_var_B
A.m_A_A #=> {:@ivar=>:mod_B_A, :@@cvar=>:mod_A_A}
A.m_B_A #=> {:@ivar=>:mod_B_A, :@@cvar=>:mod_B_A}
B.vars #=> {:@ivar=>:class_B, :@@cvar=>:mod_B_A}