Re: [MacRuby-devel] re-implemention of attr_accessor and valueForKey:

11 Mar 2011

      Hi,

Thanks for ticket and simplify the code.
For a while I'll use class_eval to define a method which require KVC compliant.

2011/3/11 Thibault Martin-Lagardette <thibault.ml@gmail.com>:
...
Hi,
After fiddling a little bit with the code, I could not find the exact issue,
but could reduce the code a lot.
For the sake of it, I opened a Trac ticket with the reduced
code: https://www.macruby.org/trac/ticket/1188
Cheers,
--
Thibault Martin-Lagardette
On Thursday, March 10, 2011 at 13:59, kyossi wrote:
Hi,
I'm plan to add some functionality to existing attr_accessor.
I've started with re-implement attr_accessor with same functionality,
but when I implement it by define_method, it failed with Segmentation
fault when I call valueForKey(:key).
Am i doing wrong with class Base2??,
The Code is
#utility
class String
#upcase first char. "foo".upcaseFirstChar => "Foo"
def upcaseFirstChar
self[0].upcase + self[-self.size+1, self.size-1]
end
end
#implement of my_attr_accessor with evaluate string. works fine
class Base
def self.my_attr_accessor(sym)
class_eval %{
def #{sym}
@#{sym}
end
def set#{sym.to_s.upcaseFirstChar}(val)
@#{sym} = val
end
}}
end
end
class MyClass < Base
my_attr_accessor :foo
end
obj = MyClass.new
obj.setFoo(3)
p obj.foo #=>3
p obj.valueForKey(:foo) #=>3
#another implement of my_attr_accessor
class Base2
def self.my_attr_accessor(sym)
define_method(sym) do
instance__variable_get("@#{sym}")
end
define_method("set#{sym.to_s.upcaseFirstChar}") do |val|
instance_variable_set("@#{sym}", val)
end
end
end
class MyClass2 < Base2
my_attr_accessor :foo
end
obj2 = MyClass2.new
obj2.setFoo(7)
p obj2.foo #=>7
p obj2.valueForKey(:foo) #=> Segmentation fault
=====================
$ macruby my_attr_accessor.rb
3
3
7
Segmentation fault
_______________________________________________
MacRuby-devel mailing list
MacRuby-devel@lists.macosforge.org
http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel
_______________________________________________
MacRuby-devel mailing list
MacRuby-devel@lists.macosforge.org
http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel