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Bug #16467
closed
Fetching a class variable with instance_eval fails with NameError
Bug #16467: Fetching a class variable with instance_eval fails with NameError
Status:
Rejected
Assignee:
-
Target version:
-
ruby -v:
ruby 2.7.0p0 (2019-12-25 revision 647ee6f091) [x86_64-darwin18]
Backport:
Description
Trying to fetch a class variable using instance_eval fails with uninitialized class variable @variable_name in Object (NameError).
Reproduction program:
class FooClass def initialize @foo = "foo" @@bar = "bar" end def get_bar @@bar end end foo = FooClass.new puts foo.instance_eval("@foo") # prints "foo" puts foo.get_bar # prints "bar" puts foo.instance_eval("@@bar") # raises uninitialized class variable @@bar in Object (NameError) 
Updated by nobu (Nobuyoshi Nakada) almost 6 years ago
- Status changed from Open to Rejected
Class variables need to be in the proper class context.
The following code raises a NameError too.
class FooClass::BarClass @@bar # NameError (uninitialized class variable @@bar in FooClass::BarClass) end You have to use class_eval.
foo.class.class_eval("@@bar") # or FooClass.class_eval("@@bar") Actions