Open3 should use extend self instead of module_function calls
Open3 should use
extend self instead of
module_function calls after defining each method.
module_function causes access issues when the
Open3 module is mixed into other class or module namespaces. Ie, the very method proxies I wish to use in my "mixee" class, get created as private because of
module_function in "open3.rb".
Updated by akr (Akira Tanaka) over 5 years ago
- Status changed from Open to Rejected
module_function is the standard way to define module methods.
I think it is because "include mod" makes us possible to call module methods without module name,
as "popen3(...)" instead of "Open3.popen3(...)",
"sin(...)" instead of "Math.sin(...)", etc.,
without providing the methods as public API.
"extend self" style makes applications which uses "include mod" will provide the methods as public API
which is not intentional in most cases.
(Most applications should not provide popen3() or sin() method as public API.)
If you really want it, you can invoke "public" method.
% ruby -e ' module M def m :m end module_function :m end class C include M end p C.new.m ' -e:11:in `<main>': private method `m' called for #<C:0x007f8b5fbd3d68> (NoMethodError) % ruby -e ' module M def m :m end extend self end class C include M end p C.new.m ' :m % ruby -e ' module M def m :m end module_function :m end class C include M public :m end p C.new.m ' :m