Ruby 中的 module_function 和 extend self异同（rubysmb error）居然可以这样


# test.rb
module MyModule
def public_meth
p “a public method, if the module is included to a class , can be call as object.public_meth”
end
def module_method
p “a module method,can be called as module_name.module_method. but can not be call as object.module_method”
end
private
def private_method_to_module_function
p “a private_method, but can be call as module_name.module_method, because it was assigned to module_function”
end
def private_method
p “I am a private method”
end
module_function :module_method, :private_method_to_module_function
end

MyModule.module_method
MyModule.private_method_to_module_function
begin
MyModule.public_meth
rescue
p “public method can not be called by module_name.public_meth”
end
begin
MyModule.private_method
rescue NoMethodError
p “private method can not be called by module_name.module_method”
end

class MyClass
include MyModule
end

obj=MyClass.new
obj.public_meth

begin
obj.private_method
rescue NoMethodError
p “private method in module can not be call by object.method_name”
end

begin
obj.module_method
rescue NoMethodError
p “module method can not be called by object.method_name, for object, module method is private instance method”
end

#调用
ruby test.rb
“a module method,can be called as module_name.module_method. but can not be call as object.module_method”
“a private_method, but can be call as module_name.module_method, because it was assigned to module_function”
“public method can not be called by module_name.public_meth”
“private method can not be called by module_name.module_method”
“a public method, if the module is included to a class , can be call as object.public_meth”
“private method in module can not be call by object.method_name”
“module method can not be called by object.method_name, for object, module method is private instance method”