📅  最后修改于: 2022-03-11 15:04:47.160000             🧑  作者: Mango
:: is basically a namespace resolution operator. It allows you to access items in modules, or class-level items in classes. For example, say you had this setup:
module SomeModule
module InnerModule
class MyClass
CONSTANT = 4
end
end
end
You could access CONSTANT from outside the module as SomeModule::InnerModule::MyClass::CONSTANT.
It doesn't affect instance methods defined on a class, since you access those with a different syntax (the dot .).
Relevant note: If you want to go back to the top-level namespace, do this: ::SomeModule –