DelegateClass(superclass)
Instance Public methods
The primary interface to this library. Use to setup delegation when defining your class.
class MyClass < DelegateClass(ClassToDelegateTo) # Step 1
def initialize
super(obj_of_ClassToDelegateTo) # Step 2
end
end
Here's a sample of use from Tempfile which is really a File object with a few special rules about storage location and when the File should be deleted. That makes for an almost textbook perfect example of how to use delegation.
class Tempfile < DelegateClass(File)
# constant and class member data initialization...
def initialize(basename, tmpdir=Dir::tmpdir)
# build up file path/name in var tmpname...
@tmpfile = File.open(tmpname, File::RDWR|File::CREAT|File::EXCL, 0600)
# ...
super(@tmpfile)
# below this point, all methods of File are supported...
end
# ...
end
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