JIT Inheritance

19/11/2015 - 21:37 von Lou Henry Alvarez | Report spam
This flavor of the inheritance model allows our modular closures to have similar properties to the inheritance of classes. With it you can expect to have access to its super members as part of the call, just like you would with classes. In addition to the inheritance resulting from versioning, JIT inheritance presents a more complete scenario adding color to the picture painted by code injectors. The key takeaway here is this: Code Injectors are mix-ins that share a similar inheritance model with classes. You can version them to gain access to versioned inheritance or you can override its members to access an ancestor chain comprised of all previous tags. As always we will use some example code to illustrate:

#
# Our Modular Closure
#
Tag1 = jack :Tagger do
def m1
1
end

def m2
:m2
end
end

#
# Normal Versioned Injector inheritance
#
Tagger do
def other
'other' # -- same ancestors as before
end
end

expect(Tagger().ancestors).to eql( [Tagger()] )

# test it

o = Object.new.extend(Tagger())

# inherited
o.m1.should == 1
o.m2.should == :m2

# current
o.other.should == 'other'


#
# JIT inheritance
#
Tag2 = Tagger do
def m1 # The :m1 override invokes JIT inheritance
super + 1 # -- Tag1 is summoned into ancestor chain
end # -- allows the use of super

def m3
'em3'
end
end

# test it

p = Object.new.extend(Tag2)

# JIT inherited
p.m1.should == 2

# regular inheritance
p.m2.should == :m2
p.m3.should == 'em3'
p.other.should == 'other'

expect(Tagger().ancestors).to eql( [Tagger(), Tag1] )
expect(Tag2.ancestors).to eql( [Tag2, Tag1] )


For more please visit: http://jackbox.us


Thanks again,

Lou
 

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#1 Robert Klemme
30/11/2015 - 18:30 | Warnen spam
On Thursday, November 19, 2015 at 9:37:40 PM UTC+1, Lou Henry Alvarez wrote:
This flavor of the inheritance model allows our modular closures to have similar properties to the inheritance of classes. ...



The language in this group is German - "man spricht Deutsch".

robert

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