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= PropertyHash
The Property hash can be used an object in itself.
h = PropertyHash.new(:a=>1, :b=>2)
h[:a] #=> 1
h[:a] = 3
h[:a] #=> 3
Becuase the properties are fixed, if we try to set a key that is not present,
then we will get an error.
expect ArgumentError do
h[:x] = 5
end
The PropertyHash can also be used as a superclass.
class MyPropertyHash < PropertyHash
property :a, :default => 1
property :b, :default => 2
end
h = MyPropertyHash.new
h[:a] #=> 1
h[:a] = 3
h[:a] #=> 3
Again, if we try to set key that was not fixed, then we will get an error.
expect ArgumentError do
h[:x] = 5
end
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