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AS guide: documents Class#reachable?

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Xavier Noria
2010-01-17 00:33:24 +01:00
parent 043e876676
commit 205b4c41b8
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railties/guides/source/active_support_core_extensions.textile
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@@ -703,6 +703,31 @@ See also +Object#remove_subclasses_of+ in "Extensions to All Objects FIX THIS LI
NOTE: Defined in +active_support/core_ext/class/removal.rb+.
h4. Reachable Classes
By definition a class is reachable if its name constantized is defined, and the corresponding constant evaluates to +self+:
<ruby>
class C; end
C.reachable? # => true
phantom = Object.send(:remove_const, :C)
# The class object is orphan now but it still has a name.
phantom.name # => "C"
# Class name no longer available as a constant.
phantom.reachable? # => nil
# Let's define a class named "C" again.
class C; end
# Class name available as a constant, but different class object.
phantom.reachable? # => false
</ruby>
NOTE: Defined in +active_support/core_ext/class/removal.rb+.
h3. Extensions to +String+
h4. +squish+