From 205b4c41b80b0b0ca995ea6a4dbd07757b609f8b Mon Sep 17 00:00:00 2001 From: Xavier Noria Date: Sun, 17 Jan 2010 00:33:24 +0100 Subject: AS guide: documents Class#reachable? --- .../source/active_support_core_extensions.textile | 25 ++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'railties/guides/source/active_support_core_extensions.textile') diff --git a/railties/guides/source/active_support_core_extensions.textile b/railties/guides/source/active_support_core_extensions.textile index c911cb9c9f..a0b29dc30b 100644 --- a/railties/guides/source/active_support_core_extensions.textile +++ b/railties/guides/source/active_support_core_extensions.textile @@ -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+: + + +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 + + +NOTE: Defined in +active_support/core_ext/class/removal.rb+. + h3. Extensions to +String+ h4. +squish+ -- cgit v1.2.3