diff options
author | matz <matz@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2006-07-31 06:31:38 +0000 |
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committer | matz <matz@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2006-07-31 06:31:38 +0000 |
commit | 4c86e4a580fc172b0f524a371c133d6d990022d0 (patch) | |
tree | 9ea49b57c1045fa5e5e912cd8f03a2e3d722db83 /lib/weakref.rb | |
parent | ddc38a6abbd94df58a99c6aff43e4ab71a7132a2 (diff) |
* lib/logger.rb: improves the amount of documentation that Rdoc
picks up when processing logger.rb by moving the require
statement back before the comment block. a patch from Hugh
Sasse <hgs at dmu.ac.uk>. [ruby-core:08422]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@10647 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'lib/weakref.rb')
-rw-r--r-- | lib/weakref.rb | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/lib/weakref.rb b/lib/weakref.rb index a398ebf1fe..bc1b916619 100644 --- a/lib/weakref.rb +++ b/lib/weakref.rb @@ -1,4 +1,11 @@ -# Weak Reference class that does not bother GCing. + +require "delegate" + +# Weak Reference class that does not bother GCing. This allows the +# referenced object to be garbage collected as if nothing else is +# referring to it. Because Weakref inherits from Delegator it passes +# method calls to the object from which it was constructed, so it +# is of the same Duck Type. # # Usage: # foo = Object.new @@ -8,11 +15,9 @@ # p foo.to_s # should be same class # ObjectSpace.garbage_collect # p foo.to_s # should raise exception (recycled) - -require "delegate" - class WeakRef<Delegator + # RefError is raised if an object cannot be referenced by a WeakRef. class RefError<StandardError end @@ -41,6 +46,7 @@ class WeakRef<Delegator end } + # Create a new WeakRef from +orig+. def initialize(orig) @__id = orig.object_id printf "orig: %p\n", @__id @@ -58,6 +64,9 @@ class WeakRef<Delegator super end + # Return the object this WeakRef references. Raise + # RefError if this is impossible. The object is that + # to which method calls are delegated (see Delegator). def __getobj__ unless @@id_rev_map[self.object_id] == @__id Kernel::raise RefError, "Illegal Reference - probably recycled", Kernel::caller(2) @@ -71,6 +80,7 @@ class WeakRef<Delegator def __setobj__(obj) end + # Determine if this Weakref still refers to anything. def weakref_alive? @@id_rev_map[self.object_id] == @__id end |