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* doc/syntax/refinements.rdoc: add description of Module#using and

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refinement inheritance by module inclusion.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41746 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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shugo 2013-07-02 08:24:26 +00:00
parent 58919a4da9
commit 9487404c62
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doc/syntax/refinements.rdoc
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@ -48,7 +48,7 @@ Activate the refinement with #using:
== Scope
You may only activate refinements at top-level to the end of the file or in a
You may activate refinements at top-level to the end of the file or in a
string passed to Kernel#eval, Kernel#instance_eval or Kernel#module_eval until
the end of the string.
@ -186,6 +186,25 @@ called:
p [{1=>2}, {3=>4}].to_json # prints "[{\"1\":2},{\"3\":4}]"
You may also activate refinements in a class or module definition, in which
case the refinements are activated from the point where using is called to
the end of the class or module definition:
# not activated here
class Foo
# not activated here
using M
# activated here
def foo
# activated here
end
# activated here
end
# not activated here
Note that the refinements in M are not activated automatically even if the class
Foo is reopened later.
== Method Lookup
When looking up a method for an instance of class +C+ Ruby checks:
@ -232,6 +251,12 @@ method lookup.
This behavior may be changed in the future.
== Refinements and module inclusion
Refinements are inherited by module inclusion. That is, using activates all
refinements in the ancestors of the specified module. Refinements in a
descendant have priority over refinements in an ancestor.
== Further Reading
See http://bugs.ruby-lang.org/projects/ruby-trunk/wiki/RefinementsSpec for the