Sha256: cd13d197bfbbd2689205ee5397389a8ea14819cae7f5239b4e1da42291b3f040
Contents?: true
Size: 1.37 KB
Versions: 25
Compression:
Stored size: 1.37 KB
Contents
module BuildTool
class Singleton
def self.inherited( child )
if child.superclass == Singleton
child.class_eval <<-EOS
def self.instance; instance_variable_get( "@instance" ); end
def self.instance=( x ); instance_variable_set( "@instance", x ); end
EOS
else
child.class_eval <<-EOS
def self.instance; superclass.instance; end
def self.instance=( x ); superclass.instance = x; end
EOS
end
child.instance_variable_set( "@instance", nil )
end
def initialize
if !self.class.instance.nil?
raise StandardError, "More than one instance of #{self.class} created!"
end
self.class.instance = self
end
def self.instance
raise StandardError, "No instance of #{self} created"
end
def destroy
cls = self.class
while cls.superclass != Singleton
cls = cls.superclass
end
cls.instance = nil
end
def instance
cls = self.class
while cls.superclass != Singleton
cls = cls.superclass
end
cls.instance
end
end
end # module BuildTool
Version data entries
25 entries across 25 versions & 1 rubygems