# File lib/rack/flash.rb, line 39
      def initialize(store, opts={})
        raise Rack::Flash::SessionUnavailable \
          .new('Rack::Flash depends on session middleware.') unless store

        @opts = opts
        @store = store

        if accessors = @opts[:accessorize]
          accessors.each { |opt| def_accessor(opt) }
        end
      end