Class_block

class One
  def initialize = ( @name = 'olle' )
end

one = One.new
puts one.name # => NoMethodError

# The class gives no way to access 'name'.

# (unless)
puts one.instance_variable_get('@name')

# adding getter-method to instance
one.class.send(:attr_reader, :name)
puts one.name # => olle

# ---
# You can also gain access to the namespace via a block.

class Two
  def initialize(&bl)
    @name = 'olle'
    instance_exec(&bl)
  end
end

Two.new { puts @name } # => olle