Ruby public, protected, private calls

test.rb

class A
  public
  def pub_test
    puts "A::pub_test"
    print " ->"
    prot_test
    print " ->"
    priv_test
  end

  def child_calls
    puts " === Calls from A on B"
    b = B.new
    b.pub_test
    b.prot_test rescue puts "b.prot failed"
    b.priv_test rescue puts "b.priv failed"
  end

  protected
  def prot_test
    puts "A::prot_test"
  end
  
  private
  def priv_test
    puts "A::priv_test"
  end
end

class B < A
  public
  def pub_test
    puts "B::pub_test"
    print " ->"
    super
    print " +>"
    prot_test
    print " +>"
    priv_test
  end
end

class C < A
  public
  def priv_test
    puts " == super in priv"
    super
    print " ->"
    prot_test
  end
end

b = B.new
b.pub_test
b.prot_test rescue puts "b.prot failed"
b.priv_test rescue puts "b.priv failed"

a = A.new
a.child_calls

c = C.new
c.priv_test

### Output
# B::pub_test
#  ->A::pub_test
#  ->A::prot_test
#  ->A::priv_test
#  +>A::prot_test
#  +>A::priv_test
# b.prot failed
# b.priv failed
#  === Calls from A on B
# B::pub_test
#  ->A::pub_test
#  ->A::prot_test
#  ->A::priv_test
#  +>A::prot_test
#  +>A::priv_test
# A::prot_test
# b.priv failed
#  == super in priv
# A::priv_test
#  ->A::prot_test
###