def func(x)
    x += 1
end

a = 5
func(a)  #this should be something like func(ref a)
puts a   #should read '6'

a = func(a)

def func(x, bdg)
  eval "#{x} += 1", bdg
end

a = 5
func(:a, binding)
puts a # => 6

class Container
attr_accessor :value
 def initialize value
   @value = value
 end
end

def func(x)
  x.value += 1
end

a = Container.new(5)
func(a)
puts a.value

def func(x)
    x[0] += 1
end

a = [5]
func(a)  #this should be something like func(ref a)
puts a[0]   #should read '6'

fp = {}
def changeit(par)
  par[:abc] = 'cde'
end

changeit(fp)

p fp

{:abc=>"cde"}