dup.cr

class Foo
  property x
  property y
  property z
  property w

  def initialize
  end

  def dup
    self_buf = pointerof(self) as UInt8*
    self_size = instance_sizeof(self)
    buf = Pointer(UInt8).malloc(self_size)
    # C.memcpy(buf as Void*, self_buf as Void*, self_size)
    buf.memcpy(self_buf, self_size)
    buf as self
  end

  def dup2
    f2 = Foo.new
    f2.x = x
    f2.y = y
    f2.z = z
    f2.w = w
    f2
  end

  def value
    x.to_i + y.to_i + z.to_i + w.to_i
  end
end

f = Foo.new
f.x = 1
f.y = 2
f.z = 3
f.w = 4

time = Time.now
a = 0
20_000_000.times do
  g = f.dup
  a += g.value
end
puts Time.now - time

time = Time.now
a = 0
20_000_000.times do
  g = f.dup2
  a += g.value
end
puts Time.now - time