OOP via VTables

benchOOP2.nim

import oopHelper, benchmark

declClass TBase:
  var 
    data: int
  proc create(data: int) {.constructor.} =
    self.data = data
  method Foo(): int = return self.data
  method Multi(a, b, c: int): int = 0
  proc initialize() {.inline.} =
    self.data = 10
  method Blah() =
    self.data = 3
    
declClass TSecond, TBase:
  var 
    d2: int
  method Foo(): int {.override.} = Inherited(self).Foo(self) +  self.d2
  method Multi(a, b, c: int): int {.override.} = a + b + c
  method Bar(): int = 0
  proc initialize() {.inline.} =
    initialize(super(self))
    self.d2 = 12

declClass TThird, TSecond:
  var 
    d3: int
  method Foo(): int {.override.} = self.d3
  method Bar(): int {.override.} = 3
  method Multi(a, b, c: int): int {.override.} = a + b + c + self.d3
  proc initialize() {.inline.} =
    initialize(super(self))
    self.d3 = 3

var o: TBase 
   
o = TThird.newInstance()
bench("TThird.multi"):
  var c = 0
  for i in 1..1_000_000_000:
    c = o.Multi(i, i-1, i-2)    
  echo c

o = TSecond.newInstance()
bench("TSecond.multi"):
  var c = 0
  for i in 1..1_000_000_000:
    c = o.Multi(i, i-1, i-2)    
  echo c

o = TBase.newInstance()
bench("TBase.multi"):
  var c = 0
  for i in 1..1_000_000_000:
    c = o.Multi(i, i-1, i-2)    
  echo c
    
o = TThird.newInstance()
bench("TThird.Foo"):
  var c = 0
  for i in 1..1_000_000_000:
    c = o.Foo()    
  echo c

bench("TThird create and Foo"):
  var c = 0
  for i in 1..10_000_000:
    o = TThird.newInstance()
    c = o.Foo()    
  echo c

o = TSecond.newInstance()
bench("TSecond.Foo"):
  var c = 0
  for i in 1..1_000_000_000:
    c = o.Foo()    
  echo c

o = TBase.newInstance()
bench("TBase.Foo"):
  var c = 0
  for i in 1..1_000_000_000:
    c = o.Foo()    
  echo c