Re: inheritance example

[RLake@...]

> May I have an inheritance example please?

base = {}

function base._new(class, words)
  return setmetatable(words, {__index = class})
end

function base:new(...)
  return base._new(self, arg)
end
 
function base:punctuate()
  return table.concat(self, self.sep)
end

function base:stream()
  return table.concat(self, " ")
end

base.sep = ", "

----

dotty = base:new()
dotty.sep = ". "

---


-------- Sample:

U:\>lua
Lua 5.0  Copyright (C) 1994-2003 Tecgraf, PUC-Rio
> obj1 = base:new("Hello", "World")
> obj2 = dotty:new("Hello", "World")
> =obj1:punctuate()
Hello, World
> =obj2:punctuate()
Hello. World
> =obj1:stream()
Hello World
> =obj2:stream()
Hello World
>

------------

Some may object to the style; but it has served me reasonably well.

Note that a lot of identical metatables are created; memoising their 
creation would probably be a good idea.

Rici.