First is, does Ruby have anything equivalent to C++‘s `this’ pointer?
I’ve tried the docs, but don’t know what to look for other than ‘this’…
Second, if I were to write a method that accepts a block, and would like
to be able to recurse in that method while allowing each of the recursions
to use the same block, how would I do that?
As an example, suppose I have a tree data structure (below), such that
each node has two children: a and b. I want to create an each'' method. Ideally, I would yield withthis,’’ and then would recurse to ``each’'
on every child of that node.
this doesnt work for so many reasons
class Node
def initialize(me,a,b) @me = me @a = a @b = b
end
def each
# @this represents the calling object (see 1st question)
yield @this
# ideally, the same block would get passed to each of
# these sub calls
@aB.each
@b.each
end
First is, does Ruby have anything equivalent to C++‘s `this’ pointer?
I’ve tried the docs, but don’t know what to look for other than ‘this’…
Aye. You’re looking for the ‘self’. eg:
irb(main):001:0> self
=> main
Second, if I were to write a method that accepts a block, and would like
to be able to recurse in that method while allowing each of the recursions
to use the same block, how would I do that?
def a_method(arg, &block)
if arg > 10
a_method(arg.succ, &block)
end
end
As an example, suppose I have a tree data structure (below), such that
each node has two children: a and b. I want to create an each'' method. Ideally, I would yield with this,‘’ and then would recurse to ``each’’
on every child of that node.
class Node
def initialize(left, right) @left = left @right = @right
end
def each(&block)
block.call(self)
@left.each(&block) if @left
@right.each(&block) if @left
end
end
···
On Sun, Apr 04, 2004 at 05:58:04PM +0900, Nicholas Paul Johnson wrote:
