From: "Schüle Daniel" <uval@...>
Date: 2006-07-30T22:15:08+09:00
Subject: mimic File.open pattern

Hello all,

open is singleton method of File and can be used in two ways

# 1 way
f = File.open("data")
f.readline until f.lineno == 10
puts f.readline
f.close

# 2 way
File.open("data") do |f|
	f.readline until f.lineno == 10
	puts f.readline
end

I am trying to mimic this with my own classes

irb(main):001:0> class Resource
irb(main):002:1> @@cnt=0
irb(main):003:1> def initialize
irb(main):004:2> @id =  @@cnt
irb(main):005:2> @@cnt += 1
irb(main):006:2> end
irb(main):007:1> def id;@id;end
irb(main):008:1> end
=> nil
irb(main):009:0> class Q
irb(main):010:1> def Q.get &block
irb(main):011:2> r = Resource.new
irb(main):012:2> if Kernel::block_given?
irb(main):013:3> block.call(r)
irb(main):014:3> else
irb(main):015:3* return r
irb(main):016:3> end
irb(main):017:2> end
irb(main):018:1> end
=> nil
irb(main):019:0> Q.get
=> #<Resource:0x40206fe0 @id=0>
irb(main):020:0> Q.get {|r| puts r.id}
1
=> nil
irb(main):021:0>


I am interested in further suggestions
is my implementation close to that of File.open?

Regards, Daniel