class
BitStruct
def
self.list(name,element) module_eval
<<-
HERE rest :body
def
#
{name.to_s}=(elist)
e
=
Object.const_get(:
#
{element})
if
elist.respond_to? :each
and
elist.respond_to? :[]
and
elist[0].is_a? e elist.each{
|
value
|
self.body
+=
value} elsif elist.is_a? e self.body
=
elist
else
raise
ArgumentError,elist.to_s
<<
"
is not a #{element}
"
,caller end end
def
#
{name.to_s}
result
=
[] e
=
Object.const_get(:
#
{element})
size
=
e.new.size num
=
self.body.size
/
size
-
1
for
i
in
0..num result[i]
=
e.new(self.body[i
*
size,size]) end result end HERE end end利用Ruby的动态特性，很容易就达到了，使用的话：
class
A
<
BitStruct unsigned :id,
32
end
class
B
<
BitStruct list :aList,A end alist
=
[]
for
i
in
0..
10
a
=
A.new a.id
=
i alist.unshift a end b
=
B.new b.aList
=
alist b.aList.each{
|
e
|
puts e.id}
文章转自庄周梦蝶 ，原文发布时间 2008-01-27
