blob: f37898e7d7feace3ceab3291cc6c9e6c9a23a961 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
|
class Class
def attributes(*attrs)
@attributes = attrs
attr_reader *attrs
end
def deriving(*methods)
methods.each { |m| derive m }
end
def derive(method_name)
methods = {
:initialize => "
def #{method_name}(#{@attributes.join(',')})
#{@attributes.collect { |a| "@#{a} = #{a}" }.join("\n")}
end
",
:== => "
def ==(other)
#{name} === other &&
#{@attributes.collect { |a| "@#{a} == other.#{a}" }.join(" &&\n")}
end
"
}
class_eval methods[method_name], __FILE__, __LINE__
end
def hash_on(delegatee)
define_method :eql? do |other|
self == other
end
define_method :hash do
@hash ||= delegatee.hash
end
end
end
|
