Managing metadata about attribute types

[KUSUNOSE Toru]

Hi,

If I wanted a relevant subset of String, would that be better (i.e.
safer/faster) represented by a class/module representing that subset or
just one or a combination of respond_to?. I would argue most of the
time, that it is the former.

Sometimes, the latter is better.

For example, think Tempfile class. An instance of Tempfile
class responds to every methods an instace of the File class has,
so surely its type is File. But tmpfile.is_a? File is false.

That is, StrongTyping does not work well with the Delegator
pattern.

 

[Thien Vuong]

Sometimes, the latter is better.

Definitely. I could see much good use of it.
Just only wanted to point out that it is not always one way or another.

For example, think Tempfile class. An instance of Tempfile
class responds to every methods an instace of the File class has,
so surely its type is File. But tmpfile.is_a? File is false.

Thanks for pointing it out. I wonder if I have some code needs to check
if it has a file behaviour or not (say the stream behavior plus about
10 differrent methods), how could I do it concisely? I could structure
the application such that it is not necessary, but it is not always
possible nor desirable to do so.