From: matz@... (Yukihiro Matsumoto)
Date: 2002-06-25T17:35:23+09:00
Subject: Re: No exceptions from String#to_i

Hi,

In message "Re: No exceptions from String#to_i"
    on 02/06/25, Paul Brannan <pbrannan@atdesk.com> writes:

|Unfortunately, it's not possible to do this with user-defined data
|types.  If I have a String-like class with a to_i method that I want to
|return 0 on error, then I can do that, but then Integer() will also
|return 0 on error.  If I want Integer() to raise an exception on error,
|then to_i must also raise an exception on error.
|
|It's not good to have a standard library feature that user libraries
|cannot emulate.

How about Array(), Integer(), String() use to_ary, to_int, to_str
respectively [ruby-talk:43014], and Float() raises error if to_f
return NaN?

							matz.