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Re: Method that only one other class type may access

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On 10/ 4/11 09:49 AM, Jorgen Grahn wrote:
> On Mon, 2011-10-03, Ian Collins wrote:
>> On 10/ 2/11 09:32 AM, Christopher wrote:
>>> I know I need some sort of friend, but I don't want to friend the
>>> entire class.
>>>
>>> I've got a TcpConnection class and it has a state member.
>>> I've got a TcpListener class that accepts connections and creates a
>>> TcpConnectionClass.
>>>
>>> The TcpListener class needs to be able to change the state member of
>>> the TcpConnection class, but I don't want anyone else to be able to.
>>> How do I go about that?
>>
>> If a design doesn't fit the problem, the design is flawed.  It looks to
>> me like you are over engineering what is a very simple (and common)
>> task.  Don't fret though, I see this all the time!  Socket related
>> activities simply don't fit well within an OO approach.
>
> It is not clear to me what you mean with that last sentence, but I was
> going to say something similar:

Trying to use things like connection and listener classes!

> I see no great benefits of wrapping the BSD socket API in lots of stuff.
> If you wrap them a bit to get:
>
> - file descriptors which aren't convertible to and from ints
> - RAII
>
> then the API is pretty usable as it is. Bonus: anyone who knows the
> API doesn't have to relearn another one.

Agreed.

-- 
Ian Collins

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Method that only one other class type may access Christopher <cpisz@austin.rr.com> - 2011-10-01 13:32 -0700
  Re: Method that only one other class type may access Christopher <cpisz@austin.rr.com> - 2011-10-01 13:50 -0700
    Re: Method that only one other class type may access Noah Roberts <roberts.noah@gmail.com> - 2011-10-02 11:13 -0700
  Re: Method that only one other class type may access Marcel Müller <news.5.maazl@spamgourmet.com> - 2011-10-01 23:38 +0200
    Re: Method that only one other class type may access Christopher <cpisz@austin.rr.com> - 2011-10-01 15:34 -0700
      Re: Method that only one other class type may access Marcel Müller <news.5.maazl@spamgourmet.com> - 2011-10-02 15:27 +0200
  Re: Method that only one other class type may access Noah Roberts <roberts.noah@gmail.com> - 2011-10-02 11:06 -0700
  Re: Method that only one other class type may access Paul N <gw7rib@aol.com> - 2011-10-03 11:48 -0700
  Re: Method that only one other class type may access Ian Collins <ian-news@hotmail.com> - 2011-10-04 08:10 +1300
    Re: Method that only one other class type may access Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-10-03 20:49 +0000
      Re: Method that only one other class type may access Ian Collins <ian-news@hotmail.com> - 2011-10-04 15:01 +1300
        Re: Method that only one other class type may access Christopher <cpisz@austin.rr.com> - 2011-10-04 14:21 -0700
          Re: Method that only one other class type may access Ian Collins <ian-news@hotmail.com> - 2011-10-05 10:29 +1300
            Re: Method that only one other class type may access Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-10-05 08:19 +0000
              Re: Method that only one other class type may access Ian Collins <ian-news@hotmail.com> - 2011-10-05 21:39 +1300
                Re: Method that only one other class type may access Miles Bader <miles@gnu.org> - 2011-10-05 18:09 +0900
                Re: Method that only one other class type may access Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-10-05 18:30 +0000
  Re: Method that only one other class type may access Werner <werasm@gmail.com> - 2011-10-05 00:02 -0700

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