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Re: a style question:

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Malcolm McLean wrote:
> On Monday, August 31, 2015 at 10:38:05 PM UTC+1, Bart wrote:
>> On 31/08/2015 21:51, Ian Collins wrote:
>>
>>> Do they?  Mine certainly don't.  Yes I have specialised numeric types
>>> and associative arrays (JSON types) in my libraries, but they can't be
>>> implemented without operator overloading.
>>
>> Numeric types are one of the very few examples where overloading might
>> actually be needed. But I don't think it's a common enough general
>> requirement.
>>
>> Associative arrays I don't know about; you mean just to overload "[]"? I
>> would also consider that rare enough that it can be done with function
>> calls. If you really need it with "[]", then it could be done partly
>> behind the scenes with my #pragma method. It keeps the main language
>> simple. /And/ stops people using such features inappropriately.
>>
> I've got a need for JSON in my program.
>
> So I've got a JParser class which you initialise with a JSON string,
> then you call getReal(), getInteger(), getString() or getObject()
> to query the structure. getObject() returns another JParser.
> There's also something for arrays.

Which is rather inelegant.

Manipulating JSON objects is an ideal use for operator overloading. 
Using operator[] to access sub-objects makes JSON manipulation much 
cleaner and mode like JSON in its home language, JavaScript.

> However that's only acceptable because our need is to get some JSON
> (actually from a third party library called Sciter), pull out
> known fields, then generate some JSON, almost always a fairly simple
> structure, to send back. We don't need to pass JSON objects
> about C++ functions and manipulate them.

Once something like JSON objects is made simple and the design makes 
them light weight to pass around, they are a convenient container for 
heterogeneous data.  If the interface is clunky, they won't find favour 
which is why I've not seen heterogeneous containers heavily used in C.

I use JSON for most of my inter-process communication (especially when 
the other end is a web page!), so the objects tend to propagate through 
the code.

-- 
Ian Collins

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a style question: G G <gdotone@gmail.com> - 2015-08-31 02:30 -0700
  Re: a style question: Ian Collins <ian-news@hotmail.com> - 2015-08-31 21:40 +1200
  Re: a style question: jt@toerring.de (Jens Thoms Toerring) - 2015-08-31 09:52 +0000
  Re: a style question: Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-08-31 03:24 -0700
    Re: a style question: Bartc <bc@freeuk.com> - 2015-08-31 11:50 +0100
      Re: a style question: Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-08-31 13:21 +0100
        Re: a style question: Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-08-31 05:41 -0700
        Re: a style question: Bartc <bc@freeuk.com> - 2015-08-31 14:55 +0100
          Re: a style question: Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-08-31 15:50 +0100
            Re: a style question: Bartc <bc@freeuk.com> - 2015-08-31 18:40 +0100
      Re: a style question: Melzzzzz <mel@zzzzz.com> - 2015-08-31 17:46 +0200
        Re: a style question: Bartc <bc@freeuk.com> - 2015-08-31 17:27 +0100
          Re: a style question: Melzzzzz <mel@zzzzz.com> - 2015-08-31 18:42 +0200
      Re: a style question: Jorgen Grahn <grahn+nntp@snipabacken.se> - 2015-08-31 17:41 +0000
        Re: a style question: Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-08-31 15:33 -0700
          Re: a style question: Jorgen Grahn <grahn+nntp@snipabacken.se> - 2015-09-01 08:34 +0000
      Re: a style question: Ian Collins <ian-news@hotmail.com> - 2015-09-01 07:40 +1200
        Re: a style question: Bartc <bc@freeuk.com> - 2015-08-31 21:36 +0100
          Re: a style question: Ian Collins <ian-news@hotmail.com> - 2015-09-01 08:51 +1200
            Re: a style question: Bartc <bc@freeuk.com> - 2015-08-31 22:37 +0100
              Re: a style question: Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-08-31 15:24 -0700
                Re: a style question: Ian Collins <ian-news@hotmail.com> - 2015-09-02 19:37 +1200
          Re: a style question: jt@toerring.de (Jens Thoms Toerring) - 2015-08-31 23:33 +0000
            Re: a style question: Bartc <bc@freeuk.com> - 2015-09-01 01:13 +0100
              Re: a style question: Ian Collins <ian-news@hotmail.com> - 2015-09-01 18:21 +1200
              Re: a style question: jt@toerring.de (Jens Thoms Toerring) - 2015-09-01 15:23 +0000
                Re: a style question: Bartc <bc@freeuk.com> - 2015-09-01 18:06 +0100
                Re: a style question: Jorgen Grahn <grahn+nntp@snipabacken.se> - 2015-09-01 20:39 +0000
                Re: a style question: jt@toerring.de (Jens Thoms Toerring) - 2015-09-01 20:45 +0000
                Re: a style question: Bartc <bc@freeuk.com> - 2015-09-01 22:53 +0100
            Re: a style question: Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-08-31 17:51 -0700

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