Re: C coding

And I thought RPGers were easily offended - good grief Erik - don't take it all so seriously.

I do not personally think that C is a good language for business applications which was the point of my remark. But mostly I was coming from the perspective of Bjarne Stroustrup's comment that "C makes it easy to shoot yourself in the foot; C++ makes it harder, but when you do it blows your whole leg off".


On 2014-02-13, at 6:37 PM, Erik Olsson <[email protected]> wrote:

> If someone thinks of C as mainly a vehichle to help you shooting yourself
> in the foot then you should probably go into some business. That is just
> ignorant and moronic. The language at number 1 for feb 2014 in the TIOBE
> index, really? Remind me, where is RPG IV again? I guess the leaders of
> North Korea think they are the centre of the universe too.
> 
> A word on portability. Well, on a 1-100 scale where 1 is most portable and
> 100 the least I guess RPG IV is around 100 whereas ANSI C is well in the
> top 10. And the ILE C version is not particularly portable. Just looking at
> the runtime reference for 6.1, it does not differentiate between C99 and
> C89 (snprintf for instance), it's all categorised as ANSI. How is that for
> portability? z/OS - another lovely IBM OS - for instance clearly let's the
> developer choose the C level (apart from the ISO date flag on strftime that
> is always available, guess that's a bug).
> 
> 
> 
> 
> 
> 
> On 13 February 2014 19:55, Marc Hunter <marc-G5HfMHItY0AlJZD/[email protected]> wrote:
> 
>> ouch.
>> 
>> Something you could try is defining the string parm in the RPG procedure
>> definition as follows:
>> 
>> D Parm * value options(*STRING)
>> 
>> Then in the C/C++ code you can do this:
>> 
>> extern "C" int DoSomething(char * szParm)
>> {
>> string myStringParm = szParm;
>> 
>> // move on into OOP world here...
>> 
>> It keeps the RPG relatively simple, and the char *'s are converted to
>> strings as early as possible. A few extra copies of the data, but in
>> most cases the simplicity is worth it (imo).
>> 
>> Marc
>> 
>> 
>> On 2/13/2014 9:43 AM, Tim Bronski wrote:
>>> Yes, but the statement was the attempt to create a c++ string from a
>>> parameter passed from....an RPG program!
>>> 
>>> On 2/13/2014 6:36 PM, Marc Hunter wrote:
>>>> While I empathize, and certainly C++ also allows you to shoot yourself
>>>> in the foot, the code shown is philosophically (imo) a mix of C and C++
>>>> in that it uses char *s. Assuming both variables are strings then I
>>>> would code it as follows and avoid dipping into 'dangerous' char *
>>>> territory.
>>>> 
>>>> partName.insert(0, userName.substr(start, len));
>>>> 
>>>> (If I'm understanding the objective correctly)
>>>> 
>>>> Marc
>>>> 
>>>> On 2/13/2014 9:02 AM, Tim Bronski wrote:
>>>>> On 2/13/2014 5:23 PM, Jon Paris wrote:
>>>>>> I would have said that C was brilliant if your aim was to shoot
>> yourself in the foot and C++ does a better job of protecting you.
>>>>> Hi Jon, I would have let that slide but I've just finished tracking
>> down
>>>>> a bug where c++ was using a different overloaded string function than
>>>>> the one intended. Here's what the statement should have been:
>>>>> partName.insert(0, &userName[start],  len);
>>>>> but instead it was
>>>>> partName.insert(0, userName[start],  len);
>>>>> 
>>>>> This compiles fine but the result was heinous...the c compiler would
>>>>> have caught that one.
>> 
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>> 
> -- 
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Jon Paris

www.partner400.com
www.SystemiDeveloper.com




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