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Re: Some ideas about c?

From Vassilis Spiliopoulos <vassilis@vask1lux.de>
Newsgroups comp.lang.c
Subject Re: Some ideas about c?
Date 2017-05-18 21:33 +0300
Organization freenews.netfront.net
Message-ID <ofkpec$1ap4$1@adenine.netfront.net> (permalink)
References (10 earlier) <20170518163000.fbb4cadaeb9ad188592f8b6b@gmail.com> <227ef14c-a886-4db5-ab56-885fbd920007@googlegroups.com> <ofkd7q$tji$1@dont-email.me> <2dc57c8f-02e6-4c74-81d9-51557ec6a5d1@googlegroups.com> <ofkfef$5qv$1@jstuckle.eternal-september.org>

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Jerry Stuckle <jstucklex@attglobal.net> Wrote in message:
> On 5/18/2017 11:15 AM, Malcolm McLean wrote:
>> On Thursday, May 18, 2017 at 4:09:00 PM UTC+1, Richard Heathfield wrote:
>>>
>>> Yes, but Destroy(p) is a NOP. That is, you haven't shown code for it, so 
>>> what are we to assume about it but that it's empty?
>>>
>> In C++ you normally use stl "containers" for non-scalar members, which
>> 95% of the time means std::vectors, but can also be things like unique_ptrs
>> if you need to build a graph. (The unique_ptr is like a C pointer which "owns"
>> a memory allocation). When the object's lifetime ends, it is automatically
>> destroyed. But the code is in the C++ standard library, you rarely have to
>> write a destructor by yourself.
>> 
>> In fact virtually all the complexity of C++ comes down to automatic destructors.
>> It's the one thing C can't imitate with a bit of different syntax and boilerplate
>> code.
>> 
> 
> This is one of the things I like about C++.  For instance, right now I'm
> using collection classes like std::vector.  This is a self-sizing array
> and elements can be accessed with standard array notation.  I'm also
> using std::map, which is like vector except the index can be anything -
> not just an integer.
> 
> Within them I have struct equivalents which contain string data.  String
> lengths can vary anywhere from a few characters (or a null string) to
> hundreds of characters - the strings are read in, so there's no
> predicting the length.  Rather than use char[2000] for every message and
> waste huge amounts of memory, in C I would dynamically allocate the
> lengths I need.
> 
> But then I have to ensure all of that is cleaned up when it is no longer
> needed.  This is exactly the type of operation which leads to memory
> leaks.  In C++, it's automatic.  If I delete an element of the vector or
> map, all memory associated with it is deleted automatically.  And if I
> delete the entire vector or map, all elements are deleted automatically.
> 
> Now all of this automated processing does have its downsides - it is
> slower than the equivalent in C.  The generated code is also larger.
> These two reasons alone make C a better solution in many instances than
> C++, and why I still write a fair amount of C code.  OTOH, the code is
> cleaner with fewer lines, and therefor less prone to errors.
> 
> But both languages have their advantages and disadvantages, and both
> languages have their uses.
> 
> -- 
> ==================
> Remove the "x" from my email address
> Jerry Stuckle
> jstucklex@attglobal.net
> ==================
> 

So ummm I should learn both and decide what is more useful?
-- 


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Thread

Some ideas about c? Vassilis Spiliopoulos <vassilis@vask1lux.de> - 2017-05-17 23:23 +0300
  Re: Some ideas about c? Ian Collins <ian-news@hotmail.com> - 2017-05-18 08:40 +1200
  Re: Some ideas about c? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-05-17 23:00 +0200
    Re: Some ideas about c? supercat@casperkitty.com - 2017-05-17 14:59 -0700
      Re: Some ideas about c? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-05-18 00:08 +0200
        Re: Some ideas about c? supercat@casperkitty.com - 2017-05-17 22:09 -0700
          Re: Some ideas about c? Ian Collins <ian-news@hotmail.com> - 2017-05-18 18:22 +1200
          Re: Some ideas about c? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-05-18 12:36 +0200
            Re: Some ideas about c? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-05-18 03:53 -0700
              Re: Some ideas about c? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-05-18 14:24 +0200
                Re: Some ideas about c? Jerry Stuckle <jstucklex@attglobal.net> - 2017-05-18 08:37 -0400
                Re: Some ideas about c? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-05-18 05:47 -0700
                Re: Some ideas about c? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-05-18 15:20 +0200
                Re: Some ideas about c? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-05-18 06:28 -0700
                Re: Some ideas about c? scott@slp53.sl.home (Scott Lurndal) - 2017-05-18 13:56 +0000
                Re: Some ideas about c? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-05-18 16:30 +0200
                Re: Some ideas about c? Thiago Adams <thiago.adams@gmail.com> - 2017-05-18 07:45 -0700
                Re: Some ideas about c? Richard Heathfield <rjh@cpax.org.uk> - 2017-05-18 16:08 +0100
                Re: Some ideas about c? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-05-18 08:15 -0700
                Re: Some ideas about c? Jerry Stuckle <jstucklex@attglobal.net> - 2017-05-18 11:46 -0400
                Re: Some ideas about c? Vassilis Spiliopoulos <vassilis@vask1lux.de> - 2017-05-18 21:33 +0300
                Re: Some ideas about c? Jerry Stuckle <jstucklex@attglobal.net> - 2017-05-18 15:29 -0400
                Re: Some ideas about c? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-05-19 01:23 +0200
                Re: Some ideas about c? Thiago Adams <thiago.adams@gmail.com> - 2017-05-18 18:12 -0700
                Re: Some ideas about c? Thiago Adams <thiago.adams@gmail.com> - 2017-05-18 10:08 -0700
                Re: Some ideas about c? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-05-19 00:39 +0200
                Re: Some ideas about c? Vassilis Spiliopoulos <vassilis@vask1lux.de> - 2017-05-19 14:27 +0300
                Re: Some ideas about c? David Brown <david.brown@hesbynett.no> - 2017-05-19 13:41 +0200
                Re: Some ideas about c? Richard Heathfield <rjh@cpax.org.uk> - 2017-05-19 13:04 +0100
                Re: Some ideas about c? Keith Thompson <kst-u@mib.org> - 2017-05-19 10:00 -0700
                Re: Some ideas about c? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-05-19 14:14 +0200
                Re: Some ideas about c? Jerry Stuckle <jstucklex@attglobal.net> - 2017-05-18 11:33 -0400
                Re: Some ideas about c? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-05-18 08:47 -0700
                Re: Some ideas about c? supercat@casperkitty.com - 2017-05-18 08:48 -0700
                Re: Some ideas about c? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-05-18 09:02 -0700
                Re: Some ideas about c? supercat@casperkitty.com - 2017-05-18 10:52 -0700
                Re: Some ideas about c? Jerry Stuckle <jstucklex@attglobal.net> - 2017-05-18 15:35 -0400
                Re: Some ideas about c? supercat@casperkitty.com - 2017-05-18 14:01 -0700
                Re: Some ideas about c? Jerry Stuckle <jstucklex@attglobal.net> - 2017-05-18 17:38 -0400
                Re: Some ideas about c? supercat@casperkitty.com - 2017-05-18 15:54 -0700
                Re: Some ideas about c? Jerry Stuckle <jstucklex@attglobal.net> - 2017-05-18 22:17 -0400
                Re: Some ideas about c? John Bode <jfbode1029@gmail.com> - 2017-05-18 08:06 -0700
                Re: Some ideas about c? John Bode <jfbode1029@gmail.com> - 2017-05-18 09:17 -0700
  Re: Some ideas about c? fir <profesor.fir@gmail.com> - 2017-05-17 14:34 -0700
    Re: Some ideas about c? Vassilis Spiliopoulos <vassilis@vask1lux.de> - 2017-05-18 16:16 +0300
  Re: Some ideas about c? Cholo Lennon <chololennon@hotmail.com> - 2017-05-18 10:26 -0300
  Re: Some ideas about c? John Bode <jfbode1029@gmail.com> - 2017-05-18 07:36 -0700
    Re: Some ideas about c? scott@slp53.sl.home (Scott Lurndal) - 2017-05-18 18:23 +0000
      Re: Some ideas about c? Gareth Owen <gwowen@gmail.com> - 2017-05-18 21:51 +0100
        Re: Some ideas about c? scott@slp53.sl.home (Scott Lurndal) - 2017-05-19 12:38 +0000
          Re: Some ideas about c? supercat@casperkitty.com - 2017-05-19 07:44 -0700
            Re: Some ideas about c? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-05-19 16:45 +0100
              Re: Some ideas about c? Tim Rentsch <txr@alumni.caltech.edu> - 2017-05-19 21:59 -0700
            Re: Some ideas about c? Keith Thompson <kst-u@mib.org> - 2017-05-19 10:06 -0700
              Re: Some ideas about c? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-05-19 18:18 +0100
                Re: Some ideas about c? Keith Thompson <kst-u@mib.org> - 2017-05-19 11:59 -0700
                Re: Some ideas about c? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-05-19 21:05 +0100
          Re: Some ideas about c? "James R. Kuyper" <jameskuyper@verizon.net> - 2017-05-19 12:42 -0400
            Re: Some ideas about c? Richard Heathfield <rjh@cpax.org.uk> - 2017-05-19 17:54 +0100
            Re: Some ideas about c? Gareth Owen <gwowen@gmail.com> - 2017-05-19 18:52 +0100
          Re: Some ideas about c? Gareth Owen <gwowen@gmail.com> - 2017-05-19 18:51 +0100
            Re: Some ideas about c? scott@slp53.sl.home (Scott Lurndal) - 2017-05-19 18:55 +0000
              Re: Some ideas about c? Gareth Owen <gwowen@gmail.com> - 2017-05-19 19:58 +0100
              Re: Some ideas about c? Keith Thompson <kst-u@mib.org> - 2017-05-19 12:12 -0700
            Re: Some ideas about c? Keith Thompson <kst-u@mib.org> - 2017-05-19 12:01 -0700
    Re: Some ideas about c? Ian Collins <ian-news@hotmail.com> - 2017-05-19 08:22 +1200
      Re: Some ideas about c? Gareth Owen <gwowen@gmail.com> - 2017-05-18 21:53 +0100
      Re: Some ideas about c? scott@slp53.sl.home (Scott Lurndal) - 2017-05-19 12:36 +0000
        Re: Some ideas about c? Gareth Owen <gwowen@gmail.com> - 2017-05-19 18:54 +0100
          Re: Some ideas about c? scott@slp53.sl.home (Scott Lurndal) - 2017-05-19 18:58 +0000
            Re: Some ideas about c? Keith Thompson <kst-u@mib.org> - 2017-05-19 12:18 -0700

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