soft and program: comp.lang.c++ - 25 new messages in 14 topics

comp.lang.c++
http://groups.google.com/group/comp.lang.c++?hl=en

comp.lang.c++@googlegroups.com

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http://groups.google.com/group/comp.lang.c++/t/08adc6ce31d50518?hl=en

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==============================================================================
TOPIC: opinions on "Walls and Mirrors" ?
http://groups.google.com/group/comp.lang.c++/t/48e5157290f877dc?hl=en
==============================================================================

== 1 of 1 ==
Date: Fri, Jan 29 2010 1:39 am
From: Philip Potter

On 29/01/2010 00:39, red floyd wrote:
> On Jan 28, 9:21 am, Richard Herring <junk@[127.0.0.1]> wrote:
>> According to the Amazon link he posted, its title is
>>
>> "Data Abstraction and Problem Solving with C++: Walls and Mirrors (4th
>> Edition) (Hardcover)"
>>
>> which looks like C++ to me.
>>
>>
> I don't follow tinyurl links on usenet.

You can always see where they link before following:
http://preview.tinyurl.com/yzm7kja
^^^^^^^^ just add this

Phil

==============================================================================
TOPIC: isspace
http://groups.google.com/group/comp.lang.c++/t/89ca303518428e34?hl=en
==============================================================================

== 1 of 2 ==
Date: Fri, Jan 29 2010 2:09 am
From: gervaz

On 29 Gen, 09:09, Paavo Helde <myfirstn...@osa.pri.ee> wrote:
> gervaz <ger...@gmail.com> wrote in news:df9f84a1-a933-4063-bca5-
> f18c440b9...@l19g2000yqb.googlegroups.com:
>
>
>
> > On Jan 28, 11:46 pm, James Kanze <james.ka...@gmail.com> wrote:
> >> On 28 Jan, 21:25, gervaz <ger...@gmail.com> wrote:
>
> >> > On Jan 28, 9:40 pm, Paavo Helde <myfirstn...@osa.pri.ee> wrote:
> >> > > gervaz <ger...@gmail.com> wrote in news:198ffd0f-8a21-4d23-802f-
> >> > > cf0f0fee0...@o28g2000yqh.googlegroups.com:
> >> > > > Hi all, is there a C++ function similar to isspace that
> >> > > > can handle w_chars? Does the regex library handles
> >> > > > w_chars?
> >> > > Yes, there is a template function declared in <locale> and
> >> > > named std::isspace, curiously enough.
> >> > > There is no regex librar in the official C++ standard yet I
> >> > > think. The Boost regex library is fully templated and ought
> >> > > to support wchar_t as well, but I have not tried this.
> >> > > According to Boost documentation one needs a separate ICU
> >> > > library for full Unicode support though.
> >> > Well, take a look at my snippet:
> >> > std::ifstream infile(argv[1]);
> >> > std::string s;
> >> > while (getline(infile, s))
> >> > {
> >> > s.erase(std::remove_if(s.begin(), s.end(), std::isspace), s.end
> >> > ());
> >> > std::cout << s;
> >> > }
> >> > Using locale on VC++2008 I've got an error reporting that
> >> > std::isspace expects 2 arguments,
>
> >> That's because std::isspace requires two arguments, the
> >> character to be tested, and the locale.
>
> >> > and still I don't know if the file contains unicode characters
> >> > can be correctly handles.
>
> >> The functions in <locale> are pretty useless, since they only
> >> handle single byte characters. The "approved" solution is to
> >> read into a wstring using wifstream (embedded with the
> >> appropriate locale), and use isspace (again with the appropriate
> >> locale) on the wchar_t in the wstring.
>
> >> --
> >> James Kanze
>
> > Ok, well, suppose I want to use UTF-8 encoding, how do I specify it
>
> With UTF-8 one is using char, not wchar_t. Note that if char is a signed
> type, then one must take care to cast char to unsigned char in places
> where a non-negative value is expected.
>
> By historic reasons the locale and encoding stuff has been mixed up. Are
> you more interested in locales or in encodings? Locales affect such stuff
> as the character of representing the decimal point in numbers, look of
> the dates and whether V and W are sorted together or separately, and
> whether cyrillic characters are considered alphabetic characters or not.
> Encoding is a fully different business, specifying for example how those
> cyrillic characters are encoded in the binary data, if at all.
>
> If you just want to translate different encodings, then you do not need
> any locale stuff at all. When a web page comes in, you do not know if the
> decimal point used in numbers therein is a dot or a comma, for example,
> so strictly speaking you cannot set the correct locale for processing the
> page. What you can do is to look at BOM markers and charset encoding, and
> to translate the file from its charset to the encoding you are using
> internally, for example. For that, again no locales are needed, but
> instead one needs some kind os system-sepcific code or other library like
> iconv.
>
> > using locale? And where can I find a list of the possible locale
> > encoding configuration (e.g. if I wanted to correctly decode a web
> > page just parsing the fist bytes looking for 'charset')?
>
> http://www.iana.org/assignments/character-sets
>
> But you don't want to deal with this by yourself. Use a library like
> iconv.
>
> hth
> Paavo

Ok, so suppose I want to split a russian text into words and the base
method look at every character in order to decide if a space is found,
what do you suggest?

== 2 of 2 ==
Date: Fri, Jan 29 2010 10:12 am
From: Paavo Helde

gervaz <gervaz@gmail.com> wrote in
news:995e2805-ab97-4c11-ae49-fcce01682bb3@b9g2000yqd.googlegroups.com:

> On 29 Gen, 09:09, Paavo Helde <myfirstn...@osa.pri.ee> wrote:
>> gervaz <ger...@gmail.com> wrote in news:df9f84a1-a933-4063-bca5-
>> f18c440b9...@l19g2000yqb.googlegroups.com:
>>
>>
>>
>> > On Jan 28, 11:46 pm, James Kanze <james.ka...@gmail.com> wrote:
>> >> On 28 Jan, 21:25, gervaz <ger...@gmail.com> wrote:
>>
>> >> > On Jan 28, 9:40 pm, Paavo Helde <myfirstn...@osa.pri.ee> wrote:
>> >> > > gervaz <ger...@gmail.com> wrote in
>> >> > > news:198ffd0f-8a21-4d23-802f-
>> >> > > cf0f0fee0...@o28g2000yqh.googlegroups.com:
>> >> > > > Hi all, is there a C++ function similar to isspace that
>> >> > > > can handle w_chars? Does the regex library handles
>> >> > > > w_chars?
>> >> > > Yes, there is a template function declared in <locale> and
>> >> > > named std::isspace, curiously enough.
>> >> > > There is no regex librar in the official C++ standard yet I
>> >> > > think. The Boost regex library is fully templated and ought
>> >> > > to support wchar_t as well, but I have not tried this.
>> >> > > According to Boost documentation one needs a separate ICU
>> >> > > library for full Unicode support though.
>> >> > Well, take a look at my snippet:
>> >> > std::ifstream infile(argv[1]);
>> >> > std::string s;
>> >> > while (getline(infile, s))
>> >> > {
>> >> > s.erase(std::remove_if(s.begin(), s.end(), std::isspace), s.end
>> >> > ());
>> >> > std::cout << s;
>> >> > }
>> >> > Using locale on VC++2008 I've got an error reporting that
>> >> > std::isspace expects 2 arguments,
>>
>> >> That's because std::isspace requires two arguments, the
>> >> character to be tested, and the locale.
>>
>> >> > and still I don't know if the file contains unicode characters
>> >> > can be correctly handles.
>>
>> >> The functions in <locale> are pretty useless, since they only
>> >> handle single byte characters. The "approved" solution is to
>> >> read into a wstring using wifstream (embedded with the
>> >> appropriate locale), and use isspace (again with the appropriate
>> >> locale) on the wchar_t in the wstring.
>>
>> >> --
>> >> James Kanze
>>
>> > Ok, well, suppose I want to use UTF-8 encoding, how do I specify it
>>
>> With UTF-8 one is using char, not wchar_t. Note that if char is a
>> signed type, then one must take care to cast char to unsigned char in
>> places where a non-negative value is expected.
>>
>> By historic reasons the locale and encoding stuff has been mixed up.
>> Are you more interested in locales or in encodings? Locales affect
>> such stuff
>
>> as the character of representing the decimal point in numbers, look
>> of the dates and whether V and W are sorted together or separately,
>> and whether cyrillic characters are considered alphabetic characters
>> or not. Encoding is a fully different business, specifying for
>> example how those cyrillic characters are encoded in the binary data,
>> if at all.
>>
>> If you just want to translate different encodings, then you do not
>> need any locale stuff at all. When a web page comes in, you do not
>> know if the decimal point used in numbers therein is a dot or a
>> comma, for example, so strictly speaking you cannot set the correct
>> locale for processing the page. What you can do is to look at BOM
>> markers and charset encoding, and to translate the file from its
>> charset to the encoding you are using internally, for example. For
>> that, again no locales are needed, but instead one needs some kind os
>> system-sepcific code or other library like iconv.
>>
>> > using locale? And where can I find a list of the possible locale
>> > encoding configuration (e.g. if I wanted to correctly decode a web
>> > page just parsing the fist bytes looking for 'charset')?
>>
>> http://www.iana.org/assignments/character-sets
>>
>> But you don't want to deal with this by yourself. Use a library like
>> iconv.
>>
>> hth
>> Paavo
>
> Ok, so suppose I want to split a russian text into words and the base
> method look at every character in order to decide if a space is found,
> what do you suggest?

If you mean space as ASCII character 32, then I would use the text
encoded in UTF-8 and compare each byte with ' '.

However, if you mean any whitespace, then I would start by finding out at
unicode.org site if there are any non-ASCII whitespace characters defined
in the standard Russian locale. If there are, and wchar_t on the given
platform is wide enough to represent all of them in a single wchar_t,
then I could encode the text as UTF-16 or UTF-32 as appropriate for
wchar_t on the given platform and use std::isspace<wchar_t>() with the
Russian locale.

Or I could keep the text in UTF-8 and use my own custom function for
checking for the whitespace, checking directly for all Unicode whitespace
characters as listed in http://en.wikipedia.org/wiki/Whitespace_%
28computer_science%29, this seems to me much less error-prone than
worrying if Russian locale and std::isspace are working correctly on all
platforms.

hth
Paavo

==============================================================================
TOPIC: system("ls")
http://groups.google.com/group/comp.lang.c++/t/ea8887c99b1a8b02?hl=en
==============================================================================

== 1 of 1 ==
Date: Fri, Jan 29 2010 4:48 am
From: Matko

On Thu, 21 Jan 2010 20:07:03 +0000, Matko wrote:

> Hi!
> Is there a better way to get data returned by 'ls' command instead of
> 'system("ls > file.txt");' and then reading the file. I'm thinking of
> something that would return 'const char *' into my buffer.
>
> Thanks!
> God bless you!

Thank You very much everyone for your effort!

I am pleased with your responds. Nevertheless, i have used system("ls >
file.txt") which was sufficient for my case.

God bless you!

==============================================================================
TOPIC: Another strange linux kernel change
http://groups.google.com/group/comp.lang.c++/t/e05a4158a9750a03?hl=en
==============================================================================

== 1 of 6 ==
Date: Fri, Jan 29 2010 5:45 am
From: "Man-wai Chang to The Door (24000bps)"

i++ --> ++i, on a separate line! Does it matter?

http://www.kernel.org/diff/diffview.cgi?file=%2Fpub%2Flinux%2Fkernel%2Fv2.6%2Fincr%2Fpatch-2.6.32.6-7.bz2;z=69

--
@~@ Might, Courage, Vision, SINCERITY.
/ v \ Simplicity is Beauty! May the Force and Farce be with you!
/( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.32.6
^ ^ 21:44:01 up 2 days 7:24 2 users load average: 1.38 1.19 1.11
不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA):
http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa

== 2 of 6 ==
Date: Fri, Jan 29 2010 6:20 am
From: Vladimir Jovic

Man-wai Chang to The Door (24000bps) wrote:
>
> i++ --> ++i, on a separate line! Does it matter?
>

No.

If it was like this:
j = ++i + i ++;
then it would matter.

== 3 of 6 ==
Date: Fri, Jan 29 2010 6:19 am
From: Victor Bazarov

Man-wai Chang to The Door (24000bps) wrote:
>
> i++ --> ++i, on a separate line! Does it matter?
>

Do you mean to tell us that you don't know the difference between
pre-increment and post-increment?

V
--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask

== 4 of 6 ==
Date: Fri, Jan 29 2010 6:23 am
From: Victor Bazarov

Vladimir Jovic wrote:
> Man-wai Chang to The Door (24000bps) wrote:
>>
>> i++ --> ++i, on a separate line! Does it matter?
>>
>
> No.
>
> If it was like this:
> j = ++i + i ++;
> then it would matter.

Huh?

Are you saying that

j = i++;

and

j = ++i;

have the same effect?

V
--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask

== 5 of 6 ==
Date: Fri, Jan 29 2010 6:43 am
From: Daniel Giaimo

On 1/29/2010 8:45 AM, Man-wai Chang to The Door (24000bps) wrote:
>
> i++ --> ++i, on a separate line! Does it matter?
>
> http://www.kernel.org/diff/diffview.cgi?file=%2Fpub%2Flinux%2Fkernel%2Fv2.6%2Fincr%2Fpatch-2.6.32.6-7.bz2;z=69

i++ increments i and returns the old value. ++i increments i and
returns the new value. So, for example, if i were 4 to begin with,
then before the change the code would cause i to become 5 and j to
become 4, and after the change the code would cause i to become 5
and j to become 5.

--
Dan G

== 6 of 6 ==
Date: Fri, Jan 29 2010 7:37 am
From: Vladimir Jovic

Victor Bazarov wrote:
> Vladimir Jovic wrote:
>> Man-wai Chang to The Door (24000bps) wrote:
>>>
>>> i++ --> ++i, on a separate line! Does it matter?
>>>
>>
>> No.
>>
>> If it was like this:
>> j = ++i + i ++;
>> then it would matter.
>
> Huh?
>
> Are you saying that
>
> j = i++;
>
> and
>
> j = ++i;
>
> have the same effect?

Yes, that's what I said (shame on me). Fortunately I do not have to
debug offset by 1 in the j ;)

==============================================================================
TOPIC: Looking for C++ IDE,...
http://groups.google.com/group/comp.lang.c++/t/e8a1db0949215858?hl=en
==============================================================================

== 1 of 4 ==
Date: Fri, Jan 29 2010 7:27 am
From: Kerem Gümrükcü

Hi,

i am looking fo a (free, non-microsoft!) C++ IDE for windows, that
can do most of the MSVC++ stuff (resources, projects, etc.) but most
important is the abillity to easily switch between processor targets
for the compiler/linker e.g. it should have a 32 and 64 bit compiler
included in the environment and 64 bit code can be compiled on
a 32 bit system. I want to target Windows only (windows api is the
foundation or will be), so there is no need to use a mixed environment.

What can you recommend,...?

Thanks in advance,...

Regards

Kerem

--
-----------------------
Beste Grüsse / Best regards / Votre bien devoue
Kerem Gümrükcü
Latest Project: http://www.pro-it-education.de/software/deviceremover
Latest Open-Source Projects: http://entwicklung.junetz.de
-----------------------

== 2 of 4 ==
Date: Fri, Jan 29 2010 8:00 am
From: Victor Bazarov

Kerem Gümrükcü wrote:
> i am looking fo a (free, non-microsoft!) C++ IDE for windows, [..]
>
> What can you recommend,...?

I recommend asking in a Windows programming newsgroup.

V
--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask

== 3 of 4 ==
Date: Fri, Jan 29 2010 8:13 am
From: Kerem Gümrükcü

Thanks for the reply, i am currenty having
a look at Open Watcom C++ and Ultimate C++.
Ultimate C++ looks fine, especially it has a simple
build interface that will make switch between x64/64
easy,...so it looks at first,...

Regards

Kerem

"Victor Bazarov" <v.Abazarov@comAcast.net> schrieb im Newsbeitrag
news:hjv0ne$lf9$1@news.datemas.de...
> Kerem Gümrükcü wrote:
>> i am looking fo a (free, non-microsoft!) C++ IDE for windows, [..]
>>
>> What can you recommend,...?
>
> I recommend asking in a Windows programming newsgroup.
>
> V
> --
> Please remove capital 'A's when replying by e-mail
> I do not respond to top-posted replies, please don't ask

== 4 of 4 ==
Date: Fri, Jan 29 2010 9:00 am
From: "BGB / cr88192"

"Kerem Gümrükcü" <kareem114@hotmail.com> wrote in message
news:hjuuog$k8k$02$1@news.t-online.com...
> Hi,
>
> i am looking fo a (free, non-microsoft!) C++ IDE for windows, that
> can do most of the MSVC++ stuff (resources, projects, etc.) but most
> important is the abillity to easily switch between processor targets
> for the compiler/linker e.g. it should have a 32 and 64 bit compiler
> included in the environment and 64 bit code can be compiled on
> a 32 bit system. I want to target Windows only (windows api is the
> foundation or will be), so there is no need to use a mixed environment.
>
> What can you recommend,...?
>

Eclipse?...

I guess some people like it, but personally I have not used it (never really
felt that much need for IDE's, personally, but I guess they have their
appeal).

admitted, IDE's are not strictly topical for a C++ group (after all, we all
know that the one true build system is Makefile's...).

going OT here:
it is my personal observation that thus far, MSVC is seemingly the only
"good" compiler with "good" Win64 support at present. MinGW-w64 exists, but
I am less certain about its present reliability (may be worth a try though).

but, if cost is the concern, the Windows SDK is a free download FWIW.
it could then be "possible" to make a free setup with Eclipse+MSVC (granted,
I have not tried this).

(I am using a current build setup of GNU Make + MSVC...).

note:
here I am using MSVC to refer to the backend compiler (comes free with the
Windows SDK), in contrast to Visual Studio (which costs money, except as
'Express'), which is the IDE (and which uses the MSVC compiler as a
backend).

note that to make really any of this work well may require a slight bit of
fiddly (as in editing files, setting up environment variables, ...).

==============================================================================
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Date: Fri, Jan 29 2010 8:17 am
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