soft and program: comp.lang.c++ - 7 new messages in 6 topics

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

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Today's topics:

* Escape a string to bytes - 1 messages, 1 author
http://groups.google.com/group/comp.lang.c++/t/0ed981f009a7ba73?hl=en
* Another strange linux kernel change - 1 messages, 1 author
http://groups.google.com/group/comp.lang.c++/t/e05a4158a9750a03?hl=en
* Safe to use substr? - 2 messages, 1 author
http://groups.google.com/group/comp.lang.c++/t/cece8bdad80abdbe?hl=en
* isspace - 1 messages, 1 author
http://groups.google.com/group/comp.lang.c++/t/89ca303518428e34?hl=en
* ISO C++ forbids assignment of arrays - is there a way out ? - 1 messages, 1
author
http://groups.google.com/group/comp.lang.c++/t/3653ac60c7f02d4a?hl=en
* ｡◕‿◕｡ 2010 Cheap price wholesale Affliction Jean, Bape Jean, G-star Jean,
Evisu Jean at www.fjrjtrade.com <Paypal Payment> - 1 messages, 1 author
http://groups.google.com/group/comp.lang.c++/t/d2817deb6e12ca1b?hl=en

==============================================================================
TOPIC: Escape a string to bytes
http://groups.google.com/group/comp.lang.c++/t/0ed981f009a7ba73?hl=en
==============================================================================

== 1 of 1 ==
Date: Sun, Jan 31 2010 7:23 pm
From: ram@zedat.fu-berlin.de (Stefan Ram)

Philliam Auriemma <phil.auriemma@gmail.com> writes:
>Any idea how I could make it into a 'string' that could contain null
>characters?

This is already possible with the version you just quoted.

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

== 1 of 1 ==
Date: Sun, Jan 31 2010 8:00 pm
From: tonydee

On Jan 31, 9:04 pm, "Man-wai Chang to The Door (24000bps)"
<toylet.toy...@gmail.com> wrote:
> If that line was critical, it should have caused a kernel error in the
> very beginning... :)

Ummmm... if your idea of quality control is that anything that doesn't
immediately crash your kernel can't be too bad, then please don't
submit any code.... ;-P. - Tony

==============================================================================
TOPIC: Safe to use substr?
http://groups.google.com/group/comp.lang.c++/t/cece8bdad80abdbe?hl=en
==============================================================================

== 1 of 2 ==
Date: Sun, Jan 31 2010 8:22 pm
From: LR

James Kanze wrote:
> On 31 Jan, 16:58, Immortal Nephi <Immortal_Ne...@hotmail.com> wrote:
>
>> The minimum size_type is 0 and maximum size_type is 0xFFFFFFFE
>> (on 32 bit machine). Both integer values provide you the
>> information how many elements do string have.
>
> What do you mean by "both" here? A zero value designates the
> first character of the string, or indicates that the length of
> the string is 0. The maximum value is used as a sentinal:
> std::string::size will never return it. The only functions
> which do return it are those which look for something, and they
> use it as a special value, to indicate that they didn't find
> what they were looking for.
>
>> The 0xFFFFFFFF or -1 indicates that data in the string is not
>> found or is not valid.
>
> (Just a nit, but 0xFFFFFFFF is *not* -1. They're two different
> values.)
>
>> Let's discuss substr() function. The substr() function's
>> first parameter must always have minimum size_type and maximum
>> size_type.
>
> The first argument must be in the range [0...s.size()], where s
> is the string you're concerned with. It specifies the index of
> the first character in the substring you want.
>
>> If 0xFFFFFFFF or -1 is detected, then exception will be
>> thrown.
>
> (Again, -1 cannot be detected, because it cannot be represented
> on the type of the argument.)

My copy of the standard, or my most recent copy of a working draft
explicitly initializes static const size_type npos = -1;

== 2 of 2 ==
Date: Sun, Jan 31 2010 8:28 pm
From: LR

James Kanze wrote:
> On 31 Jan, 21:19, LR <lr...@superlink.net> wrote:
>> Immortal Nephi wrote:
>
> [...]
>> I think this will work:
>
>> const std::string
>> data = std::string("Hello ") + '\0' + std::string("World");
>
> An even simpler solution might be:
> std::string const data( "Hello \0World", 12 );

I didn't think of that, but I hate to count things since I think it
makes maintenance more difficult.

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

== 1 of 1 ==
Date: Sun, Jan 31 2010 11:15 pm
From: Paavo Helde

gervaz <gervaz@gmail.com> wrote in
news:05ee428d-a702-4e92-ad57-14a554a72abf@3g2000yqn.googlegroups.com:

> On Jan 31, 2:17 pm, Paavo Helde <myfirstn...@osa.pri.ee> wrote:
>> gervaz <ger...@gmail.com> wrote
>> innews:a5a4ece2-5b9d-4846-a818-9de61c1306
> 54@r24g2000yqd.googlegroups.com:
>>
>>
>>
>> > On Jan 31, 10:39 am, Paavo Helde <myfirstn...@osa.pri.ee> wrote:
>> >> Paavo Helde <myfirstn...@osa.pri.ee> wrote
>> >> innews:Xns9D116950C4paavo256@2
>> > 16.196.109.131:
>>
>> >> > gervaz <ger...@gmail.com> wrote in news:f9eec1c9-5570-461a-bdec-
>> >> > 6dec26dab...@o28g2000yqh.googlegroups.com:
>>
>> >> >> On Jan 30, 1:15 pm, James Kanze <james.ka...@gmail.com> wrote:
>> >> >>> On Jan 30, 12:05 pm, r...@zedat.fu-berlin.de (Stefan Ram)
>> >> >>> wrote:
>>
>> >> >>> > James Kanze <james.ka...@gmail.com> writes:
>> >> >>> > >There are no standard names for locales
>> >> >>> > AFAIK, C90 defines a locale by the name of "C",
>> >> >>> > which should also be visible from C++.
>>
>> >> >>> And Posix defines "POSIX". Neither of which are really usefu
> l
>> >> >>> for anything.
>>
>> >> >>> --
>> >> >>> James Kanze
>>
>> >> >> Ok, so I think that I will open my file specifying to use UTF-8
>> >> >> encoding, but how can I do it in C++?
>>
>> >> > You can open it as a narrow stream and read in as binary UTF-8,
>> >> > or (maybe) you can open it as a wide stream and get an automatic
>> >> > translation from UTF-8 to wchar_t. The following example assumes
>> >> > that you have a file test1.utf containing valid UTF-8 text. It
>> >> > reads the file in as a wide stream and prints out the numeric
>> >> > values of all wchar_t characters.
>>
>> >> > #include <iostream>
>> >> > #include <fstream>
>> >> > #include <locale>
>> >> > #include <string>
>>
>> >> > int main() {
>> >> > std::wifstream is;
>> >> > const std::locale filelocale("en_US.UTF8");
>> >> > is.imbue(filelocale);
>> >> > is.open("test1.utf8");
>>
>> >> > std::wstring s;
>> >> > while(std::getline(is, s)) {
>> >> > for (std::wstring::size_type j=0; j<s.
> length(); ++j)
>> > {
>> >> > std::cout << s[j] << " ";
>> >> > }
>> >> > std::cout << "\n";
>> >> > }
>> >> > }
>>
>> >> > (Tested on Linux with a recent gcc, I am not too sure if this
>> >> > works on Windows. First, wchar_t in MSVC is too narrow for real
>> >> > Unicode, at best one might get UTF-16 as a result.)
>>
>> >> For curiosity, I tested this also on Windows with MSVC9, and as
>> >> expected it did not work, the locale construction immediately
>> >> threw an exception (bad locale name). Neither did any alterations
>> >> work ("english.UTF8", ".UTF8", ".utf-8", ".65001").
>>
>> >> Thus, if one wants any portability it seems the best approach
>> >> currently is still to read in binary UTF-8 and perform any needed
>> >> conversions by hand.
>>
>> >> Paavo
>>
>> > Under Windows, you have to use const std::locale filelocale
>> > ("English_Australia.1252") according to
>> >http://docs.moodle.org/en/Table_of_locales, I've tested it in VC++08
>> > and it works. Any suggestion in how to handle the dualism?
>>
>> Did you actually test the results? It seems this is reading UTF-8 in
>> unaltered, so there is no point to use a wide stream in the first
>> place.
>>
>> Paavo
>
> Well, yeah, although using an example file like
> http://www.cl.cam.ac.uk/~mgk25/ucs/examples/UTF-8-demo.txt and using
> plain std::string, std::ifstream and std::cout everything works fine,
> if I put the 'w' in front of all this types the sysout fails
> producing:
>
> UTF-8 encoded sample plain-text file
> Γ
>
> Why??

Because codepage 1252 has nothing to do with UTF-8.

BTW, in Windows, I would not rely also too much on what you see on the
console. That's why I printed out only numeric wchar_t values in the
earlier example.

Paavo

==============================================================================
TOPIC: ISO C++ forbids assignment of arrays - is there a way out ?
http://groups.google.com/group/comp.lang.c++/t/3653ac60c7f02d4a?hl=en
==============================================================================

== 1 of 1 ==
Date: Sun, Jan 31 2010 11:54 pm
From: Xavier Roche

Hi folks,

How to assign an array in a constructor, when the array is needed in
another constructor ?

Typical case: a class "A" defined elsewhere (ie. not my code) which
takes an int&/char** as constructor:

class A {
public:
A(int & argc, char ** argv);
}

And my class B, which has A as member. A must be initialized in the
constructor ; therefore I tried the following construct:

class B {
public:
B();

protected:
A a;

private:
char progName[4]; // dummy
int argc;
char *argv[2];
}

B::B(): progName("foo"),
argc(1),
argv({progName, NULL}),
a(argc, argv)
{
}

This code is not correct (and won't compile) - as I can not initialize
the array directly. ("expected primary-expression before '{' token" --
"ISO C++ forbids assignment of arrays")

Is there a way out, or do I have to give up and use a pointer to A as
member, with proper "manual" new construct ?

Thanks in advance for any enlightenment.

==============================================================================
TOPIC: ｡◕‿◕｡ 2010 Cheap price wholesale Affliction Jean, Bape Jean, G-star
Jean, Evisu Jean at www.fjrjtrade.com <Paypal Payment>
http://groups.google.com/group/comp.lang.c++/t/d2817deb6e12ca1b?hl=en
==============================================================================

== 1 of 1 ==
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