soft and program: comp.lang.c++ - 25 new messages in 16 topics

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

comp.lang.c++@googlegroups.com

Today's topics:

* Adding streaming operators to std::string, your opinion? - 1 messages, 1
author
http://groups.google.com/group/comp.lang.c++/t/fc658b19085bc581?hl=en
* Can anyone write this recursion for simple regexp more beautifully and
clearly than the braggarts - 5 messages, 3 authors
http://groups.google.com/group/comp.lang.c++/t/af69810e4522c696?hl=en
* Need help with printing Unicode! (C++ on CentOS) - 2 messages, 2 authors
http://groups.google.com/group/comp.lang.c++/t/e7dff48651d7be5d?hl=en
* ☜♥☞replica bag replica prada bag replica new prada bag replica claasic prada
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Pleat Hobo Bag on www.guomeitrade.com - 2 messages, 1 author
http://groups.google.com/group/comp.lang.c++/t/ce422b839598940b?hl=en
* ｡◕＾◕｡Cheap brand Underwear(Prada, Puma, D&G, Boss, Versace......)---www.
fjrjtrade.com (paypal payment) - 1 messages, 1 author
http://groups.google.com/group/comp.lang.c++/t/5fc1e3112e8d4aaa?hl=en
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http://groups.google.com/group/comp.lang.c++/t/d1673a7fd0f79eab?hl=en
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http://groups.google.com/group/comp.lang.c++/t/f2856c5892decc16?hl=en
* cheap wholesale replica prada bag - 1 messages, 1 author
http://groups.google.com/group/comp.lang.c++/t/59166b67312b016f?hl=en
* Modifying non-const object from const function? - 4 messages, 3 authors
http://groups.google.com/group/comp.lang.c++/t/154135abd9d930e7?hl=en
* Boost serialization of intrusive_ptr? - 1 messages, 1 author
http://groups.google.com/group/comp.lang.c++/t/91f2531a63d0de44?hl=en
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http://groups.google.com/group/comp.lang.c++/t/0784642d35224175?hl=en
* binary_search - 1 messages, 1 author
http://groups.google.com/group/comp.lang.c++/t/f8d2f91a03b44ce2?hl=en
* functions - 1 messages, 1 author
http://groups.google.com/group/comp.lang.c++/t/5be04035eb1b3057?hl=en
* How this can be possible ? - 1 messages, 1 author
http://groups.google.com/group/comp.lang.c++/t/823857e15769c0a3?hl=en
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http://groups.google.com/group/comp.lang.c++/t/bb3e7cabe4669599?hl=en

==============================================================================
TOPIC: Adding streaming operators to std::string, your opinion?
http://groups.google.com/group/comp.lang.c++/t/fc658b19085bc581?hl=en
==============================================================================

== 1 of 1 ==
Date: Tues, Sep 1 2009 5:04 am
From: Francesco

On 1 Set, 13:58, Francesco <entul...@gmail.com> wrote:
> template<class T>
> std::string& operator<<(std::string& s, T t) {

Of course, the above should read "const T& t" instead of "T t" ;-)

==============================================================================
TOPIC: Can anyone write this recursion for simple regexp more beautifully and
clearly than the braggarts
http://groups.google.com/group/comp.lang.c++/t/af69810e4522c696?hl=en
==============================================================================

== 1 of 5 ==
Date: Tues, Sep 1 2009 5:06 am
From: spinoza1111

On Aug 31, 12:32 am, c...@tiac.net (Richard Harter) wrote:
> On Sun, 30 Aug 2009 06:30:45 +0000, Richard Heathfield
>
> <r...@see.sig.invalid> wrote:
> >In <h7cc1a$e6...@enyo.uwa.edu.au>, Chris McDonald wrote:
>
> <snip>
>
> >In the current case, bolega (unknown name, to me at least) is slagging
> >off Brian Kernighan and Rob Pike (both names known to me) and their
> >book (which I've read). He starts with the word "braggart", and the
> >rest is similar ranting. It's just perfectly normal bilgewater of the
> >sort you often find on the Internet, but I don't see why we need to
> >accuse it of being nilgewater as well.
>
> Just so. The two styles are quite distinct. Generally speaking
> those who use the internet for ranting have quite individual and
> distinct styles. Thus Nilges is clearly well educated and well
> read, using many post modern and progressive tropes along with
> pop psychology. On the other hand Bolega (I thought it might be
> a sausage but apparently it is a brand of socks) is less well
> read and less literate.

I'd ask you to lay off personalities. You people have taken entirely
too long to figure out that I'm a class act, and Bolega may very well
be a class act. I wouldn't myself start off by calling Kernighan a
braggart, but I did have problems with O'Reilly's selecting some
fairly humdrum examples of "Beautiful Code" in the book containing
Kernighan's code. I was offended by Kernighan's praising programmer
for taking an hour.

>
> Incidentally, in my opinion the term "troll" isn't appropriate
> for such persons. Trolls are like malicious little children who
> stir up trouble for the pleasure of seeing people get all
> excited. These ranters have a different agenda.

Thank you for clearing that up at long last. I really appreciate it.

Trolls don't admit they are wrong to their worst enemies, but
Heathfield, who knows C if little else that I can discern, did prove
to me (along with my own experiments) that all parameters in C are
really and truly call be value, period, and as soon as I realized it,
I admitted it. I still have a problem with the fact that I had to beat
the answer out of him as well as mess with C.

>
> Richard Harter, c...@tiac.nethttp://home.tiac.net/~cri,http://www.varinoma.com
> No one asks if a tree falls in the forest
> if there is no one there to see it fall.

== 2 of 5 ==
Date: Tues, Sep 1 2009 5:13 am
From: spinoza1111

On Aug 30, 2:30 pm, Richard Heathfield <r...@see.sig.invalid> wrote:
> In <h7cc1a$e6...@enyo.uwa.edu.au>, Chris McDonald wrote:
>
> > Ed Morton <mortons...@gmail.com> writes:
>
> >>On Aug 28, 11:35=A0pm, bolega <gnuist...@gmail.com> wrote:
> >>> This braggart admits that he had to put this code in TWO books and
> >>> visit it twice to be explained. I am puting the excerpt from pp2-4
> >>> of this book and the C code.
>
> >>You should post this to comp.lang.c.
>
> >> Ed.
>
> > He did, and I smelt a Bilges sock puppet.

Don't make mock of my patronym, punk.
>
> By the walks-like,swims-like,quacks-like theorem, I do see why you
> think so, but I think we should be slow to make such accusations,
> since they are so often wrong. I have never actually been accused of
> being a sock puppet as far as I am aware, but I have certainly been
> accused of running them (which I have never done, but of course those
> who accuse me don't believe that).

Wise words, for wisdom crieth in the streets. The only time I have
used a sock puppet was once on wikipedia.
>
> People can and often do use similar styles, especially when responding
> to people with whom they're perhaps not the best of friends. The
> other day, an irregular poster, a guy - who'd been away for a while
> and is unlikely to have become familiar with my occasional habit of
> marking nilgewater with "nonsense snipped - nothing left" - made

Don't make mock of my patronym or I will make mock of you as I have in
the past. You fuck with me I fight back, you dig? My relatives are war
heroes and professionals and they don't deserve this shit.

> precisely the same response. It would be easy to accuse /him/ of
> being a sock puppet... and yet his name has been well-known in
> another group for many years and he knows far more about that group's
> subject than I do, and I vaguely recall having a few extended
> disagreements with him in the past. He also posts from a different
> continent, by the way.
>
> Sock puppets undoubtedly happen, but they don't really matter because
> what counts is not who says what, but what they say (and, to a
> certain extent, how they say it). We might pay a lot of attention to
> a name we recognise (e.g. if Donald Knuth started posting, we'd sit
> up and take notice) - but *only* after it became obvious that it
> wasn't some spotty teenager mucking about. And we judge that by
> content. "By their fruits you shall know them" and all that.
>
> In the current case, bolega (unknown name, to me at least) is slagging
> off Brian Kernighan and Rob Pike (both names known to me) and their
> book (which I've read). He starts with the word "braggart", and the
> rest is similar ranting. It's just perfectly normal bilgewater of the

Don't make mock of my patronym, since it's an insult not so much to me
as to my relatives. If you must make mock, my first name is Edward and
my handle is spinoza1111.

My uncle, Edward Joseph NILGES, was killed in Italy in March 1945
leading Japanese American Nisei against the Germans. Don't mock him.

My father, Richard G Nilges, fought unethical practises in medicine.
Don't mock him.

Mock my first name or posting handle. Lay off "Nilges".

> sort you often find on the Internet, but I don't see why we need to
> accuse it of being nilgewater as well.
>
> --
> Richard Heathfield <http://www.cpax.org.uk>
> Email: -http://www. +rjh@
> "Usenet is a strange place" - dmr 29 July 1999
> Sig line vacant - apply within

== 3 of 5 ==
Date: Tues, Sep 1 2009 5:34 am
From: spinoza1111

On Aug 29, 10:38 pm, bolega <gnuist...@gmail.com> wrote:
> On Aug 29, 2:51 am,spinoza1111<spinoza1...@yahoo.com> wrote:
>
> > Many people seem to have been upset with this article in Beautiful
> > Code. I emailed Kernighan about it and received a reply (I'd met the
> > guy), but no real answer to the basic problem, which is that C cannot
> > express programming ideas clearly.
>
> I admire the fact that someone brought all this in the public
> discussion because a lot of sleazy people (not referring in particular
> to this troika) have been able to propagate crap and kept it immune to
> academic critique just due to people afraid of criticizing it which
> leads to a lot of newbie sheeple.
>
> Do you think C syntax is brain damaged ? Can you explain your second
> point in more detail and clearly as I could not understand any of it.
>
> > The first problem is that by being so "simple" it fails to implement a
> > recognizable "regular expression" processor.
>
> > I thought a second problem was that it used a value parameter as a
> > work area, which isn't something I would do in my languages of choice
> > (C Sharp and VB in recent years), but I found myself doing this in C
> > when I returned to the language mostly to kick the shit out it.
>
> > A third problem is praising a programmer for fast work. There's enough
> > slipshod work in our industry, and enough programmer overwork as it
> > is.
>
> > I think Brian Kernighan would be the first to admit that Lisp as
> > opposed to C made a more far-reaching contribution to computer science.- Hide quoted text -
>
> Actually, in C all they did was to borrow parens and braces from math
> to delimit blocks - BUT lisp already had the idea in the prefix
> notation. The other contribution is the for loop with all the loop
> elements at the top in the interface. The declaration syntax of
> pointers is poor and ugly. switch-case has fall thru. break and
> continue is new unless PL1 or BCPL had it.
>
> BUT YOU HAVE NOT SHOWN how to structure the recursion. Does it need
> NFA ? I need a tutorial because C is to stay and I can avoid some of

If by NFA you mean an NDFA (non-deterministic finite automaton), no.
If you go down that road, you need to convert the regex first to an
NDFA and then to a deterministic DFA by treating groups of possible
symbols to single "symbols". A problem I have with the article is that
it doesn't confront this need.

Aho Sethi et al.'s COMPILERS (Dragon book) addresses how to do this.

But for individual regexes it's straightforward to code them directly.

> its ugliness by using C++ as pretty C.
>
> > - Show quoted text -
>
> I admire the fact that you

== 4 of 5 ==
Date: Tues, Sep 1 2009 8:25 am
From: Richard Heathfield

In <04b443ab-b17b-4ec9-9269-8a873d740483@i8g2000pro.googlegroups.com>,
spinoza1111 wrote:

> On Aug 30, 2:30 pm, Richard Heathfield <r...@see.sig.invalid> wrote:
<snip>
>>
>> In the current case, bolega (unknown name, to me at least) is
>> slagging off Brian Kernighan and Rob Pike (both names known to me)
>> and their book (which I've read). He starts with the word
>> "braggart", and the rest is similar ranting. It's just perfectly
>> normal bilgewater of the
>
> Don't make mock of my patronym

From Chambers: "*bilge* noun 1a the broadest part of a ship's bottom;
b (usually bilges) the lowermost parts on the inside of a ship's
hull, below the floorboards. 2 (also bilge-water) the dirty water
that collects in a ship's bilge. 3 /rather dated colloq/ rubbish,
nonsense, drivel."

I can see why you might object to the use of the neologism
"nilgewater", but I see no sensible reason for objecting to the
perfectly normal word "bilgewater". One might reasonably object to a
particular application thereof in a given context, but the word
itself is surely unobjectionable.

<snip>

--
Richard Heathfield <http://www.cpax.org.uk>
Email: -http://www. +rjh@
"Usenet is a strange place" - dmr 29 July 1999
Sig line vacant - apply within

== 5 of 5 ==
Date: Tues, Sep 1 2009 8:33 am
From: gazelle@shell.xmission.com (Kenny McCormack)

In article <9cede3c8-787b-4544-adfd-7f6caacc87ec@l35g2000pra.googlegroups.com>,
spinoza1111 <spinoza1111@yahoo.com> wrote:
...
>Trolls don't admit they are wrong to their worst enemies, but
>Heathfield, who knows C if little else that I can discern, did prove
>to me (along with my own experiments) that all parameters in C are
>really and truly call be value, period, and as soon as I realized it,
>I admitted it. I still have a problem with the fact that I had to beat
>the answer out of him as well as mess with C.

A few comments:
1) That they totally mis-use the word "troll" is, of course, legion. It
wouldn't be such a big deal if it weren't for how obsessively anal they
are about words here. I.e., the hypocrisy is self-evident.

1a) It has certainly become common usage over the past decade or so to
use the word "troll" as a synonym for "people we don't like" (where
"we" is interpreted to mean "the Establishment"). This makes it no
less wrong, of course, but people would be more inclined to let it
pass if it weren't for the "clc personality type" (described above).

2) I have to admit also that Dicky was right about C's parameter passing
being exclusively call by value. I will further say that this fact
always impressed me - that everything is "by value". That is, in the
context of the minimalist/portable-assembler kind of language that C is.

2a) Nonetheless, that fact is that, in all but the most obscuirely
CLC-sense, it is true that C implements call-by-reference via pointers.
To argue otherwise, is just being a jerk, and I think we all
recognize that. It is the CLC disease to be technically right, but
so obviously wrong, at the same time.

==============================================================================
TOPIC: Need help with printing Unicode! (C++ on CentOS)
http://groups.google.com/group/comp.lang.c++/t/e7dff48651d7be5d?hl=en
==============================================================================

== 1 of 2 ==
Date: Tues, Sep 1 2009 6:05 am
From: Zerex71

On Aug 31, 5:22 pm, Paavo Helde <pa...@nospam.please.ee> wrote:
> Zerex71 <mfeher1...@gmail.com> kirjutas:
>
>
>
>
>
> > On Aug 31, 2:12 pm, Paavo Helde <pa...@nospam.please.ee> wrote:
> >> Zerex71 <mfeher1...@gmail.com> kirjutas:
>
> >> > So let me see if I can explain my understanding of this whole thing
> >> > (because I want to finally solve this problem, having been trying to
> >> > figure it out off and on for quite a while):
>
> >> > 1. Let's say I have a file, and it's nothing more than a string of
> 1s
> >> > and 0s when you get right down to it.
>
> >> Ok so far.
>
> >> > 2. The encoding that I will use to read/display the file specifies
> to
> >> > the OS how to group and treat the bits.
>
> >> I think the OS really does not care, at least the Linux OS. The visual
> >> output is produced by certain applications, e.g. xterm. The
> application
> >> has to know the encoding of the input data it receives. The encoding
> of
> >> the file can be sometimes extracted from the file, like in case of XML
> >> files or BOM markers in Unicode files, and sometimes it is determined
> >> otherwise, like by the locale settings.
>
> >> > 3. A selected encoding then specifies (for lack of a better term) a
> >> > set of codepages from which to select the characters to display
> (i.e.
> >> > based on a particular grouping of bits/bytes, this will index into
> an
> >> > appropriate set of characters).
>
> >> This is internal business of the visual application or the X window
> >> system (don't know the details).
>
> >> > 4. The bytes are presented to the display portion of the OS and it
> >> > will reference the operable font in the window, editor, dialog, etc.
> >> > to display the individual characters.
>
> >> This is internal business of the visual application or the X window
> >> system (don't know the details).
>
> >> > 5. If the specified font doesn't have a glyph for a given byte
> >> > combination, the resulting behavior will be unpredictable.
>
> >> This is internal business of the visual application or the X window
> >> system (don't know the details).
>
> >> > 6. If it does, it will basically do a table lookup for the
> appropriate
> >> > glyph, and fetch that glyph and dump it to the screen.
>
> >> This is internal business of the visual application or the X window
> >> system (don't know the details).
>
> >> > Is any of this correct?
>
> >> Maybe, but hardly anything of this is relevant. The terminal program
> >> expects some kind of encoding, and you have to provide it. In Linux
> the
> >> encoding is usually UTF-8. If all your files use the same UTF-8
> encoding
> >> internally, then there is no problem, you just output the data. If you
> >> still insist on using wchar_t and UCS-4 encoding internally, then you
> >> have to perform the translation by yourself. It's as simple as that.
>
> >> hth
> >> Paavo
>
> > I don't understand your statement that hardly any of this is
> > relevant. I am describing to you my understanding of how characters
> > are stored and displayed, and am asking for corrections on the model.
> > It's a closely related tangent to my problem of direct screen output
> > (not file-based, because I don't yet have that issue to deal with).
>
> In Unix they say everything is file-based. And what is relevant is the
> communication between you (your program) and the one who is listening to
> you (in this case xterm or "eclipse console tab"). Yes it is nice to know
> how the things go further, in what exact format the fonts are stored and
> how the LCD display would make them appear in color, how the cone
> receptors in the eye are transforming this into the nerve impulses, how
> the brain visual cortex is interpreting the signals and translating back
> to visually indistinguished characters, how they are further interpreted
> as symbols carrying a specific meaning - yes, that would be nice!
>
> FWIW, I suspect that Unicode fonts are not stored as flat lookup arrays,
> rather as piecewise arrays, because of size considerations. But I'm not
> at all sure I'm right here.
>
> Paavo

Okay, I tried the following code:

const unsigned char test[4]={0xE2, 0x99, 0xAD, 0}; // This is the
conversion from 0x266d; NUL to pad
printf("Test: %s\n", test);

and it didn't work for me. I get the output: "Test: ��". I did some
more digging on Eclipse and apparently there is a startup option and
also the same option for each defined run configuration:

-Dfile.encoding=UTF8

I'm not sure that I want to change the file encoding, only the output
encoding.

I am also trying to find out how to generate a binary in Eclipse that
can be run outside of Eclipse i.e. the program executable so that I
can just run it in an xterm to see what happens. I am cross-posting
to their forums to see how to get this to work. If that fails, I may
fall back to the utf8 library referenced earlier.

Mike

== 2 of 2 ==
Date: Tues, Sep 1 2009 7:31 am
From: Juha Nieminen

Zerex71 wrote:
> And don't immediately dismiss someone because they don't have the
> interest or inclination in spending a lot of time for what seems like
> it should be a simple answer.

That's your problem: You want a solution but you are not ready to do
the necessary work to learn the solution. Even when someone outright
gives you a simple answer to your problem, you still immediately
dismissed it because you didn't go through the trouble of spending a few
minutes learning the solution.

> Moreover, don't lecture me. See
> Paavo's posts for an example of how to do this.

Which post? The one where he basically instructs you to make the UTF-8
encoding by hand?

Well, if you *really* want to encode all your strings to UTF-8 by
hand, then please go right ahead. I won't stop you.

On the other hand, you said you wanted an *easy* solution to this
problem. Using an encoding library is at least a hundred times easier
than trying to do the encoding yourself. But whatever floats your boat.

Using the library I mentioned, encoding one unicode character to UTF-8
is basically one single utf8::append() call. Encoding it by hand
requires quite a lot of work. You could, of course, write an encoder
yourself, but then you would be basically replicating utf8::append().
What would be the point? (Especially since you don't seem to have the
time for this.)

Since you seem to detest the library solution and prefer to make the
UTF-8 encoding yourself, please let me know how that worked for you. I'm
honestly curious.

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From: ckedsdfs

==============================================================================
TOPIC: Modifying non-const object from const function?
http://groups.google.com/group/comp.lang.c++/t/154135abd9d930e7?hl=en
==============================================================================

== 1 of 4 ==
Date: Tues, Sep 1 2009 7:32 am
From: Jerry Coffin

In article <054bd69c-9a71-48d1-8dd0-
005479eb1c1a@z34g2000vbl.googlegroups.com>, entuland@gmail.com
says...

[ ... ]

> Jerry, just a question to clear a doubt of mine: did you receive
> Pascal's and my replies to this thread? I'm noticing that sometimes
> people posts replies which contain already pointed out things, and
> that's strange. Maybe Google Groups is not sending out replies to the
> other servers immediately as expected, hence the delay noticed by fdm
> and your reply... I don't know.

Welcome to NNTP! I received 38 new messages at once, including one
from Pascal and two from you (one directly to the OP, and one to
Pascal) at exactly the same time I received the post to which I'm
following up.

A server doesn't normally send out replies immediately. Rather, it
has some other servers it connects to on some sort of schedule, and
when it connects it sends any new posts it has, and collects any new
posts the other has. Ultimately, it's just about like when a
newsreader connects to a server, sending any new posts it has (i.e.
whatever I've written) and collecting any new posts on that server.

If we connected to the same server, the delay between one of us
posting an article and somebody else seeing that article would
normally be expected to be pretty short -- typically in the range of
a few milliseconds up to a few seconds or so. When we're connected to
separate servers, however, the delay can be substantially longer.
Looking at the Path header, I see that your post traveled through
about 15 servers to get from you to me, so it's not a great surprise
that it takes a while.

The other thing to keep in mind is that there's no real central
management of any of this -- it's pretty much up to individual site
operators to decide what other server(s) they connect and exchange
news with. The protocol is fairly robust in tracking messages so you
don't see duplicates if a single post arrives by different routes
(barring a mis-configured server munging things up). There's far
less, however, to guarantee that a post will get to every server --
for that, it's pretty much up to individual sites to connect to
enough other servers to provide redundancy so when any given path
dies, there will probably be at least one other that works.

--
Later,
Jerry.

== 2 of 4 ==
Date: Tues, Sep 1 2009 7:40 am
From: Juha Nieminen

fdm wrote:
> Yes, was solved declaring the vector as mutable.

I hope you realize that the 'mutable' keyword should not be used
lightly, from a program design point of view.

When you declare a member function 'const', you are making the promise
that the function in question will not change the state of the object.
In other words, the object will look to the outside completely identical
after the function call as it looked prior to it. In other words, the
function does not change the object in any way (as viewed from the outside).

If you bypass the constness of a member function and change the state
of the object (in a way that is visible to the outside), you are
breaking this promise, and potentially breaking code which uses it. At
the very least it's very dubious design.

Of course this doesn't mean there are no situations where 'mutable'
would be useful. From a design point of view using it is ok only if it
changes an internal state which is not visible to the outside in any
way. In other words, even after the change the object will still behave
identically, and it's not possible to tell from the outside that it has
changed.

One concrete situation where 'mutable' is both very practical and
completely ok to use (from a design point of view) is a smart pointer
which uses double-linking instead of reference counting. (The copy
constructor and the assignment operator take const references, but the
pointers in the parameter have to be changed. However, this does not
change the external behavior of the smart pointer object.)

== 3 of 4 ==
Date: Tues, Sep 1 2009 7:53 am
From: Francesco

On 1 Set, 16:32, Jerry Coffin <jerryvcof...@yahoo.com> wrote:
> In article <054bd69c-9a71-48d1-8dd0-
> 005479eb1...@z34g2000vbl.googlegroups.com>, entul...@gmail.com
> says...
>
> [ ... ]
>
> > Jerry, just a question to clear a doubt of mine: did you receive
> > Pascal's and my replies to this thread? I'm noticing that sometimes
> > people posts replies which contain already pointed out things, and
> > that's strange. Maybe Google Groups is not sending out replies to the
> > other servers immediately as expected, hence the delay noticed by fdm
> > and your reply... I don't know.
>
> Welcome to NNTP! I received 38 new messages at once, including one
> from Pascal and two from you (one directly to the OP, and one to
> Pascal) at exactly the same time I received the post to which I'm
> following up.

[snip]

Crystal clear: I had no idea about all the issues you detailed.
Thanks a lot for your explanation.

Best regards,
Francesco

== 4 of 4 ==
Date: Tues, Sep 1 2009 8:14 am
From: Francesco

On 1 Set, 02:02, "fdm" <f...@gk.com> wrote:
> "Francesco" <entul...@gmail.com> wrote in message

[snip]

>
> > Fine, now you read all of our replies. Have you solved this issue?
>
> Yes, was solved declaring the vector as mutable.
>
> > And what about the other thread of yours that's still open - the one
> > titled "Possible problem with smartpointers (for the hardcore C++
> > gurus)"?
>
> yes is was just a matter of moving the parameters out of the subroutine.

Fine, glad to read that you solved all of those issues.

Sorry for hassling you, but it would be good to drop a message at the
end of the threads, once the issue is solved. Not simply for the
people who posted their advices there, but especially for other people
who could arrive there looking for a solution to a similar problem -
the "closing" post of the OP, resuming the problem and detailing the
solution, changes an open-issue thread to a useful resource,
eventually avoiding them to open a new topic or rehearse an old one.

Best regards,
Francesco

==============================================================================
TOPIC: Boost serialization of intrusive_ptr?
http://groups.google.com/group/comp.lang.c++/t/91f2531a63d0de44?hl=en
==============================================================================

== 1 of 1 ==
Date: Tues, Sep 1 2009 7:47 am
From: ytrembla@nyx.nyx.net (Yannick Tremblay)

In article <2009082900534416807-themindwalrus@gmailcom>,
Bradley Wilson <the.mind.walrus@gmail.com> wrote:
>> Could you explain what you expect to happen when you serialise an
>> intrusive pointer and then at a later point in time, somewhere else,
>> you deserialise it?
>
>I have some fairly complex state that will be constantly running. I need
>to be able to save all this state and load it back up for processing at a
>later time. (This is for some experimental game AI I'm playing around
>with.)
>
>Profiling my scratch code showed that my major bottlenecks were a
>dynamic cast (which I can get around by using a type variable and a
>static cast) and malloc, which is where the memory pools come into play.
>
>Smart pointers allocate space for the reference count, so I'm using
>intrinsic_ptr to avoid those. I have many fragments of data, and to
>save memory (and processing time) I'm using the intrinsic pointers
>to avoid replicating data that isn't changing.
>
>There will be several threads running and locking/unlocking for memory
>allocation was also killing performance. Since none of the threads ever
>use memory from the other threads, each thread will have its own set of
>memory pools, allowing me to avoid locking and contention hits.

Yes, that all sounds reasonable albeit fairly complex. But
intrinsic pointers are used as a way to access data efficiently. What
is important to be saved and restored is the data, not the pointers.

So you missed the point of my question: do you want to save the data
or the pointers? If you pass an intrinsic pointer to a save method,
shouldn't it be the data pointed by it that is saved rather than the
pointer value and the reference count on the data?

If you reload a previously serialised intrinsic pointer, would you
expect it to point to the same address or to point to the same data?

>This particular section of code is the very core of my AI and needs to run
>as fast as possible or I wouldn't be jumping through all these hoops. (I'm
>aiming for a minimum target population of 1000 free-thinking autonomous
>characters.)

Yes, the normal operation needs to be fast. But serialising to disk
hopefully is not in the critical path.

>> What do you intend to do with the serialised data? Do you send it or
>> store it? What receives it?
>
>I just need to save this entire block of state (containers of instrinsic_ptr's
>that point to memory allocated via memory pools) to disc ("save game"),
>and load it later ("load game").

But you don't want to save the pointers value, do you? You want to
save the data that is pointed to.

Unless your "save game" save a game data that will only ever be valid
for the currently running instance (process) of the game, saving the
value of the intrinsic_ptr and the current reference count value will
not be very useful since the next time you run the game, the memory
pool for one thread might be at a totally different address than it
was the previous time.

So it sounds to me that you need to save the content of your memory
pools to disk and boost::serialiser is a useful framework to serialise
the data, then you need to read the data from disk and load it into
your memory pools. The data saved on disk doesn't need to know about
memory pools, only the load data method needs to know where to place
the data it reads from disk.

I guess it would be possible to save the entire process memory state
and completely restore it at a later date or in a different run
instance, the complete restore would restore all intrinsic pointers
and all memory pools correctly. But saving one particular intrinsic
pointer would require a lot of hoop jumping.

Yan

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==============================================================================
TOPIC: binary_search
http://groups.google.com/group/comp.lang.c++/t/f8d2f91a03b44ce2?hl=en
==============================================================================

== 1 of 1 ==
Date: Tues, Sep 1 2009 7:59 am
From: Juha Nieminen

arunix wrote:
> int num[]={2,6,25,14,86,52,64,75,27,52,96,58,52.0};

Two responses, and neither one saw the most prominent flaw in this code.

For std::binary_search() to work the array must be sorted. It won't
work if the elements are in random order.

Either put the elements in increasing order, or sort the array using
std::sort().

> const int start=1, end=2;
> if(std ::binary_search((num+start),(num+end),check))

You are here performing a binary search for the second element in the
array only. "num+1" points to the second element in the array, and
"num+2" points to the third element (which is not included in the search).

What you want to do is std::binary_search(num, num+13, check).

==============================================================================
TOPIC: functions
http://groups.google.com/group/comp.lang.c++/t/5be04035eb1b3057?hl=en
==============================================================================

== 1 of 1 ==
Date: Tues, Sep 1 2009 8:03 am
From: Juha Nieminen

arunix wrote:
> here is mine question aout the "functions" function return a value.
> if we have parameterized function then we have to pass argument to the
> function but i was learing from a website "/www.cplusplus.com/".
>
> here is a function
>
> bool IsOdd (int i) { return ((i%2)==1); }
>
> and they used it in the count_if but with no arguments...
>
> mycount = (int) count_if (myvector.begin(), myvector.end(), IsOdd);
> its Grt Confusion......

Maybe this will clear things out:

template<typename Function>
void callThisFunction(Function f)
{
f(1);
}

void someFunction(int i)
{
std::cout << i << std::endl;
}

int main()
{
callThisFunction(someFunction);
}

(The interesting (and a bit complicated) part is what 'Function' in
that template resolves to. In this particular case you don't need to
worry about that, though.)

==============================================================================
TOPIC: How this can be possible ?
http://groups.google.com/group/comp.lang.c++/t/823857e15769c0a3?hl=en
==============================================================================

== 1 of 1 ==
Date: Tues, Sep 1 2009 8:06 am
From: Juha Nieminen

WantToKnowMore wrote:
> I'm calling a function with a class pointer without assigning to any
> class object.

Member functions are not stored inside the object. They are a bit like
normal functions, just silently taking an additional parameter (the
object in question).

Of course if the member function in question tries to access the
uninitialized object, you will get a crash or worse.

==============================================================================
TOPIC: ◎⊥◎supply factory price shoes whosesale by paypal(www.salewto.com)
http://groups.google.com/group/comp.lang.c++/t/4d8a4eba732967bd?hl=en
==============================================================================

== 1 of 1 ==
Date: Tues, Sep 1 2009 8:56 am
From: salewto

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==============================================================================
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http://groups.google.com/group/comp.lang.c++/t/bb3e7cabe4669599?hl=en
==============================================================================

== 1 of 1 ==
Date: Tues, Sep 1 2009 9:08 am
From: candy

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==============================================================================

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soft and program

Tuesday, September 1, 2009

comp.lang.c++ - 25 new messages in 16 topics - digest

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