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Re: [ublas] gmane news archive not updated
by Toon Knapen 05 Jan '05

05 Jan '05

Paul Baxter wrote: > I note that the gmane news interface to this list (and the other boost > lists) got stopped in mid December. The others have been restarted, but > ublas is still not showing newer posts (mailman archive is fine). I'm > afraid I don't know what's involved in restarting them.... me neither ;-( Anyone ? > Perhaps it might make sense to have an additional 'common administrator' > for the various boost mailing lists for carrying out activities common > to all lists (like restarting the feeds). I'm not suggesting the > administrator also does ublas-specific work as the current ublas team > are doing a great job. (BTW thanks for setting up the new list!) > > I also note that http://www.boost.org/more/mailing_lists.htm still > refers to the yahoo ublas list. It might be useful to update that link > as well to refer to both the mailman page and the gmane ublas news feed > in a similar way to the spirit and language bindings projects now do. Anybody can explain me the process for doing this ?

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Portable alternative for VS.NET __if_exists
by Mårten Rånge 05 Jan '05

05 Jan '05

Im looking for a portable version of __if_exists (VS.NET keyword) and unfortunately google turned up nothing good. I use boost fairly regular and checked boost::type_traits but found nothing that seemed to similar. Has anyone heard of something that can accomplish this? As a side note, I got inspired by the technique used when to enable/disable template class specializations using boost::enable_if and succeeded in creating something that managed this: struct x { typedef std::string aggregated_type; }; struct y { }; int main(int, char*) { std::cout << is_aggregated_type_available<x>::value << std::endl; std::cout << is_aggregated_type_available<y>::value << std::endl; } Prints: 1 0 Which means that x has an aggregated type named aggregated_type. Unfortunately I failed miserably when trying to test for member variables and member functions. So I thought I take my chance and post my question here. Regards, Mårten Rånge PS. I want to give a big thank-you to the boost community for putting 1.32.0 together. It was worth waiting for. PS. I attached is_aggregated_type_available in case anyone is interested. Unfortunately only tested on VS.NET 2003 and VS.NET 2005 Beta 1 but it feels like it should work on more compilers due to the similarities with the examples in boost::enable_if documentation.

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RE: [boost] Re: Portable alternative for VS.NET __if_exists
by Roman Yakovenko 05 Jan '05

05 Jan '05

> -----Original Message----- > From: David Abrahams [mailto:dave@boost-consulting.com] > Sent: Tuesday, January 04, 2005 7:42 PM > To: boost(a)lists.boost.org > Subject: [boost] Re: Portable alternative for VS.NET __if_exists > > > Mårten Rånge wrote: > > I’m looking for a portable version of __if_exists (VS.NET > keyword) and > > unfortunately google turned up nothing good. > > > > I use boost fairly regular and checked boost::type_traits > but found nothing > > that seemed to similar. > > > > Has anyone heard of something that can accomplish this? > > It might help if you described what it does. full explanation: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclang/htm… short explanation: __if_exists allows you to conditionally include code depending on whether the specified symbol exists. __if_exist ( variable ) { statements } where: variable The symbol whose existence you want to test for. statements One or more statements to execute if variable exists. > > -- > Dave Abrahams > Boost Consulting > http://www.boost-consulting.com > > _______________________________________________ > Unsubscribe & other changes: > http://lists.boost.org/mailman/listinfo.cgi/boost >

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RE: [boost] Yet another variant-style type, and boost inter-library dependencies
by Brian Braatz 05 Jan '05

05 Jan '05

> -----Original Message----- > From: boost-bounces(a)lists.boost.org [mailto:boost-bounces@lists.boost.org] > On Behalf Of christopher diggins > > In general I am curious about how other boosters feel about boost library > sizes and inter-library couplings. For me this is a big obstacle to using > boost in many circumstances. It doesn't seem to be a concern at all for > the > boost community, but I wonder if other programmers have similar sentiments > and find themselves often seeking out simpler alternatives. > Hmmm.... What you "get" with boost, to me, far outweighs library dependency. If you decouple TOO much, you end up re-inventing the wheel too many times. I am currently, for example, writing a Domain Specific Language on top of boost.lambda. It would not make sense to decouple, nor does the boost dependency bother me. In some ways this is like saying that since I never use std::list<> and always use vector<> that I would like to purchase my compiler without this header. The std libraries are "standard" and you can publish code with list<> or vector<> and know it will work on people's compilers. It is in the same way that I see boost. It is something of a "standard". (though also a work in progress) It is not clear to me what the "big obstacle" is? If you are publishing an article, then say "boost 1.32 required". Maybe I am way off base, but I just don't see the issue. " For me this is a big obstacle to using > boost in many circumstances." If you could tell us about the circumstances where this is a problem, we might be able to better see where you are coming from.

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Re: Anyone interested in network interface (sockets)library?
by Don G 04 Jan '05

04 Jan '05

Jonathan - thanks for the info. I hadn't seen the wiki before; is it an "official" boost area? The giallo project looks light on the surface. Perhaps more is available in its CVS repository. I will have to see figure out why my search didn't turn up any messages - several threads were referenced in the wiki. Odd. You mentioned several works in progress, but only giallo was mentioned on the wiki. I will look at the Yahoo files area next. Were is the best place to discuss the design of this library? Here? Thanks again! Don >Don G wrote: >> I was curious if others have discussed this before. I searched and >> found nothing on "socket" or "network". > Yes, everyone is interested in a sockets library ;-) > > There are several works in progress. A number of them are in the > Yahoo files section. The furthest along, I think, is Hugo Duncan's > Giallo project. > > http://sourceforge.net/projects/giallo/ > > There's also some discussion on the Wiki: > > http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl?BoostSocket > >> Best, >> Don > >Jonathan __________________________________ Do you Yahoo!? The all-new My Yahoo! - What will yours do? http://my.yahoo.com

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pthread_handle_sigrestart boost 1.31
by Gaetano Mendola 04 Jan '05

04 Jan '05

Hi all, some time my application die from back trace this is what I see: #0 0x400369d5 in pthread_handle_sigrestart () from /lib/i686/libpthread.so.0 #1 <signal handler called> #2 0x420292e5 in sigsuspend () from /lib/i686/libc.so.6 #3 0x40036679 in __pthread_wait_for_restart_signal () from /lib/i686/libpthread.so.0 #4 0x40032f2c in pthread_cond_wait () from /lib/i686/libpthread.so.0 #5 0x40017bf2 in ?? () #6 0x080628e0 in boost::detail::function::void_function_obj_invoker0<PacketSwitcher<PacketContainer<IpPacket*> >, void>::invoke(boost::detail::function::any_pointer) () at buffer.h:106 #7 0x4001a646 in ?? () #8 0x40033fef in pthread_start_thread () from /lib/i686/libpthread.so.0 I'm using the version boost 1.31 ( just the thread library ) am I missing something or is a known problem? Regards Gaetano Mendola

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[Boost-bugs] [ boost-Bugs-1095697 ] bug in ublas/storage.hpp
by SourceForge.net 04 Jan '05

04 Jan '05

Bugs item #1095697, was opened at 2005-01-04 04:28 Message generated for change (Tracker Item Submitted) made by Item Submitter You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=107586&aid=1095697&group_… Category: None Group: None Status: Open Resolution: None Priority: 5 Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: bug in ublas/storage.hpp Initial Comment: Hi all, I have found a bug in boost-1.32.0-1.fc3: /usr/include/boost/numeric/ublas/storage.hpp:707: error: declaration of `class T' /usr/include/boost/numeric/ublas/storage.hpp:703: error: shadows template parm `class T' template<class T> class shallow_array_adaptor: public storage_array<shallow_array_adaptor<T> > { template<class T> struct leaker { typedef void result_type; typedef T *argument_type; BOOST_UBLAS_INLINE result_type operator () (argument_type x) {} }; Pls, replace name of the template parameter T in struct leaker. Thanks. witali.kusnezow(a)neuroinformatik.rub.de ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=107586&aid=1095697&group_… ------------------------------------------------------- The SF.Net email is sponsored by: Beat the post-holiday blues Get a FREE limited edition SourceForge.net t-shirt from ThinkGeek. It's fun and FREE -- well, almost....http://www.thinkgeek.com/sfshirt _______________________________________________ Boost-bugs mailing list Boost-bugs(a)lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/boost-bugs

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auto-link and comeau?
by Robert Ramey 04 Jan '05

04 Jan '05

I've made source changes to accommodate Comeau. Now even static libraries fail to compile on with this compiler. Is this the intention or am I missing something. Robert Ramey

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RE: [boost] Re: FYI Lambda Question
by Brian Braatz 04 Jan '05

04 Jan '05

> -----Original Message----- > On Behalf Of Aleksey Gurtovoy > Subject: [boost] Re: FYI Lambda Question > Brian Braatz writes: > > We MIGHT have some missing files? I am about to convert to > > boost 1.32 I am still on 1.31. In the 1.31 zip file I > > downloaded (and am using), the header does not exist in the > > utility dir. > > That's 'cause 'result_of' was introduced in 1.32. > > > I grepped the boost tree for result_of and only > > found one comment in transform_iterator.hpp which is stated > > as a question ("do we need to adjust the way > > function_object_result is computed for the standard proposal > > (e.g. using Doug's result_of)?") (line 64). > > > > The link to the web page you sent me points to a HPP file. > > This file does not seem to exist in utility. For experimenting, > > I copied the file referenced in the page below to > > boost\utility. It complained on the line > > > > #include <boost/mpl/has_xxx.hpp> > > > > That has_xxx.hpp does not exist. > > Again, it does in 1.32. > Thanks you *very much* for help here. This issue is pushing me to convert to 1.32 (which is good- I am doing that NOW). And without help from everyone who is added thoughts, I would still be in the bicycle shed. (I still am but I now see the door). :) Once I get converted and get my code working, I will post to this list a quick how to on what the resolution to the original question was (this way other folks can find the solution in the future by searching mail archives). ****************** SEPARATE THREAD: It would be nice if boost doc pages pointed to a WIKI or something for people to add things to the documentation (not officially added mind you- just ammendums)(similar to how people can comment on products on amazon.com for example) . I.e. once I get code working on how to deduce return type from a lambda functor, it would be nice if I could put that info someplace easy for others to find. OR- Is the solution for me to write up a page of documentation and simply request it be added to the lambda documentation? (which raises the issue)- is there any process for this? Thanks Again Guys. It is the people that give boost the real "boost" :)

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Re: [thread] Resource usage in Win32 version of condition class
by Don G 04 Jan '05

04 Jan '05

Hi Roland, >>I may be worried over something inconsequential, but the condition >>class creates three kernel objects per instance. >> > There is quite a lot of archived discussion available about this > topic. There is agreement, that on windows this is the only reliable > way of doing it. Beneath the boost list you might also google for > "condition win32". > As far as I understood the main issue that it is not possible to > implement a condition on win32 with a single event is that it is not > possible to awake a single thread _and_ awake all threads. > You can't achive both available semantics with an event alone. I agree that if _all_ capabilities of a posix condition variable are required, my approach would not work. I used one event per waiting thread, the condition variable was permanently associated with the mutex (not just when waiting), and the caller to notify/notifyAll had to have the same mutex. Adding a lightweight_mutex to the condition variable would enable the missing features, but as I said, I saw no need. Sadly, I must confess that I don't understand your reference to the Monitor pattern (been too long since I read that book) and how it relates. > As opposed to conditions your construct also would create a > condition with "state". This is not a condition anymore. It has nearly all the benefits of a full condition variable, is more convenient (safer?) in cases where the mutex passed to wait() is always the same, and is implementable on both platforms with minimal overhead. Unless I am missing something quite fundamental (which is certainly possible<g>), the extra power of on-the-fly association and notify-w/o-holding-mutex don't justify the cost these features entail. I just wrote this off as a satisfactory, least-common-denominator to gain most of the benefit condvars offer. Thanks & Best regards! Don PS: I searched on "condition win32" on www.boost.org and got only 9 hits. A full google turned up an article by Douglas Schmidt that I had read some years back (the top hit). How should I search to find these old discussions? ===== __________________________________ Do you Yahoo!? Send holiday email and support a worthy cause. Do good. http://celebrity.mail.yahoo.com

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