December 2006 - Boost-users

Read-only access to boost repository via WinCVS
by alexmark 27 Dec '06

27 Dec '06

Hi! I need read-only access to boost repositiry. I've downloaded and installed WinCVS+Python but cannot open the repository. In Remote->Init Settings->CVSROOT I've checked it and entered: pserver:anonymous@boost.cvs.sourceforge.net:/cvsroot/boost and the response was: cvs -d pserver:anonymous@boost.cvs.sourceforge.net:/cvsroot/boost init cvs init: warning: unrecognized response `'ssh' is not recognized as an internal or external command, ' from cvs server cvs init: warning: unrecognized response `operable program or batch file. ' from cvs server cvs [init aborted]: end of file from server (consult above messages if any) What's wrong? TYA

4 7

graph library: finding single-pair shortest path
by Matthew Reid 27 Dec '06

27 Dec '06

2 1

Installation problems
by Yutaka Leon Suematsu 27 Dec '06

27 Dec '06

Hello Dear Boosters! Merry X'MAS and Happy New Year! I have some problems when installing the current version from cvs. I tried in Windows XP with VC++ 2003 and Python 2.5. * Command 1 C:\Source\boost>bjam -sTOOLS=vc-7_1 --with-python-version=2.5 --with- python-root=C:\Python25 --prefix="C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7" install * Result error: wrong library name 'python-version=2.5' in the --with- <library> option. ------- *Command 2 C:\Source\boost>bjam -sTOOLS=vc-7_1 --with-python-root=C:\Python25 -- with-python-version=2.5 --prefix="C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7" install *Result error: wrong library name 'python-root=C:\Python25' in the --with- <library> option. -------- * Command 3 ( Defining PYTHON_ROOT and PYTHON_VERSION) C:\Source\boost>bjam -sTOOLS=vc-7_1 --prefix="C:\Program Files \Microsoft Visual Studio .NET 2003\Vc7" install * Result The mpi module has not been initialized; MPI libraries will not be built. hint: add "using mpi ;" to user-config.jam to enable MPI support. warning: Python location is not configured warning: the Boost.Python library won't be built Building Boost.Regex with the optional Unicode/ICU support disabled. Please refer to the Boost.Regex documentation for more information (and if you don't know what ICU is then you probably don't need it). warning: No toolsets are configured. warning: Configuring default toolset "msvc". warning: If the default is wrong, you may not be able to build C++ programs. warning: Use the "--toolset=xxxxx" option to override our guess. warning: For more configuration options, please consult ECHO warning: http://boost.org/boost-build2/doc/html/bbv2/advanced/configuration.html -------- *** From this message, it can also be observed that even though "vc-7_1" was defined as toolset, bjam is using "msvc" I tried to install the same version in a Mac and problem is the same. Any ideas or fixes to this problem? I should notice that I am using the bjam (from source) obtained from the cvs version of boost Thank you in advance. Yutaka Leon Suematsu.

4 3

proposal of type_traits extensions
by Daniel 26 Dec '06

26 Dec '06

Hello, I am looking for set of templates which will help while working with class member pointers. I am sending my wish list so you can tell if my suggestions are worth implementing or not: - is_const_member_function_pointer<T> - true_type for const member function pointers (e.g. void (Test::*)() const) (BTW, is is possible to check this using current version of type_traits library?); - is_member_pointer_of<T, TClass> - true_type if T is member pointer of class TClass; - add_membership<T, TClass> - make T a pointer to member of class TClass; - remove_membership<T> - convert T TClass::* to T, and also similarly for member function pointers; - get_membership<T> - for member pointers, return class type; - member_traits<T> - returns class name and type of member pointers (can be obtained sepately by member_of<T> and remove_membership<T>); - member_function_traits<T> - similar to function_traits, but should also return class name and if function is const; Also I am looking for template which can change 'pointer to member function' to 'pointer to const member function' and vice-versa. Daniel

1 0

BOOST graph- shortest path which including a node set?
by Terence Wilson 26 Dec '06

26 Dec '06

What I need is a version of Dijkstra's shortest path where the path includes a specified set of nodes. Does this exist? TIA

2 3

Re: [Boost-users] Spamming through boost???
by Ovanes Markarian 24 Dec '06

24 Dec '06

Well, I googled for my name and found on the first page an entry from the boost archive at Gmane: >From: Ovanes Markarian <om_boost <at> xxx.xxx> Subject: [mpl::map] pregeneration of ... Is there smth, that I miss? With Kind Regards, Ovanes Markarian. To parse the string: <om_boost <at> xxx.xxx> is really silly and can be easily done with your regex lib. With Kind Regards, Ovanes Markarian On Thu, December 7, 2006 10:31, John Maddock wrote: > Sebastian Redl wrote: >> Ovanes Markarian wrote: >>> Now I really think, there must be email servers inbetween, which simply log the sender and put them to the spamming lists. >> We had this discussion a few months ago. >> In short, the easiest way to get at your e-mail address is to simply register with the boost list, and then have a bot listening and collecting. It's pretty much the same thing that some list archives do. You can't really prevent it, either. Unlike spammers, such >> accounts don't really make their presence known. Should all accounts that just listen and never post be banned? > > In addition the Boost mailing list is available via a newsgroup bridge, and gets archived on the web, indexed by Google etc (although I confess a Google search for your address didn't show anything up). As Sebastian has already said, these spammers are cunning folks whow really will stop at nothing to get these addresses :-( > > You > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users > With Kind Regards, Ovanes Markarian

5 7

Platform independent system time in milliseconds.
by Barry Andrews 23 Dec '06

23 Dec '06

Hi Boost Users, I am attempting to use the boost library date_time to create a platform independent function to get the system time in milliseconds. Basically, I need a millisecond precision timing mechanism. I read over the docs and looked at the examples from this library and came up with something that I thought would work, but it doesn't. :( ptime time_t_epoch(date(1970,1,1)); time_zone_ptr zone(new posix_time_zone("MST-07")); local_date_time dt_epoch(time_t_epoch, zone); time_zone_ptr zone2(new posix_time_zone("MST-07")); local_date_time ldt = local_microsec_clock::local_time(zone2); time_duration diff = ldt.utc_time() - dt_epoch.utc_time(); long milli = diff.total_milliseconds(); cout << milli << endl; What I get is a negative number. The function I want should have the exact same behavior as java.lang.System.currentTimeMillis() which returns "the difference, measured in milliseconds, between the current time and midnight, January 1, 1970 UTC." Is there a way to achieve this with boost? Is so, can someone please give me some hints as to how I can do this? many thanks for your help! -B

1 0

fusion_2 won't compile one it's map examples with g++3.4.3
by David Minor 23 Dec '06

23 Dec '06

This example, from the docs, won't compile with linux g++3.4.3 typedef map< pair<int, char> , pair<double, std::string> > map_type; map_type m( make_pair<int>('X') , make_pair<double>("Men")); int main() { std::cout << at<int>(m) << std::endl; std::cout << at<double>(m) << std::endl; }

2 1

shared_ptr and
by gast128 22 Dec '06

22 Dec '06

Dear all, I just typed something like this: void Foo(void (I::*pmf)()) { boost::shared_ptr<I> ptr(new I); (ptr->*pmf)(); } but this does not compile. Is there are rationale behind this? I have no experience in ovelroading operator->*, so maybe this question arises from ignorance. Wkr, me

2 2

[date_time] timezone rules for different years
by Stephen Turner 22 Dec '06

22 Dec '06

For my application, I need to be able to get the local time of any UTC time in the last five years in any location. As far as I can see, the date_time library doesn't provide this. The documentation says that date_time_zonespec.csv is "based on data found in the zoneinfo datebase", but whereas the zoneinfo database contains historical information about daylight saving time changes, date_time_zonespec.csv only seems to allow you to specify a single rule for each timezone. And I can't find another mechanism to do it. Am I missing something, or is this capability not present? And if not, is there any plan to add it? Or a workaround? I anticipate that this will become more of a problem when the rules for the U.S. change by several weeks next year. Thanks in advance for any tips, and Happy Christmas, -- Stephen Turner, Cambridge, UK http://homepage.ntlworld.com/adelie/stephen/ "The internet is a reflection of our society. If we do not like what we see, the problem is not to fix the mirror, we have to fix society." (Vint Cerf)

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