- Boost-users - lists.boost.org

multi-array data ownership
by gtsml owevwr 16 May '09

16 May '09

Hi, I want to use multi-array but the original data is coming from, let say, a std::vector<float>. The data is quite big, do I need to copy it into a multi-array? Or maybe I can use a "view" as a proxy on top of the original data and therefore avoid a costly copy? Thanks, Frank

2 2

[accumulators] density: empty values
by Robert Kubrick 16 May '09

16 May '09

I have the following program: #include <iostream> #include <boost/accumulators/accumulators.hpp> #include <boost/accumulators/statistics/stats.hpp> #include <boost/accumulators/statistics/density.hpp> using namespace boost; using namespace boost::accumulators; int main() { typedef iterator_range<std::vector<std::pair<double, double> >::iterator > histogram_type; accumulator_set<double, features<tag::density> > acc(tag::density::num_bins = 20, tag::density::cache_size = 10); // push in some data ... acc(0.1); acc(1.2); acc(2.3); acc(3.4); acc(4.5); acc(5.4); acc(5.5); acc(5.5); acc(10); // Display the results ... histogram_type hist = density(acc); for( int i = 0; i < hist.size(); i++ ) std::cout << "Bin lower bound: " << hist[i].first << ", Value: " << hist[i].second << std::endl; return 0; } Bin values and indexes don't seem to be initialized: $ acc_dist Bin lower bound: 0, Value: 0 Bin lower bound: 0, Value: 0 Bin lower bound: 0, Value: 0 Bin lower bound: 0, Value: 0 Bin lower bound: 0, Value: 0 Bin lower bound: 0, Value: 0 ...

3 5

Range checked variable or class
by Ryan McConnehey 16 May '09

16 May '09

Is there a boost library or utility that can create a variable with a maximum and minimum acceptable value? Ryan

3 3

intrusive::slist, MPL, Sun CC
by Chris Hite 16 May '09

16 May '09

intrusive::slist work with Sun CC? I notice that it uses some MPL. Does MPL generally not work with Sun CC? CC: Sun C++ 5.9 SunOS_sparc Patch 124863-12 2009/04/21 CC -I/development/tango/current/misc/boost/boost_1_39_0/SunOS/include/boost-1_39 -c test.cxx -o test.o test.cxx: Christopher Hite RTS Realtime Systems Software GmbH, Rembrandtstrasse 13, D-60596 Frankfurt am Main T: +49.69.61009.0 / F: +49.69.61009.181 Sitz: Frankfurt am Main - HRB 84467 Amtsgericht Frankfurt am Main Geschäftsführer: Steffen Gemuenden, Igor Sluga www.rtsgroup.net This email and any attachments are for the exclusive and confidential use of the intended recipient. If you are not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, please do not read, distribute or take action in reliance upon this message. If you have received this in error, please notify me immediately by return email and promptly delete this message and its attachments from your computer system. ------------------------------------------------------- #include <boost/intrusive/slist.hpp> using namespace boost::intrusive; struct CalcEntry: public slist_base_hook<none,none,none> {}; void foo(){ typedef slist<CalcEntry,cache_last<true> > CalcList; CalcList _calcList; } ------------------------------------------------------- "/development/tango/current/misc/boost/boost_1_39_0/SunOS/include/boost-1_39/boost/intrusive/slist.hpp", line 121: Error: pointer is not a member of boost::intrusive::detail::generic_hook<boost::intrusive::get_slist_node_algo<void*>, boost::intrusive::default_tag, 1, 2>. "/development/tango/current/misc/boost/boost_1_39_0/SunOS/include/boost-1_39/boost/intrusive/slist.hpp", line 1943: Where: While specializing "boost::intrusive::slist_impl<boost::intrusive::slistopt<boost::intrusive::detail::generic_hook<boost::intrusive::get_slist_node_algo<void*>, boost::intrusive::default_tag, 1, 2>, unsigned, 1, 0, 1>>". "/development/tango/current/misc/boost/boost_1_39_0/SunOS/include/boost-1_39/boost/intrusive/slist.hpp", line 1943: Where: Specialized in boost::intrusive::slist<CalcEntry, boost::intrusive::cache_last<1>, boost::intrusive::none, boost::intrusive::none, boost::intrusive::none, boost::intrusive::none>. "test.cxx", line 9: Where: Specialized in non-template code. "/development/tango/current/misc/boost/boost_1_39_0/SunOS/include/boost-1_39/boost/intrusive/slist.hpp", line 122: Error: const_pointer is not a member of boost::intrusive::detail::generic_hook<boost::intrusive::get_slist_node_algo<void*>, boost::intrusive::default_tag, 1, 2>. "/development/tango/current/misc/boost/boost_1_39_0/SunOS/include/boost-1_39/boost/intrusive/slist.hpp", line 1943: Where: While specializing "boost::intrusive::slist_impl<boost::intrusive::slistopt<boost::intrusive::detail::generic_hook<boost::intrusive::get_slist_node_algo<void*>, boost::intrusive::default_tag, 1, 2>, unsigned, 1, 0, 1>>". "/development/tango/current/misc/boost/boost_1_39_0/SunOS/include/boost-1_39/boost/intrusive/slist.hpp", line 1943: Where: Specialized in boost::intrusive::slist<CalcEntry, boost::intrusive::cache_last<1>, boost::intrusive::none, boost::intrusive::none, boost::intrusive::none, boost::intrusive::none>. "test.cxx", line 9: Where: Specialized in non-template code. "/development/tango/current/misc/boost/boost_1_39_0/SunOS/include/boost-1_39/boost/intrusive/slist.hpp", line 123: Error: iterator_traits is not a member of std. "/development/tango/current/misc/boost/boost_1_39_0/SunOS/include/boost-1_39/boost/intrusive/slist.hpp", line 1943: Where: While specializing "boost::intrusive::slist_impl<boost::intrusive::slistopt<boost::intrusive::detail::generic_hook<boost::intrusive::get_slist_node_algo<void*>, boost::intrusive::default_tag, 1, 2>, unsigned, 1, 0, 1>>". "/development/tango/current/misc/boost/boost_1_39_0/SunOS/include/boost-1_39/boost/intrusive/slist.hpp", line 1943: Where: Specialized in boost::intrusive::slist<CalcEntry, boost::intrusive::cache_last<1>, boost::intrusive::none, boost::intrusive::none, boost::intrusive::none, boost::intrusive::none>. "test.cxx", line 9: Where: Specialized in non-template code. "/development/tango/current/misc/boost/boost_1_39_0/SunOS/include/boost-1_39/boost/intrusive/slist.hpp", line 123: Error: A declaration does not specify a tag or an identifier. ......

3 2

Compile problems with instrusive::slist::push_back
by Johannes Gajdosik 16 May '09

16 May '09

From this piece of code ---------------------------------------- #include <boost/intrusive/slist.hpp> class Node : public boost::intrusive::slist_base_hook<> { public: Node(int x) : x(x) {} int x; }; typedef boost::intrusive::slist<Node> List; int main(int argc,char *argv[]) { List list; Node n1(1234); Node n2(5678); list.push_front(n1); list.push_back(n2); return 0; } ------------------------------------------ I get the following error: johannes@pc1:~/Progs/Components/Boost> g++ IntrusiveTest1.C -Iboost_1_39_0 boost_1_39_0/boost/intrusive/slist.hpp: In member function 'void boost::intrusive::slist_impl<Config>::push_back(typename std::iterator_traits<typename boost::intrusive::detail::eval_if_c<boost::intrusive::slist_impl<Config>::external_value_traits, boost::intrusive::detail::eval_value_traits<typename Config::value_traits>, boost::intrusive::detail::identity<typename Config::value_traits> >::type::pointer>::reference) [with Config = boost::intrusive::slistopt<boost::intrusive::detail::base_hook_traits<Node, boost::intrusive::slist_node_traits<void*>, safe_link, boost::intrusive::default_tag, 2>, long unsigned int, true, false, false>]': IntrusiveTest1.C:16: instantiated from here false>boost_1_39_0/boost/intrusive/slist.hpp:382: error: invalid false>application of 'sizeof' to incomplete type false>'boost::STATIC_ASSERTION_FAILURE<false>' IntrusiveTest1.C:16: false>instantiated from here false>boost_1_39_0/boost/intrusive/slist.hpp:382: error: invalid false>application of 'sizeof' to incomplete type false>'boost::STATIC_ASSERTION_FAILURE<false>' This is boost_1_39_0. I use operating system johannes@pc1:~/Progs/Components/Boost> uname -a Linux pc1 2.6.22.19 #1 PREEMPT Fri Apr 10 00:41:29 CEST 2009 x86_64 AMD Athlon(tm) 64 Processor 3000+ AuthenticAMD GNU/Linux and compiler gcc version 4.3.2 (Gentoo 4.3.2-r3 p1.6, pie-10.1.5) I cannot understand, why list.push_front(n1) compiles, while list.push_back(n2) fails to compile. Thanks in advance for your help. Yours, Johannes Gajdosik

3 2

Re: [Boost-users] iterators must go
by John Dlugosz 15 May '09

15 May '09

> Date: Wed, 13 May 2009 02:18:07 -0400 > From: Scott McMurray <me22.ca+boost(a)gmail.com> > Subject: Re: [Boost-users] iterators must go > To: boost-users(a)lists.boost.org > Message-ID: > <fa28b9250905122318s3460e1dam5d624160d95ced5(a)mail.gmail.com> > Content-Type: text/plain; charset=UTF-8 > > On Sun, May 10, 2009 at 09:24, Neal Becker <ndbecker2(a)gmail.com> wrote: > > Interesting presentation: > > > > http://www.boostcon.com/site- > > media/var/sphene/sphwiki/attachment/2009/05/08/iterators-must-go.pdf > > > > Very persuasive, but it's careful to touch only the examples that look > nice. Note, for example, that every range was a whole container. > > The three-iterators part was somewhat handwaved-over as well. Take > this bit of current code, for example: > > auto i = find(c.begin(), c.end(), some_pred()); > rotate(c.begin(), i, c.end()); > > How do you do that nicely with ranges, when he has find returning a > range? (Since right now, it implicitly actually returns 2 ranges.) > > And how does insertion work? Do we still need to keep the iterators > around for insertion position? > > I'd love to see the finicky bits worked out, though, since I do like > the idea. > > ~ Scott Any place you really want a single iterator, a range of one value would work. For appending or streaming out, you really want the concept of an open-ended range. --John TradeStation Group, Inc. is a publicly-traded holding company (NASDAQ GS: TRAD) of three operating subsidiaries, TradeStation Securities, Inc. (Member NYSE, FINRA, SIPC and NFA), TradeStation Technologies, Inc., a trading software and subscription company, and TradeStation Europe Limited, a United Kingdom, FSA-authorized introducing brokerage firm. None of these companies provides trading or investment advice, recommendations or endorsements of any kind. The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from any computer.

4 3

Re: [Boost-users] iterators must go
by John Dlugosz 15 May '09

15 May '09

> I think a ranges can be used as insertion positions. The element could > be inserted just before or after the start of the range. The details > have to be worked out, like if it's before or after, and if it's > before, > if the range grows to include the element. I thought that Boost has ranges for some time, and the upcoming C++ standard incorporates them. So, haven't the details *been* worked out? --John TradeStation Group, Inc. is a publicly-traded holding company (NASDAQ GS: TRAD) of three operating subsidiaries, TradeStation Securities, Inc. (Member NYSE, FINRA, SIPC and NFA), TradeStation Technologies, Inc., a trading software and subscription company, and TradeStation Europe Limited, a United Kingdom, FSA-authorized introducing brokerage firm. None of these companies provides trading or investment advice, recommendations or endorsements of any kind. The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from any computer.

2 1

Boost.Regex 1.39.0: Crash in boost::sub_match::str()
by Peter Klotz 15 May '09

15 May '09

The program below crashes when compiled and executed in Windows using MSVC8. The crash happens in boost::sub_match::str(). It seems that the internal structure m_subs gets somehow corrupted. The crash disappears when passing the const reference fileName instead of it->path().filename(). I have no idea why this should make any difference. The program expects a directory on the command line. Just put an empty file called "AAA-0.txt" in this directory. Any help is appreciated. Regards, Peter. #include <iostream> #include <boost/filesystem/path.hpp> #include <boost/filesystem/convenience.hpp> #include <boost/regex.hpp> int main(int argc, char** argv) { try { if (argc==2) { const boost::filesystem::path p(argv[1]); const boost::regex regEx("^([A-Za-z0-9_]+)-(.*)\\.txt$"); boost::smatch match; for (boost::filesystem::directory_iterator it(p);it!=boost::filesystem::directory_iterator();++it) { const std::string& fileName=it->path().filename(); if (boost::regex_match(it->path().filename(),match,regEx)) // <- using fileName makes the crash disappear { const std::string projectName=match.str(1); // <- here it crashes } } // for return 0; } } catch (const std::exception& e) { std::cout << e.what() << std::endl; } return 1; }

3 2

Re: [Boost-users] How to print from C++ to the same stream as Python's 'print' does?
by John Dlugosz 15 May '09

15 May '09

> Date: Wed, 13 May 2009 06:19:20 -0500 > From: Early Ehlinger <earlye(a)gmail.com> > Subject: Re: [Boost-users] (Boost.Python) How to print from C++ to the > same stream as Python's 'print' does? > To: boost-users(a)lists.boost.org > Message-ID: > <5922b0d30905130419x3d030f24s948b15cfd42d91f(a)mail.gmail.com> > Content-Type: text/plain; charset="iso-8859-1" > Can you ask Python to give you the underlying OS or C standard library handle? Then you can create a C++ ofstream around that. --John TradeStation Group, Inc. is a publicly-traded holding company (NASDAQ GS: TRAD) of three operating subsidiaries, TradeStation Securities, Inc. (Member NYSE, FINRA, SIPC and NFA), TradeStation Technologies, Inc., a trading software and subscription company, and TradeStation Europe Limited, a United Kingdom, FSA-authorized introducing brokerage firm. None of these companies provides trading or investment advice, recommendations or endorsements of any kind. The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from any computer.

1 0

Re: [Boost-users] thread-safe ref-counted objects
by John Dlugosz 15 May '09

15 May '09

> Date: Tue, 12 May 2009 19:17:47 +0300 > From: Igor R <boost.lists(a)gmail.com> > Subject: [Boost-users] [boost-users][signals2] thread-safe > disconnection for intrusively ref-counted objects > To: boost-users(a)lists.boost.org > Message-ID: > <cfe0a3cf0905120917u55751463i566d0e96b420c011(a)mail.gmail.com> > Content-Type: text/plain; charset=UTF-8 > > Is there any trick or customization that would allow the subj? > I mean the following situation: > I have a set of reference-counting pointer classes that are designed specifically for cross-thread use. It *expects* to be incremented and decremented on different threads at the same time. <http://github.com/jdlugosz/repertoire> <http://www.dlugosz.com/Repertoire/refman/Classics/Smart%20Pointers%20Ov erview.html#toptop> probably doesn't tell you anything you don't already know, since it was just assumed that everything would be thread-safe and doesn't consider that an "issue". <http://www.dlugosz.com/Repertoire/refman/Classics/handle_guide.html#thr eads> goes over the thread features. Feel free to abscond with or borrow any of the code or ideas therein, if it helps you. --John (sorry about the footer; not my choice) TradeStation Group, Inc. is a publicly-traded holding company (NASDAQ GS: TRAD) of three operating subsidiaries, TradeStation Securities, Inc. (Member NYSE, FINRA, SIPC and NFA), TradeStation Technologies, Inc., a trading software and subscription company, and TradeStation Europe Limited, a United Kingdom, FSA-authorized introducing brokerage firm. None of these companies provides trading or investment advice, recommendations or endorsements of any kind. The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from any computer.

1 0