- Boost-users - lists.boost.org

Re: [Boost-users] multi_array warning with vs2005
by John Dlugosz 07 May '09

07 May '09

> Date: Thu, 7 May 2009 12:42:09 +0100 > From: "Hicham Mouline" <hicham(a)mouline.org> > Subject: [Boost-users] multi_array warning with vs2005 > To: <boost-users(a)lists.boost.org> > Message-ID: <002701c9cf08$dbefe5b0$93cfb110$@org> > Content-Type: text/plain; charset="us-ascii" > > Hello, > > I get these warnings : ... > Am I supposed to disable the warning explicitly in my user code? Or > should > the warning disable be pushed/pop in boost multi_array? > The warnings are warning against using features that are in fact standard, in favor of using something that may be non-standard but more robust against misuse and possibly slower. So it is appropriate to disable them on code that you are not maintaining, but are using from somewhere else. --John (sorry about the footer; it is not my idea) 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.

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boost.regex and perl expressions
by Dmitriy Lyfar 07 May '09

07 May '09

Hello, I'm trying to port my old regex code from pcre to boost.regex. There is a sample: void print_captures(const std::string& regx, const std::string& text) { boost::regex e(regx, boost::regex::perl); boost::smatch what; std::cout << "Expression: \"" << regx << "\"\n"; std::cout << "Text: \"" << text << "\"\n"; if(boost::regex_search(text, what, e, boost::match_extra)) { unsigned i, j; for(i = 0; i < what.size(); ++i) std::cout << " $" << i << " = \"" << what[i] << "\"\n"; } else { std::cout << "** No Match found **\n"; } } int main(int , char* []) { print_captures("http:\\/\\/.*\\.(.*\\.cn)", "\n\nhttp:// www.sc500.cn/hi/mom! \ \n test http:// rdfhr.zeyulariy.cn \ \n test http:// adtgr.zeytlariy.cn \n \ http://super.test.com"); return 0; } boost::regex output is: $0 = "http://www.sc500.cn/hi/mom! test http:// rdfhr.zeyulariy.cn test http:// adtgr.zeytlariy.cn" $1 = "zeytlariy.cn" Whereas where I'm using pcre I got following substrings (except full match): sc500.cn zeytlariy.cn zeyulariy.cn which is expected. So I'm confused about how perl expressions are worked. How can I get the same results using boost instead of pcre? Thank you.

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[1.38.0][Serialization] [SunOS] Build ok but crashes when runing
by Jo anneChiang 07 May '09

07 May '09

The following is my configuration: 1. uname -a : SunOs xxx 5.10 Generic_127127-11 sun4u sparc SUNW,Sun-Fire-V215 2. user-config.jam: using sun : 5.10 : my-path-to-sunwspro-CC : <stdlib>sun-stlport <cxxflags>"-library=stlport4 -xtartget=ultra2 -xarch=v9" <linkflags>"=library=stlport4 -xtarget=ultra2 -xarch=v9" 3. running : bjam --with-serialization OK and the static library can be sucessfully built. However when it linked to my program and performs serialization, a segmentation fault occurs. Actually, I also found many among the bundled unit-tests are crashed as well, so supposedly the root cause is not my program logic. (the tests result in 3 kinds of crashes: stream error, segmentation fault and Illegal Instruction) So I'd like to consult if any of you have successfully pass all the unit-tests of boost.serialization under Sun studio CC with stlport4 ? Is there any glue or exprerience that can be provided here ? Or it tends to be a bug ? Thanks much, /maverick _______________________________________ ��ӭʹ�ó��Ż�� http://cn.mail.yahoo.com

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[iostreams] why doesn't file_sink flush?
by Andrew Schweitzer 07 May '09

07 May '09

I'm trying to chain debugging logs together with a filtering_ostream. I've discovered that I need to call flush() on the filtering_ostream to get characters to appear in console in a timely fashion. This flush() call doesn't causes the file to be flushed. After some digging, I've discovered that the boost::iostreams::file_sink doesn't have the flushable_tag (or implement flush). std::fstream does have a flush function, and if I use it directly (not chained into a filtering_ostream), the flush call works as you might expect. So what is the appropriate way of implementing this? Chaining multiple logs together seems like a great way to use iostreams library. And out of curiosity, why doesn't file_sink implement flushable_tag? Here is the code I was using: #include <boost/iostreams/stream.hpp> #include <boost/iostreams/device/file.hpp> #include <boost/iostreams/stream.hpp> #include <boost/iostreams/tee.hpp> #include <boost/iostreams/filtering_stream.hpp> #include <boost/iostreams/categories.hpp> #include <boost/iostreams/concepts.hpp> #include <boost/thread.hpp> #include <boost/thread/xtime.hpp> #include <iostream> int main(int argc, char** argv) { using namespace std; using namespace boost; using namespace boost::iostreams; filtering_ostream fo; file_sink fsink("out.txt"); tee_filter<file_sink> tee_fsink(fsink); fo.push(tee_fsink); fo.push(cout); int i = 0; while(true) { fo << i << " "; //without this, I don't see "one print / second" //with it, I only see them on cout, but not in out.txt. fo.flush(); i++; boost::xtime xt; boost::xtime_get(&xt, boost::TIME_UTC); xt.sec += 1; boost::thread::sleep(xt); } return 0; } tx Andy

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Xpressive, symantic actions and combination enumeration
by Lee Simpson 07 May '09

07 May '09

Hi, First let me say. Awesome library and thanks for releasing it to the world. I'm looking for a way to apply all the currently queued semantic actions _without_ turning off backtracking. So, as the manual suggests, keep manages to apply the queued actions but it also turns off backtracking. The reason I am doing this is simple though unusual. I am trying to determine every possible match for a given input sequence, recording and ranking each one individually. A simple (contrived) example would be... input = "abcd"; expression = apply(+alpha[save_lhs(_)] >> +alpha[save_rhs(_)] >> eos) Ideally, applying the expression would yield the following combinations for 'lhs' and 'rhs' 1. "a","bcd" 2. "ab","cd" 3. "abc","d" The best solution I have come up with has an unacceptable time complexity. In short, the solution is to have a match assertion at the end of the expression which only succeeds on the nth try. I then use a while loop, executing regex_match with increasing values of 'n' until no more matches are found. Of course the problem with this solution is that the time complexity goes to n!+(n-1)!+(n-2)!... Any ideas?

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[rerepost][threads] recursive shared_mutex
by joaquin＠tid.es 06 May '09

06 May '09

I promise this is the last time I repost this; if I got no response I'll go and try somewhere else :-/ thanks for your patience. As the docs do not explicitly say otherwise, I guess I must assume that boost::shared_mutex is not recursive with respect to unique ownership, that is, the following behavior ensues: shared_mutex mutex; lock_guard<shared_mutex> lock1(mutex); lock_guard<shared_mutex> lock2(mutex); // DEADLOCK Is this so? In case boost::shared_mutex is indeed non-recursive, I've read the following assertion on Hinnant's paper N2406 (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2406.html ): "A recursive shared mutex could be built upon shared_mutex if desired, but this is not proposed." Does anyone has a reference on how to construct a recursive shared_mutex from a non-recursive one? Thank you, Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

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[optional]
by dariomt＠gmail.com 06 May '09

06 May '09

Hi list, In 'classic' C++ style I have signalled optional parameters in a function with pointers that might be null (I wouldn't like to create overloads for all possible combination of existing and non-existing parameters) e.g. // p1 is mandatory, p2, p3 and p4 are optional void f(const Param1& p1, const Param2* p2, const Param3* p3, const Param4* p4); And call it Param1p1; Param2 p2; Param4 p4; f(p1, &p2, 0, &p4); I thought I could use boost::optional like this void f(const Param1& p1, const boost::optional<Param2> & p2, const boost::optional<Param3> p3, const boost::optional<Param4> & p4); And call it Param1p1; Param2 p2; Param4 p4; f(p1, boost::optional<Param2>(p2), boost::optional<Param3>(), boost::optional<Param4>(p4) ); but I haven't seen this usage in the examples in the documentation of Boost.Optional. Is this usage correct? Are there any hidden drawbacks with this approach? TIA

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[Boost]bootsrap command not working.
by Jaiswal, Usha [OS-IE] 06 May '09

06 May '09

Hi, I need to build boost libraries for 64 bit platform for this I am using "bootstrap " command at command prompt but message is coming "bootstrap is not recognized as internal or external command, operable or batch file" What is the right way to use bootstrap command or if there is any bootstrap.bat or exe file, where is it present?? Thanks in advance for your help. -Usha.

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Re: [Boost-users] Stepping into a boost::function while debugging
by Neil Hunt 06 May '09

06 May '09

> > > I just hit step into until I get to familiar code. ... > > In Christ, > Steven Watanabe > > Ha! Somehow I think, Steven, there is no code which with you are unfamiliar. And I expect that even includes code you have never seen before. Neil

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[BGL] citing the Boost Graph Library
by Alejandro Marcos Aragón 06 May '09

06 May '09

Can anyone point me how to cite the Boost Graph Library in a paper? Is there any information in the boost website? Thank you all, Alejandro Aragón

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