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Re: [boost] [Boost][GSoC] Checks and hashes proposal
by Pierre Talbot 08 Apr '11

08 Apr '11

Well, I just modify the "specifics" because I don't have time to re-structured all the proposal. Thank you for those precisions. I join the skeleton library I coded few days ago. EDIT : I couldn't join it because the message exceed 75KB, so I uploaded it, please download the file with the following link : http://www.mediafire.com/file/0odobkg11p2uvda/checks_hashes_project.zip 2011/4/8 Pierre Talbot <pierre.talbot.6114(a)herslibramont.be> > Well, I just modify the "specifics" because I don't have time to > re-structured all the proposal. > > Thank you for those precisions. > > I join the skeleton library I coded few days ago. > > > 2011/4/8 Scott McMurray <me22.ca+boost(a)gmail.com> > >> On Fri, Apr 8, 2011 at 07:19, Pierre Talbot >> <pierre.talbot.6114(a)herslibramont.be> wrote: >> > >> > I wrote my proposal and posted it on the GSoC website, any feedbacks or >> > comments are welcomed. >> > >> >> You mix four distinct things in one: ISBN/EAN/VISA/etc, for catching >> human-entry errors; hash functions as in hash tables, which only care >> about distribution; checksums like CRC32, for catching data >> transmission errors; and cryptographic hash functions, the only ones >> useful against malicious adversaries. >> >> The summer is short, and the boost process is long. I'd encourage you >> to look only at the first category. As you mention, it's the one with >> the fewest alternative libraries, so you won't have to prove >> competitive performance and such, and there are no real security >> issues to deal with. >> >> Also, I'd like to see some sketches of interfaces. What do you expect >> user code to look like? >> >> A few specifics: >> >> "This kind of drama situation can be avoided by storing encrypted >> passwords." >> Encrypted means cyphers, not hashes. You want digests or MACs of >> passwords, not something reversible. >> >> "Write, test and document the hash functions MD5 and SHA-1 256 bits." >> There's no such thing as 256-bit SHA-1. Do you mean SHA-256, from >> "SHA-2"? >> >> Also, MD5, SHA-1, and SHA-2 are implemented in my hash library: >> <http://svn.boost.org/svn/boost/sandbox/hash/boost/hash/md5.hpp> >> <http://svn.boost.org/svn/boost/sandbox/hash/boost/hash/sha1.hpp> >> <http://svn.boost.org/svn/boost/sandbox/hash/boost/hash/sha2.hpp> >> >> ~ Scott >> _______________________________________________ >> Unsubscribe & other changes: >> http://lists.boost.org/mailman/listinfo.cgi/boost >> > >

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[Boost][GSoC] Checks and hashes proposal
by Pierre Talbot 08 Apr '11

08 Apr '11

Hello, I wrote my proposal and posted it on the GSoC website, any feedbacks or comments are welcomed. http://www.google-melange.com/gsoc/proposal/review/google/gsoc2011/trademar… Thank you. Pierre Talbot.

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[gsoc] JSON?
by Rene Rivera 08 Apr '11

08 Apr '11

Students and other interested parties, I would love it if there was a Boost quality JSON data parser, and optional printer, library. Currently I use one based on Spirit1 which has many drawbacks. I've been waiting for someone in the Spirit team, i.e. Joel, to have some mythical free time and inclination to write such a thing. But I'd really love one sooner, rather than later. Having one that is good and based on the latest Spirit would be wonderful. I can't say I have the time to mentor such a project. Hence this is just a though ;-) -- -- Grafik - Don't Assume Anything -- Redshift Software, Inc. - http://redshift-software.com -- rrivera/acm.org (msn) - grafik/redshift-software.com -- 102708583/icq - grafikrobot/aim,yahoo,skype,efnet,gmail

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[GSoC] NLP Idea for GSoC 2011 project
by Sarma Tangirala 08 Apr '11

08 Apr '11

Hello list, I have worked with Boost on my projects but haven't really thought of using C++ as a language for NLP. The NLP that I have done is on Python and Java, for their built-in string methods. I don't know if this is inexperience or ignorance, but does C++ work well for NLP? I was thinking of having a GSoC project that is devoted to provide support for NLP. I mean like the kind that looks real easy on python. Also, I was looking at some C++ code using Boost/tokenizer.hpp that tokenized some text and it looked a bit scary. Any suggestions or advice? -- Regards, Sarma Tangirala, Junior - Class of 2012, Department of Information Science and Technology, College of Engineering Guindy - Anna University

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[con] Links to BoostCon2009, session material
by Joachim Faulhaber 08 Apr '11

08 Apr '11

Hi, I tried to refer to some session material from BoostCon2009 under the link where it was available once: http://www.boostcon.org/community/wiki/show/Start/HandsOnCXX0x/ This link is broken, so I searched the new conference site: http://boostcon.boost.org/ Unfortunately I didn't find it there either. Are those session materials available somewhere else? Thanks, Joachim -- Interval Container Library [Boost.Icl] http://www.joachim-faulhaber.de

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lp solver GSOC proposal
by Chad Seibert 08 Apr '11

08 Apr '11

Hi, Just letting the community know that a draft version of my lp solver GSOC proposal can be found here: http://www.google-melange.com/gsoc/proposal/review/google/gsoc2011/chadjsei… Any feedback would be greatly appreciated! Chad Seibert

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Re: [boost] [Boost-users] Writing large binary files with boost gzip
by Steven Watanabe 08 Apr '11

08 Apr '11

AMDG On 04/07/2011 05:39 PM, Anders Knudby wrote: > Many thanks for the quick response. And apologies for being a total newbie, > but how do I close the stream (and how do I check that it has been closed)? > With normal iostreams I would just write "out.close();", out being the name > of the stream. But that doesn't seem to be the way to do it for > filtering_iostreams?!? It should be closed when it goes out of scope or when you call pop. > And I would think it would close when it goes out of > scope, but I haven't checked. Yes, the stream is closed when it goes out of scope. > Any help appreciated. I'm pleased it worked > for you on Linux, but I'm largely stuck with Windows for the time being... > I can try it on Windows, but it'll take a little bit, as I don't have zlib installed, right now. In Christ, Steven Watanabe

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[phoenix] Functions and function pointers
by Lorenzo Caminiti 07 Apr '11

07 Apr '11

Hello all, How do I call functions and function pointers from within a Boost.Phoenix lambda function? For example: #include <boost/spirit/include/phoenix.hpp> #include <iostream> #include <vector> #include <algorithm> #include <cassert> #define N 1e4 #define S N * 1e2 const double& id(const double& x) { return x; } int main() { using boost::phoenix::ref; using boost::phoenix::arg_names::_1; double sum = 0.0; int factor = 1; const double& (*f)(const double&) = &id; std::vector<double> v(S); std::fill(v.begin(), v.end(), 1.0); for (size_t n = 0; n < N; ++n) { std::for_each(v.begin(), v.end(), ( ref(sum) += id(factor * f(_1)) // <<<<<<<<<<<<<< how do I call id(...) and f(...)? )); } std::cout << sum << std::endl; assert(sum == N * S); return 0; } Thank you very much. -- Lorenzo

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[optional] Incorrect example
by Ahmed Charles 07 Apr '11

07 Apr '11

http://www.boost.org/doc/libs/1_46_1/libs/optional/doc/html/boost_optional/… int x = 1 ; int& rx = x ; optional<int&> ora ; optional<int&> orb(x) ; ora = orb ; // now 'ora' is bound to 'x' through 'rx' *ora = 2 ; // Changes value of 'x' through ' ora'assert(x==2); Either the comment on the fifth line is wrong or the fourth line should construct from rx rather than x.

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[context] future design
by Oliver Kowalke 07 Apr '11

07 Apr '11

Hello, modifications I've made: - context: - stack unwinding: bool context::finished() const indicating that the called function has finished -> stack already unwinded boid context::unwind_stack() jump back into context and throw a special exception -> stack will be unwinded (requires that no try/catch(...) was used) - context is now moveable - is not a template == the stack type is only passed/known in the templated ctor - the function to be called by the context is not saved on top of the stack - exceptions replaced by assertions / exceptions.hpp removed - fcontext_t used as default implementation; ucontext_t only fallback for platforms not supported by fcontext_t - on Windows Win Fiber API is used as default - protected stack: - keyword explicit added to ctor - public static members min_stacksize, max_stacksize, default_stacksize - fcontext_t renamed to boost_fcontext_t, boost_fcontext_get(), boost_fcontext_set(), boost_fcontext_jump(), boost_fcontext_make() - i386 ASM preserves SSE2 control/status word - x86 ASM uses indirect jump for boost_fcontext_set() and boost_fcontext_jump() code is available at git://git.gitorious.org/boost-dev/boost-dev.git branch context-dev. @Vicente: could you check your SPAM filter , please (I've send several eMails to you). best regards, Oliver

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