December 2004 - Boost - lists.preview.boost.org

Slow boost.org!
by David Abrahams 02 Dec '04

02 Dec '04

Has anyone else noticed the website being exceedingly slow? Maybe it's time, after all, to move its hosting to osl.iu.edu. -- Dave Abrahams Boost Consulting http://www.boost-consulting.com

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[logo] Boost/++ stripes
by Rene Rivera 02 Dec '04

02 Dec '04

-- -- Grafik - Don't Assume Anything -- Redshift Software, Inc. - http://redshift-software.com -- rrivera/acm.org - grafik/redshift-software.com - 102708583/icq

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[gui] (Was GUI validation (was GUI Library Proposal for a Proposal))
by Andy Little 02 Dec '04

02 Dec '04

"Eugene Lazutkin" <eugene(a)yymap.com> wrote > Just to revive discussion about GUI allow me to offer my 2c worth. (Sorry > for big post). > > Let's split GUI into two parts: G (2D graphics) and UI (user interface). > :-) > G can be used without UI: printing, generation of metafiles (e.g., > Postscript, SVG) or pixmaps/bitmaps. UI can be used without G, if only > stock > components are used: simple dialog boxes. The idea of separating GUI into various conceptual areas seems good to me, However I would have thought that the graphics primitives part must be designed first. Graphically a window should be part of a graphical system that deals with graphical transforms, which also opens the way for non window elements to be manipulated generically... From the point of view of instantiating a graphical entity it should be possible to know where and how big it is required and in relation to what, IOW a coordinate system. > Now we want to make all these components as light-weight as possible for > performance reasons. Ideally they should be mapped 1-to-1 to facilities of > underlying platform, while preserving platform independence. I don't think > it is productive to walk original Java way and implement all widgets in > terms of graphics primitives, Drawing the various parts of a window, eg its border is fundamentally a graphics operation too. Should it not be possible to implement a gui on a simple operating system such as DOS or other simple embedded os that has no concept of high level graphics operations? There needs to be some underlying abstraction which does not rely on an operating system for its existence. > First order of business is 2D geometry. Following stuff is required: > > 1) Point. Simple 2D entity with X and Y components. In real life at least > two versions are required: integral (screen coordinates are integral) and > floating point (for precise calculations). I agree that this humble 2D entity or family is the first graphics primitive that needs some resolution. Because they are used in so many ways a general purpose xy_pair type is the option I have currently been using. ( Being the 2D equivalent of an int or a float) Operations addition, subtraction, multiplication and division by a numeric. Perhaps this whole point/size issue shows a lack of clarity regarding the overall coordinate-system. A 'point' describes a relationship between one entity IN another, suggesting a graph edge relation. A 'size' is a property OF an entity only. The observation that the difference between a 'Point' and a 'Size' could be used to discriminate functions is valid, but when used in a context ( ie by finding the best model of the system)there is less need for pivotting (overload resolution) on particular types. As another example... if screen units were one type and window units were some other type eg millimeters or whatever, then conversion between these types could be achieved automatically rather than requiring a LPtoDp function etc. However this again may not be necessary if the framework fits correctly eg using a transform matrix as a edge property of a graph of the relationship between graphical entities. > Additional consideration: point should play well with native > platform-dependent coordinate. I dont view things quite this way. This is surely a classic case where the concept (the What) should be considered before any particular implementation . My criticism of current libraries in this discussion is that they have basically started with a particular implementation and tried to abstract from that. IOW each implementation should be a 'workaround' for the ideal approach which provides the standard from which to work. > Additional consideration: region should play well with native > platform-dependent regions. Because region is relatively complex object, > which is used mostly in specific context, it may make sense to implement > it > as a wrapper around native region. I also think it would be necessary to work out the mechanics of regions first, else one gets into implementation problems again. If the goal is platform independence then as well as reuse, it would need to be possible to build the mechanics from scratch. > 5) Transformation matrix. In 2D case it can be implemented as 3x3 matrix > or > (to conserve cycles and spaces) as 2x2 matrix + offset vector (6 values > total). Usually it doesn't make any sense to use integer matrix. > Algorithms > to be implemented: addition, multiplication. It is beneficial to have > construction from offset vector, rotation angle, mapping from rectangle to > rectangle (with and without preserving aspect ratio) and so on. More > complex > algorithms are practical as well like "zoom around given point". This relates to the overall coordinate system. The overall graph of spatial relationships between windows also can benefit by using transform matrix 'edges'. This also provides a clearer framework. IOW when 'moving' or 'sizing' a graphics entity (eg window) there is a more obvious answer to the question " in relation to what?" Objects representing transforms seem to be a good way to go. > Well, what are your thoughts? Discussions of UI are recurrent event in > Boost. I saw several proposals for 2D geometry in this mail list. Authors > of > several GUI toolkits are frequent visitors here. Are we ripe already? Thanks... There is a lot more interesting stuff in your post and I like the overall tone.Would it be an idea to use the boost wiki to further the discussion? regards Andy Little

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RE: [boost] Re: Logo design
by Stefan Seefeld 02 Dec '04

02 Dec '04

> From: David Abrahams [mailto:dave@boost-consulting.com] > "Aaron W. LaFramboise" <aaronrabiddog51(a)aaronwl.com> writes: > > > David Abrahams wrote: > > > >> http://www.luannocracy.com/logo.ppt > > > > I don't have PowerPoint. Is there a free reader availible? > > Alternately, would it be possible to rewrite this document > as a PDF or > > something? > > I tried, but it doesn't render quite the same (the vapor trails in > slides 2,3,4 and 6 are off). Anyway, here's what you get: > > http://www.luannocracy.com/logo.pdf FWIW, a wonderful free tool to draw vector graphics is inkscape (http://inkscape.org/) It can save as (scalable) vector graphic or export to raster formats. You may give it a try. Regards, Stefan

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[logo] boost/c++
by Rene Rivera 02 Dec '04

02 Dec '04

-- -- Grafik - Don't Assume Anything -- Redshift Software, Inc. - http://redshift-software.com -- rrivera/acm.org - grafik/redshift-software.com - 102708583/icq

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RE: [boost] Thread: Why is my prog aborting after 283 or so threads?
by Tim Laplaca 02 Dec '04

02 Dec '04

Caleb Epstein wrote: > You can make a thread non-joinable, in which case it will > automatically clean up after itself, by deleting the heap-allocated > thread objects you create. The thread will continue to run, but it > will become "detached" and you won't face this resource issue on > thread exit. I would have never thought of that, sounds dangerous! I tried it and it seems to work though. Is that pretty safe? Specifically, I'm spawning my threads like this: boost::thread *ptr = thrds.create_thread(boost::bind (threadfunc, totalthreads, xx+1)); delete ptr; (where thrds is a thread group) My sample prog has made over 300,000 threads so far with this method, so it seems pretty stable. Tim

3 2

Suggested extension to the preprocessor library
by Ryan Saunders 02 Dec '04

02 Dec '04

Hi, I've been using the preprocessor library quite extensively in my code, and have a suggested addition to it. I use the BOOST_PP_ENUM_XXX macros for rapidly creating lists of identical template parameters. For example, instead of template <typename T0, typename T1, typename T2, typename T3> I can just use template <ENUM_PARAMS(3, typename T)> I notice that there's also a "binary" version that takes two parts and suffixes the count onto each part. The problem I'm faced with is that I'm trying to construct parameter lists to other templates, but the actual parameters are embedded typedefs in the enumerated parameters. I know that was dense -- here's an example: typedef typename meta_func< typename T0::inner_type, typename T1::inner_type, typename T2::inner_type>::type; I don't see a way to do this with any of the ENUM_XXX macros. Maybe something like ENUM_SPLIT_PARAMS(COUNT, PREF, SUFF) that would generate PREF ## n ## SUFF? Thanks, Ryan

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Re: [boost] Re: Re: [multi_index] announce: serialization support
by JOAQUIN LOPEZ MU?Z 01 Dec '04

01 Dec '04

----- Mensaje original ----- De: Robert Ramey <ramey(a)rrsd.com> Fecha: Miércoles, Diciembre 1, 2004 10:15 pm Asunto: [boost] Re: Re: [multi_index] announce: serialization support [snip] > If you guarentee that the container itself is always serialized > before your > indices, then de-serialization of the indices would automatically > be reduced > to providing the original (tracked) pointer. In such a case, I > would think > the whole isse would never appear and that the implementation > would be very > straight forward. > I think this is not correct (but I'd like to be proven wrong, that'd mean I could simplify my code.) Consider this: struct foo { std::list<std::string> cont; std::string* pos; // pos points to an element of cont private: friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int) { ar&cont; // before pos, as you suggest ar&pos; } }; My thesis is that loading a foo will get it wrong --pos won't be pointing to an element of cont, but rather to some random address in stack memory. I'll check it out on my compiler tomorrow, but I was already through this when designing multi_index serialization. See my point now? Am I missing something? Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

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[multi_index] announce: serialization support
by Joaquín Mª López Muñoz 01 Dec '04

01 Dec '04

Hi, I've just uploaded an upgrade of Boost.MultiIndex that provides serialization support at: http://groups.yahoo.com/group/boost/files/multi_index_120104.zip Docs are not yet fully upgraded, but there's some material on serialization support on the advanced topics page, plus a test case. I'd be grateful if those interested in Boost.MultiIndex can give this a try, and report about problems, missing features, improvements, etc. The implementation is a little complex, so some source code reviewing would be appreciated. If no major objections are risen, I'll commit this to the CVS in a few days. Oh, and kudos to Robert for bringing in such a powerful library as Boost.Serialization! Thank you, Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

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Re: [boost] Re: Logos - Last Minute Change of Heart
by JOAQUIN LOPEZ MU?Z 01 Dec '04

01 Dec '04

----- Mensaje original ----- De: Jonathan Turkanis <technews(a)kangaroologic.com> Fecha: Lunes, Noviembre 29, 2004 0:28 am Asunto: [boost] Re: Logos - Last Minute Change of Heart > > "Peter Petrov" <ppetrov(a)ppetrov.com> wrote in message > news:loom.20041129T000540-994@post.gmane.org... > > JOAQUIN LOPEZ MU?Z <joaquin <at> tid.es> writes: > > > > > > Why don't you try removing the distant parts of the circles > > > > surrounding the + > > > > signs (so that they look more like C's, rather than O's). > > > > ... I played a little with your image and removed them. > > See the result, I think it looks better: > > > > http://www.ppetrov.com/temp/png00027pp.png > > I agree that this is better. How about trying just a single "C", > about twice as > thick as the current ones? > Like the attached example? If any of this gains your heart, please feel free to upload it on the Wiki. Gotta go to bed, very late in the night here in Spain. G'nite folks, Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

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MPL Book: Preprocessor Appendix
by Jody Hagins 01 Dec '04

01 Dec '04

FWIW, I have already preordered the book. However, I just read "Appendix A" (a.k.a Intro to Boost.Preprocessor) and if the book comes anywhere close to explaining MPL like the appendix explained PP, then I am ready to spend Christmas vacation outside on the porch reading the book (yes, I live in the south, where, for the most part, shorts and Christmas coexist quite nicely). Nice job! I had previously tried to read the PP docs, but first impressions found the initial hump just way too time consuming to even give it much effort. However, the intro is a wonderful start for anyone (though I still wish there was more). I feel like I have had a peak at the man behind the curtain, and it's not so much voodoo (though I am sure the implementation is quite formidable). Anyway, thanks for the very well written doc, and here's hoping that the book makes it to press on the new date (Dec 17, 2004).

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iterator facade derived question
by Israel Fdez. Cabrera 01 Dec '04

01 Dec '04

Hi all, I had a boost::iterator_facade derived iterator implemented as follow: class ole_directory_iterator : public boost::iterator_facade< POLE::ole_directory_iterator, POLE::path, boost::forward_traversal_tag> { public://Interface enum { Ok = 0, NotOk }; bool good() { return (this->m_result == Ok); } //Constructors ole_directory_iterator() : m_storage(0) { this->m_dirlist.clear(); this->m_current = -1; this->m_result = Ok; } ole_directory_iterator(const std::string& a_filename); //Destructor ~ole_directory_iterator() { m_dirlist.clear(); } private://Implementation friend class boost::iterator_core_access; void Init(); void increment() { if ((this->m_current + 1) >= this->m_dirlist.size()) { this->m_current = -1; return; } ++this->m_current; } bool equal(const ole_directory_iterator& a_iter) const { if ((a_iter.m_current == -1) && (this->m_current == a_iter.m_current) && (a_iter.m_storage == 0)) { return true; } return ((this->m_current == a_iter.m_current) && (this->m_storage == a_iter.m_storage)); } POLE::path& dereference() const { if (this->m_current != -1) { POLE::path& _path = (POLE::path&)this->m_dirlist[this->m_current]; return _path; } return POLE::path(0, ""); } private://Data Members short m_result; std::vector<POLE::path> m_dirlist; long m_current; Storage* m_storage; };//ole_directory_iterator when I write the following code: POLE::ole_directory_iterator _it(argv[1]); POLE::ole_directory_iterator _endIt(); for (; _it != _endIt; ++_it) { POLE::path _path = *_it; } I get the following error with MSVC 7.1: c:\...\pole++.cpp(20): error C2784: 'detail::enable_if_interoperable<Derived1,Derived2,mpl::apply2<boost::detail::always_bool2,Derived1,Derived2>::type>::type boost::operator !=(const boost::iterator_facade<Derived1,V1,TC1,R1,D1> &,const boost::iterator_facade<Derived2,V2,TC2,R2,D2> &)' : could not deduce template argument for 'const boost::iterator_facade<Derived,Value,CategoryOrTraversal,Reference,Difference> &' from 'POLE::ole_directory_iterator' c:\Boost\include\boost-1_32\boost\iterator\iterator_facade.hpp(837) : see declaration of 'boost::operator`!='' I'm modifying some one else library, but I get the last version from the author and added the modifications to the new sources, this code works with the last library sources but not with the new one. I check the sources more than once and there are no differences. I'll be glad if some one give me a hint. best regards and thanks in advance Israel

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Logo voting procedures
by Jonathan Turkanis 01 Dec '04

01 Dec '04

Hi All, I think the logo discussions are going very well. I've made several submissions, and received some positive feedback, but personally I don't care if one my submissions, or a variation, is selected. I'd just like to get a nice big collection of ideas so that we have a good selection to choose from. I think choice of a logo should be based largely on aesthetics, and is therefore a good candidate for a community-wide vote. The 'meaning' of a logo should be obvious -- or it's not a good logo. Also, I think it should be pretty clear which 'meanings' are reasonable to associate with Boost. My guess is that a simple voting system in which each person votes for just one submission will either result in a clear winner or narrow the field enough that we can avoid the potential problems being anticipated. However, in case my optimism turns out to be unwarranted, I have prepared two additional submissions. Best Regards, Jonathan begin 666 logo10.gif M1TE&.#EA,P'&`.8``````/___Z&AH5MRM%>.VBD,SS41^81N_[FL_R(.H1D+ M>CXG\P\)2D8\T4U$]3X^/^WM[MW=WL'!PD]8QFQN@$Y?YJ6LVJ"GR59JN0X0 M&4=(3"4O5G1[E%UTNF%NEH*+J5!UXC)$=%MSM5EOK5=KHE-EE8B7O&Z&NTM7 M<R(F+TU@ATE07E2#W&!]JU&*W%6,W%>-VTEVMCUBF%.-W5B2Y%>1X52,VE>/ MW52*UE>/VU>-V%:+U%6(T$1MIU2%R5!_P%)[M5%VJEN"N6Z:UHZNVL[/T'EY M=Y"/CK6TM*>GIV-C8____P`````````````````````````````````````` M```````````````````````````````````````````````````````````` M```````````````````````````````````````````````````````````` M`````````````````````````````````````````````````"'Y! $``$L` M+ `````S`<8```?_@ &"@X2%AH>(B8J+C(V.CY"1DI.4E9:7F)F:FYR=GI^@ MH:*CI*6FIZBIJJNLK:ZOL+&RL[2UMK>XN;J[IP"^O\"\PL/"P,8`J\?!Q,S- ML\J_R=#(SM76JM/4J=G7W=ZBW-C3W^3EF>';X^;K[(_HJ._M\O.#\:;V]/GF M^*3\^O_7_(%3!["@-X&A$!I<J$OA)X<,(]*"V(FBQ(NN+&[2B+$C/((?H7D< M68OC.9 D4[8RB8FERI<G18J3";-F+Y3W<-K<^5"GI&Q @PK5QE/ET*-(?1E* MRC1H49A-H]*L)[5JM*=&K5I=JK4JUJQ=HW(-V_1K2K)B"Z$M:_86A")(_XY( MZ+<VZ=BZ0]O&>HM$P!$E&AX\T("$+MZ\:@\CUHOJK02_@ 5+'MS#!XHCHQ0O MIJH9*.-1$")(2/(W\(,4@E<H,6(D\ H@-6K84($Y86?/B6_[_%R);VG!J!^H M-G+DB( D202X]E&#P(W8,HQ$`*7;)6=EO%/Q%6 D<G -JXD+.)[\N-_ *'8T MK^$#=HT@*PK#LEZ)?O9%VW^?'JQDM?'QR)4WWH!&"%9"#3<0P-X*#Y1P`PV6 M)3'?;@--=1\FOD6V'WC^_8?<@"""F)P2@@510PX*!J$!"B5HH((-[*%@! 09 M46B;A1="XEMWI@TV7''&!2A@B$22QN */R1XP_\++:K000<DK*@##;/-N)*- MU&&9HR [:B@8>*QY6-Z01)9YW!'H,:>@#BAH4$('`PP@P@@:($E##3(H400K M]DW2ITUOD>8E?QT.2*:9B!IZA& J[)!(a)#3_4.0*<<0[0P0@K:! $#33 )U\Z M.);RYT@[,B@9AZP9^F&BK)I98(,WH$A#I"B,($*EE3Z)P@,DS##K"A*"BMU, MPWY6ZF3"A2?FH:TV"Z `)#X`! 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M#/2U`A2@0(Y?0P$+9$ #006%DU%$JB+@``;0.<(+LN("0$N.M@0(\A!H,(X7 M=/AT0YAUO:+\:75@V1)YAE\(.B#4$8P@$[ [JH0]$()I=^#;X/YV"#SP@?L& MFHC_;2L,; "#$52O!44[M]ZRVUA2U6#3I7C ? &2@;6BR ,M%L %\"E@.6*D MQ>#XEK<B2GQH%2N;L=G=;<+CZ.!YS'2S(WI/CI-;:85[_% &K]KB/JXW8HA\ MXL>IL 9,7>H,G#>H6RIYKX(0(a)I6[W,^^)KG.=\YSD(L"Y?V '=![3O2B&_WH %>0D$`#L` ` end

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Front page... with new logo.
by Rene Rivera 01 Dec '04

01 Dec '04

http://redshift-software.com/~grafik/boost/index.htm Boost C++ Libraries Hopefully all the bugs are worked out at this point :-) About the logo... In keeping with the style it's simple; it's only based on text outlines. Components are: * Solid "Boost" with surrounding template "<>" in outline form. * The slight perspective shadow of that, with the "{C++}" as part of the shadow. The hope is to invoke STL, templates, libraries, and C++. The "<Boost>" part can be any color, and should be adjusted to fit the background it's over and the context. The shadow part should be kept in a dark color (it's black right now). And it should be easy enough to make a vector version.. Just need to crank up an SVG editor :-) -- -- Grafik - Don't Assume Anything -- Redshift Software, Inc. - http://redshift-software.com -- rrivera/acm.org - grafik/redshift-software.com - 102708583/icq

10 14

RE: [boost] Thread: Why is my prog aborting after 283 or so threads?
by Tim Laplaca 01 Dec '04

01 Dec '04

Thanks again Caleb. A question for the designers of Boost::thread: Would it be possible for the thread library to have functionality added so that the thread itself can call a function like 'join' that releases all its resources? This would simplify my program a lot, and I suspect other applications as well. Tim -----Original Message----- From: boost-bounces(a)lists.boost.org [mailto:boost-bounces@lists.boost.org] On Behalf Of Caleb Epstein Sent: Monday, November 29, 2004 3:43 PM To: boost(a)lists.boost.org Subject: Re: [boost] Thread: Why is my prog aborting after 283 or so threads? On Mon, 29 Nov 2004 15:24:07 -0500, Tim Laplaca <tlaplaca(a)voiceglo.com> wrote: > Can you post your code to the list? Gladly. See attached. Basically I just abandoned the thread_group and am calling thread::join after the sleep call. -- Caleb Epstein caleb dot epstein at gmail dot com

2 1

What is a secret of mpl::set?
by Alexander Nasonov 01 Dec '04

01 Dec '04

I have implemented typeof+mpl::set based "unique" algorithm for overloads library. MPL associative containers are impressive, I must say. On an overload set containing 200 functions with unique signatures at positions 1, 2, 10, 39 and 200 new version compiles in 12 seconds on my notebook while for old version it's 47 seconds. What is a secret of mpl::set? I expected it's typeof-based like "at" for vectors, but it seems it's not. If it doesn't use typeof, may be I could try to put mpl::set idea into my algorithm? -- Alexander Nasonov

2 5

filter_iterator requires copy-constructible predicate?
by troy d. straszheim 01 Dec '04

01 Dec '04

Hi boost, The filter_iterator as implemented disallows creating iterators via reference-to-base, as it requires its Predicate objects to be copy-constructible. This is a problem for a class that is passed a ref to a predicate from elsewhere. It's a very easy fix, though, I'm wondering what the rationale originally was for the restriction. If it isn't significant, I'd propose the change below, as (at least from my narrow perspective) it is a big plus to be able to do this. 56c56 < filter_iterator(Predicate& f, Iterator x, Iterator end = Iterator()) --- > filter_iterator(Predicate f, Iterator x, Iterator end = Iterator()) 82c82 < const Predicate& predicate() const { return m_predicate; } --- > Predicate predicate() const { return m_predicate; } 106c106 < Predicate& m_predicate; --- > Predicate m_predicate; 112c112 < make_filter_iterator(Predicate& f, Iterator x, Iterator end = Iterator()) --- > make_filter_iterator(Predicate f, Iterator x, Iterator end = Iterator()) Thanks for your time, -t

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