July 2007 - Boost - lists.preview.boost.org

[fusion] Illegal partial specialization error.
by Michael Marcin 06 Jul '07

06 Jul '07

If I include <boost/fusion/support/tag_of.hpp> my compiler (derived from Metrowerks 9.4) gives me several errors claiming illegal partial specializations. It looks like it's partially specializing forward declarations of the tag_of structure. I don't know if that's allowed (from the error I assume probably not) but it certainly seems to be pointless to me. Are these perhaps supposed to be more than declarations? Thanks, Michael Marcin

7 17

Interest in a static-sized version of cvalarray
by Michael Tegtmeyer 06 Jul '07

06 Jul '07

Some time ago I posted a message to this list about interest in a static-sized version of cvalarray. I'll include the original message for reference. I received some emails stating that there was interest. The implementation has been in the sandbox for some time now. I'd like to guage interest again to determine if it is worth working to add to boost. The implementation has not been boostified because it is in active use here where I work (autotool land) so if there is interest, some additional work needs to be done to absorb the boost framework. The implementation is complete without any known bugs. There is only one header but you can go though the normal ./configure, make, make install to put it somewhere. Tests can be run using 'make check' and documentation is in the doc directory. Of additional interest since my previous post: the implementation will now automaticallty unroll all numeric ops at compile time (subject to the compiler) up to a predefined array size. My original post: Hello, I am trying to guage interest in a fixed sized version of valarray. I frequently found myself using small(-ish) compile-time known sized numeric arrays that don't justify the overhead of operator new in std::valarray but needed the math interface that valarray provided. I wrote a static-sized version of valarray for this purpose. It is modeled after std::valarray and implements about 90% of valarray's interface (obviously resizing is not included, neither is gslice due to the result not being known at compile time). Examples of it's use are: float _v[10] = {...}; size_t _i[5] = {...}; cvalarray<float,10> v1(_v); cvalarray<float,5> v2 = v1[cslice<0,5,2>()]; v1[cslice<0,3,3>()] = 0.0f; cvalarray<size_t,5> ind(_i); cvalarray<float,5> cvalB = v1[ind]; v2 *= (v2 + v1) / 2.0; //all of the usual math ops I have a complete implementation that models std::valarray in every possible way (with compile-time known limitations) including expression-template support for the numeric ops. My testing indicates a decent performance increase over gcc4's valarray for small number of elements <1000. If anyone has any interest, I'll put together some docs and throw it in the sandbox. Mike Tegtmeyer

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Re: [boost] [IBD] Help request, A Woman's Point of View
by james.jones＠firstinvestors.com 06 Jul '07

06 Jul '07

From: "Jake Voytko" <jakevoytko(a)gmail.com> > OK, I think it's time we try to remain professional and back off a little. > Matias clearly didn't mean any harm by what he said, and he had good intent. > Joaqu?n raises valid points in his email, and I think these need to be > addressed, and negative discussions aren't going to advance the topic any. I absolutely agree that no harm was intended. However, I don't think it's the job of Boost to try to right some perceived wrong in the general programming community - beyond the wrong of not having great open-source C++ libraries, of course! It's clearly the case that there are way more men than women programmers. Whether this is a major problem or not is debatable, and I don't think it's a debate that belongs on the boost-devel list. But even if it *is* a problem, it's not one we need or should try to solve. We already have a whole set of problems - ones involving C++ programming - that we need to solve and that this community was set up to solve. The problem with "affirmative action" in open source projects is exactly the same as in regular hiring, i.e. the token minority brought in will be suspected of being not as good technically as the rest of the group. This is not because that minority can't be just as good or better, but because affirmative action itself is based around the idea of giving extra - undeserved - bonuses to these minorities. The paradoxical result may be that really deserving minority candidates may stay away if they have enough dignity. "I don't want your lousy handouts," they'll think. Anyway, just as I don't think boost-devel is the place to debate whether an unbalanced sex ratio is a problem in programming, I also don't think it's the place to debate the pros and cons of affirmative action. So I will drop this now that I've had my say. Please let's not let Boost get distracted by this issue. - James Jones Administrative Data Mgmt. Webmaster 375 Raritan Center Pkwy, Suite A Data Architect Edison, NJ 08837

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Boost is a finalist in the SourceForge.net Community Choice Awards
by David Abrahams 06 Jul '07

06 Jul '07

According to http://sourceforge.net/awards/cca we're nominated in this category: Best Technical Design: The project most likely to inspire awe with its technical perfection If you think Boost deserves this award, go to http://sourceforge.net/awards/cca and vote for us. I'm not sure what we'd win, but it's always nice to be recognized. Cheers! -- Dave Abrahams Boost Consulting http://www.boost-consulting.com The Astoria Seminar ==> http://www.astoriaseminar.com

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Re: [boost] [IBD] Help request, A Woman's Point of View
by james.jones＠firstinvestors.com 06 Jul '07

06 Jul '07

From: "Stjepan Rajko" <stipe(a)asu.edu> > Anyway, I'd really like to applaud Matias for actively trying to > address the gender imbalance, since if it wasn't for the female > dancers that were encouraging of my participation in dance, I wouldn't > be a dancer now (and I suspect not nearly as happy a person). I think > that until you start to fix the gender imbalance, you don't even > realize what kind of useful feedback, opinions, and participation you > might be missing out on. You may find that women find it creepy for 50 guys to be, in effect, calling out, "Hey, join us! Come on, we're nice people! And we'll listen to you - here, you can sit next to me!" Don't force it. - James Jones Administrative Data Mgmt. Webmaster 375 Raritan Center Pkwy, Suite A Data Architect Edison, NJ 08837

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Fw: [Boost C++ Libraries] #911: [bind] inline placeholder macro
by Peter Dimov 06 Jul '07

06 Jul '07

Boost C++ Libraries wrote: > #911: [bind] inline placeholder macro > -----------------------------------------+---------------------------------- > Reporter: daniel_walker(a)users.sf.net | Owner: nobody > Type: Patches | Status: assigned > Milestone: | Component: None I'd like to set the Component of this ticket to 'bind', but Trac doesn't let me. How does one go about adding a new Component?

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[UUID] news ?
by Marco 06 Jul '07

06 Jul '07

I was wondering if the final decision about the acceptance of the UUID library has been taken ? Is there a reviewed library at present ? Regards, Marco -- Using Opera's revolutionary e-mail client: http://www.opera.com/mail/

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Boost inspection notification (2007-07-06/RC_1_34_0) *X*
by Rene Rivera 06 Jul '07

06 Jul '07

Boost Inspection Report Run Date: 16:06:11 UTC, Friday 06 July 2007 An inspection program <http://www.boost.org/tools/inspect/index.html> checks each file in the current Boost CVS for various problems, generating this as output. Problems detected include tabs in files, missing copyrights, broken URL's, and similar misdemeanors. Totals: 11452 files scanned 909 directories scanned (including root) 165 problems reported Problem counts: 0 files with invalid line endings 0 bookmarks with invalid characters 3 invalid urls 70 broken links 24 unlinked files 22 file/directory names issues 2 files with tabs 9 violations of the Boost min/max guidelines 35 usages of unnamed namespaces in headers (including .ipp files) Summary: archive (3) bind (1) build (1) date_time (1) doc (3) filesystem (3) graph (3) iostreams (2) lambda (3) math (8) more (4) mpl (4) multi_array (2) ptr_container (1) python (8) regex (1) regression (32) serialization (1) smart_ptr (2) test (81) type_traits (1) Details: *R* invalid (cr only) line-ending *A* invalid bookmarks, invalid urls, broken links, unlinked files *N* file/directory names issues *T* tabs in file *M* uses of min or max that have not been protected from the min/max macros, or unallowed #undef-s *U* unnamed namespace in header |archive| boost/archive/basic_streambuf_locale_saver.hpp: 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Boost inspection notification (2007-07-06/RC_1_34_0) *LC*
by Rene Rivera 06 Jul '07

06 Jul '07

Boost Inspection Report Run Date: 16:06:19 UTC, Friday 06 July 2007 An inspection program <http://www.boost.org/tools/inspect/index.html> checks each file in the current Boost CVS for various problems, generating this as output. Problems detected include tabs in files, missing copyrights, broken URL's, and similar misdemeanors. Totals: 11452 files scanned 909 directories scanned (including root) 1059 problems reported Problem counts: 661 files missing Boost license info or having wrong reference text 398 files missing copyright notice Summary: any (1) archive (1) build (68) concept_check (22) conversion (5) doc (1) filesystem (2) function (1) graph (1) inspect (1) integer (9) lambda (10) libs (6) logic (2) math (1) more (13) mpl (417) multi_array (13) numeric (188) optional (1) people (4) program_options (35) property_map (15) ptr_container (8) python (14) rational (5) regex (4) regression (118) release (2) serialization (16) signals (2) smart_ptr (8) test (3) timer (1) tr1 (2) tuple (5) utility (12) variant (42) Details: *L* missing Boost license info, or wrong reference text *C* missing copyright notice |any| libs/any/doc/ any.xml: *L* |archive| boost/archive/detail/ utf8_codecvt_facet.hpp: *L* |build| tools/build/v2/build/ build-request.jam: *L* modifiers.jam: *L* tools/build/v2/doc/ Jamfile.v2: *C* *L* 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[foreach] copying rvalues
by Lewis Hyatt 06 Jul '07

06 Jul '07

I'm not quite sure I understand the behavior of this simple test of BOOST_FOREACH: ------------- #include <vector> #include <iostream> #include <boost/foreach.hpp> using namespace std; struct noisy_vector : public vector<int> { explicit noisy_vector(size_t const sz=0, int const val=0) : vector<int>(sz, val) { cerr << "\tcontainer was constructed" << endl; } noisy_vector(noisy_vector const& other) : vector<int>(other) { cerr << "\tcontainer was copied" << endl; } noisy_vector& operator=(noisy_vector const& other) { vector<int>::operator=(other); cerr << "\tcontainer was assigned" << endl; } ~noisy_vector() { cerr << "\tcontainer was destructed" << endl; } }; inline noisy_vector get_vec(size_t const sz, int const val=0) { return noisy_vector(sz,val); } int main() { cerr << "TEST 1: LVALUE" << endl; { noisy_vector vec = get_vec(5); cerr << "\tstarting foreach" << endl; BOOST_FOREACH(int const& i, vec); } cerr << endl; cerr << "TEST2: LVALUE, REFERENCE" << endl; { noisy_vector const& vec = get_vec(5); cerr << "\tstarting foreach" << endl; BOOST_FOREACH(int const& i, vec); } cerr << "TEST 2: RVALUE" << endl; { cerr << "\tstarting foreach" << endl; BOOST_FOREACH(int const& i, get_vec(5)); } } ------------- If I compile this, using g++ 3.4.4, with the RVO disabled (using -fno-elide-constructors), then I get the following output: ------------- TEST 1: LVALUE container was constructed container was copied container was destructed container was copied container was destructed starting foreach container was destructed TEST2: LVALUE, REFERENCE container was constructed container was copied container was destructed starting foreach container was destructed TEST 2: RVALUE starting foreach container was constructed container was copied container was destructed container was copied container was copied container was destructed container was destructed container was destructed ------------- If I compile it with the RVO enabled, I get the following output: ------------- TEST 1: LVALUE container was constructed starting foreach container was destructed TEST2: LVALUE, REFERENCE container was constructed starting foreach container was destructed TEST 2: RVALUE starting foreach container was constructed container was copied container was destructed container was destructed ------------- So in either case, using BOOST_FOREACH requires one extra copy. Why is this necessary? I guess the macro is making a copy of the argument to avoid evaluating it more than once, but isn't it possible just to bind the temporary to a const reference instead? Thanks... -Lewis

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