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

Boost Development Environment proposal
by Beman Dawes 11 Jun '07

11 Jun '07

There is a fresh draft of a Boost Development Environment proposal up at http://mysite.verizon.net/beman/development_environment.html This is a continuation of the "Proposal for radically altered approach to releases" discussion of a year ago. The topic has broadened as it has become obvious that release management is best dealt with in relation to our overall development environment, rather than something that happens in isolation. The proposal reflects a discussion at BoostCon with Troy Straszheim, Dave Abrahams, Eric Niebler, and Doug Gregor, and also insights from Thomas Witt regarding difficulties with release stability. The plan is to implement this proposal as we move to Subversion, so that things like directory permissions can be set up accordingly. Comments welcome! --Beman

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Sorting
by Michael Marcin 11 Jun '07

11 Jun '07

A while ago there was talk of a sorting library on this list. I just ran across: http://sourceforge.net/projects/burstsort/ Anyone know if this is truly a novel algorithm? This implementation is GPL'ed which makes it pretty useless to me. If it really is good perhaps someone could provide a Boost implementation. Thanks, Michael Marcin

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Re: [boost] [multi_index] use cases for iterator_to()
by Paul Rose 11 Jun '07

11 Jun '07

>> I guess I'l finally include it, but it'd be so much nicer if we could >> find a conclusive use case. I've also thought about legacy interfaces >> requiring raw pointers, if only we could come up with a simple >> specific scenario on that line. Here's a case that is kind of an inverse of the legacy case: I sometimes develop DLL's in windows that are used by a team of C delveopers. I feel free to use C++ (including boost.multindex) in the implementation of the DLL, but the interface is straight C. Part of that interface may give out an opaque pointer to an object owned by a boost.multiindex. /* C interface */ typedef struct FooTag Foo; Foo *makeFoo(int x, int y, int z); void killFoo(Foo *); void flushFoo(Foo *); void flushAllFoos(); Latter they call in with that opaque poitner as a parameter. I could look up the node in the container, but iterator_to would be better. I don't consider this "legacy" because I'm writing a new library to support new development, but I am contrained by the interface language ("C" vs "C++"). Paul

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Re: [boost] [multi_index] use cases for iterator_to()
by Paul Rose 11 Jun '07

11 Jun '07

>> In which sense is the use of pointers rather than iterators >> "more convenient"? In the "lazy programmer" sense. (I did say "admittedly for a fairly weak reason" :-) Usually it is a case of my passing around a pointer that can optionally be NULL, and then discovering during maintenance that I need to have an iterator. In all such cases I've been able refactor the routines to take an iterator, and ultimately been happy with that as the superior solution. However, the "lazy programmer" in me may have chosen iterator_to had it been available. Hmm. Sounds like I just described a good reason *not* to add it. Paul

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Boost inspection notification (2007-06-11/RC_1_34_0) *X*
by Rene Rivera 11 Jun '07

11 Jun '07

Boost Inspection Report Run Date: 16:06:15 UTC, Monday 11 June 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) 163 problems reported Problem counts: 0 files with invalid line endings 0 bookmarks with invalid characters 3 invalid urls 71 broken links 21 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) boost-root (1) build (1) date_time (1) doc (2) 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) 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 (2007-06-11/RC_1_34_0) *LC*
by Rene Rivera 11 Jun '07

11 Jun '07

Boost Inspection Report Run Date: 16:06:22 UTC, Monday 11 June 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* tools/build/v2/doc/src/ advanced.xml: *C* *L* architecture.xml: *C* *L* catalog.xml: *C* *L* extending.xml: *C* *L* faq.xml: *C* *L* fragments.xml: *C* *L* howto.xml: *C* *L* install.xml: *C* *L* recipes.xml: *C* *L* reference.xml: *C* *L* standalone.xml: *C* *L* tutorial.xml: *C* *L* userman.xml: *C* *L* tools/build/v2/example/generate/ REAME.txt: *C* *L* a.cpp: *C* *L* tools/build/v2/example/generator/ README.txt: *C* *L* soap.jam: *C* *L* tools/build/v2/example/python_modules/ python_helpers.jam: *C* *L* python_helpers.py: *C* *L* tools/build/v2/test/ abs_workdir.py: *C* *L* dependency_property.py: *L* dependency_test.py: *C* *L* direct_request_test.py: *C* *L* dll_path.py: *L* double_loading.py: *L* duplicate.py: *L* echo_args.jam: *C* *L* empty.jam: *C* *L* expansion.py: *L* explicit.py: *L* gcc_runtime.py: *L* tools/build/v2/test/project-test3/lib3/ Jamfile: *C* *L* tools/build/v2/test/ readme.txt: *C* *L* svn_tree.py: *L* tag.py: *L* test_system.html: *L* tools/build/v2/tools/ 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1 0

boost-docs list down?
by Matias Capeletto 11 Jun '07

11 Jun '07

I am not receiving posts from the boost-docs list from two days ago, it seems to be down. Can anybody take a look? Thanks Matias

3 3

[system] patch for error_code.cpp
by Boris Gubenko 11 Jun '07

11 Jun '07

Module libs/system/src/error_code.cpp has conditionalization which ensures that strerror_r() is called only on the platforms where this function is availble. The condition does not take into account Tru64 and VMS and, as a result, the module does not compile on these platforms. Attached patch fixes this problem. Ok to commit to HEAD? Thanks, Boris

1 1

bug found in boost::intrusive::detail::ihashtable<...>::rehash
by Yoni Lavi 11 Jun '07

11 Jun '07

I hope I'm posting it to the correct newsgroup. I wanted to mail this directly to the developer of boost::intrusive (Ion Gazta?aga), but I can't find his e-mail anywhere, or any way to directly report the bug. I am not a boost developer myself. Position of a contained element modulo m (new_buckets_len) is known to remain equal to its previous position modulo n (old_buckets_len) ONLY IF m < n AND n %m == 0, but the latter condition isn't being checked. The code assumes it can skip rehashing of m first buckets if m < n: //If we are shrinking the bucket array, just rehash the last nodes if(same_buffer && (old_buckets_len > new_buckets_len)){ n = new_buckets_len; } //Iterate through nodes for(; n < old_buckets_len; ++n){ ... } Also, the following comment: //If this is a buffer expansion don't move if it's not necessary if(same_buffer && new_n == n){ ++before_i; ... Needs to be changed simply to "don't move if it's not necessary" - it needs to be checked/may happen when shrinking the hash table also. Here's a suggested bugfix: - check if (old_bucket_len > new_buckets_len && 0 == old_bucket_len % new_buckets_len). - if true, i'th bucket needs to store the contents of all previous buckets at positions i + j*new_buckets_len for j in [0, old_buckets_len / new_buckets_len) spliced one after another. There is no need to check on a per-element basis. I believe this optimization should be done even when the rehash isn't in-place. A special case where this optimization is useful is when using power-of-2 num_buckets. - if false, buckets have to be re-scanned, using the existing code in the body of the existing loop, but starting from n = 0 always: for(; n < old_buckets_len; ++n){ ... } Please correct me if I'm wrong on this.. but just to be sure, I made a test program that verified rehash() can break the container's invariants when shrinking the container in place, which was indeed found to be the case. As a totally unrelated note, I don't understand why iunordered_set doesn't support a default constructor (so that buckets = 0 and num_buckets = 0, given the existence of a rehash() function. I see it like the reset() function in a scoped_ptr. If a "reset" style function is supported, the class shouldn't force you to initialize it at construction time. Then again, it's a matter of taste in design more than anything...

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[fusion] transitive const / mutable views?
by Martin Weiser 11 Jun '07

11 Jun '07

Dear all, while I appreciate boost::fusion very much, I've recently stumbled across a point that I don't understand. It appears to me that - const is transitive, i.e. dereferencing an iterator into a const vector yields a reference to a const element and - transformation algorithms work on const sequences. Combined, these two imply that an in-place modification of a sequence through a view generated by a transformation algorithm is impossible. While this is perfectly reasonable for transform, it seems quite restrictive for filter or erase. After all, filter_view accepts a non-const input sequence. My point is probably best illustrated by the following code snippet: #include <iostream> #include <boost/type_traits/is_same.hpp> #include <boost/fusion/algorithm/iteration/for_each.hpp> #include <boost/fusion/algorithm/transformation/filter.hpp> #include <boost/fusion/sequence/container/vector.hpp> #include <boost/fusion/sequence/io/out.hpp> #include <boost/fusion/sequence/view/filter_view.hpp> struct SetToZero { template <typename X> void operator()(X& x) const { x = 0; } }; int main(void) { using namespace boost; using namespace boost::fusion; typedef vector<int,char,double,int> Vec; Vec vec(3,'.',1.0,4); std::cout << vec << '\n'; // This does not compile (error: assignment of read-only reference »x«) for_each(filter<int>(vec),SetToZero()); // This works... for_each(filter_view<Vec,is_same<mpl::_,int> >(vec), SetToZero()); std::cout << vec << '\n'; return 0; } So I'm wondering if this is intended? If yes, how do I best modify (part of) sequences defined by transformation algorithms? Thanks, Martin -- Dr. Martin Weiser web: www.zib.de/weiser Zuse Institute Berlin mail: weiser(a)zib.de Numerical Analysis and Modelling pgp key: www.zib.de/weiser/weiser.asc

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