June 2007 - Boost - lists.boost.org

SVN repo structure... [was: Subversion structure in KDE]
by Rene Rivera 06 Jun '07

06 Jun '07

Ping... Any comments on this? It would be nice if people voice some comments on this subject now. Instead of later when we would have to move a bunch of directories around. -------- Original Message -------- Subject: Re: [boost] Subversion structure in KDE Date: Sun, 27 May 2007 17:54:20 -0500 From: Rene Rivera <grafikrobot(a)gmail.com> Henrik Sundberg wrote: > KDE is also a large project with separate subprojects. I thought it > might be a good idea to look at their structure. [snip] > Here is the repository: http://websvn.kde.org/ [snip] > How about a trunk with the two subdirectories Boost and Sandbox? The > Boost directory would contain libraries that are to be part of the > next official Boost release, and the Sandbox other libraries. If I'm understanding you, and the KDE docs, correctly, what you want is something like(**): [boost-svn] boost stable (full boost tree here) devel (full boost tree here) branches my_branch (full boost tree here) cmake_a (full boost tree here) cmake_b (full boost tree here) tags boost_1_33_1 (full boost tree here) boost_1_34_0 (full boost tree here) sandbox devel xml (partial boost tree here) explore (partial boost tree here) branches xml_b0 (partial boost tree here) explore_b0 (partial boost tree here) tags xml_for_review (partial boost tree here) explore_for_review (partial boost tree here) That seems like a reasonable arrangement to me. It has the beauty of being easy to explain, and it's not too far off from what we have now. The one drawback I can see is that one common case, of updating boost/stable and boost/devel can't be done in one go. But I think that's a reasonable aspect to give up (not that we had it in the first place) since hopefully working with both at the same time will be an infrequent task. (**) I'm ignoring the website tree because it's not the same kind of beast. Since it only has to deal with two versions, and doesn't need tags. -- -- Grafik - Don't Assume Anything -- Redshift Software, Inc. - http://redshift-software.com -- rrivera/acm.org - grafik/redshift-software.com -- 102708583/icq - grafikrobot/aim - grafikrobot/yahoo

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[preprocessor] nested sequences?
by Eric Niebler 05 Jun '07

05 Jun '07

I must be doing something stupid. How can I process a sequence of sequences? I expected to be able to use nested invocations of SEQ_FOR_EACH, but I'm not getting the results I expect. Here's my code: #include <boost/preprocessor.hpp> #define INNER(R, DATA, ELEM)\ **ELEM**, #define OUTER(R, DATA, ELEM)\ << BOOST_PP_SEQ_FOR_EACH_R(R, INNER, ~, ELEM) >>, BOOST_PP_SEQ_FOR_EACH(OUTER, ~, ((1)(2)) ((3)(4)) ) I expected something like: << **1**, **2**, >>, << **3**, **4**, >>, But instead I'm getting: << BOOST_PP_SEQ_FOR_EACH_M(3, (INNER, ~, (1)(2) (nil))) BOOST_PP_SEQ_FOR_EACH_M(4, (INNER, ~, (2) (nil))) >>, << BOOST_PP_SEQ_FOR_EACH_M(4, (INNER, ~, (3)(4) (nil))) BOOST_PP_SEQ_FOR_EACH_M(5, (INNER, ~, (4) (nil))) >>, I've tried both msvc-8.0 and gcc-3.4. Can anybody see my mistake? -- Eric Niebler Boost Consulting www.boost-consulting.com

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[1.34.1] Bug #990 fixed
by Hartmut Kaiser 05 Jun '07

05 Jun '07

Hi all, I just fixed #990: 'spirit's file_iterator truncates file size value on Windows x64'. This involved changing some long's to std::ptrdiff_t. All related tests pass on the platforms available to me (Win32/64, VC8SP1). Currently, the fix is applied to CVS::HEAD only. Is it ok to apply it to the 1.34 branch as well? Regards Hartmut

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[typeof] How to know whether a expression is void?
by Atry 05 Jun '07

05 Jun '07

Hi everybody, I have an template function, and I want to know if it return void, but it does not work: template<typename T> struct is_foo_void : boost::is_void<BOOST_TYPEOF(T::foo(123))>{}; struct foo_struct { template<typename T> static void foo(T){} }; BOOST_STATIC_ASSERT(is_foo_return_void<foo_struct>::value); //////////////////////////////////////////////////////////// Yes, I know funtion_traits would be help if I have a non-template function, but in this case I can't, what should I do?

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boost.devel archive at ActiveState disconnected
by Malte Clasen 05 Jun '07

05 Jun '07

Hi, the Boost website says that ActiveState has a searchable mailing list archive of boost.devel (http://www.boost.org/more/mailing_lists.htm#archive) However, this archive is apparently disconnected since 2005 due to "excessive bounces" (http://aspn.activestate.com/ASPN/Mail/Message/boost/2844681) It would be helpful to either reactivate this account or remove the link from the boost site. Best regards, Malte

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Boost inspection notification (2007-06-05/RC_1_34_0) *X*
by Rene Rivera 05 Jun '07

05 Jun '07

Boost Inspection Report Run Date: 16:08:12 UTC, Tuesday 05 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: 11453 files scanned 909 directories scanned (including root) 193 problems reported Problem counts: 0 files with invalid line endings 0 bookmarks with invalid characters 3 invalid urls 101 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 (33) 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| 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libs/filesystem/doc/tr2_proposal.html: *A* invalid URL (hardwired file): file:///C|/boost/site/libs/filesystem/doc/operations.htm#complete_note |graph| boost/graph/relax.hpp: *T* libs/graph/example/file_dependencies.cpp: *M* violation of Boost min/max guidelines on line 139 libs/graph/test/serialize.cpp: *T* |iostreams| libs/iostreams/doc/concepts/multi-character.html: *A* unlinked file libs/iostreams/doc/installation.html: *A* broken link: ../../../tools/build/v1/build_system.htm |lambda| boost/lambda/core.hpp: *U* unnamed namespace at line 62 boost/lambda/detail/lambda_functors.hpp: *U* unnamed namespace at line 25 boost/lambda/exceptions.hpp: *U* unnamed namespace at line 24 |math| libs/math/test/common_factor_test.cpp: *M* violation of Boost min/max guidelines on line 146 *M* violation of Boost min/max guidelines on line 147 *M* violation of Boost min/max guidelines on line 193 *M* violation of Boost min/max guidelines on line 194 |more| more/cvs.html: *A* unlinked file 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Boost inspection notification (2007-06-05/RC_1_34_0) *LC*
by Rene Rivera 05 Jun '07

05 Jun '07

Boost Inspection Report Run Date: 16:08:19 UTC, Tuesday 05 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: 11453 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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[iostreams] Bugs in iostreams
by Chad Walters 05 Jun '07

05 Jun '07

Hey folks, Not really sure what the right procedure is here, but I posted two bugs with patches in iostreams to the ticket system last week: http://svn.boost.org/trac/boost/ticket/1002 http://svn.boost.org/trac/boost/ticket/1003 One of them is a simple typo fix in some typedefs and the other is a clear issue where the close() code does not perform the documented behavior. I understand that the regular maintainer of iostreams is otherwise occupied. Is there anyone else who can look over the bugs and either commit them or give me feedback? Thanks for any assistance or info (eg: pointers on proper procedure, expected turnaround, etc). Chad Walters

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[interprocess] container requirements for B.IP allocators
by Joaquín Mª López Muñoz 05 Jun '07

05 Jun '07

In the section entitled "Container requirements for Boost.Interprocess allocators" from Boost.Interprocess documentation (http://tinyurl.com/2bruhb ), it is stated that containers compatible with B.IP allocators must honor the following conditions: 1. STL containers may not assume that memory allocated with an allocator can be deallocated with other allocators of the same type [...] 2. Containers' internal pointers should be of the type allocator::pointer and containers may not assume allocator::pointer is a raw pointer. 3. All objects must be constructed-destroyed via allocator::construct and allocator::destroy functions. I see two problems with requirement 3: a. Chances are that allocator member functions construct, destroy and address be deprecated in C++0x, if the N2257 paper by Matt Austern (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2257.html ) is taken into consideration. b. I've casually inspected the code of B.IP and seems like the allocator construct/destroy interface is *not* actually used, see for instance list_alloc in boost/interprocess/containers/list.hpp So, if condition 3 is not used, I wonder what the actual requirements are with respect to allocator::pointer. I guess the main assumption B.IP containers work on is that allocator::pointer is implicitly convertible to/from T*. Also, what the requirements are when handling (nonraw) pointers to types other than T? Consider the following: struct T { X x; }; If I've got an allocator::pointer pt to an object t of type T and want to store a nonraw pointer to x, how should I do? I guess something like: allocator::rebind<X>::other::pointer px=pt->x; but this is just a guess from my part, as it's not documented. Some clarifications on these issues, and maybe a rewriting of the relevant doc sections, would be welcome for those container writers willing to become B.IP allocator compatible. Thank you! Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

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[function] allocator template parameter question
by Emil Dotchevski 05 Jun '07

05 Jun '07

One important advantage of using boost::function is that it acts like a function pointer, reducing physical coupling between compilation units. This is very much like shared_ptr. A nice feature of shared_ptr is that it has a single template parameter, T, even though diferent instances of shared_ptr<T> can use different allocators. When using boost::function, one can also provide an allocator, but unlike shared_ptr, the allocator is a default parameter of the boost::function class template. Is there a reason why this is necessary? Can't boost::function use similar technique to the one employed by shared_ptr to avoid the need for this second template parameter? Emil Dotchevski

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