March 2007 - Boost - lists.boost.org

smart ptr use
by Fred＠ss 15 Mar '07

15 Mar '07

Hello, I am currently integrating boost smart ptr to an existing project and I have a few questions about it uses. I will try to be as clear as possible. I have a parent - child structure (where each child has only one parent, but a parent can have zero or many children) represented as a tree structure where each parent has a vector of children. Their is no distinction between parent and child, they are both of the same class, let's call it Node. Other parts of the application can hold references to nodes but the main reference is always held by the parent. The node children are shared ptr and I need to be able to delete them no matter how many people hold references to them. But, obviously, I want the references to be cleared too and become NULL ptr. Now the only way I found to get this working is pretty tedious, I am not sure I am doing it right. What I do now is that everyone who holds a reference to a node holds it via a weak_ptr and each time they need to access the data I convert from weak to shared. Is this really to way to do this? Also, the only way to delete a node seems to be calling shared_ptr::reset() from inside the parent node. This is annoying because even if I know which child to delete I have to browse the tree to find it and call reset on the pointer. Is this right or is their a way to delete a shared object explicitlly, clearing all reference to it? Is this helps, my app is a graphic editor and if the user selects an object and hits delete I would like to be able to delete it without having to explicitely clear every references to it. Thank you! -- View this message in context: http://www.nabble.com/smart-ptr-use-tf3410093.html#a9500575 Sent from the Boost - Dev mailing list archive at Nabble.com.

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Posting signatures, again.
by Rene Rivera 15 Mar '07

15 Mar '07

Not dredge up the subject of signature content up. But I do have a request, for comments and a suggestion. Even though I do have feelings about the content of signatures, I understand that most don't, so I don't care if people put whatever content they want in them. But I do care about *formatting* of the signatures. There's been a recent rash of signatures that are not clearly marked as such. Hence to me it makes for harder reading of postings as I end up confusing the body text with the sig text. May I suggest that people follow accepted netiquette rules in this regard. Signature block <http://en.wikipedia.org/wiki/Signature_block> Netiquette <http://en.wikipedia.org/wiki/Netiquette> -- -- 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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[Boost][Python] Fails for gcc-cygwin-3.4.4
by Darren Garvey 15 Mar '07

15 Mar '07

Hello, (Please ignore this if these fails have been sorted out already.) All the fails for gcc 3.4.4 on cygwin seem to be down to __int64 not being defined properly. According to google, cygwin on Windows doesn't define __int64 (at least for gcc). Adding "-D__int64=long long" to the command line sounds (<cxxflags>?) like it should fix it, although I've no idea if making users do that themselves is frowned upon? Some links: http://tinyurl.com/2k5922 http://tinyurl.com/2txysc Regards, Darren

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[future] exception_ptr bug
by Frank Mori Hess 15 Mar '07

15 Mar '07

I think the _exp_throwable class in Peter's prototype implementation of exception_ptr needs its destructor to be declared virtual. -- Frank

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Re: [boost] SQL library with full embedded SQL-syntax
by Phil Endecott 15 Mar '07

15 Mar '07

> Choosing C++ for a projects where databases are involved is probably > rare Well it's what I spend quite a lot of my time doing, and I find it a good combination. But then I often seem to be doing things differently from everyone else... In my case I have written a C++ binding for PostgreSQL's libpq which allows me to define queries as functors: Query<string,int> insert_thing(db, "insert into things(name,qty) values ($1,$2)"); SingletonQuery<int, string> count_things(db, "select sum(qty) from things where name=$1"); insert_thing("table",1); insert_thing("chair",4); int n_pens = count_things("pen"); Note the template type parameters in the query declarations. These give the C++ types corresponding to the $n parameter placeholders in the SQL, and are mapped to the "oids" (in postgresql-speak) of the corresponding SQL types. The queries are prepared, and when they are run the parameters are passed to the database server in binary format. You get compile-time checking that the types in the query invocations match those in the declarations and run-time checking that the backend is happy with those types. I like this approach as it gives about as much type safety as is possible and lets you do database accesses with essentially the same syntax that you would use to access C++ data. I prefer this to the way that SOCI is used, where you always know that you're using SQL (though SOCI no doubt has other features that my library is missing). There is more detail here: http://svn.chezphil.org/libpbe/trunk/doc/Database I would be happy to describe my experiences further if anyone is considering adding something along these lines to Boost. My code is currently GPL but I am flexible about that. Regards, Phil.

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STL containers and boost interprocess allocators
by Vishnu M Menon 15 Mar '07

15 Mar '07

Hi, I had sent this mail earlier, but that seems to have... disappeared. Am sending it again - hopefully there won't be duplicates. My Question: Is it possible to use boost interprocess' shared memory allocator with the normal STL containers that come with standard C++ build environments (gcc on Linux and Solaris, Visual C++ on Windows, etc.)? I know that there might be an issue with some STL containers not properly supporting encapsulated pointers in allocators that handle offset differences in memory addresses. Is this the reason why interprocess has its own containers? I apologize if this is a fairly basic question. But I think I may have hit a search blind-spot, and need some help getting out. Thanks in advance! Regards, Vishnu. ____________________________________________________________________________________ Need Mail bonding? Go to the Yahoo! Mail Q&A for great tips from Yahoo! Answers users. http://answers.yahoo.com/dir/?link=list&sid=396546091

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Boost inspection notification (2007-03-15/RC_1_34_0) *X*
by Rene Rivera 15 Mar '07

15 Mar '07

Boost Inspection Report Run Date: 16:06:55 UTC, Thursday 15 March 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: 11447 files scanned 908 directories scanned (including root) 196 problems reported Problem counts: 1 files with invalid line endings 0 bookmarks with invalid characters 3 invalid urls 104 broken links 21 unlinked files 22 file/directory names issues 1 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 (3) build (2) date_time (1) doc (2) filesystem (37) graph (2) iostreams (3) lambda (3) math (8) more (1) mpl (1) multi_array (2) ptr_container (1) python (10) 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/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/separate_compilation.html: *A* broken link: ../libs/config/test/link/test/Jamfile.v2 |mpl| boost/mpl/alias.hpp: *U* unnamed namespace at line 17 |multi_array| boost/multi_array/base.hpp: *U* unnamed namespace at line 69 libs/multi_array/test/generative_tests.hpp: *U* unnamed namespace at line 57 |ptr_container| libs/ptr_container/doc/tutorial_example.html: *A* unlinked file |python| libs/python/doc/building.html: *A* broken link: ../../../tools/build/v1/build_system.htm *A* broken link: ../../../tools/build/v1/build_system.htm#user_globals *A* broken link: ../../../tools/build/v1/build_system.htm#variants libs/python/doc/tutorial/doc/html/python/hello.html: *A* broken link: ../../../../../example/tutorial/Jamrules 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Boost inspection notification (2007-03-15/RC_1_34_0) *LC*
by Rene Rivera 15 Mar '07

15 Mar '07

Boost Inspection Report Run Date: 16:07:02 UTC, Thursday 15 March 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: 11447 files scanned 908 directories scanned (including root) 1053 problems reported Problem counts: 654 files missing Boost license info or having wrong reference text 399 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 (419) multi_array (13) numeric (188) optional (1) people (4) program_options (35) property_map (15) ptr_container (8) python (6) 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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[Report] 35 regressions on RC_1_34_0 (2007-03-15)
by Douglas Gregor 15 Mar '07

15 Mar '07

Boost Regression test failures Report time: 2007-03-15T02:01:29Z This report lists all regression test failures on release platforms. Detailed report: http://engineering.meta-comm.com/boost-regression/CVS-RC_1_34_0/developer/i… 35 failures in 7 libraries graph (4) iostreams (7) numeric/interval (1) optional (6) parameter (1) python (15) test (1) |graph| dijkstra_heap_performance: msvc-7.0 graphviz_test: msvc-7.1_stlport4 layout_test: msvc-7.0 relaxed_heap_test: msvc-7.0 |iostreams| bzip2_test: msvc-7.1 msvc-8.0 file_descriptor_test: gcc-cygwin-3.4.4 gzip_test: msvc-7.1 msvc-8.0 zlib_test: msvc-7.1 msvc-8.0 |numeric/interval| test_float: msvc-7.1_stlport4 |optional| optional_test: msvc-6.5 msvc-6.5 msvc-6.5_stlport4 msvc-7.0 optional_test_ref_fail2: msvc-7.1 msvc-8.0 |parameter| python_test: gcc-cygwin-3.4.4 |python| import_: cw-9.4 gcc-mingw-3.4.2 gcc-mingw-3.4.5 intel-vc71-win-9.1 msvc-6.5 msvc-6.5 msvc-6.5_stlport4 msvc-7.0 msvc-7.1 msvc-7.1 msvc-7.1 msvc-7.1_stlport4 msvc-8.0 msvc-8.0 msvc-8.0 |test| prg_exec_fail3: cw-9.4

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Any interest in dimensional analysis for orientational dimensions and Euclidean vectors?
by Tom Brinkman 15 Mar '07

15 Mar '07

Just in case any one is curious, a euclidean vector is represented by its Cartesian coordinates: (*p*0, *p*1,..., *p*d - 1) (in a d-dimensional vectorial space). It can be defined by the difference between two points (Locations), A and B: if A has coordinates (*a*0, *a*1,..., *a*d - 1) and B (*b*0, *b*1,..., *b*d - 1), then vector [image: $ \bf AB$] = *B* - *A* has coordinates (*b*0 - *a*0, *b*1 - *a*1,..., *b*d - 1 - *a*d - 1). The requirements of Euclidean Vector are very similar to those of Location, and could actually have been represented by a Location. However, an euclidean vector is very different from a point, or location, (from a mathematical point of view) and it would have been confusing to represent these two entities by the same *concept*. Yes, I'd be interested. Looking forward to reviewing your library. I'm not shur that I have any comments right now other than to say that it would be a great addition.

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