- Boost - lists.boost.org

Re: [boost] [serialization] performance comparison
by brass goowy 06 Mar '07

06 Mar '07

Rene Rivera writes: >brass goowy wrote: >> I agree it is a tenuous system. On the other hand how much of a leap >> is it from using a network file system when building? > > >Ask a company layer, project manager, sysadmin that question to get an >idea of the magnitude of the leap. > >> No one has answered my question of how to obtain 1.34. > >Perhaps because it was easy enough to find the info with a bit of >reading/searching <http://boost.org/more/release_procedures.htm>. > Thanks. I looked for the answer for about thirty minutes. After not coming up with the info that way I asked. > >But at this point I'm confused about goals... If you are not discussing >an existing Boost library, The post did discuss a Boost library. Slater said he was interested in finding ways to improve the performance of B.Ser. I wrote my ideas about that. Beyond that I was replying to some of the points he had made in his previous post. >nor discussing a possible Boost library >submission. What are you trying to achieve by asking questions in this >group? With the question about 1.34, I wanted to get some information. With the question about online code generation I want to understand what he is getting at and if there is a technical problem with the online approach that we haven't considered. Regards, Brian Wood Ebenezer Enterprises www.webEbenezer.net _______________________________________

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Any interest in dimensional analysis for orientational dimensions and Euclidean vectors?
by Andreas Harnack 05 Mar '07

05 Mar '07

Further to the ongoing discussion of (physical) dimensional analysis and the physical dimension/unit library I'd like to propose a library providing two services: 1.Orientational analysis, i.e. compile time analysis for dimensions indicating a direction in space, also called mathematical dimensions (in contrast to physical dimensions). 2.Aggregation of values carrying orientational dimensions into a data structure suitable to represent the concept of vectors in the geometrical and algebraical sense. A major application of such a vector class will be Euclidean geometry, so for lack of a better name and to distinguish it from other concepts using the name vector I'd like to talk about Euclidean vectors. The library is not intended to be a linear algebra library. No algorithms are provided that go beyond scalar and cross product. A matrix class is included too, but restricted to diagonal matrices, since matrix inversion is involved and matrix inversion is trivial only for diagonal matrices. I'm going to uploaded a proposal into the boost vault under the name 'euclid'. It comes with test programs, examples and a documentation, discussing some issues of dimensional analyses in general, the current implementation of Euclidean vectors and possible ways of extending orientational analysis to a linear algebra library. The code presented here is real life code taken from a former application project. It has not been designed with a standalone library in mind. As such it's likely to have some deficiencies. However, it seems to be a useful concept, yet reasonably simple, and worth of sharing. If there's interest in the community , I'd take the effort to boost it up to the required standards. The library began as a template providing orientational analysis in an application project involving graphical programming in both, character cell graphic as well as pixel graphic. A major source of errors was the risk to mix up of x and y coordinates, especially since several libraries where involved with different interface conventions. Using orientational analysis reduced the error rate significantly. After having a system of type distinct coordinates and coordinate expressions that could be check at compile time, it soon became apparent that it would be helpful to aggregate coordinates into vectors. However, accepting coordinates as being type distinct has some fundamental implications on the design of a vector class: the vector can no longer be a container, since container aggregate equally typed objects. Neither access operators nor iterators can be defined in the traditional way, since type would change depending on the object returned or referenced. Consequently, vectors are better represented by structures rather than arrays. To allow for an arbitrary number of dimensions a recursive template structure has been defined. Component access is provided by explicit type conversion into the component type: namespace euclid { // dimension class template template<typename T, unsigned int D> class dim { T v; public: // operations allowed for dim ... }; // vector class template template<typename T, unsigned int D> class vec { dim<T, D-1> d; vec<T, D-1> v; public: // element access template <unsigned int I> operator dim<T,I>() const { return dim<T, I>(v); } operator dim<T,D-1>() const { return d; } // vector operations ... }; // vector class base case specialization template<typename T> class vec<T,1> { dim<T,0> d; public: // element access operator dim<T,0>() const { return d; } // vector operations ... }; }; The operations defined for vectors and dimensions are those typically defined for vector spaces including some (hopefully) reasonable access and conversion operations. Applications will typically start by specializing the templates to their specific needs, like: namespace myApplication { typedef int scalar; typedef euclid::dim<scalar,0> dimX; typedef euclid::dim<scalar,1> dimY; typedef euclid::vec<scalar,2> vect; // ... } or may be templated: template <class T> class myClass { public: typedef euclid::dim<T,0> dimX; typedef euclid::dim<T,1> dimY; typedef euclid::vec<T,2> vect; // ... } Now these types can be used almost like build-in types with the benefits of additional type checking void foo(vect v); void bar(dimX x); void bar(dimX x, dimY y); int main() { dimX x, x0, x1; dimY y; vect v; x = x0+x1; // OK y = x; // Error bar(x) // OK bar(2*x0+x1) // OK bar(x+y) // Error bar(x,y) // OK bar(x,x) // Error bar(y,y) // Error bar(y,x) // Error bar(v,v) // OK, calls bar(dimX(v), dimY(v)); foo(2*v) // OK // etc. } The library addresses a problem that occurs (at least) in any application or library involving graphical programming. It is, however, surprisingly simple in both, implementation and usage. To my knowledge, no graphical library has addressed orientational analysis yet, while vectors are typically implemented by some library specific data structures, requiring unnecessary conversions when passing data from on library to another. Euclidean vectors could offer a way to solve this interface problem. As mentioned above, there's still a way to go to get the code ready for formal review, in particular naming, layout, format and licensing issues. If there's interest in the community I'd be happy to do this, so please let my know. I will, however, need assistance in proving (and improving) portability. The library compiles with GNU g++ 3.0.4, 3.3.5 and 3.4.4, but I will be unable to test it on any other platform in the near future. Looking forward to any comments, Andreas

1 0

[result_of] ambiguous instantiation for function pointers
by shunsuke 05 Mar '07

05 Mar '07

Hi, CVS HEAD can't compile this under maybe any conforming compiler. (RC_1_34 is ok.) #include <boost/utility/result_of.hpp> int my_fun(int) { return 0; } template< class F > void test(F ) { typedef typename boost::result_of<F()>::type result_t; // shall be 'void'. } int main() { ::test(&my_fun); } Specializations are not enough? Regards, -- Shunsuke Sogame

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generating unique ordinal value at compile time
by Matthias Schabel 05 Mar '07

05 Mar '07

For various reasons, it would be really nice to be able to generate a series of unique ordinal values (say integers, but really anything that is easily less_than_comparable) at compile time. A concrete example : struct system1 : ordinal<0> { }; struct system2 : ordinal<1> { }; etc... Now, if these tags can be defined in user code in various places, it can be difficult to ensure that there is no duplication of the ordinal values. What I want is something like this: struct system1 : ordinal<get_next_system_ordinal()> { }; struct system2 : ordinal<get_next_system_ordinal()> { }; where I don't really care what the specific order is, just that the ordinal values are unique... Anyone have a bright idea on how to accomplish this? Preprocessor? Matthias

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Interest in a "non derivable" utility
by Manuel Fiorelli 05 Mar '07

05 Mar '07

Is there any interest in a small utility which let developers to define pseudo-final classes, meaning that it is not possible to instantiate objects belonging to derived classes. Unfortunately, I could test my tool only on a Linux platform with the compiler gcc 4.1.1 and I am not sure the technique I used is portable to other compilers. Usage --------------------------------------------------------------------// Suppose you want to define a final class Foo, then you have to write class Foo : BOOST_NON_DERIVABLE { // .... }; Now, you try to subclass it class Goo : public Foo { // ... }; When you use inheritance it is quite obvious, you want to instantiate objects of the classes involved in the hierarchy; thus, somewhere you will probably write Goo goo; // a variant or a member of type Goo But the compiler will produce an error like that utility/nonderivable.hpp: In constructor 'Goo::Goo()': utility/nonderivable.hpp:23: error: 'boost::nonderivable_helper::nonderivable_helper()' is protected main.cpp:14: error: within this context utility/nonderivable.hpp:30: error: 'boost::nonderivable_helper::~nonderivable_helper()' is protected main.cpp:14: error: within this context main.cpp:14: error: no matching function for call to 'Foo::Foo()' main.cpp:9: note: candidates are: Foo::Foo(int) main.cpp:8: note: Foo::Foo(const Foo&) main.cpp: In function 'int main()': main.cpp:26: note: synthesized method 'Goo::Goo()' first required here utility/nonderivable.hpp: In destructor 'Goo::~Goo()': utility/nonderivable.hpp:30: error: 'boost::nonderivable_helper::~nonderivable_helper()' is protected main.cpp:14: error: within this context main.cpp: In function 'int main()': main.cpp:26: note: synthesized method 'Goo::~Goo()' first required here Best regards, Manuel Fiorelli

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[Report] 57 regressions on RC_1_34_0 (2007-03-05)
by Douglas Gregor 05 Mar '07

05 Mar '07

Boost Regression test failures Report time: 2007-03-05T07:58:30Z 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… 57 failures in 9 libraries graph (4) iostreams (7) math (1) numeric/interval (1) optional (12) parameter (1) python (27) regex (1) test (3) |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 |math| common_factor_test: msvc-6.5 |numeric/interval| test_float: msvc-7.1_stlport4 |optional| optional_test: darwin-4.0.1 gcc-3.4.5_linux gcc-3.4.5_linux_x86_64 gcc-4.0.3_linux gcc-4.1.0_linux gcc-4.1.0_linux_x86_64 gcc-4.1.1_sunos_i86pc hp_cxx-71_006_tru64 msvc-6.5 msvc-7.0 optional_test_ref_fail2: msvc-7.1 msvc-8.0 |parameter| python_test: gcc-cygwin-3.4.4 |python| bases: intel-linux-9.0 exec: intel-linux-9.0 import_: cw-9.4 darwin-4.0.1 gcc-3.2.3_linux gcc-3.3.6 gcc-3.3.6_linux gcc-3.4.5_linux gcc-3.4.5_linux_x86_64 gcc-4.0.3_linux gcc-4.1.0_linux gcc-4.1.0_linux_x86_64 gcc-4.1.1_sunos_i86pc hp_cxx-71_006_tru64 intel-linux-9.0 intel-linux-9.0 intel-vc71-win-9.1 msvc-6.5 msvc-7.0 msvc-7.1 msvc-7.1 msvc-8.0 msvc-8.0 msvc-8.0 pointee: intel-linux-9.0 pointer_type_id_test: intel-linux-9.0 upcast: intel-linux-9.0 |regex| regex_regress_threaded: msvc-8.0 |test| boost_check_equal_str: msvc-6.5 prg_exec_fail3: cw-9.4 test_tools_test: msvc-6.5

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Boost inspection notification (2007-03-05/RC_1_34_0) *X*
by Rene Rivera 05 Mar '07

05 Mar '07

Boost Inspection Report Run Date: 17:04:03 UTC, Monday 05 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) 195 problems reported Problem counts: 0 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 (1) 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| boost/archive/basic_streambuf_locale_saver.hpp: *N* name exceeds 31 characters boost/archive/impl/xml_wiarchive_impl.ipp: *U* unnamed namespace at line 53 boost/archive/iterators/remove_whitespace.hpp: *U* unnamed namespace at line 57 |bind| boost/bind/placeholders.hpp: *U* unnamed namespace at line 25 |boost-root| index.htm: *A* broken link: doc/hmtl/date_time.html *A* broken link: doc/hmtl/date_time/details.html#changes *A* broken link: more/BoostCon07.html |build| tools/build/v2/test/test_system.html: *A* unlinked file |date_time| libs/date_time/xmldoc/date_time_docs_howto.html: *A* unlinked file |doc| doc/html/boost_math/inverse_complex.html: *A* unlinked file doc/html/jam.html: *A* unlinked file |filesystem| libs/filesystem/doc/do-list.htm: *A* invalid URL (hardwired file): file://?/ *A* invalid URL (hardwired file): file://?/UNC/ libs/filesystem/doc/i18n.html: *A* broken link: convenience.htm#basic_recursive_directory_iterator *A* broken link: exception.htm *A* broken link: operations.htm *A* broken link: operations.htm#Do-the-right-thing *A* broken link: operations.htm#is_directory *A* broken link: operations.htm#is_file *A* broken link: operations.htm#status libs/filesystem/doc/index.htm: *A* broken link: ../build/Jamfile *A* broken link: convenience.htm *A* broken link: fstream.htm *A* broken link: operations.htm#create_directory *A* broken link: operations.htm#create_hard_link *A* broken link: operations.htm#current_path *A* broken link: operations.htm#directory_iterator *A* broken link: operations.htm#equivalent *A* broken link: operations.htm#file_size *A* broken link: operations.htm#initial_path *A* broken link: operations.htm#is_file *A* broken link: operations.htm#is_symlink *A* broken link: operations.htm#status *A* broken link: operations.htm#symlink_status *A* broken link: path.htm#Canonical *A* broken link: path.htm#Grammar *A* broken link: path.htm#Normalized *A* broken link: path.htm#default_name_check *A* broken link: path.htm#name_check_mechanism *A* broken link: path.htm#normalize *A* broken link: path.htm#operator_eq *A* broken link: path.htm#synopsis libs/filesystem/doc/portability_guide.htm: *A* broken link: path.htm#name_check_typedef libs/filesystem/doc/tr2_proposal.html: *A* invalid URL (hardwired file): file:///C|/boost/site/libs/filesystem/doc/operations.htm#complete_note |graph| 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/acknowledgments.html: *A* unlinked file 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/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 libs/python/doc/tutorial/index.html: *A* broken 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Boost inspection notification (2007-03-05/RC_1_34_0) *LC*
by Rene Rivera 05 Mar '07

05 Mar '07

Boost Inspection Report Run Date: 17:04:09 UTC, Monday 05 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* 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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Boost.Bimap - new name for the container?
by Matias Capeletto 05 Mar '07

05 Mar '07

Hi all, Thanks to John Maddok test of Boost.Bimap we discovered that some compilers (VS7.1 for example) may have a hard time recognizing between the "bimap" namespace and the "bimap" class if you try to compile the following code: using namespace boost::bimap; using namespace boost; typedef bimap<int, double> bm_type; If you switch the using statements this problem is gone in VS7.1 but persist in VS8 The following code compiles in VS7.1 using namespace boost; using namespace boost::bimap; typedef bimap<int, double> bm_type; You can use the container with the full namespace path in order to solve this problem: using namespace boost; using namespace boost::bimap; typedef ::boost::bimap::bimap<int, double> bm_type; Is this a problem that can be solved with a warning in the docs? Do you think it may be better to rename the "bimap" class to something else like "bidirectional_map"? Ideas are welcome Regards Matias

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Boost.Bimap - first/second and left/right
by Matias Capeletto 05 Mar '07

05 Mar '07

Hi all, I think we must discuss this issue together so we can settled it down. Lets analyze the rationale step by step. (1) Interface for the bidirectional mapping. That interface have to be compatible with existing code that work with standard maps. The best way IMHO to achieve this is that you can view the container from the two sides and see something compatible with std::map<X,Y> for the left one and with std::map<Y,X> for the right one. (2) This force us to use first/second notation for the left view (first is the left element and second the right one) and for the right view (where the names are inverted, first is the right element and second is the left one) If you have code like: template< class Pair > class PrintPair { void operator()( const Pair& p ) { std::cout << p.first << "-->" << p.second << std::endl; } } template< class Map > void print( const Map & m ) { std::for_each( m.begin(), m.end(), PrintPair< Map::value_type >() ); } typedef bimap<int,std::string> bm_type; bm_type bm; bm.insert( bm_type::value_type(1,"one") ); bm.insert( bm_type::value_type(2,"two") ); It will work with both sides views print( bm.left ); // 1 --> one // 2 --> two print( bm.right ); // one --> 1 // two --> 2 (3) (from other thread) For bm (the above view) we have some options: a) bm can be left without any special function and so force the user to write .left or .right to refer to it. b) bm can be the same as bm.left. This IMHO introduce an asymmetry to the interface. The left view became the more important than the right view. c) bm can be used for something new. Give the user a new view of the mapping: a set of relations. This design is symmetric. It forces the user to write .left to refer to the std::map<X,Y> view but this is a good thing, because is documented in the code what view is being used. This option is more elegant and powerful that the other ones. Because it is a new view we can use the symmetric left/right notation for it members so the design is complete. If we use first and second, the above view could be confused with the left view. Jeff has proposed to go with (a) In the current framework this is achieve using: typedef bimap<A,B,unconstrained_set_of_relation> bm_type; The library use (c) because it is very useful to be able to insert the elements or ask for the size, etc directly. And because it allows us to extend the framework by selecting different set of relations. So first/second are used in the side views and left/right in the above view. What do you think about this? Regards Matias

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