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

[type_traits]interest in inclusion of aligned_types in type_traits?
by Larry Evans 14 May '07

14 May '07

Query: The code here: http://boost-consulting.com/vault/index.php?&directory=variadic_templates in: aligned_types.2.zip(tr1/aligned_types.hpp) would seem to fit best in boost's type_traits, in particular, with those templates described here: http://www.boost.org/doc/html/boost_typetraits/category.html#boost_typetrai… Is there any interest in adding the aligned_types code there? Brief Description: The aligned_types template declaration is: template<class Tag, typename... Types> struct aligned_types; where: Tag is the "layout tag". Currently the only such tags are: variant tuple packed Types is a sequence of types (much like the current variant and boost sequences) and where the resulting nested type: aligned_types<Tag,Types...>::type is simply an instance of aligned_storage with sufficient memory to accommodate Types... in a layout specificed by Tag. For example, with Tag==variant, the aligned_storage is the same as that for the aligned_union<0,Types...> of: http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2006/n2140.pdf The other tags are for regular structs(tag=tuple) and packed structs(tag=packed). WARNING-Needs Variadic Template Compiler: The code uses Gregor's variadic template compiler: http://www.osl.iu.edu/~dgregor/cpp/variadic-templates.html hence, it can't be used with any other compiler. However, I'd think it could be converted to use the preprocessor methods used by much of boost::mpl and boost::fusion to approximate Gregor's variadic templates. Applications: Reuse in boost::variant: Around line 215 of: http://boost.cvs.sourceforge.net/boost/boost/boost/variant/variant.hpp?revi… there's make_storage whose nested type, is, AFAICT, the same as aligned_types<variant,Types...>::type. The one difference is that make_storage (from looking just at lines 233-235) calculates the alignment of the variant and the max of the individual alignements. However, as explained in: aligned_types.2.zip(libs/tr1/doc/aligned_struct_offsets.txt) least-common-multiple instead of max is needed to handle extended alignments. Thus, aligned_types<variant,Types...> could be used in place of the current variant's make_storage. Space efficient tuple without preprocessor: By using aligned_types<tuple,Types...>::type as a storage buffer for a tuple, and using the mpl::at_c specializations in aligned_types.2.zip(tr1/aligned_types.hpp) to access the subparts of this storage buffer corresponding to an element in Types..., a tuple implementation as space efficient as fusion's could be achieved without use of the boost preprocessor library.

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confused about uniform_01
by Neal Becker 14 May '07

14 May '07

I'm confused. Usually I want to share the state of 1 underlying rng between many distributions, to ensure good independence. So, for example: boost::variate_generator<rng_t&, boost::uniform_real<> > gen; But uniform_01 holds a rng member: base_type _rng; which is not declared as a reference. But, I _can't_ make it a reference, by doing: boost::uniform_01<rng_t&> eng; Because uniform_01 says: base_type& base() { return _rng; } Which would then be && and won't compile. What am I not understanding?

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[GIL] Loading a PNG from a stream
by Michael Marcin 14 May '07

14 May '07

Hello, I have the need to load a PNG from a generic input stream that has a similar interface (i.e. has a read, operator ! and fail with the same signature/semantics as std::istream). The png reading extensions don't appear to be able to load from anything other than a FILE*. In a library as modern as GIL I'm sort of suprised there is apparently no way to load from a generic stream. Anyone have an idea how to make this happen? Perhaps there is another PNG library written in C++ or a wrapper around the C libpng? Thanks, Michael Marcin

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Boost inspection notification (2007-05-14/RC_1_34_0) *X*
by Rene Rivera 14 May '07

14 May '07

Boost Inspection Report Run Date: 16:06:29 UTC, Monday 14 May 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 22 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 (1) build (1) date_time (1) doc (2) filesystem (33) graph (2) iostreams (3) 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| 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| 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Boost inspection notification (2007-05-14/RC_1_34_0) *LC*
by Rene Rivera 14 May '07

14 May '07

Boost Inspection Report Run Date: 16:06:36 UTC, Monday 14 May 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) 1051 problems reported Problem counts: 653 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 (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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[Report] 0 regressions on RC_1_34_0 (2007-05-14)
by Douglas Gregor 14 May '07

14 May '07

Boost Regression test failures Report time: 2007-05-13T15:52:15Z 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… No failures! Yay!

1 0

[BoostCon 07] Some First Pictures from Aspen
by Jeff Garland 14 May '07

14 May '07

I know some of you were looking for 'blogs' from BoostCon. I won't promise much on the text side, but I borrowed my wife's new camera and will be taking some photos during the conference and posting them. Thru a variety of circumstances I arrived a day early in Aspen, so I've had a chance to look around a bit. These are photos of the outside of the Aspen Institute and Aspen Meadows hotel. I think the word 'idyllic' pretty much sums up the surroundings! http://www.crystalclearsoftware.com/boostcon_07/FirstPictures/index.html Jeff

4 3

[1.34.0] build_dist.bat not work if PATH environment variable include ")"
by Atry 14 May '07

14 May '07

One of my PATH environment variable is "C:\Program Files\Microsoft DirectX SDK (April 2006)\Utilities\Bin\x86", and build_dist.bat not work. I modified my PATH to "C:\Program Files\MICROS~4\Utilities\Bin\x86" and it worked.

2 1

[typeof] -- BOOST_TYPEOF(*this) ...
by John Femiani 14 May '07

14 May '07

Hi all, I wrote a little macro that uses BOOST_TYPEOF to determine the type of one of its arguments, but it fails when I pass (*this) as an argument in vc8. I forced emulation because, according to the docs, vc8 does not seem to have the bug that let other vc compilers actually support native typeof. I don't know the internals of the TYPEOF library well enough to diagnose the problem, but the error is easy to produce. #define BOOST_TYPEOF_COMPLIANT #include <boost/typeof/typeof.hpp> #include BOOST_TYPEOF_INCREMENT_REGISTRATION_GROUP() template<class Inner> struct A; BOOST_TYPEOF_REGISTER_TEMPLATE(A,1); #define USES_TYPEOF_IN_A_MACRO(X) \ { \ BOOST_TYPEOF_TPL(X) &ref = X; \ BOOST_TYPEOF_TPL(X)::inner_t inner = X.inner(); \ } template<class Inner> struct A{ typedef Inner inner_t; inner_t inner() { return Inner(); } void do_something() { A<Inner>& star_this = *this; USES_TYPEOF_IN_A_MACRO(star_this); USES_TYPEOF_IN_A_MACRO(*this); //ERROR! } }; void main(){ A<int> a; a.do_something(); }; If there is any way to accomplish the type of access I am attempting from inside a macro I would really appreciate it (in my use case macros seem to be absolutely necessary for other reasons). As you can see from the example it is possible to avoid the problem by creating a reference to *this and passing that, but I do not like this in principle because too many caveats make the macro difficult to use. John

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just test, please ignore
by Alexandre Karev 14 May '07

14 May '07

-- Alexandre Karev PH/CERN Alexandre.Karev(a)cern.ch "The most difficult thing is to prove the evident". Folk wisdom.

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