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[decimal] Proposed portable implementation of std::decimal
by Josh Quigley 19 Apr '12

19 Apr '12

Hi, I believe that a portable implementation of the proposed std::decimal (eg Decimal Types for C++ <http://tiny.cc/63ovcw> for older draft) would be useful. Since the standard specifies a class, a library should be able to achieve close to full compliance. At the moment I believe only gcc supports this. I'm currently working on this for my own purposes, and if there is sufficient interest (and guidance!) might try to expand it into a draft submission. Roadmap: 1. Implement std::decimal (see gcc version, for example) using Intel FP Decimal, DecNumber, native gcc, (maybe .NET Decimal depending on how close it is to complying with interface) 2. Some preprocessor trickery to make it easy to compile all implementation as separate classes (eg extension::decimal::Intel::decimal64), or a given implementation as the 'one true' class (extension::decimal::decimal64). This means unit tests and performance tests can be written using one implementation against another, and for production code, a given implementation can be used under the hood depending on the architecture. 3. Create performance and standards-compliance benchmarks for implementations. 4. Choose default implementation for each supported architecture, based on benchmarks. The above is a personal roadmap, of which a subset may be of interest to the boost community. Please let me know if you think this would be of value, and in particular if you would like to be involved in creating / testing / using this. Regards, Josh.

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Google Groups
by Mark Snelling 19 Apr '12

19 Apr '12

Hi, Has anyone noticed that the Google Groups feeds of both boost-users and boost-devel have stopped updating? There was this posting to the Boost devel archive on the 18th regarding message bounces https://groups.google.com/forum/?fromgroups#!topic/boost-devel-archive/Ip24… Mark.

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Re: [boost] [decimal] Proposed portable implementation of std::decimal
by Josh Quigley 19 Apr '12

19 Apr '12

Thanks for link to more recent draft. I've finished a rough implementation using the Intel lib, and am currently working on unit tests to at least cover the std::decimal interface. What is the preferred way to share this (when ready)? Josh.

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[Serialization] How to force an archive to store true_type even if it is this_type?
by nico 18 Apr '12

18 Apr '12

Hello. When we serialize a polymorphic object, an archive stores the information about true_type (i.e. the concrete type of an object) only if it is not equal to this_type (i.e. the type of the serialized object). I.e. : the type of the serialized object is stored only if it is serialized from a base class. How can I force the archive to always store the type? Let's illustrate with a sample, I'm not sure the above text is so obvious...: Let's have 2 classes serializable: class Base { ... }; class Leaf : public Base { ... }; If I do : std::stringstream ios(std::ios_base::binary | std::ios_base::out | std::ios_base::in); * Base** b = new *Leaf*(); boost::archive::text_oarchive ar(ios); ar & b; Then the archive contains: 22 serialization::archive 9 0 4 *Leaf* 1 0 0 0 0 0 0 0 0 It contains the Leaf concrete type information. However if I do : * Leaf** b = new *Leaf*(); boost::archive::text_oarchive ar(ios); ar & b; Then the archive contains: 22 serialization::archive 9 0 1 0 0 0 0 0 0 0 0 It doesn't contain Lef type info. How can I produce an archive WITH the true_type all the type? I search 2 ways: - calling a method of archive type (register_type, save_pointer, ...) unsuccessfully - directly change the boost/archive/detail/oserializer.hpp file: in struct polymorphic, in function template<class T> static void save(Archive &ar, T & t) I comment out if(*this_type == *true_type){ const basic_pointer_oserializer * bpos = register_type(ar, t); ar.save_pointer(vp, bpos); return; } unsuccessfully. Thank you for help. Nicolas. PS : a word about why I'm trying to do that. When the true_type is "registered" (I'm not sure register is the right word), we can deserialize the object to any base class. Exemple: SERIALIZATION: Leaf* leaf = new Leaf(); ar & leaf; SERIALIZATION: Base* b = 0; ar & b; // would work only if Leaf has been saved in the archive as true_type For tools in a multi-team project, it' powerfull : data for tests has been serialized by a team, and the other team can deserialize, let's say an image, to the interface class IImage without asking: what was the true_tyep : an Image3D, an AImage2D, an Image2DRGB, an Image2DRAW, and so on.

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[disjoint_sets] 1.49.0 docs out-of-date? pending?
by Jeffrey Lee Hellrung, Jr. 18 Apr '12

18 Apr '12

I noticed that http://www.boost.org/doc/libs/1_49_0/libs/disjoint_sets/disjoint_sets.html references boost/disjoint_sets.hpp but, AFAICS, no such file exists; however, clicking on the file nonetheless redirects to boost/pending/disjoint_sets.hpp which presumably is the intended reference. So, aside from what looks like a slight error in the present disjoint_sets docs, what is the purpose of this pending directory? I had never noticed it before and I don't remember stumbling upon a reference to it until now. Looks like it contains a hodgepodge of miscellaneous headers... Thanks, - Jeff

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[test] Am I supposed to be able to use std::wstring in BOOST_CHECK_EQUAL?
by Michael Kochetkov 18 Apr '12

18 Apr '12

Hello, Am I supposed to be able to use std::wstring in BOOST_CHECK_EQUAL? I.e. std::wstring s1,s2; BOOST_CHECK_EQUAL(s1,s2); -- Michael Kochetkov

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regression test link broken?
by lcaminiti 18 Apr '12

18 Apr '12

Hello all, Are the regression tests broken? When I go to: http://www.boost.org/development/tests/trunk/developer/summary.html I get: Error extracting file: The specified zipfile was not found. Same for both trunk and release tests. I hope it wasn't me ;) --Lorenzo -- View this message in context: http://boost.2283326.n4.nabble.com/boost-regression-test-link-broken-tp4565… Sent from the Boost - Dev mailing list archive at Nabble.com.

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[type_traits][exception][interlocked][smart_ptr] Intel XE 2011 SP1 compiler warnings
by Beman Dawes 18 Apr '12

18 Apr '12

Compiling libs/test/src/execution_monitor.cpp is producing a lot of warnings from the Intel XE 2011 SP1 compiler for Windows: [type_traits] ..\..\..\boost/type_traits/detail/is_mem_fun_pointer_tester.hpp(74-2608): remark #693: calling convention specified here is ignored yes_type is_mem_fun_pointer_tester(R (__stdcall T::*const volatile*)( ...)); with the error marker under the start of __stdcall. There are about a gazillion lines with the same error. [exception] ..\..\..\boost/exception/exception.hpp(258-260): remark #367: duplicate friend declaration friend struct exception_detail::get_info<throw_function>; [interlocked] ..\..\..\boost/detail/interlocked.hpp(79-83): warning #1879: unimplemented pragma ignored # pragma intrinsic( _InterlockedIncrement ) [smart_ptr] ..\..\..\boost/smart_ptr/detail/yield_k.hpp(33): warning #1879: unimplemented pragma ignored #pragma intrinsic( _mm_pause ) It would be nice to clear these warnings. Thanks, --Beman

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[math] Numeric constants docs out of date?
by Beman Dawes 17 Apr '12

17 Apr '12

The docs for Numeric Constants seems out-of-date compared to the <boost/math/constants/constants.hpp> header. See http://www.boost.org/doc/libs/1_49_0/libs/math/doc/sf_and_dist/html/math_to… For example, the docs list 15 constants, but the header supplies 65 or so constants. Beyond simply missing some functions, the description is so scanty it looks like it may be for a much less capable older version of the header. Am I missing something? --Beman

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Re: [boost] [Boost-commit] svn:boost r78033 - trunk/libs/context/src
by Joshua Boyce 17 Apr '12

17 Apr '12

On Tue, Apr 17, 2012 at 5:31 PM, <oliver.kowalke(a)gmx.de> wrote: > Author: olli > Date: 2012-04-17 03:31:34 EDT (Tue, 17 Apr 2012) > New Revision: 78033 > URL: http://svn.boost.org/trac/boost/changeset/78033 > > Log: > icontext: use snprintf in seh handler > > Text files modified: > trunk/libs/context/src/seh.cpp | 5 ++--- > 1 files changed, 2 insertions(+), 3 deletions(-) > > Modified: trunk/libs/context/src/seh.cpp > > ============================================================================== > --- trunk/libs/context/src/seh.cpp (original) > +++ trunk/libs/context/src/seh.cpp 2012-04-17 03:31:34 EDT (Tue, 17 > Apr 2012) > @@ -26,7 +26,7 @@ > { > const char * accessType = ( info[0]) ? "writing" : "reading"; > const ULONG_PTR address = info[1]; > - _snprintf_s( description, len, _TRUNCATE, "Access violation %s > 0x%08X", accessType, address); > + snprintf( description, len, "Access violation %s 0x%08X", > accessType, address); > return description; > } > case EXCEPTION_DATATYPE_MISALIGNMENT: return "Datatype > misalignment"; > @@ -52,8 +52,7 @@ > case EXCEPTION_INVALID_HANDLE: return "Invalid handle"; > } > > - _snprintf_s( description, len, _TRUNCATE, "Unknown (0x%08X)", code); > - > + snprintf( description, len, "Unknown (0x%08X)", code); > return description; > } > > _______________________________________________ > Boost-commit mailing list > Boost-commit(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-commit This breaks building under MSVC which does not have 'snprintf', only '_snprintf'. http://msdn.microsoft.com/en-us/library/2ts7cx93.aspx

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