May 2006 - Boost - lists.boost.org

[Review][PQS] Physical Quantities System review (May 31 through June 9)
by fred bertsch 09 Jun '06

09 Jun '06

The review of Andy Little's Physical Quantities System begins today, May 31, 2006, and continues through June 9, 2006. Download: pqs_3_1_0 is the Official Boost Review version of pqs. (Please note that pqs_3_1_0 has a bug in one header. This can be either patched according to the latest release notes, "relnotes.txt" available from http://tinyurl.com/7m5l8 or alternatively download pqs_3_1_1, which is basically equivalent to pqs_3_1_0, except the bug has been fixed there. Description PQS (Physical Quantities System) is designed to replace the use of floating point types for modelling physical quantities in C++ programs. Advantages include automated dimensional analysis checking, automatic unit conversions, self documentation of code and uniform mechanisms for dealing with physical quantities overall, allowing better interoperability, accuracy and repeatability among engineering, physics and trade applications. The library will ultimately consist of various types for modelling quantities in different situations. The t1_quantity, which is the first to be implemented, performs all its dimensional analysis checks as well as parts of its unit conversion calculations, at compile time rather than runtime, for maximum efficiency. PQS is designed with a firm commitment to the SI system, as being the internationally agreed preferred system of units. A reasonable selection of common quantities and units is included in the review version for demonstration purposes. The intent is to expand on this to include all the common quantities mentioned in Appendix B.8 and B.9 of the NIST SI document: http://physics.nist.gov/cuu/pdf/sp811.pdf The library also defines a selection of physical constants again intended as a flavour of the constants that would be included in a full library implementation as outlined in: http://physics.nist.gov/cuu/pdf/chart1.pdf Review questions: Please always explicitly state in your review, whether you think the library should be accepted into Boost. You might want to comment on the following questions: - What is your evaluation of the design? - What is your evaluation of the implementation? - What is your evaluation of the documentation? - What is your evaluation of the potential usefulness of the library? - Did you try to use the library? With what compiler? Did you have any problems? - How much effort did you put into your evaluation? A glance? A quick reading? In-depth study? - Are you knowledgeable about the problem domain? -Fred Bertsch -- F

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Re: [boost] [serialization] MSVC8 runtime check error
by Reece Dunn 09 Jun '06

09 Jun '06

John Reid wrote: > > I'm getting a runtime check error from MSVC8 in the following code > checked out from cvs_head: > > serialization/collections_load_imp.hpp > line 116 > > ... > > template<class Archive, class Container, class InputFunction, class R> > inline void load_collection(Archive & ar, Container &s) > { > s.clear(); > // retrieve number of elements > unsigned int count; > unsigned int item_version; > ar >> BOOST_SERIALIZATION_NVP(count); > if(3 < ar.get_library_version()){ > ar >> BOOST_SERIALIZATION_NVP(item_version); > } > R rx; > rx(s, count); > InputFunction ifunc; > while(count-- > 0){ > ifunc(ar, s, item_version); > } > } > > ... > > The debugger breaks every time ifunc() is called which is frustrating to > say the least. > > If load_collection() is wrapped with > > #pragma runtime_checks( "u", off ) > ... > #pragma runtime_checks( "u", restore ) > > it doesn't help - perhaps I've rebuilt it incorrectly, perhaps the > pragma needs to be around where the code is instantiated. I managed to > get around the problem by assigning 0 to item_version. What happens when you break into the debugger. VC8 supports range checked iterators, dereferencing an invalid iterator, etc. What is the exception/assert message being generated? Can you use the VC8 debugger and see what values each of the variables are at the point where the assert/exception was generated? Is there any information you can gather by looking up the callstack? > Has anyone specifically chosen to turn runtime checks on for debug > builds with MSVC8 or is this just the default? VC8 has additional error checking when compiling for debug. - Reece _________________________________________________________________ Express yourself instantly with MSN Messenger! Download today it's FREE! http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/

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Infinite precision integer draft
by Maarten Kronenburg 05 Jun '06

05 Jun '06

In the boost vault http://boost-consulting.com/vault/ under Math - Numerics the document infintdraft.pdf contains the Proposal for an Infinite Precision Integer for Library Technical Report 2, Draft. Any comments are welcome. Regards, Maarten.

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Endian library - request for comments
by Beman Dawes 04 Jun '06

04 Jun '06

Back in 1999 and 2000, there was discussion of a Boost Endian library to provided portable big and little endian integer types. I've dusted off some old code from Darin Adler, gotten his permission to use the new Boost license, and have put together a library. A zip file of the whole library is available at http://mysite.verizon.net/~beman/endian.zip The docs can be read at http://mysite.verizon.net/~beman/endian.html Comments welcome! --Beman

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Submission of an application to Who is Using Boost
by Boris Kolpackov 03 Jun '06

03 Jun '06

Hi, I would like to submit the following application for inclusion into the "Open Source Boost" section of the Who is Using Boost page: Application name: CodeSynthesis XML Schema to C++ Data Binding Compiler (XSD) Application page: http://codesynthesis.com/products/xsd/ Company name: Code Synthesis Tools CC Company page: http://codesynthesis.com Description: CodeSynthesis XML Schema to C++ Data Binding Compiler (XSD) is an open-source, cross-platform XML Data Binding implementation for C++. Provided with an XML instance specification (XML Schema), it generates C++ classes that represent the given vocabulary as well as parsing and serialization code. You can then access the data stored in XML using types and functions that semantically correspond to your application domain rather than dealing with elements, attributes, and text in a direct representation of XML such as DOM or SAX. XSD uses the Regex and Filesystem libraries from Boost. Regex is used to perform transformations on file, type and member names. Filesystem is used to capture and manipulate XML Schema include and import paths. Additionally, we are planning to provide an optional mapping of XML Schema date and time types to C++ types from the Boost Date Time library. thanks, -boris

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[filesystem][program_options][serialization][test] from comp.lang.c++.moderated
by David Abrahams 02 Jun '06

02 Jun '06

It seems as though the OP may not be totally crazy, so we should evaluate his comments and see if the issues can be (or have been) addressed. The article is of course bad publicity for Boost, and I'd like to demonstrate responsiveness if possible. -- Dave Abrahams Boost Consulting www.boost-consulting.com

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Infinite precision integer draft
by Maarten Kronenburg 02 Jun '06

02 Jun '06

If you don't mind I start a new thread here. The unsigned infinite precision integer is different from the base type unsigned int, which is actually a modular integer with modulus 2^n. Therefore two integer derived classes are needed: unsigned_integer and modular_integer. The unsigned_integer is an infinite precision integer which can only be positive or zero. The negate() of a non-zero unsigned_integer will always throw an exception. A subtraction which results in a negative value will do the same; therefore in my opinion there is no fundamental problem with this, as negation is subtraction from zero. The modular_integer has a static method static void set_modulus( const integer & ). When the modulus is not set, it is zero, in that case the modular_integer is identical to integer. Users that like an unsigned integer with a negate() that always works, will have to use a modular_integer and set its modulus to a positive value. In the document I will specify unsigned_integer and modular_integer, and thus implementations can provide them. Regards, Maarten.

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[tr2][filesystem][asio] header <boost/system_error.hpp> roadmap?
by Beman Dawes 01 Jun '06

01 Jun '06

The Filesystem proposal accepted by the C++ committee's LWG for TR2 includes components for reporting system errors from library functions that depend on operating system API's. There are error_code and system_error classes, four free functions, etc. They will go in a TR2 header named <system_error>. Presumably for Boost it will be called <boost/system_error.hpp> or similar. See http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1975.html#Diagnost… Boost.Filesystem is the first Boost library to use <boost/system_error.hpp>. Chris Kohlhoff is planning to use it in asio, and has suggested improvements that I'll incorporate. Presumably the header will be used by other Boost libraries in the future. What should the roadmap be for moving this header into Boost? Should it be a separate library? Seems smallish for that. Does it need a formal review? A mini-review? Is it OK if I put in CVS now in boost/detail? Opinions? --Beman

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Bug list status
by Marshall Clow 01 Jun '06

01 Jun '06

Low point: 54 bugs Time before: 60 bugs Last time: 61 bugs Today: 66 bugs Let's try to knock these bugs down for 1.34! If anyone would like to integrate the "Fixes for build on IBM pSeries for AIX and Linux" currently assigned to "Nobody", please let me know! [ In fact, please take a look at the "nobody" bugs, and let me know where they should be assigned ] If you think that a bug has been assigned incorrectly, please let me know. Thanks! Bug counts per assignee: Nobody 8 Jeff Garland (az_sw_dude) 7 Jeremy Siek 6 Doug Gregor 5 Stephen Cleary (shammah) 5 Beman Dawes 3 Eric Friedman (ebf) 3 Mike Glassford 3 Samuel Kremp 3 John R. Bandela 2 Joel de guzman (djowel) 2 Jens Maurer 2 Thorsten Ottosen (nesotto) 2 Rene Rivera (grafik) 2 Roland Schwarz (speedsnail) 2 Jonathan Turkanis 2 Marshall Clow 1 Aleskey Gurtovoy (agurtovoy) 1 Kevlin Henney 1 Hubert Holin 1 Jaakko Jurvi (urzuga) 1 John Maddock 1 Vladimir Prus 1 Daniel Wallin 1 Darryl Walker 1 Here are the bugs, sorted by assignee: Assignee: agurtovoy <http://sourceforge.net/users/agurtovoy/> Summary: mpl::remove compile error with gcc 4.1.0 Bug #: 1453180 <http://sourceforge.net/tracker/index.php?func=detail&aid=1453180&group_id=7…> Assignee: az_sw_dude <http://sourceforge.net/users/az_sw_dude/> Summary: wrong usage of ios_base::narrow Bug #: 989487 <http://sourceforge.net/tracker/index.php?func=detail&aid=989487&group_id=75…> Assignee: az_sw_dude <http://sourceforge.net/users/az_sw_dude/> Summary: date_time type conversion warning Bug #: 1069225 <http://sourceforge.net/tracker/index.php?func=detail&aid=1069225&group_id=7…> Assignee: az_sw_dude <http://sourceforge.net/users/az_sw_dude/> Summary: local_adjustor::utc_to_local throws 'Time label invalid' Bug #: 1220011 <http://sourceforge.net/tracker/index.php?func=detail&aid=1220011&group_id=7…> Assignee: az_sw_dude <http://sourceforge.net/users/az_sw_dude/> Summary: bjam don`t copy lib & dll files to stage Bug #: 1402743 <http://sourceforge.net/tracker/index.php?func=detail&aid=1402743&group_id=7…> Assignee: az_sw_dude <http://sourceforge.net/users/az_sw_dude/> Summary: from_ftime incorrectly processes FILETIME filled with zeros Bug #: 1471025 <http://sourceforge.net/tracker/index.php?func=detail&aid=1471025&group_id=7…> Assignee: az_sw_dude <http://sourceforge.net/users/az_sw_dude/> Summary: time_from_string silently misreads date Bug #: 1482703 <http://sourceforge.net/tracker/index.php?func=detail&aid=1482703&group_id=7…> Assignee: az_sw_dude <http://sourceforge.net/users/az_sw_dude/> Summary: memory leak with boost::gregorian::date_facet Bug #: 1486232 <http://sourceforge.net/tracker/index.php?func=detail&aid=1486232&group_id=7…> Assignee: beman_dawes <http://sourceforge.net/users/beman_dawes/> Summary: linker error mingw 3.4.5 Bug #: 1426819 <http://sourceforge.net/tracker/index.php?func=detail&aid=1426819&group_id=7…> Assignee: beman_dawes <http://sourceforge.net/users/beman_dawes/> Summary: VC8 can't find windows.h even though environment is correct! Bug #: 1468124 <http://sourceforge.net/tracker/index.php?func=detail&aid=1468124&group_id=7…> Assignee: beman_dawes <http://sourceforge.net/users/beman_dawes/> Summary: Log level names wrong in documentation Bug #: 1475886 <http://sourceforge.net/tracker/index.php?func=detail&aid=1475886&group_id=7…> Assignee: daniel_wallin <http://sourceforge.net/users/daniel_wallin/> Summary: [Parameter] Docco error section 2.7.2 Bug #: 1378446 <http://sourceforge.net/tracker/index.php?func=detail&aid=1378446&group_id=7…> Assignee: dgregor <http://sourceforge.net/users/dgregor/> Summary: LEDA graph adaptors do not handle hidden nodes properly Bug #: 1168431 <http://sourceforge.net/tracker/index.php?func=detail&aid=1168431&group_id=7…> Assignee: dgregor <http://sourceforge.net/users/dgregor/> Summary: random_vertex/random_edge are unnecessarily inefficient Bug #: 1204684 <http://sourceforge.net/tracker/index.php?func=detail&aid=1204684&group_id=7…> Assignee: dgregor <http://sourceforge.net/users/dgregor/> Summary: Document copy_component Bug #: 1204688 <http://sourceforge.net/tracker/index.php?func=detail&aid=1204688&group_id=7…> Assignee: dgregor <http://sourceforge.net/users/dgregor/> Summary: reverse_graph and constness of property maps Bug #: 1246336 <http://sourceforge.net/tracker/index.php?func=detail&aid=1246336&group_id=7…> Assignee: dgregor <http://sourceforge.net/users/dgregor/> Summary: Bundled graph properties Bug #: 1420498 <http://sourceforge.net/tracker/index.php?func=detail&aid=1420498&group_id=7…> Assignee: djowel <http://sourceforge.net/users/djowel/> Summary: Miss ' = ParserT()' Bug #: 907299 <http://sourceforge.net/tracker/index.php?func=detail&aid=907299&group_id=75…> Assignee: djowel <http://sourceforge.net/users/djowel/> Summary: spirit insert_key_actor.hpp Bug #: 1059936 <http://sourceforge.net/tracker/index.php?func=detail&aid=1059936&group_id=7…> Assignee: dlwalker <http://sourceforge.net/users/dlwalker/> Summary: boost/crc.hpp uses non-standard conforming syntax Bug #: 1478435 <http://sourceforge.net/tracker/index.php?func=detail&aid=1478435&group_id=7…> Assignee: ebf <http://sourceforge.net/users/ebf/> Summary: boost::blank - missing operators Bug #: 1191356 <http://sourceforge.net/tracker/index.php?func=detail&aid=1191356&group_id=7…> Assignee: ebf <http://sourceforge.net/users/ebf/> Summary: [variant] Bug in recursive_wrapper_fwd.hpp Bug #: 1359257 <http://sourceforge.net/tracker/index.php?func=detail&aid=1359257&group_id=7…> Assignee: ebf <http://sourceforge.net/users/ebf/> Summary: ambiguous overloads in boost::variant source code Bug #: 1456780 <http://sourceforge.net/tracker/index.php?func=detail&aid=1456780&group_id=7…> Assignee: glassfordm <http://sourceforge.net/users/glassfordm/> Summary: condition::timed_wait doesnt take amount of time to wait Bug #: 1468789 <http://sourceforge.net/tracker/index.php?func=detail&aid=1468789&group_id=7…> Assignee: glassfordm <http://sourceforge.net/users/glassfordm/> Summary: object destructor called four times when using thread Bug #: 1477354 <http://sourceforge.net/tracker/index.php?func=detail&aid=1477354&group_id=7…> Assignee: glassfordm <http://sourceforge.net/users/glassfordm/> Summary: USES_CONVERSION is used in once.cpp Bug #: 1489362 <http://sourceforge.net/tracker/index.php?func=detail&aid=1489362&group_id=7…> Assignee: grafik <http://sourceforge.net/users/grafik/> Summary: boost jam problem with parallel builds Bug #: 1234224 <http://sourceforge.net/tracker/index.php?func=detail&aid=1234224&group_id=7…> Assignee: grafik <http://sourceforge.net/users/grafik/> Summary: boost.build needs fixes for HP/UX Bug #: 1395924 <http://sourceforge.net/tracker/index.php?func=detail&aid=1395924&group_id=7…> Assignee: hubert_holin <http://sourceforge.net/users/hubert_holin/> Summary: Cannot compile octonion_test.cpp because of bug in sinc.hpp Bug #: 751289 <http://sourceforge.net/tracker/index.php?func=detail&aid=751289&group_id=75…> Assignee: jbandela <http://sourceforge.net/users/jbandela/> Summary: Compiler error for tokenizer on Solaris Bug #: 976241 <http://sourceforge.net/tracker/index.php?func=detail&aid=976241&group_id=75…> Assignee: jbandela <http://sourceforge.net/users/jbandela/> Summary: token_iterator::at_end() result is inversed Bug #: 1338326 <http://sourceforge.net/tracker/index.php?func=detail&aid=1338326&group_id=7…> Assignee: jmaurer <http://sourceforge.net/users/jmaurer/> Summary: Diff in state of mersenne_twister gen between GCC3.41 & CW9 Bug #: 1115124 <http://sourceforge.net/tracker/index.php?func=detail&aid=1115124&group_id=7…> Assignee: jmaurer <http://sourceforge.net/users/jmaurer/> Summary: uniform_01 copies engine instead of using a reference Bug #: 1464566 <http://sourceforge.net/tracker/index.php?func=detail&aid=1464566&group_id=7…> Assignee: johnmaddock <http://sourceforge.net/users/johnmaddock/> Summary: Adding boost::is_complex to type_traits.hpp Bug #: 1315712 <http://sourceforge.net/tracker/index.php?func=detail&aid=1315712&group_id=7…> Assignee: jsiek <http://sourceforge.net/users/jsiek/> Summary: invalid result for File Dependency Examp Bug #: 551110 <http://sourceforge.net/tracker/index.php?func=detail&aid=551110&group_id=75…> Assignee: jsiek <http://sourceforge.net/users/jsiek/> Summary: Spelling of Edmonds-Karp-Algorithm Bug #: 1226292 <http://sourceforge.net/tracker/index.php?func=detail&aid=1226292&group_id=7…> Assignee: jsiek <http://sourceforge.net/users/jsiek/> Summary: g++ v3.2.3 inker error for read_graphviz ih boost v1.33.1 Bug #: 1378907 <http://sourceforge.net/tracker/index.php?func=detail&aid=1378907&group_id=7…> Assignee: jsiek <http://sourceforge.net/users/jsiek/> Summary: Calling subgraph::global_to_local on a root graph Bug #: 1444271 <http://sourceforge.net/tracker/index.php?func=detail&aid=1444271&group_id=7…> Assignee: jsiek <http://sourceforge.net/users/jsiek/> Summary: Calling subgraph::global_to_local on a root graph Bug #: 1444293 <http://sourceforge.net/tracker/index.php?func=detail&aid=1444293&group_id=7…> Assignee: jsiek <http://sourceforge.net/users/jsiek/> Summary: strange compiling problem for transitive_closure Bug #: 1489545 <http://sourceforge.net/tracker/index.php?func=detail&aid=1489545&group_id=7…> Assignee: kevlin <http://sourceforge.net/users/kevlin/> Summary: lexical_cast & pure virtual functions & VC 8 STL Bug #: 1358600 <http://sourceforge.net/tracker/index.php?func=detail&aid=1358600&group_id=7…> Assignee: mclow <http://sourceforge.net/users/mclow/> Summary: Solaris - once.cpp compile error Bug #: 549162 <http://sourceforge.net/tracker/index.php?func=detail&aid=549162&group_id=75…> Assignee: nesotto <http://sourceforge.net/users/nesotto/> Summary: boost.range and 'const char[]'. Bug #: 1272315 <http://sourceforge.net/tracker/index.php?func=detail&aid=1272315&group_id=7…> Assignee: nesotto <http://sourceforge.net/users/nesotto/> Summary: [Boost.Range]boost::const_begin calls non-qualified 'begin' Bug #: 1361686 <http://sourceforge.net/tracker/index.php?func=detail&aid=1361686&group_id=7…> Assignee: nobody Summary: Fixes for build on IBM pSeries for AIX and Linux Bug #: 1446471 <http://sourceforge.net/tracker/index.php?func=detail&aid=1446471&group_id=7…> Assignee: nobody Summary: Non-basic-source-character-set characters conflict with MSVC Bug #: 1461533 <http://sourceforge.net/tracker/index.php?func=detail&aid=1461533&group_id=7…> Assignee: nobody Summary: Boost Jam, and non english directorys Bug #: 1480900 <http://sourceforge.net/tracker/index.php?func=detail&aid=1480900&group_id=7…> Assignee: nobody Summary: Numeric Conversion Documentation minor bug Bug #: 1480954 <http://sourceforge.net/tracker/index.php?func=detail&aid=1480954&group_id=7…> Assignee: nobody Summary: insignificant boost::array bug Bug #: 1484104 <http://sourceforge.net/tracker/index.php?func=detail&aid=1484104&group_id=7…> Assignee: nobody Summary: bug in boost::range_detail Bug #: 1484477 <http://sourceforge.net/tracker/index.php?func=detail&aid=1484477&group_id=7…> Assignee: nobody Summary: program_options: format_paragraph assert fails on long line Bug #: 1485069 <http://sourceforge.net/tracker/index.php?func=detail&aid=1485069&group_id=7…> Assignee: nobody Summary: boost 1.33.1 build error Bug #: 1487256 <http://sourceforge.net/tracker/index.php?func=detail&aid=1487256&group_id=7…> Assignee: samuel_k <http://sourceforge.net/users/samuel_k/> Summary: format: assert when parsing invalid pattern Bug #: 1326132 <http://sourceforge.net/tracker/index.php?func=detail&aid=1326132&group_id=7…> Assignee: samuel_k <http://sourceforge.net/users/samuel_k/> Summary: boost::format parse method doesn't work Bug #: 1439607 <http://sourceforge.net/tracker/index.php?func=detail&aid=1439607&group_id=7…> Assignee: samuel_k <http://sourceforge.net/users/samuel_k/> Summary: 64 bit compile warning/error for boost::format Bug #: 1451470 <http://sourceforge.net/tracker/index.php?func=detail&aid=1451470&group_id=7…> Assignee: shammah <http://sourceforge.net/users/shammah/> Summary: ct_gcd_lcm.hpp compilation error Bug #: 558174 <http://sourceforge.net/tracker/index.php?func=detail&aid=558174&group_id=75…> Assignee: shammah <http://sourceforge.net/users/shammah/> Summary: pool::purge_memory() does not reset next_size Bug #: 984124 <http://sourceforge.net/tracker/index.php?func=detail&aid=984124&group_id=75…> Assignee: shammah <http://sourceforge.net/users/shammah/> Summary: Borland compiler error with Pool, boost::pool_allocator Bug #: 988124 <http://sourceforge.net/tracker/index.php?func=detail&aid=988124&group_id=75…> Assignee: shammah <http://sourceforge.net/users/shammah/> Summary: perfomance: memory cleanup for pool takes too long Bug #: 995270 <http://sourceforge.net/tracker/index.php?func=detail&aid=995270&group_id=75…> Assignee: shammah <http://sourceforge.net/users/shammah/> Summary: boost::pool_allocator breaks with vector of vectors Bug #: 1179641 <http://sourceforge.net/tracker/index.php?func=detail&aid=1179641&group_id=7…> Assignee: speedsnail <http://sourceforge.net/users/speedsnail/> Summary: BCB6 throw EExternelException Bug #: 596149 <http://sourceforge.net/tracker/index.php?func=detail&aid=596149&group_id=75…> Assignee: speedsnail <http://sourceforge.net/users/speedsnail/> Summary: Exception safety in class \'thread\' Bug #: 1305885 <http://sourceforge.net/tracker/index.php?func=detail&aid=1305885&group_id=7…> Assignee: turkanis <http://sourceforge.net/users/turkanis/> Summary: rational operator&lt; can overflow Bug #: 798357 <http://sourceforge.net/tracker/index.php?func=detail&aid=798357&group_id=75…> Assignee: turkanis <http://sourceforge.net/users/turkanis/> Summary: problem with boost::iostreams when compiled with Visual C++ Bug #: 1365752 <http://sourceforge.net/tracker/index.php?func=detail&aid=1365752&group_id=7…> Assignee: urzuga <http://sourceforge.net/users/urzuga/> Summary: [boost::lambda] Compile error with libstdc++ debug mode Bug #: 1444052 <http://sourceforge.net/tracker/index.php?func=detail&aid=1444052&group_id=7…> Assignee: vladimir_prus <http://sourceforge.net/users/vladimir_prus/> Summary: multitoken broken in program_options 1.33 Bug #: 1266877 <http://sourceforge.net/tracker/index.php?func=detail&aid=1266877&group_id=7…> -- -- Marshall Marshall Clow Idio Software <mailto:marshall@idio.com> It is by caffeine alone I set my mind in motion. It is by the beans of Java that thoughts acquire speed, the hands acquire shaking, the shaking becomes a warning. It is by caffeine alone I set my mind in motion.

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Re: [boost] Infinite precision integer draft
by Sohail Somani 01 Jun '06

01 Jun '06

> -----Original Message----- > From: boost-bounces(a)lists.boost.org > [mailto:boost-bounces@lists.boost.org] On Behalf Of Bronek Kozicki > Sent: Wednesday, May 31, 2006 3:12 PM > To: boost(a)lists.boost.org > Subject: Re: [boost] Infinite precision integer draft > > Maarten Kronenburg wrote: > > For using mixed expressions with > > different types, run-time polymorphism > > is required. > > does the library need something that runtime-polymorphism > delivers and that > cannot be done with templates? Not that I'm such a big fan of > templates, but > they proved useful. Maybe not that much in domain-specific > applications, but > in interface part of many libraries they work pretty well > (Boost is good > example here). I'd also argue that they usually proved more > extensible than > libraries designed around OOP. Actually pretty useful in domain specific libraries (I guess applications applies too).

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