- Boost - lists.boost.org

Re: [boost] Exception lib?
by Sohail Somani 09 Jul '06

09 Jul '06

> -----Original Message----- > From: boost-bounces(a)lists.boost.org > [mailto:boost-bounces@lists.boost.org] On Behalf Of Emil Dotchevski > > Not to mention that the client can and will do it wrong. > > I don't want to make a huge deal out of this because > ultimately I don't mind > hiding the dynamic_cast in a function get_exception_info. But > I am arguing > that this abstraction is not necessary because the only > implementation > possible is through a dynamic_cast (at least I can't think of another > possibility). Well for some people the only way to fix a const correctness related error is to remove the const. I can imagine people doing all sorts of (wrong)casts. IMHO, I think the api should constrain that freedom seeing as there *is* only one right way to do it! Sohail

6 10

Interest in a clone_ptr class?
by Kevin Spinar 09 Jul '06

09 Jul '06

Is there interest in a clone_ptr class to supplement the current smart_ptr library? A clone_ptr is a smart pointer which performs a deep copy of the pointed-to object whenever the clone_ptr is copied. Also, the polymorphic type is maintained, eg: clone_ptr<Base> p(new Derived); clone_ptr<Base> p2; p2 = p; /* p and p2 now point to different Derived objects */ I am aware that there is a policy_ptr library being constructed which will probably provide the same functionality as this clone_ptr; however, when is this policy_ptr library scheduled to be completed? With cvs.sourceforge.netcurrently appearing to be down I've been unable to find accurate information on the status of this library, but with the complexity involved in creating such a versatile smart pointer, I imagine policy_ptr will still be under construction for some time; whereas a clone_ptr class could be written rather quickly, considering the simplicity of it and using the existing smart_ptr library as a guide. Kevin Spinar spinarkm [at] uwec [dot] edu

5 26

Fwd: [Boost-users] [format][patch][1.33.1][SunPro11] missing static_cast from void* to char*
by Marc Mutz 09 Jul '06

09 Jul '06

Hi, This patch is not in 1.34-rc1. What's the preferred way to submit those things? Thanks, Marc -- Marc Mutz -- marc(a)klaralvdalens-datakonsult.se, mutz(a)kde.org Klarälvdalens Datakonsult AB, Platform-independent software solutions

1 0

[variant/mpl] increase in BOOST_MPL_LIMIT_LIST_SIZE not affecting #types a variant can hold
by Marc Mutz 09 Jul '06

09 Jul '06

Hi, Test case and compiler output (gcc 4.0.x/Linux) attached. Would be nice if someone with karma could add this (or something similar) to the regression tests for variant. Thanks, Marc -- Marc Mutz -- marc(a)klaralvdalens-datakonsult.se, mutz(a)kde.org Klarälvdalens Datakonsult AB, Platform-independent software solutions

1 1

Exception lib?
by Emil Dotchevski 09 Jul '06

09 Jul '06

Hello, After the promising initial interest in the Exception lib I wrote, I ported the source code to Boost, and posted a link to the documentation. But so far there has not been even a single reply to my post :| I am not quite sure how to inerpret this... Is it "go ahead, we'll discuss the details during the formal review process"? Or is it complete lack of interest for adding such a library to Boost? I'm even more puzzled because my initial post did get a bunch of responses, without even having posted source code or documentation! Anyway... Here is the link to the documentation again: http://www.revergestudios.com/exception/exception.htm If you click "download", you'll get the source code, as well as an example and a test suite, complete with Boost Build jamfiles. Thanks, Emil

11 39

Thanks Bjam!
by Andy Little 08 Jul '06

08 Jul '06

Whenever I invoke bjam I get this first: warning: Python location is not configured warning: the Boost.Python library won't be built Building Boost.Regex with the optional Unicode/ICU support disabled. Please refer to the Boost.Regex documentation for more information (and if you don't know what ICU is then you probably don't need it). Thanks Bjam. You know what? I really don't care! ;-) regards Andy Little

13 26

building boost on i386 OSX
by Oliver Gräser 08 Jul '06

08 Jul '06

Hello, I'm trying to build boost on my Macbook, which runs OSX 10.4.7 on intel core duo with 2GB of ram. I downloaded boost_1_33_1.tar.gz, untared the file, ran configure, sudo make, sudo make install. Apparently, this installs some 1k + libraries, but not all - 6 libraries are not installed. If I re-run configure and make, it tries to update only these libs, but failes again. I attach the full output, however, the failure seems to originate from some undefined symbols (what ever a symbol is...) ld: Undefined symbols: __Z20init_unit_test_suiteiPPc /usr/bin/libtool: internal link edit command failed All these symbols are called whatsoeverPPc, so I think it might be caused by my intel CPU. Is there any workaround for this? I found the same problem posted on another mailing list, but with no replies so far. Can anyone help? Thanks a lot Oliver ---------------------terminal output----------------------------------------- ./tools/build/jam_src/bin.macosxx86/bjam -sPYTHON_ROOT=/System/ Library/Frameworks/Python.framework/Versions/2.3 -sPYTHON_VERSION=2.3 --prefix=/usr/local --exec-prefix=/usr/local --libdir=/usr/local/lib --includedir=/usr/local/include -sTOOLS=darwin install Building Boost.Regex with the optional Unicode/ICU support disabled. Please refer to the Boost.Regex documentation for more information (and if you don't know what ICU is then you probably don't need it). ...found 13486 targets... ...updating 12 targets... darwin-Link-DyLib-action bin/boost/libs/test/build/ libboost_prg_exec_monitor.dylib/darwin/debug/shared-linkable-true/ libboost_prg_exec_monitor-d-1_33_1.dylib ld: Undefined symbols: __Z8cpp_mainiPPc /usr/bin/libtool: internal link edit command failed DYLD_LIBRARY_PATH=bin/boost/libs/test/build/ libboost_prg_exec_monitor.dylib/darwin/debug/shared-linkable-true export DYLD_LIBRARY_PATH ld -dynamic -m -r -d -o "bin/boost/libs/test/build/ libboost_prg_exec_monitor.dylib/darwin/debug/shared-linkable-true/ libboost_prg_exec_monitor-d-1_33_1.lo" "bin/boost/libs/test/build/ libboost_prg_exec_monitor.dylib/darwin/debug/shared-linkable-true/ execution_monitor.o" "bin/boost/libs/test/build/ libboost_prg_exec_monitor.dylib/darwin/debug/shared-linkable-true/ cpp_main.o" \ && \ c++ -g -o "bin/boost/libs/test/build/ libboost_prg_exec_monitor.dylib/darwin/debug/shared-linkable-true/ libboost_prg_exec_monitor-d-1_33_1.dylib" "bin/boost/libs/test/build/ libboost_prg_exec_monitor.dylib/darwin/debug/shared-linkable-true/ libboost_prg_exec_monitor-d-1_33_1.lo" \ \ -dynamiclib -install_name "libboost_prg_exec_monitor- d-1_33_1.dylib" \ && \ rm -f "bin/boost/libs/test/build/libboost_prg_exec_monitor.dylib/ darwin/debug/shared-linkable-true/libboost_prg_exec_monitor-d-1_33_1.lo" ...failed darwin-Link-DyLib-action bin/boost/libs/test/build/ libboost_prg_exec_monitor.dylib/darwin/debug/shared-linkable-true/ libboost_prg_exec_monitor-d-1_33_1.dylib... ...skipped <@boost!lib>libboost_prg_exec_monitor-d-1_33_1.dylib for lack of <@boost!libs!test!build/libboost_prg_exec_monitor.dylib/ darwin/debug/shared-linkable-true>libboost_prg_exec_monitor- d-1_33_1.dylib... darwin-Link-DyLib-action bin/boost/libs/test/build/ libboost_prg_exec_monitor.dylib/darwin/release/shared-linkable-true/ libboost_prg_exec_monitor-1_33_1.dylib ld: Undefined symbols: __Z8cpp_mainiPPc /usr/bin/libtool: internal link edit command failed DYLD_LIBRARY_PATH=bin/boost/libs/test/build/ libboost_prg_exec_monitor.dylib/darwin/release/shared-linkable-true export DYLD_LIBRARY_PATH ld -dynamic -m -r -d -o "bin/boost/libs/test/build/ libboost_prg_exec_monitor.dylib/darwin/release/shared-linkable-true/ libboost_prg_exec_monitor-1_33_1.lo" "bin/boost/libs/test/build/ libboost_prg_exec_monitor.dylib/darwin/release/shared-linkable-true/ execution_monitor.o" "bin/boost/libs/test/build/ libboost_prg_exec_monitor.dylib/darwin/release/shared-linkable-true/ cpp_main.o" \ && \ c++ -Wl,-x -o "bin/boost/libs/test/build/ libboost_prg_exec_monitor.dylib/darwin/release/shared-linkable-true/ libboost_prg_exec_monitor-1_33_1.dylib" "bin/boost/libs/test/build/ libboost_prg_exec_monitor.dylib/darwin/release/shared-linkable-true/ libboost_prg_exec_monitor-1_33_1.lo" \ \ -dynamiclib -install_name "libboost_prg_exec_monitor-1_33_1.dylib" \ && \ rm -f "bin/boost/libs/test/build/libboost_prg_exec_monitor.dylib/ darwin/release/shared-linkable-true/libboost_prg_exec_monitor-1_33_1.lo" ...failed darwin-Link-DyLib-action bin/boost/libs/test/build/ libboost_prg_exec_monitor.dylib/darwin/release/shared-linkable-true/ libboost_prg_exec_monitor-1_33_1.dylib... ...skipped <@boost!lib>libboost_prg_exec_monitor-1_33_1.dylib for lack of <@boost!libs!test!build/libboost_prg_exec_monitor.dylib/ darwin/release/shared-linkable- true>libboost_prg_exec_monitor-1_33_1.dylib... darwin-Link-DyLib-action bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/debug/shared-linkable-true/ libboost_test_exec_monitor-d-1_33_1.dylib ld: Undefined symbols: __Z9test_mainiPPc /usr/bin/libtool: internal link edit command failed DYLD_LIBRARY_PATH=bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/debug/shared-linkable-true export DYLD_LIBRARY_PATH ld -dynamic -m -r -d -o "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/debug/shared-linkable-true/ libboost_test_exec_monitor-d-1_33_1.lo" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/debug/shared-linkable-true/ compiler_log_formatter.o" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/debug/shared-linkable-true/ execution_monitor.o" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/debug/shared-linkable-true/ framework.o" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/debug/shared-linkable-true/ plain_report_formatter.o" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/debug/shared-linkable-true/ progress_monitor.o" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/debug/shared-linkable-true/ results_collector.o" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/debug/shared-linkable-true/ results_reporter.o" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/debug/shared-linkable-true/ test_main.o" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/debug/shared-linkable-true/ test_tools.o" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/debug/shared-linkable-true/ unit_test_log.o" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/debug/shared-linkable-true/ unit_test_main.o" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/debug/shared-linkable-true/ unit_test_monitor.o" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/debug/shared-linkable-true/ unit_test_parameters.o" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/debug/shared-linkable-true/ unit_test_suite.o" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/debug/shared-linkable-true/ xml_log_formatter.o" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/debug/shared-linkable-true/ xml_report_formatter.o" \ && \ c++ -g -o "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/debug/shared-linkable-true/ libboost_test_exec_monitor-d-1_33_1.dylib" "bin/boost/libs/test/ build/libboost_test_exec_monitor.dylib/darwin/debug/shared-linkable- true/libboost_test_exec_monitor-d-1_33_1.lo" \ \ -dynamiclib -install_name "libboost_test_exec_monitor- d-1_33_1.dylib" \ && \ rm -f "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/debug/shared-linkable-true/ libboost_test_exec_monitor-d-1_33_1.lo" ...failed darwin-Link-DyLib-action bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/debug/shared-linkable-true/ libboost_test_exec_monitor-d-1_33_1.dylib... ...skipped <@boost!lib>libboost_test_exec_monitor-d-1_33_1.dylib for lack of <@boost!libs!test!build/libboost_test_exec_monitor.dylib/ darwin/debug/shared-linkable-true>libboost_test_exec_monitor- d-1_33_1.dylib... darwin-Link-DyLib-action bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/release/shared-linkable-true/ libboost_test_exec_monitor-1_33_1.dylib ld: Undefined symbols: __Z9test_mainiPPc /usr/bin/libtool: internal link edit command failed DYLD_LIBRARY_PATH=bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/release/shared-linkable-true export DYLD_LIBRARY_PATH ld -dynamic -m -r -d -o "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/release/shared-linkable-true/ libboost_test_exec_monitor-1_33_1.lo" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/release/shared-linkable-true/ compiler_log_formatter.o" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/release/shared-linkable-true/ execution_monitor.o" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/release/shared-linkable-true/ framework.o" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/release/shared-linkable-true/ plain_report_formatter.o" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/release/shared-linkable-true/ progress_monitor.o" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/release/shared-linkable-true/ results_collector.o" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/release/shared-linkable-true/ results_reporter.o" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/release/shared-linkable-true/ test_main.o" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/release/shared-linkable-true/ test_tools.o" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/release/shared-linkable-true/ unit_test_log.o" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/release/shared-linkable-true/ unit_test_main.o" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/release/shared-linkable-true/ unit_test_monitor.o" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/release/shared-linkable-true/ unit_test_parameters.o" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/release/shared-linkable-true/ unit_test_suite.o" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/release/shared-linkable-true/ xml_log_formatter.o" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/release/shared-linkable-true/ xml_report_formatter.o" \ && \ c++ -Wl,-x -o "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/release/shared-linkable-true/ libboost_test_exec_monitor-1_33_1.dylib" "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/release/shared-linkable-true/ libboost_test_exec_monitor-1_33_1.lo" \ \ -dynamiclib -install_name "libboost_test_exec_monitor-1_33_1.dylib" \ && \ rm -f "bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/release/shared-linkable-true/ libboost_test_exec_monitor-1_33_1.lo" ...failed darwin-Link-DyLib-action bin/boost/libs/test/build/ libboost_test_exec_monitor.dylib/darwin/release/shared-linkable-true/ libboost_test_exec_monitor-1_33_1.dylib... ...skipped <@boost!lib>libboost_test_exec_monitor-1_33_1.dylib for lack of <@boost!libs!test!build/libboost_test_exec_monitor.dylib/ darwin/release/shared-linkable- true>libboost_test_exec_monitor-1_33_1.dylib... darwin-Link-DyLib-action bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/debug/shared-linkable-true/ libboost_unit_test_framework-d-1_33_1.dylib ld: Undefined symbols: __Z20init_unit_test_suiteiPPc /usr/bin/libtool: internal link edit command failed DYLD_LIBRARY_PATH=bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/debug/shared-linkable-true export DYLD_LIBRARY_PATH ld -dynamic -m -r -d -o "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/debug/shared-linkable-true/ libboost_unit_test_framework-d-1_33_1.lo" "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/debug/shared-linkable-true/ compiler_log_formatter.o" "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/debug/shared-linkable-true/ execution_monitor.o" "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/debug/shared-linkable-true/ framework.o" "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/debug/shared-linkable-true/ plain_report_formatter.o" "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/debug/shared-linkable-true/ progress_monitor.o" "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/debug/shared-linkable-true/ results_collector.o" "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/debug/shared-linkable-true/ results_reporter.o" "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/debug/shared-linkable-true/ test_tools.o" "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/debug/shared-linkable-true/ unit_test_log.o" "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/debug/shared-linkable-true/ unit_test_main.o" "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/debug/shared-linkable-true/ unit_test_monitor.o" "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/debug/shared-linkable-true/ unit_test_parameters.o" "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/debug/shared-linkable-true/ unit_test_suite.o" "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/debug/shared-linkable-true/ xml_log_formatter.o" "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/debug/shared-linkable-true/ xml_report_formatter.o" \ && \ c++ -g -o "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/debug/shared-linkable-true/ libboost_unit_test_framework-d-1_33_1.dylib" "bin/boost/libs/test/ build/libboost_unit_test_framework.dylib/darwin/debug/shared-linkable- true/libboost_unit_test_framework-d-1_33_1.lo" \ \ -dynamiclib -install_name "libboost_unit_test_framework- d-1_33_1.dylib" \ && \ rm -f "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/debug/shared-linkable-true/ libboost_unit_test_framework-d-1_33_1.lo" ...failed darwin-Link-DyLib-action bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/debug/shared-linkable-true/ libboost_unit_test_framework-d-1_33_1.dylib... ...skipped <@boost!lib>libboost_unit_test_framework-d-1_33_1.dylib for lack of <@boost!libs!test!build/ libboost_unit_test_framework.dylib/darwin/debug/shared-linkable- true>libboost_unit_test_framework-d-1_33_1.dylib... darwin-Link-DyLib-action bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/release/shared-linkable- true/libboost_unit_test_framework-1_33_1.dylib ld: Undefined symbols: __Z20init_unit_test_suiteiPPc /usr/bin/libtool: internal link edit command failed DYLD_LIBRARY_PATH=bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/release/shared-linkable-true export DYLD_LIBRARY_PATH ld -dynamic -m -r -d -o "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/release/shared-linkable- true/libboost_unit_test_framework-1_33_1.lo" "bin/boost/libs/test/ build/libboost_unit_test_framework.dylib/darwin/release/shared- linkable-true/compiler_log_formatter.o" "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/release/shared-linkable- true/execution_monitor.o" "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/release/shared-linkable- true/framework.o" "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/release/shared-linkable- true/plain_report_formatter.o" "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/release/shared-linkable- true/progress_monitor.o" "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/release/shared-linkable- true/results_collector.o" "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/release/shared-linkable- true/results_reporter.o" "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/release/shared-linkable- true/test_tools.o" "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/release/shared-linkable- true/unit_test_log.o" "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/release/shared-linkable- true/unit_test_main.o" "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/release/shared-linkable- true/unit_test_monitor.o" "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/release/shared-linkable- true/unit_test_parameters.o" "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/release/shared-linkable- true/unit_test_suite.o" "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/release/shared-linkable- true/xml_log_formatter.o" "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/release/shared-linkable- true/xml_report_formatter.o" \ && \ c++ -Wl,-x -o "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/release/shared-linkable- true/libboost_unit_test_framework-1_33_1.dylib" "bin/boost/libs/test/ build/libboost_unit_test_framework.dylib/darwin/release/shared- linkable-true/libboost_unit_test_framework-1_33_1.lo" \ \ -dynamiclib -install_name "libboost_unit_test_framework-1_33_1.dylib" \ && \ rm -f "bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/release/shared-linkable- true/libboost_unit_test_framework-1_33_1.lo" ...failed darwin-Link-DyLib-action bin/boost/libs/test/build/ libboost_unit_test_framework.dylib/darwin/release/shared-linkable- true/libboost_unit_test_framework-1_33_1.dylib... ...skipped <@boost!lib>libboost_unit_test_framework-1_33_1.dylib for lack of <@boost!libs!test!build/libboost_unit_test_framework.dylib/ darwin/release/shared-linkable- true>libboost_unit_test_framework-1_33_1.dylib... ...failed updating 6 targets... ...skipped 6 targets... Not all Boost libraries built properly. Oliver Gräser Physics Department, University of Konstanz Soft Condensed Matter Theory Group Universitätsstrasse 10 / M671 D-78457 Konstanz phone: +49 7531 882550 mailto:oliver.graeser@uni-konstanz.de

2 4

Convert function pointer type to function type
by Peter Soetens 08 Jul '06

08 Jul '06

Hi, I'm desperately seeking for doing this conversion using the boost libraries. User code often provides a function pointer, while library code often works with function types. For example (function_conversion does the 'magic' here): int foo(int); template<class T, class R = typename function_conversion<T>::type > boost::function<R> function_wrapper(T t) { return boost::function<R>(t); } Such that the user can write: function_wrapper( &foo )(1); Thus no longer needs to specify the int(int) function type to boost::function. Is it possible to construct such a 'function_conversion' type ? Any answer is greatly appreciated, Peter -- Peter Soetens -- FMTC -- <http://www.fmtc.be>

4 6

Shmem shared_ptr issue with gcc 3.3.x
by Ryan, Paul L. 07 Jul '06

07 Jul '06

Ion and boost list, I've been working with the shmem version of shared_ptrs and have come accross and interesting issue. When using the library on a 3.4.x gcc compiler I have on issues however when compiling with a gcc 3.3.x compiler the #error Unrecongnized threading platform gets thrown from /boost/shmem/smart_ptr/sp_counted_base.hpp. It also apears that this compilation is successful when using standard boost shared_ptrs instead of the ones included with boost. Any assitance with this issue would be greatly appreciated. Paul Ryan SAIC - Tactical Systems

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Comments on Value Semantics vs. OOP et. al.
by Sean Parent 07 Jul '06

07 Jul '06

A couple of passing comments (okay - it turned into a lecture, I've been doing to much public speaking lately...) Generic programming is the processes of defining algorithms in terms of semantic requirements on types and operations with the goal of achieving maximum efficiency _and_ the highest level of abstraction. I have a presentation with the following table relating generic programming to abstract algebra. Generic Programming Mathematics ____________________________________________________ Semantic Requirement Axiom Concept Algebraic Structure Model (types and operations) Model Algorithms Theorems Regular Function Function Refined Concept - a Concept defined by adding requirements to an existing concept. monoid: semigroup with an identity element BidirectionalIterator: ForwardIterator with constant complexity decrement Refined Algorithm - an algorithm performing the same function as another but with lower complexity or space requirements given a refined concept. One of my favorite quotes from Alex is "Software is defined on algebraic structures." We don't make the semantic requirements up - we discover them in the algorithms we write on the machine model we're given. I like to bash on OOPs as much as the next Generic guy - but the fact is that the same Concepts _must_ be reflected in OOP or the algorithms _can't_ work. Generic programming is as much about understanding how software works as how to write software. The most common point of contention I hear is that the current practice of Generic programming ignores "move" as a semantic requirement (we speak in terms of assignment which is often too strong) where as OOP (as currently practiced with heavy use of heap allocated objects) gets "move" for free (as a side effect of an implementation detail to get polymorphism) - hence OOP programmers don't see the strong need for copy and assignment. Nearly all of the STL algorithms could be recast in terms of move and would be more efficient. We can do a pretty good job of an efficient move with swap() - but _really_ swap should be defined in terms of move instead of being a primitive. An interesting point is that move() is much more necessary with the current style of OOP because of the need to use factory functions instead of constructors for object creation - so us Generic guys would rather just create the object in place. The requirement of polymorphism comes from the desire to perform algorithms on heterogeneous collections (different types modeling the same Concept(s)). Since a model is a collection of types and operations, imposing the requirement of polymorphism through inheritance on closed classes is unnecessarily intrusive and limiting. Inheritance becomes a significant barrier to code reuse. The need for heap allocations stems from the fact that heterogeneous types will be of different sizes - dealing with these pointers (and the significant ensuing issues) is purely a side effect of that implementation detail. Non-mutable values have the advantage that pointers to a non-mutable value have the same semantics (practically) as just a const value (hence FP languages have value semantics even though they're typically implemented with references). The difference with pointers only appear with multiple write access; which in practice is relatively rare, even by accident in systems with rampant use of ref counted pointers. Trying to eliminate all mutating operations is foolhardy. That's not just my opinion, John Backus told me he always knew that mutating operations were necessary, he just didn't know how to deal with them systematically - he is impressed by Alex's work in this area. The difference between having operator=() mean "move" and operator=() mean "assign" is purely one of syntax - not semantics. It is desirable to settle on a single syntax for the Regular operations (copy, assign, move, equality comparison) and that implies the use of copy_ctor, operator=(), swap (until we have a good move), and operator==() for consistency with built in types (including the pointers used to refer to the OOPs objects). It is more important to define algorithms in terms of concepts then to debate the syntactic issues. Algorithms are our theorems. Seek to _understand_ what is going on with OOPs instead of simply slamming it. The fact is, programming with runtime polymorphism using the current Generic programming style is cumbersome and often requires significant language abuse to achieve the same results that can be had with simple inheritance. Of course, thanks to Boost much of that abuse comes pre-packaged and ready to use. -- Sean Parent Sr. Engineering Manager Adobe Software Technology Lab sparent(a)adobe.com

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