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retrieving boost::variant values to different types
by Andrew Chapman 17 Feb '04

17 Feb '04

Hey everyone, I was just having a look at the new boost::variant vlass, and I was expecting to be able to do something like: boost::variant<int, float> var; var = 5; int i = boost::get<int>(var); // fine float f = boost::get<float>(var); // throws As the comments show, asking for the variant's value using get<int> works fine but get<float> throws an exception as it is an unmatched type. So it seems that before you can retrieve the value of the variant you need to know its type? How do you check what type the variant is currently holding? This would work but is inefficient/ugly: boost::variant<int, float> var; var = 5; std::stringstream str; str << var; int i = atoi(str.str()); float f = atof(str.str()); I was hoping to use the variant class to implement scripting language style variables where you can get/set them to be any type (which seems to work fine) and also retrieve them to any type (though retrieving a string as a bool may not always make too much sense). Any suggestions? -- Andrew Chapman 3D Technical Director - Framestore CFC

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MPL: loop unrolling
by Martin Wartens 15 Feb '04

15 Feb '04

Hi, is there a way to unroll a loop with mpl? I simply would like to unroll for (int i=0; i<10; i++) foobar(i); MPL looks like it is quite powerful, but what is it worth when there is no useful documentation? There are hardly any examples, the mini-tutorial is indeed very mini. Then there is a listing of the interfaces and "the MPL paper", which is mainly concerned with design/implementation questions. Regards, Martin ________________________________________________________________________________________________ Sagen Sie nicht, wir hätten Sie nicht gewarnt! http://my-mail.ch/?redirect=9901 Bestellen Sie Ihren PC oder Ihr Notebook online und sparen Sie! http://my-mail.ch/?redirect=1530

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Building boost with dev-cpp
by mvogt＠juptech.com 15 Feb '04

15 Feb '04

Hi, can anyone help me with building boost using dev-cpp? I'm trying to build boost 1.31.0 with this system, never having used it before. I have Dev-Cpp installed at C:\Program Files\Dev-Cpp, and boost extracted to C:\Code\boost_1_31_0. Using the command line: C:\Code\boost_1_31_0> bjam "-sTOOLS=mingw" "-sMINGW_ROOT_DIRECTORY=c:/progra~1/dev-cpp" install bjam tries to start building various targets, and manages to invoke the compiler, but all compilations fail due to failing to find the standard include files - various manipulations of -sMINGW_INCLUDE_DIRECTORY haven't helped. This is the output of the first compile in the build: -------------------------------------------------------------- c:/progra~1/dev-cpp/bin/\g++ -c -Wall -ftemplate-depth-100 -DBOOST_DATE_TIME_POSIX_TIME_STD_CONFIG -DBOOST_ALL_DYN_LINK=1 -g -O0 -fno-inline -mno-cygwin -I"bin\boost\libs\date_time\build" -I "C:\Code\boost_1_31_0" -o "bin\boost\libs\date_time\build\boost_date_time.dll\mingw\debug\greg_month.obj" "C:/Code/boost_1_31_0/libs/date_time/build/../src/gregorian/greg_month.cpp" In file included from C:/Code/boost_1_31_0/boost/config.hpp:40, from C:/Code/boost_1_31_0/boost/shared_ptr.hpp:18, from C:/Code/boost_1_31_0/boost/date_time/gregorian/greg_month.hpp:14, from C:/Code/boost_1_31_0/libs/date_time/src/gregorian/greg_month.cpp:14: C:/Code/boost_1_31_0/boost/config/select_stdlib_config.hpp:20:19: utility: No such file or directory In file included from C:/Code/boost_1_31_0/boost/shared_ptr.hpp:27, from C:/Code/boost_1_31_0/boost/date_time/gregorian/greg_month.hpp:14, from C:/Code/boost_1_31_0/libs/date_time/src/gregorian/greg_month.cpp:14: C:/Code/boost_1_31_0/boost/detail/shared_count.hpp:35:61: memory: No such file or directory C:/Code/boost_1_31_0/boost/detail/shared_count.hpp:36:41: functional: No such file or directory C:/Code/boost_1_31_0/boost/detail/shared_count.hpp:37:46: exception: No such file or directory C:/Code/boost_1_31_0/boost/detail/shared_count.hpp:38:46: new: No such file or directory C:/Code/boost_1_31_0/boost/detail/shared_count.hpp:39:61: typeinfo: No such file or directory C:/Code/boost_1_31_0/boost/detail/shared_count.hpp:40:43: cstddef: No such file or directory [ snip ] C:/Code/boost_1_31_0/boost/detail/shared_count.hpp:389: confused by earlier errors, bailing out Executing through .bat file Executing command [cmd.exe] [/Q/C][C:\DOCUME~1\MJV1\LOCALS~1\Temp\jam5712-00.bat] ...failed gcc-C++-action bin\boost\libs\date_time\build\boost_date_time.dll\mingw\debug\greg_month.obj... gcc-C++-action bin\boost\libs\date_time\build\boost_date_time.dll\mingw\debug\greg_weekday.obj -------------------------------------------------------------- I would be happy to supply any output that might be useful in diagnosing my problem. Thanks, Matt ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify mail.administrator(a)jupiters.com.au **********************************************************************

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Regex linker problem with VC7.1
by Keith MacDonald 15 Feb '04

15 Feb '04

I built boost 1.31.0 using bjam "-sTOOLS=VC7.1", and the static library names that are generated for regex do not match those generated by its header files. For example, one actual library name is: libboost_regex-VC7.1-mt-gd-1_31.lib Whereas, because of the "#pragma comment(lib, ..." stuff, the linker expects: libboost_regex-vc71-mt-gd-1_31.lib There's no header macro to disable automatic linking, so renaming the library is the easiest workaround. Keith MacDonald

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Use of regex_grep in regex_replace
by Keith MacDonald 15 Feb '04

15 Feb '04

I need to know if regex_replace actually makes any replacements, so will have to code something similar myself, rather than using it as is. The 1.31.0 documentation states that regex_replace (effectively) constructs a regex_iterator object to do the work, but in practice it uses the deprecated regex_grep algorithm. Is there some advantage to doing it that way? Thanks, Keith MacDonald

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regex_replace not found
by Scott Field 15 Feb '04

15 Feb '04

I installed boost_1_31_0 on Red Hat Fedora Core 1 with no apparent errors. I can compile and run the examples in /usr/local/src/boost_1_31_0/libs/date_time/example and I have compiled and run some graph examples so I think it is installed OK. However when I compile /usr/local/src/boost_1_31_0/libs/regex/example/snippets/credit_card_example.cpp (or anything that uses regex_replace) I get the following error: [root@athlon snippets]# g++ credit_card_example.cpp credit_card_example.cpp: In function `std::string machine_readable_card_number(const std::string&)': credit_card_example.cpp:35: error: `regex_replace' undeclared in namespace ` boost' credit_card_example.cpp: In function `std::string human_readable_card_number(const std::string&)': credit_card_example.cpp:40: error: `regex_replace' undeclared in namespace ` boost' TIA Scott

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boost_1_31_0 VC7.1 Lib names incompatible with VS IDE???
by Jeff Flinn 14 Feb '04

14 Feb '04

Sorry if I'm missing something here but when I build boost with: bjam "-sTOOLS=VC7.1" "-sVC71_ROOT=C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7" I get libs and dll's generated with names like: libboost_signals-VC7.1-mt-gd-1_31.lib Entering the above into the VS-IDE Project-Properties Dialong - Linker-Input Additional-Dependencies Field and trying to Link yields: Linking... LINK : fatal error LNK1104: cannot open file 'libboost_signals-vc71-mt-gd-1_31.lib' Removing the '.' from VC7.1 in the IDE and renaming the file in like fashion allows the Link to succeed. Is there a way to generate the names in the first place without the offending '.'. Should the '7.1' be generated at all? The Toolset Abbreviation Table in getting_started.html list "vc" for both VC7 and VC7.1. Thanks, Jeff

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Iterator library docs
by Ded Panas 13 Feb '04

13 Feb '04

Subj looks fine, but which files to #include to use the library? dedpanas

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RE: [Boost-users] building boost on HP-UX
by Tom Matelich 13 Feb '04

13 Feb '04

I use boost on HP with g++. It works fairly well. I'm not sure what's going on with Toon. He took over the HP testing from Jens Maurer who was using an account Boost has been given into a server at HP. For a while, the aCC team was saying they were going to start using boost in their regression testing. I'm not sure why they haven't. I'd really like to see if they've improved at all, lately, but I don't have a recent version of aCC to use. > -----Original Message----- > From: Cheenu Srinivasan [mailto:cheenu_srinivasan@hotmail.com] > Sent: Friday, February 13, 2004 7:33 AM > To: boost-users(a)lists.boost.org > Subject: [Boost-users] building boost on HP-UX > > > I've been trying to locate information on how boost performs on HP-UX. > > The boost regression log runs with aCC are 7 months old: > http://boost.sourceforge.net/regression-logs > and the results (74% failure) are not encouraging. > > Has aCC been given up for dead by the boost community? Has anyone > tried other compilers? g++? comeau? Thanks. > > Cheenu > > _________________________________________________________________ > Check out the great features of the new MSN 9 Dial-up, with > the MSN Dial-up > Accelerator. http://click.atdmt.com/AVE/go/onm00200361ave/direct/01/ > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users > ----------------------------------------------------------------------- DISCLAIMER: Information contained in this message and/or attachment(s) may contain confidential information of Zetec, Inc. If you have received this transmission in error, please notify the sender by return email. -----------------------------------------------------------------------

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building boost on HP-UX
by Cheenu Srinivasan 13 Feb '04

13 Feb '04

I've been trying to locate information on how boost performs on HP-UX. The boost regression log runs with aCC are 7 months old: http://boost.sourceforge.net/regression-logs and the results (74% failure) are not encouraging. Has aCC been given up for dead by the boost community? Has anyone tried other compilers? g++? comeau? Thanks. Cheenu _________________________________________________________________ Check out the great features of the new MSN 9 Dial-up, with the MSN Dial-up Accelerator. http://click.atdmt.com/AVE/go/onm00200361ave/direct/01/

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