- Boost-users - lists.preview.boost.org

(newbie) design question (is there an MPL solution?)
by Timothy Perrigo 11 Aug '04

11 Aug '04

I'm just now treading into the (rather intimidating) waters of template metaprogramming, so I'm not even sure if it will fit what I'm trying to accomplish. I need to create a kind of registry to keep track of instances of variables of different types (actually, several of these registries, representing different system states); variables of a type would be identified by an unique (integer) id. In other words, the variables within a particular registry represent the state of the system at a given point in time, so although each registry would have variables of the same types and ids, the values of the variables in different registries may be different. If the variables were all of the same type, a simple map would work. What I would like is a way of asking this registry for a variable of a specified type and id, and get back the appropriate instance (of the appropriate type). I.e., something like the following would be ideal: MyType mt = registry.get<MyType>(my_id); Is there anything in the MPL (or elsewhere in Boost) that might help me accomplish what I'm looking to do? If not, does anyone have any design suggestions to accomplish this in another way? Any help would be appreciated! Thanks, Tim

4 7

Newbie questions and possible bug reports
by Daniel Huber 11 Aug '04

11 Aug '04

Hi, I am a new user to Boost, and I am trying to compile and install Boost for the first time. In the process, I have run into some problems that the Boost maintainers may be interested in. First, I was wondering if there is a specification as to which version of gcc the Boost libraries are known to compile with. In particular, I have a lot of code that only compiles under 2.95.3, and I get a lot of error messages when compiling. Here's an example: /usr/bin/objcopy --set-section-flags .debug_str=contents,debug "bin/boost/libs/test/build/libboost_test_exec_monitor.so/gcc/debug/shared-linkable-true/test_tools.o" ...failed gcc-C++-action bin/boost/libs/test/build/libboost_test_exec_monitor.so/gcc/debug/shared-linkable-true/test_tools.o... If it turns out that Boost is supposed to work with this version of gcc, I can provide more detailed results. I think that due to the failures, the libraries and include files were not installed by the bjam command. Second, I noticed that the zip version of the latest release 1_31_0 contains files that are in windows format (ie, the files contain carriage returns). I'm not sure whether this is intended, since most people who download the zip extension will use it on windows. However, if you try to install from a unix variant, you get very strange errors. Specifically, when running "sh build.sh" in the tools/build/jam_src dir, the program dies with: : command not found : command not found : command not found 'uild.sh: line 13: syntax error near unexpected token `() 'uild.sh: line 13: `echo_run () I don't know whether there are files with this problem outside the tools/build/jam_src directory. Finally, the link to the "boost public CVS repository" on the bug report instructions page (http://www.boost.org/more/bugs.htm) is broken. Sincerely, Daniel Huber

3 2

Thanks - problem solved
by Daniel Huber 10 Aug '04

10 Aug '04

FYI, this did the trick. Thanks for your help. -Daniel boost-users-request(a)lists.boost.org wrote: >Here is what I did to install: >> >> First go to tools/build/jam_src and build jam: >> sh build.sh >> >> Then cd back to the boost root dir, and install: >> tools/build/jam_src/bin.linuxx86/bjam --sTOOLS=gcc >> --prefix=~/local/linux install Two things: a) It should be -sTOOLS=gcc but since the default is gcc on Linux anyway this doesn't really affect the results. b) "~/local/linux" is a shell construct which will only gets expanded by the shell if it's by itself as an argument. You heed to use $HOME/local/linux instead.

1 0

Problem compiling boost under gcc
by Daniel Huber 10 Aug '04

10 Aug '04

Hi, This is a followup to my previous message. I must be doing something wrong, but I am unable to compile boost under gcc 3.2.2 on a Red Hat Linux machine (RH9 linux 2.4.24). Note, I also tried gcc 2.95.3 with the same results. If anyone has the time or the desire to help me out, it would be much appreciated. Here is what I did to install: First go to tools/build/jam_src and build jam: sh build.sh Then cd back to the boost root dir, and install: tools/build/jam_src/bin.linuxx86/bjam --sTOOLS=gcc --prefix=~/local/linux install I get a lot of errors relating to the HardLink command. (I am wondering if the problem might be caused by the bjam program.) I checked the things I thought might be causing problems: The target directory does exist, but the files are not getting copied into that directory (eg. by the FileClone command). I have write permissions in the target directory. I am attaching the output from the compile process. Sincerely, Daniel Huber

2 1

bjam options
by Samuel 09 Aug '04

09 Aug '04

I agree with the "nuclear engineer" that the "Getting Started" instructions are a little confusing, but I think it is at least as good as (for example) the instructions for MySQL. There are a few things that are not clear, and I will post separate messages for most of them. One little detail is that the the "Getting Started" instructions use double quotes in the examples of the bjam options, yet as best as I can determine, the double quotes don't work. In other words, the following does not work: bjam "--help" And the following works: bjam --help It is true that there is an example showing the version that works, but I missed seeing it until I began writing this message and the other examples are confusing to the extent that they make it seem as if the double quotes are needed. So in other words, I don't understand why the double quotes are shown in the sample uses of bjam.

2 7

My Boost got built
by Samuel 08 Aug '04

08 Aug '04

Is there a description of what additional files need to be copied? I used the following to build Boost for Visual C++ with Windows XP: Call "S:\Program Files\Microsoft Visual Studio\VC98\Bin\VCVARS32.BAT" Set MSVC_ROOT=S:\Program Files\Microsoft Visual Studio\VC98 "S:\Software\Boost\boost-jam-3.1.10-1-ntx86\bjam" -sTOOLS=msvc --prefix="S:\ Software\Boost" --builddir="T:\boost_1_31_0\BuildDir" install Pause That seems to have worked. Except I did see some messages saying some stuff were not found. That is not relevant to this question, though. I copied the sample in the Variant documentation to get the directories set properly and ensure that that much (Variant) works. So now (I assume) I don't need to use most of the files (in the "T:" partition) that I used to build and "install" Boost from. However I see there are some documentation files in the "install from" files that are not in my installed files, so I assume I should copy the documentation files. I realize that the files are also online but I will use the local copy that is provided. Is there something somewhere specifying what else should be saved from the "install from" files? I intend to make the "T:" partition unavailable normally but I can keep it so that I can get to it when I need to, but it would help to know what I need to copy first. If this is not described anywhere, then I just want to say that it would help. Until then, I assume I can figure it out.

1 0

install | stage
by Samuel 08 Aug '04

08 Aug '04

The definition of the terms "install" and "stage" is obviously clear to those that know what they mean, but it is not clear to me how they relate to Boost. I have worked with software for more than a quarter of a century, and I have even developed a couple of software promotion packagers, so I do have a basic understanding of the terms "install" and "stage". As best as I can guess, an "install" would be a combination of a "stage" and something else. So I assume I can do an install, but I might be wrong. So I think it would help to define those terms a bit more for the "Getting Started" page, for the benefit of all. For me, I have a Windows system and I have downloaded: http://aleron.dl.sourceforge.net/sourceforge/boost/boost_1_31_0.zip I have unzipped that to a temporary location. It is not clear to me if that will work. I am not sure if I can do an "install" and have everything I need put in the location I specify for using Boost. If that is explained somewhere then I apologize for missing it, but I think it is not made very clear.

1 0

Boost Installation Help needed
by Aaronburro＠netscape.net 07 Aug '04

07 Aug '04

Howdy, Sorry if this gets posted twice. i tried the webpage over at news.gmane.org, but it doesn't look like it got posted, so I subscribed(yay). Anyway, I'm trying to install Boost on Windows with the DJGPP compiler for c++. I've basically done nothing but get one big headache trying to follow the instructions at boost.org. So far, I have bjam in my windows\system32 directory. I tried to set it up to use DJGPP, a variant of gcc, but it doesn't seem to like my request. bjam keeps trying to use g++ instead of gpp, even though I gave it the GXX=gpp option. It also can't seem to find the directory of DJGPP, even though I used the GCC_ROOT_DIRECTORY=C:\DGJPP\ option as well. I am thoroughly stumped, and the documents over at boost.org seem to have been written by monkeys, albeit ones with good spelling and grammar. I am fairly computer literate, but those things are like rocket science to me(and I'm a nuclear engineer ;)) I'd use Boost.Build's .bat file, but I can't get bjam to work right, and then God only knows what I'll do from there, so I'd greatly appreciate a more "step-by-step" approach which is geared towards a WindowsXP user. Bryan Burroughs __________________________________________________________________ Switch to Netscape Internet Service. As low as $9.95 a month -- Sign up today at http://isp.netscape.com/register Netscape. Just the Net You Need. New! Netscape Toolbar for Internet Explorer Search from anywhere on the Web and block those annoying pop-ups. Download now at http://channels.netscape.com/ns/search/install.jsp

3 2

mpl related question
by Istvan Buki 06 Aug '04

06 Aug '04

Hello mpl experts, I'm trying to initialize the elements of an array using rules defined in a list of structures. The code below illustrate what I'm trying to achieve. The problem I have with this code is that the First_Descriptor structure contain this index member that will be used to access the right item of the array. This is not nice because it force the writer of this structure to deal with implementation details. Is there a way to get rid of this index typedef in the *_Descriptor structures by using another construct from the mpl that would generate it ? // The array I need to initialize. Array_Item array[2]; struct Initializer { template < typename U > void operator()( mpl::identity< U > ) { // This is where array elements are initialized. // Note how the index member is used. array[U::index::type::value].some_method( U::a_param ) ; } } ; // This is one structure containing rules used to initialize array items. struct First_Descriptor { enum { a_param = 123456 } ; typedef mpl::int_< 0 > index ; } ; struct Second_Descriptor { enum { a_param = 2567 } ; typedef mpl::int_< 1 > index ; } ; // The list of structures containg rules to be applied during array // initialization. typedef mpl::list< First_Descriptor, Second_Descriptor > Descriptors ; // traverse the list and apply the rules. mpl::for_each< Descriptors, mpl::make_identity<_> >( Initializer( ) ) ; Thanks for any help you could provide. Istvan

6 9

Error compiling REGEX under vc7.1 + stlport
by rflaperuta＠brq.com 06 Aug '04

06 Aug '04

People, this is one of the errors I got when compiling boost regex with vc7.1 + stlport: vc-Link bin\boost\libs\regex\build\boost_regex.dll\vc7.1-stlport\release\boost_regex-vc71-mt-p-1_31.dll bin\boost\libs\regex\build\boost_regex.dll\vc7.1-stlport\release\boost_regex-vc71-mt-p-1_31.lib Creating library bin\boost\libs\regex\build\boost_regex.dll\vc7.1-stlport\release\boost_regex-vc71-mt-p-1_31.lib and object bin\boost\libs\regex\build\boost_regex.dll\vc7.1-stlport\release\boost_regex-vc71-mt-p-1_31.exp winstances.obj : error LNK2001: unresolved external symbol "private: unsigned int __fastcall boost::cpp_regex_traits<wchar_t>::do_syntax_type(unsigned int)const " (?do_syntax_type@?$cpp_regex_traits@_W@boost@@ABIII@Z) regex.obj : error LNK2001: unresolved external symbol "private: unsigned int __fastcall boost::cpp_regex_traits<wchar_t>::do_syntax_type(unsigned int)const " (?do_syntax_type@?$cpp_regex_traits@_W@boost@@ABIII@Z) w32_regex_traits.obj : error LNK2001: unresolved external symbol "private: unsigned int __fastcall boost::cpp_regex_traits<wchar_t>::do_syntax_type(unsigned int)const " (?do_syntax_type@?$cpp_regex_traits@_W@boost@@ABIII@Z) wide_posix_api.obj : error LNK2001: unresolved external symbol "private: unsigned int __fastcall boost::cpp_regex_traits<wchar_t>::do_syntax_type(unsigned int)const " (?do_syntax_type@?$cpp_regex_traits@_W@boost@@ABIII@Z) instances.obj : error LNK2001: unresolved external symbol "private: unsigned int __fastcall boost::cpp_regex_traits<wchar_t>::do_syntax_type(unsigned int)const " (?do_syntax_type@?$cpp_regex_traits@_W@boost@@ABIII@Z) c_regex_traits.obj : error LNK2019: unresolved external symbol "private: unsigned int __fastcall boost::cpp_regex_traits<wchar_t>::do_syntax_type(unsigned int)const " (?do_syntax_type@?$cpp_regex_traits@_W@boost@@ABIII@Z) referenced in function "public: unsigned int __fastcall boost::cpp_regex_traits<wchar_t>::syntax_type(unsigned int)const " (?syntax_type@?$cpp_regex_traits@_W@boost@@QBIII@Z) c_regex_traits_common.obj : error LNK2001: unresolved external symbol "private: unsigned int __fastcall boost::cpp_regex_traits<wchar_t>::do_syntax_type(unsigned int)const " (?do_syntax_type@?$cpp_regex_traits@_W@boost@@ABIII@Z) cregex.obj : error LNK2001: unresolved external symbol "private: unsigned int __fastcall boost::cpp_regex_traits<wchar_t>::do_syntax_type(unsigned int)const " (?do_syntax_type@?$cpp_regex_traits@_W@boost@@ABIII@Z) posix_api.obj : error LNK2001: unresolved external symbol "private: unsigned int __fastcall boost::cpp_regex_traits<wchar_t>::do_syntax_type(unsigned int)const " (?do_syntax_type@?$cpp_regex_traits@_W@boost@@ABIII@Z) bin\boost\libs\regex\build\boost_regex.dll\vc7.1-stlport\release\boost_regex-vc71-mt-p-1_31.dll : fatal error LNK1120: 1 unresolved externals The odd thing is that when i compile boost withou stlport included it does not generate this erros, but it would be perfect to have stlport+boost Any ideas? Thanks in advance, Rodrigo

3 13