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RE: [Boost-Users] Re: Running the Boost_1_29_0 regression tests
by Beman Dawes 15 Oct '02

15 Oct '02

At 12:02 PM 10/15/2002, Arjun Bijanki wrote: >"David Abrahams" writes: > >> "Arjun Bijanki" <arjunb(a)microsoft.com> writes: > >> > Hi, I'm having trouble running the Boost_1_29_0 regression tests. A >lot >> > >> >> Arjun, >> >> What are you doing to compile/link the tests? >> The supported method uses bjam. Have you tried that? >> If you use the -d+2 option you can look at the command-lines used and >> replicate them in whatever environment you like. >> >> -Dave > >Thanks. Previously, I was using /status/regression.cpp to generate the >status table; I'll try using bjam instead. We probably should have removed regression.cpp from the 1.29.0 release. The thought occurred to me, but that was before we decided to include all the new regression test components in the current CVS main trunk. Now that the main trunk has everything needed for the new tests, there is no reason to keep regression.cpp around. I'll remove it. --Beman

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RE: [Boost-Users] Re: Running the Boost_1_29_0 regression tests
by Arjun Bijanki 15 Oct '02

15 Oct '02

"David Abrahams" writes: > "Arjun Bijanki" <arjunb(a)microsoft.com> writes: > > Hi, I'm having trouble running the Boost_1_29_0 regression tests. A lot > > > > Arjun, > > What are you doing to compile/link the tests? > The supported method uses bjam. Have you tried that? > If you use the -d+2 option you can look at the command-lines used and > replicate them in whatever environment you like. > > -Dave Thanks. Previously, I was using /status/regression.cpp to generate the status table; I'll try using bjam instead. Arjun

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RE: [Boost-Users] Re: Type traits direct compiler support
by scleary＠jerviswebb.com 15 Oct '02

15 Oct '02

> -----Original Message----- > From: Edward Diener [mailto:eddielee@tropicsoft.com] > > > > From: Edward Diener [mailto:eddielee@tropicsoft.com] > > > > > > What does it mean in the type_traits documentation that "direct compiler > > > support for that traits class is required" ? I do not see that terminology > > > explained anywhere and am lost as far as to what it refers. > > > > It means that there is no known way to implement that class (in a > > Standard-compliant, portable manner). > > > > The type traits library is in a rather uncomfortable position, since it is > > essentially trying to add reflection to the C++ language after the fact. > > > > As currently implemented, the type traits library bends over backwards to > > try to provide as much as possible to as many different compilers as > > possible. But the simple fact is that it should not really be a library, > > but a part of the supplied language. > > > > Some type traits classes technically require compiler support. However, > > those classes will all try to take their "best guess" at the correct answer > > -- sometimes defaulting to a "safe" default if they can't figure out the > > correct answer. > > What sort of compiler support is being talked of here, since you mention > that it can't be done in a standard-compliant manner ? Does this mean > looking at preprocessor defines to determine the correct results, or what ? > It is the vagueness of the term "compiler support", which you did not > alleviate in your answer, which I am trying to clarify. "Compiler support" means "anything the compiler can give us so that we can implement that class correctly". It could be a specially-recognized preprocessor define, a quasi-class (e.g., SGI's type traits), a pragma, a keyword, or anything else that the compiler provides. -Steve

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Returning a tokenizer by value
by Brian_X7 15 Oct '02

15 Oct '02

Is there a problem with returning a tokenizer from a function? Here's what I've got: typedef boost::tokenizer< boost::char_separator<char> > tokenizer; tokenizer getTokens( istream& is ) { boost::char_separator<char> sep(",","", boost::keep_empty_tokens); std::string str; getline(is,str,'\n'); tokenizer toks( str, sep ); return toks; } .. tokenizer tokens = getTokens(input); tokenizer::iterator it = tokens.begin(); (*it) now contains garbage, interesting enough, iterating through the rest of the container works. when I move the processing of getTokens into the main code body the first token (*it) is then correct. Am I missing something fundamental here?

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RE: [Boost-Users] Type traits direct compiler support
by scleary＠jerviswebb.com 15 Oct '02

15 Oct '02

> -----Original Message----- > From: Edward Diener [mailto:eddielee@tropicsoft.com] > > What does it mean in the type_traits documentation that "direct compiler > support for that traits class is required" ? I do not see that terminology > explained anywhere and am lost as far as to what it refers. It means that there is no known way to implement that class (in a Standard-compliant, portable manner). The type traits library is in a rather uncomfortable position, since it is essentially trying to add reflection to the C++ language after the fact. As currently implemented, the type traits library bends over backwards to try to provide as much as possible to as many different compilers as possible. But the simple fact is that it should not really be a library, but a part of the supplied language. Some type traits classes technically require compiler support. However, those classes will all try to take their "best guess" at the correct answer -- sometimes defaulting to a "safe" default if they can't figure out the correct answer. -Steve

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[ANN] Quaternions, Octonions and Special Functions: please download from CVS.
by Hubert HOLIN 15 Oct '02

15 Oct '02

Somewhere in the E.U., le 15/10/2002 Bonjour Please note that due to some unfortunate circumstances beyond our control, the quaternion, octonion and special functions libraries which shipped with Boost 1.29.0 were not in the state they were meant to be in. You might want to download new versions of these libraries from the CVS in a couple of days. The version which should be present there adds compatibility with M$VCPP 7, and fixes things which CWPro 8 has broken in some circumstances. In a few days there will be another version with a user-contributed fix for gcc2.95.x and stlport on linux, among other things. Merci Hubert Holin Hubert.Holin(a)Bigfoot.com

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Running the Boost_1_29_0 regression tests
by Arjun Bijanki 14 Oct '02

14 Oct '02

Hi, I'm having trouble running the Boost_1_29_0 regression tests. A lot of tests don't appear to have main() defined. As an example, one of the tests fails with the following: *** libs/utility/ref_test.cpp *** ** Microsoft Visual C++ cl /Feboosttmp.exe /Zc:wchar_t /nologo /Zm400 /MDd /W3 /GR /GX /Zi /Od /GZ /I".." /D "WIN32" /D "_DEBUG" /D "_MBCS" /_CONSOLE" ../libs/utility/ref_test.cpp /link /incremental:no user32.lib ref_test.cpp LINK : fatal error LNK1561: entry point must be defined 0.80 s Return code: 2 Fail libs/utility/ref_test.cpp has the following lines: #define BOOST_INCLUDE_MAIN #include <boost/test/test_tools.hpp> But this doesn't seem to define a main() function like it did in Boost_1_28_0. Do I need to do some different kind of installation for Boost_1_29_0, or did I pick up wrong headers, or is this function missing? I downloaded Boost_1_29_0 from: http://boost.sourceforge.net/release/boost_1_29_0.zip Thanks! Arjun Bijanki Microsoft Visual C++

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Formal Review: The Spirit Parser Framework.
by John Maddock 14 Oct '02

14 Oct '02

The formal review for the Spirit Parser Framework begins today, and runs until the end of Sunday 20th October. Discussion should take place on the main boost developer list (boost(a)lists.boost.org) please state in your review whether you think the framework should be accepted into boost or not. The framework can be downloaded from: http://spirit.sourceforge.net/index.php?doc=download/v1_5.html Synopsis: ~~~~~~ Spirit is an object oriented recursive descent parser generator framework implemented using template meta-programming techniques. Expression templates allow us to approximate the syntax of Extended Backus Normal Form (EBNF) completely in C++. Parser objects are composed through operator overloading and the result is a backtracking LL(inf) parser that is capable of parsing rather ambiguous grammars. The Spirit framework enables a target grammar to be written exclusively in C++. Inline EBNF grammar specifications can mix freely with other C++ code and, thanks to the generative power of C++ templates, are immediately executable. In retrospect, conventional compiler-compilers or parser-generators have to perform an additional translation step from the source EBNF code to C or C++ code. Regards, John Maddock (Spirit review manager). http://ourworld.compuserve.com/homepages/john_maddock/index.htm

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Type traits direct compiler support
by Edward Diener 14 Oct '02

14 Oct '02

What does it mean in the type_traits documentation that "direct compiler support for that traits class is required" ? I do not see that terminology explained anywhere and am lost as far as to what it refers.

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RedHat 7.3
by S. Scott Collis 14 Oct '02

14 Oct '02

I appologize if this has been addressed before. I did a quick search of the of the new group and didn't find anything. I just tried to port a code that uses Boost to a new computer loaded with RedHat 7.3. It seems that in 7.3 the /usr/include/asm/atomic.h header is different and generates a warning (i.e. #warning Using kernel header in userland program. BAD! instead of supplying routines like atomic_add and atomin_sub that are apparently required by Boost for the shared_ptr implementation. I ended up replacing this 7.3 header with one from 7.1 and this fixed the problem, but if anyone has a better solution, I would appreciate it. Thanks, Scott -- ===================================================================== Dr. Scott Collis, Asst. Prof. | Tel: (713) 348-3617 Dept. of Mechanical Engineering | Fax: (713) 348-5423 and Materials Science - MS 321 | Rice University | Email: collis(a)rice.edu Houston, TX 77005-1892 | http://mems.rice.edu/~collis =====================================================================

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d:\boost\boost_1_29_0\libs\thread\src\thread.cpp(107) : error C2065: '_beginthre
by satya_vajja 13 Oct '02

13 Oct '02

Hello, I am getting the following error while i compile boost thread library under VC++ 6.0. Could any of you please help me out. d:\boost\boost_1_29_0\libs\thread\src\thread.cpp(107) : error C2065: '_beginthreadex' : undeclared identifier When i define _MT compile flag the compiling error goes off but i get lot of linker errors. satya_vajja(a)yahoo.com Thanks Satya

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regex questions in 1_29_0 with g++ 3.1.1
by Anibal Jodorcovsky 13 Oct '02

13 Oct '02

Hi all, I've been using regex 3.20 with g++ 2.95.3 with no problems. We're in the process of moving towards g++ 3.1.1 (we have a library we need to use and it core dumps with 2.95.3 due to a bug in the stdc++ that goes with it in ofstream). So, I have g++ 3.1.1 working fine in redhat 6.2. I couldn't find the regex standalone library so I ended up downloading the whole boost suite (1_29_0) and I built only the regex++ library. I have one comment regarding this version (which I don't know what it is BTW. What's the version of regex++ in boost 1_29_0?, I guess it's 3.31). It seems that boost:cmatch doesn't work anymore when doing a regex_search, I ended up modifying boost:cmatch with boost::match_results<std::string::const_iterator>, I hope that's ok. I'm also having some trouble compiling some code but this is a problem with the new STL implementation that ships with g++ 3.1.1 (the v3 STL). I can't seem to find the solution, that's why I'm asking here, if anybody has any pointers I'll be very grateful. Look at what I get: commit.cpp: In function `void findSopInstances(IDB_HANDLE**, const std::vector<CommitSopInfo, std::allocator<CommitSopInfo> >&, std::vector<CommitSopInfo, std::allocator<CommitSopInfo> >&, std::vector<CommitSopInfo, std::allocator<CommitSopInfo> >&)': commit.cpp:737: conversion from `__gnu_cxx::__normal_iterator<const CommitSopInfo*, std::vector<CommitSopInfo, std::allocator<CommitSopInfo> > > ' to non-scalar type `__gnu_cxx::__normal_iterator<const CommitSopInfo*, std::vector<const CommitSopInfo, std::allocator<const CommitSopInfo> > >' requested commit.cpp:738: no match for `__gnu_cxx::__normal_iterator<const CommitSopInfo*, std::vector<const CommitSopInfo, std::allocator<const CommitSopInfo> > >& < __gnu_cxx::__normal_iterator<const CommitSopInfo*, std::vector<CommitSopInfo, std::allocator<CommitSopInfo> > >' operator commit.cpp:742: cannot convert `__gnu_cxx::__normal_iterator<const CommitSopInfo*, std::vector<const CommitSopInfo, std::allocator<const CommitSopInfo> > >' to `const CommitSopInfo*' for argument `2' to `bool haveSopInstance(IDB_HANDLE**, const CommitSopInfo*)' commit.cpp: In function `int buildSopSeq(const std::vector<CommitSopInfo, std::allocator<CommitSopInfo> >&, SQ_TYPE, void***)': commit.cpp:913: conversion from `__gnu_cxx::__normal_iterator<const CommitSopInfo*, std::vector<CommitSopInfo, std::allocator<CommitSopInfo> > > ' to non-scalar type `__gnu_cxx::__normal_iterator<const CommitSopInfo*, std::vector<const CommitSopInfo, std::allocator<const CommitSopInfo> > >' requested commit.cpp:914: no match for `__gnu_cxx::__normal_iterator<const CommitSopInfo*, std::vector<const CommitSopInfo, std::allocator<const CommitSopInfo> > >& < __gnu_cxx::__normal_iterator<const CommitSopInfo*, std::vector<CommitSopInfo, std::allocator<CommitSopInfo> > >' operator make: *** [commit.o] Error 1 And the code it complains about is this: static void findSopInstances( IDB_HANDLE** idbHandle, const std::vector<CommitSopInfo>& rSopList, std::vector<CommitSopInfo>& rSuccesses, std::vector<CommitSopInfo>& rFailures ) { static const char * func = "(findSopInstances)"; // Iterate over list of SOP instances for ( std::vector<const CommitSopInfo>::iterator pos = rSopList.begin(); pos < rSopList.end(); pos++ ) { // Test whether we have this instance if ( haveSopInstance( idbHandle, pos ) ) { ...... Where haveSopInstance is defined as: static bool haveSopInstance( IDB_HANDLE** idbHandle, const CommitSopInfo* pSopInfo ) { now, this used to compile fine under g++2.95.3 with its stdc++. I don't see why it's having difficuly converting the interator to the CommitSopInfo*. Any ideas? thanks a lot, -Anibal

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controlling edge sequence during traversal
by Jakub Plichta 12 Oct '02

12 Oct '02

Hello I am using an adjacency list graph. During a dfs traversal I would like to be control the order of edge traversal. Specifically I have an edge property with an index value and I would like to traverse the higher index edges first. I have tried getting the out_edges iterator and resorting the edges base on their index but that does not seem to make any difference. Any suggestions would be very greatly appreciated. Thanks Jakub Plichta [Non-text portions of this message have been removed]

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RE: [Boost-Users] Re: boost vs. The Lawyers (non-technical)
by Elliot Murphy 11 Oct '02

11 Oct '02

That would be helpful. Some of my colleagues have had terribly frustrating experiences trying to get our lawyers to approve the use of various boost libraries. The lawyers don't seem to like the idea of going into every source file to read a license agreement. -elliot -----Original Message----- From: James Curran/MVP [mailto:jamescurran@mvps.org] Sent: Thursday, October 10, 2002 9:58 AM To: boost-users(a)yahoogroups.com Subject: [Boost-Users] Re: boost vs. The Lawyers (non-technical) "Douglas Gregor" <gregod(a)cs.rpi.edu> wrote in message news:200210090000.23639.gregod@cs.rpi.edu... > Each Boost library has its own license that _must_ meet those requirements. Of > course, that won't satisfy the lawyers, so you'll probably have to send them > the individual library licenses for approval. > > We really could do much better in this area: at the very least, we could > provide a comprehensive list of the licenses for each library. Perhaps we should add to our "standard" a requirement that a printable license page by included with each libraries' documentation (with one or more "fill-in-the-blank" templates/samples available on www.boost.org) -- Truth, James Curran www.NovelTheory.com (Personal) www.NJTheater.com (Professional) www.aurora-inc.com (Day job) Yahoo! Groups Sponsor ADVERTISEMENT Info: <http://www.boost.org> Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.

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RE: [Boost-Users] Problem with boost::any.
by Jim.Hyslop 11 Oct '02

11 Oct '02

Luc Bergeron [mailto:bluc@videotron.ca] wrote: > Greets, > > I'm trying to use the boost::any component but i'm having > problem with > it !!! I'm using it because I need a way to store parameters of > different type. That real fine but I can't retrieve the value > from the > boost::any. This is what i've tried : > > std::string GetStringFromAny(const boost::any& val) const > { > std::string strVal; > try > { > strVal = boost::any_cast<std::string>(val); > } > catch(boost::bad_any_cast &err) > { > std::cerr << err.what() << std::endl; > return ""; > } > return strVal; > } > > But I always have a bad_any_cast exception. From the > documentation, at > leats what I understand of it, "If passed a value or reference, it > returns a copy of the value content if successful". Can > someone point me > in the right direction as to how can I extract the value within a > boost::any type, I think i'm lost !!! :) The following program works for me, without any error (using MSVC6): #include <boost/any.hpp> #include <string> #include <iostream> std::string GetStringFromAny(const boost::any& val) { std::string strVal; try { strVal = boost::any_cast<std::string>(val); } catch(boost::bad_any_cast &err) { std::cerr << err.what() << std::endl; return ""; } return strVal; } int main() { boost::any anAny( std::string("Hello, world") ); std::string converted = GetStringFromAny( anAny ); std::cout << "Converted: [" << converted << "]" << std::endl; } The output, as I expected, was: Converted: [Hello, world] Note that if I add more to main: int main() { boost::any anAny( std::string("Hello, world") ); std::string converted = GetStringFromAny( anAny ); std::cout << "Converted: [" << converted << "]" << std::endl; anAny = 23; converted = GetStringFromAny( anAny ); std::cout << "Converted: [" << converted << "]" << std::endl; } the second conversion fails. The conversion will only succeed if the type that boost::any currently holds can be implicitly converted into the type you want to retrieve. If you want to convert from (for example) an int to a string, you'll need boost::lexical_cast. -- Jim -- Jim

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Problem with boost::any.
by Luc Bergeron 11 Oct '02

11 Oct '02

Greets, I'm trying to use the boost::any component but i'm having problem with it !!! I'm using it because I need a way to store parameters of different type. That real fine but I can't retrieve the value from the boost::any. This is what i've tried : std::string GetStringFromAny(const boost::any& val) const { std::string strVal; try { strVal = boost::any_cast<std::string>(val); } catch(boost::bad_any_cast &err) { std::cerr << err.what() << std::endl; return ""; } return strVal; } But I always have a bad_any_cast exception. From the documentation, at leats what I understand of it, "If passed a value or reference, it returns a copy of the value content if successful". Can someone point me in the right direction as to how can I extract the value within a boost::any type, I think i'm lost !!! :) Thanks in advance for any help. Luc.

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Possible bug in boost_1_28
by Christopher Henrich 11 Oct '02

11 Oct '02

This bug comes up when I try to include <boost/array.hpp> in certain CodeWarrior projects. (CodeWarrior 8.0, running under Mac OS 10.1.5 on G3 "beige tower") If I initialize the project with stationery "C++ Console Mach-O", and I change HelloWorld.cp to include <boost/array.hpp>, then I get this error message: Error: undefined identifier 'ptrdiff_t' suffix.hpp line 204 included from config.hpp: 57 array.hpp:27 HelloWorld.cp: 10 If I initialize with PowerPlant stationery, I do not have this problem. Chris Henrich

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BOOST regex problem using Libarys with Borland Builder 4
by Alastair 11 Oct '02

11 Oct '02

Hi I have just found out about the boost library's so I am new to them. I am trying to use the regex within a VCL Borland Builder 4. I have followed the installation. and tried a given example. I found that the example works well for a console program but for a windows program it seems to crash with the message. EAccessViolation with message ŽAccess violation at address 0040987B. Read address 00000032. I have compiled both within the Borland IDE and I believe that I don't have to do anything and that the IDE and Library will automatically configure itself. What am I doing wrong? Thanks in advance Alastair

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Thread Lib Build errors in xtime.cpp
by Glenn Thorne 10 Oct '02

10 Oct '02

I'm getting the following errors when trying to build Boost using the Intel C++ v6.0 compiler. The build completes as expected with msvc. Is there a problem with boost::uint64_t in this configuration or am I missing a setting somewhere? Any help will be appreciated. Thanks! Glenn ******** C:\boost_1_28_0>set INTELC="C:\Program Files\Intel\Compiler60\IA32" C:\boost_1_28_0>bjam "-sTOOLS=intel-win32" ...found 330 targets... ...updating 12 targets... vc-C++ libs\thread\build\bin\libboost_thread.lib\intel-win32\debug\runtime-link- static\threading-multi\xtime.obj xtime.cpp libs\thread\build\../src\xtime.cpp(80): error: namespace "boost" has no member " uint64_t" const boost::uint64_t TIMESPEC_TO_FILETIME_OFFSET = ((boost::uint64_t) 27111902UL << 32) + (boost::uint64_t)3577643008UL; ^ libs\thread\build\../src\xtime.cpp(80): error: namespace "boost" has no member " uint64_t" const boost::uint64_t TIMESPEC_TO_FILETIME_OFFSET = ((boost::uint64_t) 27111902UL << 32) + (boost::uint64_t)3577643008UL; ^ libs\thread\build\../src\xtime.cpp(80): error: expected a ")" const boost::uint64_t TIMESPEC_TO_FILETIME_OFFSET = ((boost::uint64_t) 27111902UL << 32) + (boost::uint64_t)3577643008UL; ^ libs\thread\build\../src\xtime.cpp(80): error: namespace "boost" has no member " uint64_t" const boost::uint64_t TIMESPEC_TO_FILETIME_OFFSET = ((boost::uint64_t) 27111902UL << 32) + (boost::uint64_t)3577643008UL; ^ libs\thread\build\../src\xtime.cpp(80): error: expected a ";" const boost::uint64_t TIMESPEC_TO_FILETIME_OFFSET = ((boost::uint64_t) 27111902UL << 32) + (boost::uint64_t)3577643008UL; ^ compilation aborted for libs\thread\build\../src\xtime.cpp (code 2) "C:\Program Files\Intel\Compiler60\IA32/bin/icl" /Zm400 -nologo -GX -c /Z 7 /Od /Ob0 /GX /GR MTd -I"libs\thread\build" -I"C:\boost_1_28_0" -I"C:\PROGR A~1\MICROS~3\VC98\include" -I"../include" -Fo"libs\thread\build\bin\libboo st_t hread.lib\intel-win32\debug\runtime-link-static\threading-multi\xtime.obj" -Tp" libs\thread\build\../src\xtime.cpp" ...failed vc-C++ libs\thread\build\bin\libboost_thread.lib\intel-win32\debug\run time-link-static\threading-multi\xtime.obj... ...skipped <libs!thread!build\libboost_thread.lib\intel-win32\debug\runtime-link -static\threading-multi>libboost_thread.CMD for lack of <libs!thread!build\libbo ost_thread.lib\intel-win32\debug\runtime-link-static\threading-multi>xtime.o bj.. . ...skipped <libs!thread!build\libboost_thread.lib\intel-win32\debug\runtime-link -static\threading-multi>libboost_thread.lib for lack of <libs!thread!build\libbo ost_thread.lib\intel-win32\debug\runtime-link-static\threading-multi>xtime.o bj.. . ********

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CVS fails to build
by Björn Lindberg 10 Oct '02

10 Oct '02

Boost CVS isn't working for me right now. When I try to build programs against it I get /home/compbio/d95-bli/include/boost/preprocessor/cat.hpp:18:49: boost/preprocessor/config/config.hpp: Filen eller katalogen finns inte /home/compbio/d95-bli/include/boost/preprocessor/cat.hpp:22:28: missing binary operator before '(' /home/compbio/d95-bli/include/boost/preprocessor/cat.hpp:29:28: missing binary operator before '(' ... Is it (a) a bug, or (b) me doing something wrong, or (c) something else? I am running g++-3.2 on GNU/Linux. Björn

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boost vs. The Lawyers (non-technical)
by Brian Neal 10 Oct '02

10 Oct '02

I hope this is appropriate for this mailing list... I am a software engineer and our development team loves boost. However, I can already see a coming battle with our company lawyers trying to convince them to let us use boost in our software. We informally talked with one of our software quality engineers. He said their major concern would be assuring that we had permission to use the boost software. In other words, how would we know that the boost developers had permission to release their libraries so that anyone could use it? He also thought we would need something in writing to this effect. Since their isn't any official boost organization, I am getting scared already. I am not a lawyer, nor do I play one on TV, but I would like to hear from any boost developer or user who has experiences in dealing with this nonsense. 1) How did you get your company lawyers off your backs and let you use boost? 2) Should there be (is there?) a central boost license that all boost libraries have that we can point our lawyers at, instead of going to each and every boost developer to get permission to use his/her library? 3) What has been your experience in this situation? Its ironic that something as wonderful as boost, which gives us so much productivity (and that savings is passed along to our customers) could be considered so dangerous by our lawyers. Again, if this is not appropriate or has been rehashed to death I apologize. If that is the case, please email me off list. I'll collect the responses and give them to anyone who is interested. Thanks, Brian Neal

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tuple vs SGI/MIPSPro
by Kevin Wheatley 10 Oct '02

10 Oct '02

Hi, I'm starting to get to grips with boost and in particular on the SGI platform. I was trying to use the boost::tuples and found that with the SGI compiler v7.3.1.3m I was getting the following error CC -LANG:std -I/images/src/boost/from_cvs/boost -I/images/src/boost/from_cvs/boost/boost/compatibility/cpp_c_headers/ -o tupple tupple.cpp cc-1239 CC: ERROR File = /images/src/boost/from_cvs/boost/boost/tuple/tuple_io.hpp, Line = 113 "close" is ambiguous. case close : c = i.widen(')'); break; ^ A template was detected during header processing. instantiation of "char boost::tuples::detail::format_info::get_manipulator(std:: basic_ios<char, std::char_traits<char>> &, boost::tuples::detail::format_info::manipulator_type)" at line 437 instantiation of "std::basic_istream<char, std::char_traits<char>> &boost::tuples::detail::extract_and_check_delimiter(std:: basic_istream<char, std::char_traits<char>> &, boost::tuples::detail::format_info::manipulator_type)" at line 511 instantiation of "std::basic_istream<char, std::char_traits<char>> &boost::tuples::operator>>(std::basic_istream<char, std::char_traits<char>> &, boost::tuples::cons<double, boost::tuples::detail::map_tuple_to_cons<double, double, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>::type> &)" at line 630 of "/usr/include/CC/stl_iterator.h" instantiation of "void std::istream_iterator<density, char, std::char_traits<char>, ptrdiff_t>::_M_read()" at line 604 of "/usr/include/CC/stl_iterator.h" instantiation of "std::istream_iterator<density, char, std::char_traits<char>, ptrdiff_t>::istream_iterator(std::istream_iterator<densit y, char, std::char_traits<char>, ptrdiff_t>::istream_type &)" at line 19 of "tupple.cpp" I'm working with the code from CVS because it compiled better on the SGI, I looked at the code, and basically I think it's getting confused due to my test program including a "using namespace std;" so I modified the tuple_io.hpp to specifically mention detail::format_info::close rather than the bare close and then my example works (I also made explicit the other cases of the switch statement). Is there a more recomended way of doing this? Almost everywhere else in that file the full specification of the enum is given. My code is something like: #include <vector> #include <iostream> #include <algorithm> #include <numeric> #include <iterator> #include "boost/tuple/tuple.hpp" #include "boost/tuple/tuple_comparison.hpp" #include "boost/tuple/tuple_io.hpp" using namespace std; using namespace boost::tuples; typedef tuple<double, double, double> density; int main() { vector<density> v; istream_iterator<density> in(cin); istream_iterator<density> eos; ostream_iterator<density> out(cout); density total; copy(in, eos, back_inserter(v)); copy(v.begin(), v.end(), out); cout << endl; return 0; } Thanks Kevin -- | Kevin Wheatley | These are the opinions of | | Senior Do-er of Technical Things | nobody and are not shared | | Cinesite (Europe) Ltd | by my employers |

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Building regex on AIX w VisualAge
by Tim Daplyn 10 Oct '02

10 Oct '02

Can anyone assist me with this? I've tried every compiler option I can think of combined with disabling BOOST support for a whole bunch of stuff and I still can't get this library to build on AIX. There are just too many compile errors, and I was really hoping I wouldn't have to go modifying the source.

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How to Create Calculated Internal Properties?
by Phillip Ratzloff 10 Oct '02

10 Oct '02

I wish to create an internal calculated property that is derived from existing properties in a vertex or edge. Id also like to be able to access it like any other internal property. For instance, I want a vertex property called weight_sum that would sum the weights for all the out edges and return the answer. I want to be able to use a statement "get(vertex_weight_sum,G,v)" to get the value. Later on, I may decide that I want to cache the value on the vertex (like a normal property) and existing code should work without change. I have been unable to figure out any template class specializations to do this. Additionally, if I try to define the property using the property<> template in the graph declaration it reserves storage for the property, which is undesired. Am I missing something? Is there a way to define a calculated internal property that doesnt reserve storage?

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using weak_ptr and shared_ptr for singleton
by Stephan Born 09 Oct '02

09 Oct '02

Hello! I do some experiments on shared_ptr and weak_ptr. So I tried to use them for a singleton-class, which does not need an explicit singleton::release_instance method. The singleton-instance will be destroyed everytime the last external shared_ptr holding the instance goes out of scope. Is this a valid usage for weak_ptr? Are there any traps I do not see using these smart_ptrs in this context? The drawback of using shared_ptr with singleton is the need for a public destructor. But this is dangerous....it is possible to write singleton::singleton_ptr first_ptr = singleton::instance(); delete first_ptr.get(); Declaring the destructor as private is only possible when defining boost::checked_delete as friend of the singleton-class. ( there is a thread on comp.lang.c++.moderated with the topic 'specialization of function template as friend with MSVC6SP5 not possible' which deals with this problem of friendship... ) But then it is still possible to write the following code singleton::singleton_ptr first_ptr = singleton::instance(); boost:checked_delete( first_ptr.get() ); OK, it's very unlikely to do it by chance, but it is possible. Is there a way to allow destruction of the instance only to shared_ptr? <code> #include <boost/shared_ptr.hpp> #include <boost/weak_ptr.hpp> #include <boost/utility.hpp> class singleton : boost::noncopyable { public: typedef boost::shared_ptr< singleton > singleton_ptr; static singleton_ptr instance() { singleton_ptr tmp; if( s_instance.expired() ) { tmp.reset( new singleton ); s_instance = tmp; } else { tmp = boost::make_shared( s_instance ); } return tmp; } void foo() { // do something i++; } // like to make it private in order to prohibit delete on it, // but boost::shared_ptr<> can't handle it....so sad :( ~singleton(){}; private: typedef boost::weak_ptr< singleton > internal_singleton_ptr; singleton(){}; int i; static internal_singleton_ptr s_instance; }; singleton::internal_singleton_ptr singleton::s_instance; int main() { { singleton::singleton_ptr first_ptr = singleton::instance(); { singleton::singleton_ptr second_ptr = singleton::instance(); second_ptr->foo(); } first_ptr->foo(); } singleton::singleton_ptr another_ptr = singleton::instance(); another_ptr->foo(); return 0; } </code> Regards, Stephan -- --------------------------------------------------------------- Dipl.-Inf. (FH) Stephan Born | beusen Solutions GmbH fon: +49 30 549932-0 | Landsberger Allee 366 fax: +49 30 549932-21 | 12681 Berlin mailto:stephan.born@beusen.de | Germany --------------------------------------------------------------- PGP-Key verfügbar | PGP-Key available ---------------------------------------------------------------

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