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[serialization] Removing empty classes
by Loïc Joly 01 Feb '06

01 Feb '06

Hello, Let's say I have a structure suce as this : class A {}; class B : public A {}; class C : public B {}; Currently, I have some code that looks like this : template<class Archive> void C::serialize(Archive &ar, const unsigned int version) { ar & BOOST_SERIALIZATION_BASE_OBJECT_NVP(B); } However, if my class B is "empty", that is it adds no data to A, is this possible as an optimisation to just write : template<class Archive> void C::serialize(Archive &ar, const unsigned int version) { ar & BOOST_SERIALIZATION_BASE_OBJECT_NVP(A); } Or will this break something ? -- Loïc

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Re: [Boost-users] [serialization] compile error
by cheesy4poofs 01 Feb '06

01 Feb '06

>Try removing the line > >> #include <boost/serialization/type_info_implementation.hpp> > >And let me know that happens. > >I believe this problem is a remnant of a header depency issue which will be addressed in > the next release. > >Robert Ramey Thanks for the response. I actually didn't have that #include in my original code. I added it in a futile attempt to see if that would fix the issue. I still see the same compile errors when I remove that #include line. Scott

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[Serialization]: bug while serializing a std:string
by RIVASSEAU Jean Noel 01 Feb '06

01 Feb '06

Hello It seems I have come against a bug in the BSL. I am running on Win 2000 Pro, MinGW (gcc 3.4.2), Boost 1.33.1. If I serialize a standard string with 512 or more characters, the save goes ok but a stream error exception occurs while trying to reload it later from archive. Any string with size < 512 is ok. Also this bug is really strange. It does not happen if the string has no line breaks in it (even if it is more than 512 chars). It also happens on my program, but I was unable to reproduce it with a small test program, even using the same string. Could it be a bug in another part of my rather large program? Or is it really a bug in the BSL? Jean-Noël

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Bug with std::string in the BSL
by RIVASSEAU Jean Noel 01 Feb '06

01 Feb '06

Hello Following my previous message, I have not been able to track down the bug. What I noticed is that the stream error occurs after the loading of the std::string (on the next load operation), however the loaded string is not correct (eg, even if the exception is thrown later, the problem lies with the strings of length >= 512). Robert, if you cannot look into that, can you give me some pointers about where should I look to debug this problem? I am using a text archive. Hints about the implementation code would be useful for me. Thank you Jean-Noël

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[date_time] Constructing a ptime with __int64
by Christian Henning 01 Feb '06

01 Feb '06

Hi there, is it possible to construct a ptime with an __int64. The internal representation is of the same type. I couldn't find anything on this issue. Thanks in advance, Christian

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Re: [Boost-users] Using lambda to count elements in list of lists
by Daniel Lidström 01 Feb '06

01 Feb '06

Sebastian Redl scribbled: > Yes, but you need binding syntax: > > typedef list< list< int > > lli; > for_each(ll.begin(), ll.end(), var(count) += bind(&lli::size, _1)); Thanks to both Sebastian and Stuart! Hälsningar, Daniel

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Compiling boost with vacpp 8.0 as 64bit on AIX5.3ml3 of power5
by Kamil Marcinkowski 01 Feb '06

01 Feb '06

Hello, I need to compile boost as a 64 bit program using vacpp 8.0 compiler, on AIX 5.3ml3, power5, p5-550 and p5-595. I can compile boost with vacpp in 32bit mode fine, but all my attempts at compiling it 64 bit have not resulted with any success so far. The vacpp toolset does not offer any options and does not allow for any options or configuration variables. I do not understand the syntax of the vacpp-tools.jam file or (bjam in general) and cannot edit the file with any success. I just need the following flags passed to the compiler: <cxxflags> -q64 <linkflags> -q64 <arflags> -q64 Thanks, Kamil Kamil Marcinkowski Westgrid System Administrator kamil(a)ualberta.ca University of Alberta site Tel.780 492-0354 Research Computing Support Fax.780 492-1729 Academic ICT (formerly CNS) Edmonton, Alberta, CANADA University of Alberta "This communication is intended for the use of the recipient to which it is addressed, and may contain confidential, personal, and/or privileged information. Please contact us immediately if you are not the intended recipient of this communication. If you are not the intended recipient of this communication, do not copy, distribute, or take action on it. Any communication received in error, or subsequent reply, should be deleted or destroyed."

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unresolved program_options::arg
by Matthieu Paindavoine 01 Feb '06

01 Feb '06

Hello, I am compiling a program which uses the program_options library, and I am getting an unresolved symbol (boost::program_options::arg class std::basic_string<char, struct std::traits<char>, class std::allocator<char> > ). This is using the vc-7_1 toolset (boost 1.33.1, bjam --v2). I don't have such problem on Linux g++ 3.4.4 I see it in the value_semantic.cpp. If I play with setting <boost/config/user.hpp : BOOST_ALL_DYN_LINK> I can get it to compile, but it sends a warning 'inconsistent linkage', and later crashes on dbgheap.hpp I have compiled program_options with --v2 -stoolset=vc-7_1 -slink=shared -sthreading=multi -svariant=debug, and the same with my program. I've also added -sruntime-link=dynamic, same problem. Are there other options that need to be set before compiling program_options? Where is arg going to be defined if its external? I know it's something I'm doing wrong, can someone please help. Thanks Matthieu

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Using lambda to count elements in list of lists
by Daniel Lidström 01 Feb '06

01 Feb '06

Hello! I'm trying to use Boost.Lambda to count the total number of elements in a list of lists. This example shows what I'm trying to do: #include <boost/lambda/lambda.hpp> #include <algorithm> #include <list> using namespace std; using namespace boost::lambda; int main() { int count = 0; list<list<int> > ll; for_each(ll.begin(), ll.end(), var(count)+=(_1).size()); } This will not compile: (13): error C2039: 'size': is not a member of 'boost::lambda::lambda_functor<T>' Is this possible to do? Thanks in advance! Hälsningar, Daniel

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Boost Threads documentation
by James Hughes 01 Feb '06

01 Feb '06

Hello all, I am reading thought he thread docs on the Boost site, which are all dated around 2004/2005. Is there any more recent documentation, as this stuff refers to features not yet present, which I think are there now. James

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