January 2008 - Boost-users - lists.preview.boost.org

null_ptr?
by Robert Dailey 03 Jan '08

03 Jan '08

Hi, Does boost have some sort of null_ptr class that allows you to do portable NULL comparisons? For example, the following isn't portable: char* foo = 0; if( foo != 0 ) { } But this is portable: char* foo = reinterpret_cast<char*>( 0 ); if( foo != reinterpret_cast<char*>( 0 ) ) { } You could easily create a null_ptr class with a few global template operators to make this easy, so you could do this: char* foo = boost::null_ptr; if( foo != boost::null_ptr ) { } Is there such a thing? Thanks.

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Building boost with msvc 9 x64
by Chrissi13378 Chrissi13378 03 Jan '08

03 Jan '08

Hello, i recently upgraded from msvc 8 to 9. Now I have to rebuild all my libraries, including boost. To do so, I am executing bjam --without-mpi --without-python --toolset=msvc-9.0_64 address-model=64 install bjam --without-mpi --without-python --toolset=msvc-9.0_64 address-model=64 clean in the Visual Studio x64 build command promt. I am using an own-built bjam executable using the nightly build code (1.1.08) and the boost files from the current CVS (1.1.08) Unfortunately, once the build starts, a windows message appears, asking me how to open "execution_monitor.obj.rsp". How can I fix this error? -Christoph I am using Windows Vista x64 and --------------------------------- Ihr erstes Fernweh? Wo gibt es den schönsten Strand.

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upcoming Switch library review Jan 5th - Jan 9th
by Stjepan Rajko 02 Jan '08

02 Jan '08

The review of the Switch library by Steven Watanabe will begin this Saturday, Jan 5th. Description: The built in C/C++ switch statement is very efficient. Unfortunately, unlike a chained if/else construct there is no easy way to use it when the number of cases depends on a template parameter. The Switch library addresses this issue. You can download the library from the Boost Vault: http://tinyurl.com/23qn7w For convenience, the docs have been uploaded here: http://tinyurl.com/2h6ut9 ... and the source file here: http://tinyurl.com/2cbfyk If you are interested, please consider submitting a review of this library. I will send more detailed instructions on what to include in the review on the 5th. Regards, Stjepan

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[Serialization] Can I load two object from one input file?
by sjdf 02 Jan '08

02 Jan '08

Hi all, Code like this: // Save std::ofstream ofs( "c.out" ); A testA1; B testB1; testA1.Save( ofs ); testB1.Save( ofs ); ofs.close(); // Load std::ifstream ifs( "c.out" ); A testA11; B testB11; testA11.Load( ifs ); testB11.Load( ifs ); The testA1 and testB1 can save successful, and the testA11 can load successful, but when loading testB11, it throw a exception "invalid_signature". I have trace into the code, I found when the testA11 loading, the "file_signature" is "serialization::archive", but when testB11 loading, the "file_signature" is empty. Why it like this? What should I do? May be there is the same question before I ask, but I don't know what keyword could be search, sorry. Thanks!

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[Serialization] Is there anybody has experience in writting DBArchive?
by sjdf 02 Jan '08

02 Jan '08

Hi all, I'm working on a project, it consists of 2 parts: application & framework. The application uses the interfaces of the framework which based on a OODB. Now, my task is to replace the OODB with a relational database. So, I have to do the serialization of the object by myself. I don't know how to design the DBArchive, since I don't know how to deal with the inheritance relation and reference relation between the objects. The DBAchive is different from the TextArchive, the letter is a stream, but the former's storage unit is a record that consists of the object's data members and the field name in the database table. If the recursive model of the boost serialization can process this case? Could you give me any suggestions? Thanks a lot! sjdf

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Problems building 1.34 with Intel toolset on Win32
by Lipik Contact 02 Jan '08

02 Jan '08

Hi, I am trying to build 1.34 with Intel compiler (have tried with 9.0 as well as 10.1 - same results). bjam appears to skip building the library linked to debug runtime (libboost*-*gd*.lib), and autolink looks for these libraries when linking projects that use boost. I see the same problem with 9.0 as well. I added the icl.exe path to my user-config.jam, as suggested in an earlierpost on this list. I also got the 1.35 dev version from CVS, and it also has the same problem. Any help would be greatly appreciated. My bjam command-line is: bjam --v2 -a toolset=intel-10.1 variant=debug link=static --build-dir=C:\Exp\build-boost --without-graph --without-wave --without-serialization --without-python -sICU_PATH=C:\DevLibraries\icu stage On a related note, bjam seems to ignore compiler flags passed in the command line.i.e., I try to build the release as: .\bjam --v2 -a toolset=intel-10.1 variant=release link=static cxxflags=-QxO --build-dir=C:\Exp\build-boost --without-graph --without-wave --without-serialization --without-python -sICU_PATH=C:\DevLibraries\icu stage but /QxO compiler option is never enabled when compiling. Thanks Amit

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VS2005 with boost and /CLR
by Jason McGuidwin 02 Jan '08

02 Jan '08

I want to use the boost libraries with VS2005 and CLR option. how did you do this? how do you do this? I can get it to work without clr but I need to use managed and unmanaged code.

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Port QT call to BOOST
by j.c. 01 Jan '08

01 Jan '08

Hi, I am looking to port a single call of QT code: connect(m_task, SIGNAL(finished(task *)), this, SLOT(on_finished(task *))); I am not that familiar with QT, SLOTS or SIGNALS, but what I believe this to be doing is binding the SIGNAL function finished() from class "task" to my other "class" so that it will fire on_finished(). If anyone can give me some insight on how to boostify this, that would be great, as I have not touched that area just yet. Thanks, j

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