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Serialization: crash at launch of program (due to boost::serialization::base_object)
by RIVASSEAU Jean Noel 05 Apr '06

05 Apr '06

Hello, My program crashes at launch (not even a exit(0) as the first line of main(int argc, char *argv[]) will stop it from crashing), due to the BSL. What I am trying to do is: I have a class, whose serialization is split (eg, save and load functions are provided, and they are different). Now this class had a parent class, so I used to call boost::serialization::base_object<MObject>() on the base class MObject. However I want to change the parent of my class to a different class. I also want to update my old archives, so I decided to leave the load function of my class untouched, while I would change the save function, to update the call to base_object to the new parent class (not MObject anymore). I thought it would work, since it would load the old archive using the same method, but save it using the new, so I would have ran only one time the program and the archive would be updated (then, of course, before running it again I would have to recompile it one more time with the correct changes to the load function). But it does not work as expected, since it seems the BSL does not like the fact that save and load functions calls to boost::serialization::base_object do not specify the same base class. It does not complain at compile time but crashes at run time before even entering main and certainly before loading any archive. The crash is due to a NULL pointer, I have tried to debug with gdb but the crash apparently occurs on the _libkernel32_a_iname () so I do not not know where it is (too low level for me). Robert, do you have an idea what is going on? I suspect a bug - however if it is "normal" behaviour (I think it should then throw an exception rather than crash), do you have an idea how could I update my archives? I need to change the parent of this class, but need to be able to read my old archives - and changing them "by hand" by looking into the XML archive code is tool hard. Thank you, regards Jean-Noël Rivasseau

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Re: [Boost-users] Idea for equation library
by james.jones＠firstinvestors.com 05 Apr '06

05 Apr '06

Stephen Gross wrote: > The idea is that you can encapsulate an algebraic function in a standalone > 'Equation' instance, and dynamically reassign that equation. It's built off > of boost::lambda (of course), but it lets you name the variables rather than > just refer to them with the standard placeholders (_1, _2, etc.). Is it > worthwhile for me to post the toolkit code on this group? I'd love to see this. But it should be called "Expression", not "Equation" - the concepts you'd be creating aren't "equations". Equation: x + y = z Expression: x + y - James

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Confusion on The Directory Structure For serialization library
by Cheok Yan Cheng 05 Apr '06

05 Apr '06

You might thoroughly read http://www.boost.org/more/getting_started.html#Build_Install. Where under the Results section, the naming convention is described. -------------------------------------------------------- That's cool! I get the naming convention I want after running bjam install. Thank you very much! __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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Boost.Filesystem
by Elisha Berns 05 Apr '06

05 Apr '06

I asked this two weeks ago but didn't get any reply: Can file locking and permission setting be added to Boost.Filesystem? Elisha Berns

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Re: [Boost-users] [Serialization] a newbie question about retrieving objects serialized through base class pointers
by t.sammoud 05 Apr '06

05 Apr '06

Robert Ramey wrote: >If BOOST_CLASS_EXPORT is used, the class name is included as an attribute in >the xml file. >Otherwise, the class_id variable - another xml attribute is used. This is >set/recovered by the >"registration" process. I understood from the documentation that BOOST_CLASS_EXPORT works for classes which derive from a virtual base class, which isn't really the case for me. Is it possible to add class names as attributes to xml archives even for classes which aren't serialized through base class pointers? If there is a way, this would really helps me Thanks Accédez au courrier électronique de La Poste : www.laposte.net ; 3615 LAPOSTENET (0,34 /mn) ; tél : 08 92 68 13 50 (0,34/mn)

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bjam build question
by Joe McCay 05 Apr '06

05 Apr '06

Is it possible to specify a clean build from scratch, or do you have manually delete the object files and stuff? jmccay

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'Function String' parser question
by K M 05 Apr '06

05 Apr '06

Hi, I have this parser that parses string that represents a function, (a c++ function prototype to say) CONSIDER: bool parse_info<> x_parser4(char const* str, FunctionSpec& spec) { // some rules... rettype = lexeme_d[ (alpha_p) >> *(alnum_p | space_p | ch_p('*')) ][list_actor(spec)]; // assign function name when match... function = lexeme_d[ (alpha_p | ch_p('_')) >> *(alnum_p | ch_p('_')) ][assign_a(spec.m_Name)]; // other rules.... .... return parse(str,top); } // Here's what my struct looks like: struct FunctionSpec { std::string m_Name; enum eVarType { VAR_VOID, VAR_BOOL, VAR_INT... } eVarType m_RetType; }; In the function rule what i did was just to assign the name to the m_Name of spec In the rettype tule what i did there was to pass the match string along with the struct (spec) to a class (list_actor) using the operator()... Problem is that i can't jsut assign m_RetType to the 'matched string' delivered to list_actor's operator() since this one is an enumerated type; In the code i attached, there is a function that 'maps' a string to eVarType, but i can't call this function within the list_actor's operator() body? i.e. template <typename ActionIterT> operator(...,...) { // can't do here? // tried to bind the function but it didn't work as well... } In summary what i need to do is to assign value for m_RetType and other members of FunctionSpec using the strings i get from parsing, e.g. when i get the string "void" for a match in the rettype rule, m_RetType will be assigned to VAR_VOID. etc. ----- krby

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Failed installing on VC8. Namespace 'boost' not found.
by �� 05 Apr '06

05 Apr '06

Hi. I'm newbie in C++ and i can't install the Boost library. Maybe i'm just doing somethng wrong ? Hepl plz. I have have A Visual Studio 2005 installed into default location. I have python 2.4.3 installed at default location (c:\Python24) => trying to install boost : I'm launching bjam.exe as bjam "-sTOOLS=vc-8_0" install it produces 168 files in c:\boost\lib with total size ~1Gig and produces the c:\Boost\include\boost-1_33_1\boost\ with .hpp's inside. //======================================= then setting VC++ Directorise in Tools>Options>Projects and Solutions in in VC++ 8.0 IDE - adding "c:\Boost\include" and "c:\Boost\include\boost-1_33_1\boost" to Include files - adding "c:\Boost\lib" Library files //======================================= then creating a simple VC++ console project and adding some using/include from examlles #include "stdafx.h" #include <boost/config.hpp> #include <iostream> #include <fstream> #include <boost/graph/graph_traits.hpp> #include <boost/graph/adjacency_list.hpp> #include <boost/graph/dijkstra_shortest_paths.hpp> using namespace boost; int _tmain(int argc, _TCHAR* argv[]) { return 0; } ==> Build == > fatal error C1083: Cannot open include file: 'boost/config.hpp': No such file or directory //================================================= Or in this manner : #include "stdafx.h" using namespace boost; int _tmain(int argc, _TCHAR* argv[]) { return 0; } ==> Build == > error C2871: 'boost' : a namespace with this name does not exist //============================== Any ideas how to make that thing work ?

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Re: [Boost-users] Failed installing on VC8. Namespace 'boost' not found
by Alex Korban 04 Apr '06

04 Apr '06

Hi Just a note about Vinzenz's advice: make sure you don't put the trailing slash into the include path, otherwise Visual Studio might produce weird and seemingly unrelated errors. E.g. put c:\Boost\include\boost-1_33_1 into the include paths, not c:\Boost\include\boost-1_33_1\ Hope this helps. Regards Alex Korban.

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Re: [Boost-users] Idea for equation library
by Sohail Somani 04 Apr '06

04 Apr '06

> -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of > Stephen Gross > Is it > worthwhile for me to post the toolkit code on this group? Heck yes.

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