- Boost-users - lists.boost.org

Re: [Boost-users] Boost Spirit and C++/CLI
by Hansi Hansi 17 Oct '07

17 Oct '07

When you use windows forms programs you can't use the standard main entry point with mixed unmanaged code. There is a bug in the initialization of the CRT in VS2005. It seems that the bug is not anymore in VS2008. Test it with the entry point '?mainCRTStartupStrArray@@$$FYMHP$01AP$AAVString@System@@@Z' Best regards Hansjörg _______________________________________________________________________ Jetzt neu! Schützen Sie Ihren PC mit McAfee und WEB.DE. 3 Monate kostenlos testen. http://www.pc-sicherheit.web.de/startseite/?mc=022220

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boost::serialization(1.34.1) Can not link 64-bit example.
by Oleg Udovenko 16 Oct '07

16 Oct '07

Hi, Now I'm trying to use the "serialization" library on 64-bit(x64, Visual C++ 8.0). And faced some troubles with that. First I've converted a Visual Studio 2003 solution (vc7ide) to Visual Studio 2005, and compiled 64-bit static library release/debug. It passed the compilation with lots of warnings. But when I tried build a 64-bit example demo_xml_load.cpp I've got a lots of linker errors. - Is somebody tried the "serialization" library on 64-bit? Thanks, Oleg.

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What would happen if boost::shared_ptr is reset to an address in the stack
by Peng Yu 16 Oct '07

16 Oct '07

Hi, The following program runs well in my system. However, if I change 1 to 0, it will terminate at the line with "delete". Does this mean that boost::shared_ptr can tell if the pointer is from the stack or the heap and does different things based on where the pointer is from? Thanks, Peng #include <iostream> #include <boost/shared_ptr.hpp> int main() { #if 1//try change this to 0 int a[100]; boost::shared_ptr<int> p(a); std::cout << std::endl; #else int a[100]; delete a; // would terminate here std::cout << std::endl; #endif }

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[shared_ptr] class ... has pointer data members but does not override ...
by Klaus Backert 16 Oct '07

16 Oct '07

Hello, a Boost newbie question: Arch: PPC, OS: Mac OS X 10.4.10, Compiler: GCC 4.0.1 In a C++ dynamic library, I'm just developing, I have: #include <boost/shared_ptr.hpp> namespace MyNameSpace { typedef boost::shared_ptr<std::string> StringPtr; } I get the following warning: /usr/local/include/boost/shared_ptr.hpp: In instantiation of 'boost::shared_ptr<std::string>': /Volumes/blablabla/MyClass.cpp:81: instantiated from here /usr/local/include/boost/shared_ptr.hpp:131: warning: 'class boost::shared_ptr<std::string>' has pointer data members /usr/local/include/boost/shared_ptr.hpp:131: warning: but does not override 'boost::shared_ptr<std::string>(const boost::shared_ptr<std::string>&)' The incriminated line in MyClass.cpp is the second line here: __attribute__((visibility("default"))) MyNameSpace::StringPtr MyClass::myFunction() const { /* .......... */ } I have experienced the same with classes of my own instead of std::string, i.e. with typedef boost::shared_ptr<MyOtherClass> MyOtherClassPtr; etc. May be it's just me, but the boost documentation and Google don't help. Can I ignore the warnings or should I do something? Thanks in advance Klaus

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How to add a type to is_arithmetic
by Peng Yu 16 Oct '07

16 Oct '07

Hi, Suppose I define a class fixed_point as class fixed_point{ ....some operations are defined here private: int _integer_part; unsigned _fractional_part } I want is_arithmetic<fixed_point>::type to be true_ Of cause, I can partially specialize the template class as template <> struct is_arithmetic<fixed_point> { ... blah blah }; If I use the above approach, shall I put it into the namespace boost or not? Also, I'm wondering if there is any generic way to do this? Thanks, Peng

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[optional] documentation errors
by Edward Diener 16 Oct '07

16 Oct '07

In the 1.34.1 documentation for optional<T>, in the Synopsis section, it is currently written: -------------------------------------------------------------------------- template<class InPlaceFactory> explicit optional ( InPlaceFactory const& f ) ; template<class TypedInPlaceFactory> explicit optional ( TypedInPlaceFactory const& f ) ; AND template<class InPlaceFactory> optional& operator = ( InPlaceFactory const& f ) ; template<class TypedInPlaceFactory> optional& operator = ( TypedInPlaceFactory const& f ) ; -------------------------------------------------------------------------- Since InPlacefactory and TypedInPlacePlactory are actual classes, these should be: template<InPlaceFactory> explicit optional ( InPlaceFactory const& f ) ; template<TypedInPlaceFactory> explicit optional ( TypedInPlaceFactory const& f ) ; AND template<InPlaceFactory> optional& operator = ( InPlaceFactory const& f ) ; template<TypedInPlaceFactory> optional& operator = ( TypedInPlaceFactory const& f ) ; ------------------------------------------------------------------------- In the Detailed Semantics these are shown correctly.

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[fusion] subset view
by Chris Weed 16 Oct '07

16 Oct '07

Hi, I would like to make a subset view of the element in a tuple. It would, for example, give me a view into the first, third, and fifth element of the tuple. It isn't clear how to do this with the available views. Thanks, Chris

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[serialization]-- serialize binary data to a memory buffer?
by Rich Peters 16 Oct '07

16 Oct '07

I saw an example where boost serialized a text archive to a strstream for sending via a socket. I would like to do something similar, but for binary data. Is there a way to do the binary serialization to a memory buffer, and then send it elsewhere? It doesnt seem like strstream and boost::archive::binary_oarchive would mix correctly. I have also seen some discussion regarding a binary_iostreams library, but its doesnt look like that exists yet. thanks Rich

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Re: [Boost-users] [continued][boost::fusion v2 and xpressive] versioning conflicts...
by Ovanes Markarian 16 Oct '07

16 Oct '07

Eric, I changed the files. Should I zip them and post via mailinglist? Or should I submit them somewhere else? List of files which were changed: detail/core/linker.hpp detail/core/matcher/alternate_matcher.hpp detail/static/productions/alt_compilers.hpp detail/utility/any.hpp detail/utility/cons.hpp proto/op_base.hpp proto/proto_fwd.hpp xpressive.hpp One problem is that xpressive.hpp has info about boost version, but this is the mostly used file for inclusion. Therefore I believe this check fill fail even in boost 1.35: #if BOOST_VERSION >= 103500 # ifndef BOOST_XPRESSIVE_FUSION_V2 # define BOOST_XPRESSIVE_FUSION_V2 # endif //BOOST_XPRESSIVE_FUSION_V2 #endif //BOOST_VERSION I also executed your examples from the boost/lib directory and they produced in both cases same results. Your answer today is highly appreciated, since I will be on vacation from tomorrow on. thanks, Ovanes > On 9/24/07, Ovanes Markarian < om_boost(a)keywallet.com> wrote: > > > > Eric, > > > > sorry for the delay. I only now found some time to work on that issue: > > http://lists.boost.org/boost-users/2007/08/30120.php > > > > > > After analysing your post and investigation what's going on, I would > > like to write my opinion: > > > > changing xpressive_fwd.hpp or proto_fwd.will not help. > > > > I grepped where fusion includes are used and need to enclose these in > > some conditional statements: > > > > #ifdef BOOST_XPRESSIVE_FUSION_V2 > > # include ... //fusion 2 headers > > #else > > # include ... // fusion 1 headers > > #endif > > > > Actually this can be done using some kind of a macro function like: > > > > #include BOOST_XPRESSIVE_FUSION_ROOT(sequence/cons.hpp) > > ... > > > > The macro function will deliver the root dependent on the predefined > > macros like: > > 1. if !defined XPRESSIVE_FUSION_ROOT and use V2 > > => choose the root for V2 > > else => choose the root for V1 > > > > As I found out the following files need to be changed: > > linker.hpp > > alternate_matcher.hpp > > alt_compilers.hpp > > any.hpp > > cons.hpp > > arg_traits.hpp > > op_base.hpp > > proto_fwd.hpp > > > > If you give me your green light I will do it and submit a patch. > > > > > > With Kind Regards, > > Ovanes > > > > > >

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Problem using Boost Graph Library - Python Bindings
by Camilo La Rota 16 Oct '07

16 Oct '07

Hello all, I have just installed the Boost Graph Library - Python Bindings. Everything seemed to be ok, I can read a graph from the example "mst.dot" file and from my own ".dot" files, I can write them back to a file. However, when I try the example script (at the end of the following page: http://www.osl.iu.edu/~dgregor/bgl-python/) -------------------------------------------------------------------- import boost.graph as bgl # Load a graph from the GraphViz file 'mst.dot' graph = bgl.Graph.read_graphviz('mst.dot') # Convert the weight into floating-point values weight = graph.convert_property_map(graph.edge_properties['weight'], 'float') ... etc ------------------------------------------------------------------- it stops at the third line with the following error: ---------------------------------------------------------------------------- Traceback (most recent call last): File "<pyshell#17>", line 1, in <module> weight = graph.convert_property_map(graph.edge_properties['weight'],'float') KeyError: 'weight' ------------------------------------------------------------------------ I receive the same error message if I write only: graph.edge_properties['weight'] The content of the example mst.dot file is: -------------------------------------------------- graph G { A -- C [weight="1.0"] B -- D [weight="1.0"] B -- E [weight="2.0"] C -- B [weight="7.0"] C -- D [weight="3.0"] D -- E [weight="1.0"] E -- A [weight="1.0"] E -- B [weight="1.0"] } -------------------------------------------------- Does any one have any idea about the source of this error. Thanks a lot in advance, Camilo

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