April 2009 - Boost-users - lists.preview.boost.org

[serialization] deriving from xml_iarchive
by Kenny Riddile 20 Apr '09

20 Apr '09

I have a situation where I want an additional piece of data to be owned by the archive type we're using. Previously, I had this typedef that's used throughout our code: typedef boost::archive::xml_iarchive IutputArchive; I changed it to something like this: class InputArchive : public boost::archive::xml_iarchive { public: InputArchive( std::istream& is, Foo bar ) : boost::archive::xml_iarchive( is ) , m_bar( bar ) Foo GetFoo() const { return m_bar; } private: Foo m_bar; }; The problem I'm seeing is that whenever a serializable class's serialize() method is invoked via an InputArchive object, the template parameter to serialize() is instantiated with boost::archive::xml_iarchive, not InputArchive, which I need. Is it possible to get the behavior I want through public derivation like this, or is there a better way?

4 11

who uses ASIO
by suresh k 20 Apr '09

20 Apr '09

hi , I'm not sure if this is the right forum to ask this question, so pls redirect or ignore this mail. Do we have any information on any popular/network-intensive software which uses Boost ASIO ? Is this published any where ? thanks, - Suresh

3 2

[graph] hash_setS
by liquid 20 Apr '09

20 Apr '09

How to use hash_setS in adjacent_list? If I define BOOST_HAS_HASH the compiler will generate "error C2977: 'stdext::hash_set' : too many template arguments". This is caused by using "BOOST_STD_EXTENSION_NAMESPACE::hash_set<Key,Eq,Hash,Alloc>" in definition of "template <class Key, class Eq, class Hash, class Alloc> struct container_traits< BOOST_STD_EXTENSION_NAMESPACE::hash_set<Key,Eq,Hash,Alloc> > { typedef set_tag category; typedef stable_tag iterator_stability; // is this right? };" Class hash_set is defined in STL as follows: template<class _Kty, class _Tr = hash_compare<_Kty, _STD less<_Kty> >, class _Alloc = _STD allocator<_Kty> > class hash_set : public _Hash<_Hset_traits<_Kty, _Tr, _Alloc, false> > {...}; which has only 3 params. I'm using VS2008 Regards liquid

2 1

How to perform the VeecoFTC test, Thanks:)
by francisleetang 20 Apr '09

20 Apr '09

Hi, all, I am a new guy to Boost. I try to perform the regression test on WINCE and I found the VeecoFTC on http://www.boost.org/development/tests/trunk/developer/summary.html. But after 3 days' try and google the message about this test, I cannot perform the test on my machine. Can anybody help me? Thanks! Note: I change the msvc9.0 in VeecoFTC to msvc8.0 because I only installed the msvc8.0 on my machine. The information below is how I perform the test. 1. run on the command line: python run.py --runner=VeecoFTC --timeout=30 --user=anonymous --incremental --bjam-toolset=vc8 --pjl-toolset=msvc --toolsets=msvc/toolset-msvc:version=8.0~wm5~stlport5.2/stdlib=stlport-5.2~evc8~arm,msvc/toolset-msvc:version=8.0~stlport5.2/stdlib=stlport-5.2~vc8 The test failed 2. Add the user-config.jam part found in VeecoFTC page to C:\VeecoFTC\boost\tools\build\v2\user-config.jam 3. Follow the user-config.jam, I make a directory C:\VeecoFTC\boost\TestTools, and found the "WM5TestLauncher" source code, build it and placed it to C:\VeecoFTC\boost\TestTools. 4. Found the VSVars32-VC8-WM5.bat on web and placed it to C:\VeecoFTC\boost\TestTools. 5. run command in step 1 with option "--have-source" again. The test still failed with the messages below: # Making "C:\VeecoFTC\results" directory... # Starting tests ("C:\VeecoFTC\tools_bjam\bin.ntx86\bjam.exe" "-sBOOST_BUILD_PATH=C:\VeecoFTC;C:\VeecoFTC\tools_bb" "- OOST_ROOT=C:\VeecoFTC\boost" "--boost=C:\VeecoFTC\boost" "--boost-build=C:\VeecoFTC\tools_bb" "--debug-configuration" l1800 msvc/toolset-msvc:version=8.0~wm5~stlport5.2/stdlib=stlport-5.2~evc8~arm msvc/toolset-msvc:version=8.0~stlport5. stdlib=stlport-5.2~vc8 -d2 preserve-test-targets=off --dump-tests "--build-dir=C:\VeecoFTC\results" >>"C:\VeecoFTC\re lts\bjam.log" 2>&1)... C:\VeecoFTC\boost\status>"C:\VeecoFTC\tools_bjam\bin.ntx86\bjam.exe" "-sBOOST_BUILD_PATH=C:\VeecoFTC;C:\VeecoFTC\tools b" "-sBOOST_ROOT=C:\VeecoFTC\boost" "--boost=C:\VeecoFTC\boost" "--boost-build=C:\VeecoFTC\tools_bb" "--debug-configur ion" -l1800 msvc/toolset-msvc:version=8.0~wm5~stlport5.2/stdlib=stlport-5.2~evc8~arm msvc/toolset-msvc:version=8.0~st ort5.2/stdlib=stlport-5.2~vc8 -d2 preserve-test-targets=off --dump-tests "--build-dir=C:\VeecoFTC\results" 1>>"C:\Ve oFTC\results\bjam.log" 2>&1 # Running Boost.Build tests Traceback (most recent call last): File "C:\VeecoFTC\run.py", line 60, in <module> runner(root) File "C:\VeecoFTC\tools_regression_src\regression.py", line 193, in __init__ self.main() File "C:\VeecoFTC\tools_regression_src\regression.py", line 551, in main getattr(self,action_m)() File "C:\VeecoFTC\tools_regression_src\regression.py", line 516, in command_regression self.command_test() File "C:\VeecoFTC\tools_regression_src\regression.py", line 317, in command_test self.command_test_boost_build() File "C:\VeecoFTC\tools_regression_src\regression.py", line 354, in command_test_boost_build "boost/bin.v2/libs/any/test/any_test.test")); WindowsError: [Error 3] The system cannot find the path specified: 'C:\\VeecoFTC\\results\\boost/bin.v2/libs/any/test/ y_test.test/*.*' The attachments are the key configure files and error logs on my machine. Best Regards, Francis

1 0

BGL:add vertex and edge to subgraph
by Alice.gugu 20 Apr '09

20 Apr '09

Hi, I want to generate a local spanning tree of one graph(not MST) so I construct a subgraph of the original graph by add_vertex() and add_edge() function. The problem is that after the add_vertex(). the local tree generate edges between the vertexes automaticlly. If I call add_edge() again, it will dumplicat edges since all the edges between existing vertex have been added by add_vertex() function. I checked the example code of how to add vertex and edge in subgraph. It seems the add_vertex() function should not add edges automaticlly. SUBGRAPH m_g; ... //Create spanning tree SUBGRAPH& localTree = m_g.create_subgraph(); //Add one vertex as root in spanning tree boost::add_vertex(m_root, localTree); //Add descendants to the tree typedef graph_traits<SUBGRAPH> GTraits; GTraits::out_edge_iterator tmpei, tmpei_end; std::pair<GTraits::out_edge_iterator, GTraits::out_edge_iterator> p; p = out_edges(m_root, m_g); tmpei = p.first; tmpei_end = p.second; while ( tmpei != tmpei_end ) { //Descendant PolyGraphVertex tmpv = target(*tmpei , m_g); //Add descendant boost::add_vertex(tmpv, localTree); //Add an edge from ancestor to descendant boost::add_edge(m_root,tmpv,localTree); tmpei++; }

1 0

Boost python refuses to compile on OSX
by Pim Schellart 19 Apr '09

19 Apr '09

Dear Users/Developers, I followed the instructions on http://www.boost.org/doc/libs/1_38_0/libs/python/doc/building.html to install and build the boost python library. When running the command bjam toolset=gcc --verbose-test test from the /usr/local/boost_1_38_0/libs/python/example/quickstart directory I get the following output (a bit long I know :)): ...patience... ...patience... ...found 1356 targets... ...updating 54 targets... common.mkdir bin common.mkdir bin/test_ext.test common.mkdir bin/test_ext.test/gcc-4.0.1 common.mkdir bin/test_ext.test/gcc-4.0.1/debug common.mkdir bin/gcc-4.0.1 common.mkdir bin/gcc-4.0.1/debug gcc.compile.c++ bin/gcc-4.0.1/debug/extending.o common.mkdir ../../../../bin.v2 common.mkdir ../../../../bin.v2/libs common.mkdir ../../../../bin.v2/libs/python common.mkdir ../../../../bin.v2/libs/python/build common.mkdir ../../../../bin.v2/libs/python/build/gcc-4.0.1 common.mkdir ../../../../bin.v2/libs/python/build/gcc-4.0.1/debug gcc.compile.c++ ../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ numeric.o gcc.compile.c++ ../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ list.o gcc.compile.c++ ../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ long.o gcc.compile.c++ ../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ dict.o gcc.compile.c++ ../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ tuple.o gcc.compile.c++ ../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ str.o ../../../../libs/python/src/str.cpp: In function ‘boost::python::ssize_t boost::python::detail::<unnamed>::str_size_as_py_ssize_t(size_t)’: ../../../../libs/python/src/str.cpp:29: warning: comparison between signed and unsigned integer expressions gcc.compile.c++ ../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ slice.o common.mkdir ../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ converter gcc.compile.c++ ../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ converter/from_python.o gcc.compile.c++ ../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ converter/registry.o gcc.compile.c++ ../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ converter/type_id.o common.mkdir ../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/object gcc.compile.c++ ../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ object/enum.o gcc.compile.c++ ../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ object/class.o ../../../../libs/python/src/object/class.cpp: In function ‘boost::python::api::object boost::python::objects::<unnamed>::new_class(const char*, size_t, const boost::python::type_info*, const char*)’: ../../../../libs/python/src/object/class.cpp:510: warning: comparison between signed and unsigned integer expressions gcc.compile.c++ ../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ object/function.o ../../../../libs/python/src/object/function.cpp: In member function ‘PyObject* boost::python::objects::function::call(PyObject*, PyObject*) const’: ../../../../libs/python/src/object/function.cpp:169: warning: comparison between signed and unsigned integer expressions gcc.compile.c++ ../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ object/inheritance.o gcc.compile.c++ ../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ object/life_support.o gcc.compile.c++ ../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ object/pickle_support.o gcc.compile.c++ ../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ errors.o gcc.compile.c++ ../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ module.o gcc.compile.c++ ../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ converter/builtin_converters.o gcc.compile.c++ ../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ converter/arg_to_python_base.o gcc.compile.c++ ../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ object/iterator.o gcc.compile.c++ ../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ object/stl_iterator.o gcc.compile.c++ ../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ object_protocol.o gcc.compile.c++ ../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ object_operators.o gcc.compile.c++ ../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ wrapper.o gcc.compile.c++ ../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ import.o gcc.compile.c++ ../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ exec.o gcc.compile.c++ ../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ object/function_doc_signature.o gcc.link.dll ../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ libboost_python-gcc40-d-1_38.dylib ld: unknown option: -R collect2: ld returned 1 exit status "g++" -L"/Applications/scisoft/i386/Packages/Python-2.5.2/ Python.framework/Versions/2.5/lib" -L"/Applications/scisoft/i386/ Packages/Python-2.5.2/Python.framework/Versions/2.5/lib/python2.5/ config" -Wl,-R -Wl,"/Applications/scisoft/i386/Packages/Python-2.5.2/ Python.framework/Versions/2.5/lib" -Wl,-R -Wl,"/Applications/scisoft/ i386/Packages/Python-2.5.2/Python.framework/Versions/2.5/lib/python2.5/ config" -o "../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ libboost_python-gcc40-d-1_38.dylib" -Wl,-h -Wl,libboost_python-gcc40- d-1_38.dylib -shared -Wl,--start-group "../../../../bin.v2/libs/python/ build/gcc-4.0.1/debug/numeric.o" "../../../../bin.v2/libs/python/build/ gcc-4.0.1/debug/list.o" "../../../../bin.v2/libs/python/build/ gcc-4.0.1/debug/long.o" "../../../../bin.v2/libs/python/build/ gcc-4.0.1/debug/dict.o" "../../../../bin.v2/libs/python/build/ gcc-4.0.1/debug/tuple.o" "../../../../bin.v2/libs/python/build/ gcc-4.0.1/debug/str.o" "../../../../bin.v2/libs/python/build/gcc-4.0.1/ debug/slice.o" "../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ converter/from_python.o" "../../../../bin.v2/libs/python/build/ gcc-4.0.1/debug/converter/registry.o" "../../../../bin.v2/libs/python/ build/gcc-4.0.1/debug/converter/type_id.o" "../../../../bin.v2/libs/ python/build/gcc-4.0.1/debug/object/enum.o" "../../../../bin.v2/libs/ python/build/gcc-4.0.1/debug/object/class.o" "../../../../bin.v2/libs/ python/build/gcc-4.0.1/debug/object/function.o" "../../../../bin.v2/ libs/python/build/gcc-4.0.1/debug/object/inheritance.o" "../../../../ bin.v2/libs/python/build/gcc-4.0.1/debug/object/life_support.o" "../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/object/ pickle_support.o" "../../../../bin.v2/libs/python/build/gcc-4.0.1/ debug/errors.o" "../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ module.o" "../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ converter/builtin_converters.o" "../../../../bin.v2/libs/python/build/ gcc-4.0.1/debug/converter/arg_to_python_base.o" "../../../../bin.v2/ libs/python/build/gcc-4.0.1/debug/object/iterator.o" "../../../../ bin.v2/libs/python/build/gcc-4.0.1/debug/object/stl_iterator.o" "../../../../bin.v2/libs/python/build/gcc-4.0.1/debug/ object_protocol.o" "../../../../bin.v2/libs/python/build/gcc-4.0.1/ debug/object_operators.o" "../../../../bin.v2/libs/python/build/ gcc-4.0.1/debug/wrapper.o" "../../../../bin.v2/libs/python/build/ gcc-4.0.1/debug/import.o" "../../../../bin.v2/libs/python/build/ gcc-4.0.1/debug/exec.o" "../../../../bin.v2/libs/python/build/ gcc-4.0.1/debug/object/function_doc_signature.o" -Wl,-Bstatic -Wl,- Bdynamic -lpython2.5 -Wl,--end-group -g ...failed gcc.link.dll ../../../../bin.v2/libs/python/build/gcc-4.0.1/ debug/libboost_python-gcc40-d-1_38.dylib... ...skipped <pbin/gcc-4.0.1/debug>extending.so for lack of <p../../../../bin.v2/libs/python/build/gcc-4.0.1/debug>libboost_python- gcc40-d-1_38.dylib... ...skipped <pbin/test_ext.test/gcc-4.0.1/debug>test_ext for lack of <pbin/gcc-4.0.1/debug>extending.so... common.mkdir bin/test_embed.test common.mkdir bin/test_embed.test/gcc-4.0.1 common.mkdir bin/test_embed.test/gcc-4.0.1/debug gcc.compile.c++ bin/gcc-4.0.1/debug/embedding.o ...skipped <pbin/gcc-4.0.1/debug>embedding for lack of <p../../../../ bin.v2/libs/python/build/gcc-4.0.1/debug>libboost_python-gcc40- d-1_38.dylib... ...skipped <pbin/test_embed.test/gcc-4.0.1/debug>test_embed.run for lack of <pbin/gcc-4.0.1/debug>embedding... ...failed updating 1 target... ...skipped 6 targets... ...updated 47 targets... The test does not run automatically but if I try to run it manually I get: python test_extending.py Trying: from extending import * Expecting nothing ********************************************************************** File "/usr/local/boost_1_38_0/libs/python/example/quickstart/ test_extending.py", line 6, in test_extending Failed example: from extending import * Exception raised: Traceback (most recent call last): File "/Applications/scisoft/i386/Packages/Python-2.5.2/ Python.framework/Versions/2.5/lib/python2.5/doctest.py", line 1228, in __run compileflags, 1) in test.globs File "<doctest test_extending[0]>", line 1, in <module> from extending import * ImportError: No module named extending Trying: hi = hello('California') Expecting nothing ********************************************************************** File "/usr/local/boost_1_38_0/libs/python/example/quickstart/ test_extending.py", line 7, in test_extending Failed example: hi = hello('California') Exception raised: Traceback (most recent call last): File "/Applications/scisoft/i386/Packages/Python-2.5.2/ Python.framework/Versions/2.5/lib/python2.5/doctest.py", line 1228, in __run compileflags, 1) in test.globs File "<doctest test_extending[1]>", line 1, in <module> hi = hello('California') NameError: name 'hello' is not defined Trying: hi.greet() Expecting: 'Hello from California' ********************************************************************** File "/usr/local/boost_1_38_0/libs/python/example/quickstart/ test_extending.py", line 8, in test_extending Failed example: hi.greet() Exception raised: Traceback (most recent call last): File "/ Applications/scisoft/i386/Packages/Python-2.5.2/Python.framework/ Versions/2.5/lib/python2.5/doctest.py", line 1228, in __run compileflags, 1) in test.globs File "<doctest test_extending[2]>", line 1, in <module> hi.greet() NameError: name 'hi' is not defined Trying: invite(hi) Expecting: 'Hello from California! Please come soon!' ********************************************************************** File "/usr/local/boost_1_38_0/libs/python/example/quickstart/ test_extending.py", line 10, in test_extending Failed example: invite(hi) Exception raised: Traceback (most recent call last): File "/ Applications/scisoft/i386/Packages/Python-2.5.2/Python.framework/ Versions/2.5/lib/python2.5/doctest.py", line 1228, in __run compileflags, 1) in test.globs File "<doctest test_extending[3]>", line 1, in <module> invite(hi) NameError: name 'invite' is not defined Trying: hi.invite() Expecting: 'Hello from California! Please come soon!' ********************************************************************** File "/usr/local/boost_1_38_0/libs/python/example/quickstart/ test_extending.py", line 12, in test_extending Failed example: hi.invite() Exception raised: Traceback (most recent call last): File "/Applications/scisoft/i386/Packages/Python-2.5.2/Python.framework/ Versions/2.5/lib/python2.5/doctest.py", line 1228, in __run compileflags, 1) in test.globs File "<doctest test_extending[4]>", line 1, in <module> hi.invite() NameError: name 'hi' is not defined Trying: class wordy(hello): def greet(self): return hello.greet(self) + ', where the weather is fine' Expecting nothing ********************************************************************** File "/usr/local/boost_1_38_0/libs/python/example/quickstart/ test_extending.py", line 15, in test_extending Failed example: class wordy(hello): def greet(self): return hello.greet(self) + ', where the weather is fine' Exception raised: Traceback (most recent call last): File "/Applications/scisoft/i386/Packages/Python-2.5.2/ Python.framework/Versions/2.5/lib/python2.5/doctest.py", line 1228, in __run compileflags, 1) in test.globs File "<doctest test_extending[5]>", line 1, in <module> class wordy(hello): NameError: name 'hello' is not defined Trying: hi2 = wordy('Florida') Expecting nothing ********************************************************************** File "/usr/local/boost_1_38_0/libs/python/example/quickstart/ test_extending.py", line 19, in test_extending Failed example: hi2 = wordy('Florida') Exception raised: Traceback (most recent call last): File "/Applications/scisoft/i386/Packages/Python-2.5.2/ Python.framework/Versions/2.5/lib/python2.5/doctest.py", line 1228, in __run compileflags, 1) in test.globs File "<doctest test_extending[6]>", line 1, in <module> hi2 = wordy('Florida') NameError: name 'wordy' is not defined Trying: hi2.greet() Expecting: 'Hello from Florida, where the weather is fine' ********************************************************************** File "/usr/local/boost_1_38_0/libs/python/example/quickstart/ test_extending.py", line 20, in test_extending Failed example: hi2.greet() Exception raised: Traceback (most recent call last): File "/Applications/scisoft/i386/Packages/Python-2.5.2/Python.framework/ Versions/2.5/lib/python2.5/doctest.py", line 1228, in __run compileflags, 1) in test.globs File "<doctest test_extending[7]>", line 1, in <module> hi2.greet() NameError: name 'hi2' is not defined Trying: invite(hi2) Expecting: 'Hello from Florida! Please come soon!' ********************************************************************** File "/usr/local/boost_1_38_0/libs/python/example/quickstart/ test_extending.py", line 22, in test_extending Failed example: invite(hi2) Exception raised: Traceback (most recent call last): File "/Applications/scisoft/i386/Packages/Python-2.5.2/Python.framework/ Versions/2.5/lib/python2.5/doctest.py", line 1228, in __run compileflags, 1) in test.globs File "<doctest test_extending[8]>", line 1, in <module> invite(hi2) NameError: name 'invite' is not defined 1 items had no tests: test_extending.run ********************************************************************** 1 items had failures: 9 of 9 in test_extending 9 tests in 2 items. 0 passed and 9 failed. ***Test Failed*** 9 failures. Does anyone have any idea what is going wrong? Kind regards, Pim Schellart

2 1

MPI auto-detection failed: unknown wrapper compiler mpic++
by wuguangjun 19 Apr '09

19 Apr '09

Hello boost-users, I install boost_1-38 in centOS5.3. with following command; ./configure -with-libraries=all Then I add "using mpi ;" into user-configure.jam, when I make the MakeFile ,an error occur, ./tools/jam/src/bin.linuxx86/bjam --user-config=user-config.jam MPI auto-detection failed: unknown wrapper compiler mpic++ Please report this error to the Boost mailing list: http://www.boost.org You will need to manually configure MPI support. warning: Graph library does not contain optional GraphML reader. note: to enable GraphML support, set EXPAT_INCLUDE and EXPAT_LIBPATH to the note: directories containing the Expat headers and libraries, respectively. warning: skipping optional Message Passing Interface (MPI) library. note: to enable MPI support, add "using mpi ;" to user-config.jam. note: to suppress this message, pass "--without-mpi" to bjam. note: otherwise, you can safely ignore this message. Building Boost.Regex with the optional Unicode/ICU support disabled. Note: Please refer to the Boost.Regex documentation for more information Note: this is a strictly optional feature. Is there something wrong? 2009-04-17 wuguangjun

3 3

multi-type containers
by László Marák 19 Apr '09

19 Apr '09

Dear Boost Users, I am getting started with boost.python. I want to port an image processing library into python. My problem is, that I have several pixel types (like int, float, etc.) which I'd love to handle in the same object by downcasting. In c++ it's something like this: class image {}; class float_image : image { float * pixels; // or boost::array_ptr<float> } class int_image : image { int * pixels; // or boost::array_ptr<int> } I can create the image object by: image * A = new float_image() image * B = new int_image() Now I'd have a virtual functions virtual float image::get_element() virtual int image::get_element() obviously this won't pass in c++, but in python it should pose no difficulty, as python uses dynamic casting. Is there a manner to do this with c++/boost/python? thank you for considering, Laszlo

2 1

installing Windows x64
by John Dlugosz 19 Apr '09

19 Apr '09

The boost-pro installer for Windows didn't download any x64 versions. Is there a different way to get that? TradeStation Group, Inc. is a publicly-traded holding company (NASDAQ GS: TRAD) of three operating subsidiaries, TradeStation Securities, Inc. (Member NYSE, FINRA, SIPC and NFA), TradeStation Technologies, Inc., a trading software and subscription company, and TradeStation Europe Limited, a United Kingdom, FSA-authorized introducing brokerage firm. None of these companies provides trading or investment advice, recommendations or endorsements of any kind. The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from any computer.

2 1

[interprocess]message_queue in Windows service
by Laurence Chambenois 18 Apr '09

18 Apr '09

Hi, I write a Windows Service that answer to requests through a message_queue. The message queue is created by the service, and then by the user starting the service (local system account). When another application, launched by another user, wants to connect to the message queue, it cannot. Because the mapped file is not in the same temporary directory. My question is : how can I do to create a message queue that can be accessed by any user ? Thanks for your help

2 1