March 2010 - Boost-users - lists.preview.boost.org

[date time] convert UTC date-time to run-time-determined local time zone
by eburkitt＠gmail.com 17 Mar '10

17 Mar '10

I'm developing a program that will perform tasks on behalf of clients in various (US) time zones. It receives a UTC date-time from the client, along with an offset from UTC and a flag as to whether the client's area observes DST. The program needs to convert the time into both its own local time and the client's local time. I have not been able to come up with a reasonable way to do either in the date-time library. The only way I can find in the library to convert UTC to local time requires me to know the time zone at compile time. For the client I have the offset from UTC and its local DST observance policy. (I can stipulate at this point that the client uses US DST rules.) For the program itself, I have only what I can query from the computer on which it runs. Am I missing something obvious?

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Re: [Boost-users] How to forward to a list of boost::function?
by OvermindDL1 17 Mar '10

17 Mar '10

-----Original Message----- From: John Ky <newhoggy(a)gmail.com> Sent: Tuesday, March 16, 2010 5:29 AM To: boost-users <boost-users(a)lists.boost.org> Subject: Re: [Boost-users] How to forward to a list of boost::function? > > Hi OvermindDL1, > > I'm having trouble finding any information on this (or some of the other alternatives presented here). For example, the following page: > > http://www.boost.org/doc/libs/1_42_0/libs/fusion/doc/html/fusion/functional… > > links to a broken link: > > http://www.boost.org/doc/libs/1_42_0/libs/functional/forward/doc/html/index… > > Anywhere I can get to the documentation on this? The work was started in 1.42, however it is finished in the trunk. Look at the functional docs on the trunk and they exist there and all code there works well. Sorry that I cannot supply actual links, not at computer (am on my phone currently).

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How to pass parameters to manage_shared_memory.construct() in Boost.Interprocess
by Cuneyt Taskiran 16 Mar '10

16 Mar '10

I've stared at the Boost.Interprocess documentation for hours but still haven't been able to figure this out. In the doc, they have of creating a vector in shared memory like so: //Define an STL compatible allocator of ints that allocates from the managed_shared_memory. //This allocator will allow placing containers in the segment typedef allocator<int, managed_shared_memory::segment_manager> ShmemAllocator; //Alias a vector that uses the previous STL-like allocator so that allocates //its values from the segment typedef vector<int, ShmemAllocator> MyVector; int main(int argc, char *argv[]) { //Create a new segment with given name and size managed_shared_memory segment(create_only, "MySharedMemory", 65536); //Initialize shared memory STL-compatible allocator const ShmemAllocator alloc_inst (segment.get_segment_manager()); //Construct a vector named "MyVector" in shared memory with argument alloc_inst MyVector *myvector = segment.construct<MyVector>("MyVector")(alloc_inst); Now, I understand this. What I'm stuck is how to pass a second parameter to `segment.construct()` to specify the number of elements. The interprocess document gives the prototype for `construct()` as MyType *ptr = managed_memory_segment.construct<MyType>("Name") (par1, par2...); but when I try MyVector *myvector = segment.construct<MyVector>("MyVector")(100, alloc_inst); I get compilation errors. My questions are: 1. Who actually gets passed the parameters `par1, par2` from `segment.construct`, the constructor of the object, e.g. `vector`? My understanding is that the template allocator parameter is being passed. Is that correct? 2. How can I add another parameter, in addition to `alloc_inst` that is required by the constructor of the object being created in shared memory? Thanks!

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[serialization] polymorphic portable binary example not working.
by Mostafa 16 Mar '10

16 Mar '10

Hi all, Can someone please shed some light on this. I'm trying to compile the polymorphic portable binary serializor in the examples directory and getting compiler errors. Some I managed to fix because a file seemed to have been deleted and its class moved to another file, but this one has stumped me. In polymorphic_portable_binary_oarchive.hpp, its complaining about: #include <boost/archive/detail/polymorphic_oarchive_dispatch.hpp> which is needed for: typedef boost::archive::detail::polymorphic_oarchive_dispatch< portable_binary_oarchive > polymorphic_portable_binary_oarchive; Obviously polymorphic_oarchive_dispatch.hpp is missing and there isn't a class definition for polymorphic_oarchive_dispatch in any other files. (I've downloaded the boost source code so I'm not relying on any packages.) Any help on how to resolve this would be appreciated. Thanks, Mostafa

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scatter error
by alev mutlu 16 Mar '10

16 Mar '10

Hi The code below compiles fine , but gives the [ceng1:23288] *** Process received signal *** [ceng1:23288] Signal: Segmentation fault (11) [ceng1:23288] Signal code: Address not mapped (1) [ceng1:23288] Failing at address: 0xfffffffffffffff9 [ceng1:23288] [ 0] /lib64/libpthread.so.0 [0x3baf40de80] [ceng1:23288] [ 1] /usr/lib64/libstdc++.so.6(_ZN9__gnu_cxx18__exchange_and_addEPVii+0x2) [0x38d9cb7672] [ceng1:23288] [ 2] /usr/lib64/libstdc++.so.6(_ZNSs6assignERKSs+0x9b) [0x38d9c9ca4b] [ceng1:23288] [ 3] test-boost(_ZN5fieldaSERKS_+0x47) [0x4219a1] [ceng1:23288] [ 4] test-boost(_ZNSt6__copyILb0ESt26random_access_iterator_tagE4copyIPK5fieldPS3_EET0_T_S8_S7_+0x3c) [0x4221e0] [ceng1:23288] [ 5] test-boost(_ZSt10__copy_auxIPK5fieldPS0_ET0_T_S5_S4_+0x29) [0x422225] [ceng1:23288] [ 6] test-boost(_ZNSt13__copy_normalILb0ELb0EE6copy_nIPK5fieldPS2_EET0_T_S7_S6_+0x25) [0x42224d] [ceng1:23288] [ 7] test-boost(_ZSt4copyIPK5fieldPS0_ET0_T_S5_S4_+0x2d) [0x42227d] [ceng1:23288] [ 8] test-boost(_ZN5boost3mpi6detail12scatter_implI5fieldEEvRKNS0_12communicatorEPKT_PS7_iiN4mpl_5bool_ILb0EEE+0x90) [0x42a652] [ceng1:23288] [ 9] test-boost(_ZN5boost3mpi7scatterI5fieldEEvRKNS0_12communicatorEPKT_PS6_ii+0x50) [0x42b184] [ceng1:23288] [10] test-boost(_ZN5boost3mpi7scatterI5fieldEEvRKNS0_12communicatorERKSt6vectorIT_SaIS7_EEPS7_ii+0x55) [0x42b1fd] [ceng1:23288] [11] test-boost(main+0x231) [0x4208a3] [ceng1:23288] [12] /lib64/libc.so.6(__libc_start_main+0xf4) [0x3bae81d8b4] [ceng1:23288] [13] test-boost(__gxx_personality_v0+0x169) [0x420489] [ceng1:23288] *** End of error message *** mpirun noticed that job rank 0 with PID 23288 on node ceng1-ib exited on signal 11 (Segmentation fault). run time errors. Is this due to miss-use of boost functions or am I doing wrong with memory allocation? #include <boost/mpi/environment.hpp> #include <boost/mpi/communicator.hpp> #include <boost/mpi/collectives.hpp> #include <boost/thread/barrier.hpp> #include <boost/thread/mutex.hpp> #include <boost/config.hpp> #include <boost/archive/text_oarchive.hpp> #include <boost/archive/text_iarchive.hpp> #include <boost/serialization/access.hpp> #include <boost/serialization/string.hpp> #include <string> #include <iostream> #include <vector> #include <fstream> #define MASTER 0 int arraySize = 7; using namespace std; namespace mpi = boost::mpi; struct field { string field_name; string field_type; string field_ref; string field_colType; }; namespace boost { namespace serialization{ template<class Archive> void serialize(Archive & ar, struct field & f, unsigned int version){ ar & f.field_name; ar & f.field_type; ar & f.field_ref; ar & f.field_colType; } } } int main(int argc, char* argv[]) { mpi::environment env(argc, argv); mpi::communicator world; int m_mySize, w_mySize, kk,i; struct field *relAllValues; struct field *relMyValues; vector<struct field> C; struct field c; w_mySize = arraySize / world.size(); cout << "w_mySize = " << w_mySize << endl; if (world.rank() == MASTER){ for(int i = 0; i < arraySize; i++){ c.field_name = "field_name=" + i; c.field_type = "field_type=" + i; c.field_ref = "field_ref=" + i; c.field_colType = "field_colType=" + i; C.push_back(c); } m_mySize = arraySize / world.size() + arraySize % world.size(); relMyValues = (struct field *) malloc(sizeof(struct field) * m_mySize); relAllValues = (struct field *) malloc(sizeof(struct field) * arraySize); } else{ relMyValues = (struct field *) malloc(sizeof(struct field) * w_mySize); } if (world.rank() == MASTER){ scatter(world, C, relMyValues, w_mySize, 0); } else{ scatter(world, C, relMyValues, w_mySize, 0); } }

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regex - build problem
by Christian Meesters 16 Mar '10

16 Mar '10

Hi, I recently installed boost v1.42, everything seemed fine, but now I'm trying to use the regex-library -- and cannot compile/link my code anymore. gcc tells me that upon linking it cannot find 'libicudata.so.38', 'libicui18n.so.38', and 'libicuuc.so.38' and complaints about a number of undefined references. Indeed I have icu40 not 38 installed on my system. Just providing symbolic links with the appropriate names does not help. I then tried updating my boost build with bjam. But bjam also complaints (with ./bjam --with-regex toolset=gcc -sHAVE_ICU=1 -sICU_PATH=/usr/lib): warning! ICU configuration failed Couldn't find utypes.h in /usr/lib/include/unicode warning: Building Boost.Regex with the optional Unicode/ICU support disabled. There are no further warnings, yet linking still results in undefined references. 'utypes.h' is nowhere on my system and apparently does not come with the icu-dev package. I am running the current Ubuntu (9.10), all updates installed. boost ist compiled on my system, no package involved. And I'm using gcc 4.4 - if that matters. Now, could this be a versions issue? Any hint on where to look further? Any ideas? TIA Christian

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Compiling boost using Sun C++ 5.5
by Deane Yang 16 Mar '10

16 Mar '10

I'm trying to compile on a Solaris Sparc machine with Sun C++ 5.5 some C++ code that uses the boost string algorithms library. I've tried versions 1.37, 1.38, 1.39, and 1.42. With more recent versions, I get the following error: ../../boost/boost/cstdint.hpp", line 458: Error: #error defaults not correct; you must hand modify boost/cstdint.hpp. This seems like an error that I should be able to deal with, but I'm not sure what to do. Could someone offer me some guidance?

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[boost-users] [quickbook] '-' char instead of space in PDF document
by Andrey Torba 16 Mar '10

16 Mar '10

Hi all, I write my documentation using Boost.QuickBook. But there are '-' character instead of spaces In a generated PDF document in C++ code blocks . You can see it in the attached screenshot. How can i eliminate '-' chars. Thanks -- Regards, Andrey

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Building boost 1.42.0 for visual studio 2008 professional
by Boost lzw 16 Mar '10

16 Mar '10

Hello boost folks, I came across the following link on how to build Boost With Visual Studio: http://blog.emptycrate.com/node/414 I have VS2008 professional on Windows XP professional with boost 1.39.0 installed, really wanted to replace it with 1.42.0. My hard disk now has about 16 GB left. Is there anybody who followed the above link to have successfully installed boost 1.42.0 in an environment like mine (i.e., is the method correct)? What should I do with the /boost directory of about 1.8GB when boost 1.39.0 was built, simply deleting it? Thanks a lot in advance, Robert

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How to forward to a list of boost::function?
by John Ky 16 Mar '10

16 Mar '10

Hi all, I have a class: template<typename function_type> class function_vector { private: std::vector<boost::function<function_type> > functions; }; I want to write an operator() for this template class that takes all the arguments necessary to invoke a function of type function_type. When called, it should call each function in the functions field. How do I do this? I think Boost.Signals2 does something like this, but I can't work out how it is done. Cheers, -John

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