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Property Tree - adding child nodes to a parent
by Jon Shuler 30 Jan '10

30 Jan '10

I am trying to build a property tree from hierarchy data in a database. I want to be able to add a child at a given node using something similar to: parentNode.add_child("child name", data_type). There is a add_child method but it expects the path to add the child at. I looked at the examples and did not see anything. Is this possible? Jon This e-mail message and any attachment(s) transmitted with it are intended only for the use of the recipient(s) named above.This message may be privileged and/or confidential. If you are not an intended recipient, you may not review, copy or distribute this message. If you have received this communication in error, please notify us immediately by e-mail and delete the original message.

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Re: [Boost-users] Detect specialized template function?
by Andrew Chinkoff 30 Jan '10

30 Jan '10

Hi, Daniel. This is your example: template <class T> void S::f() { if(g is specialized) // (1) callbacks_ready=true; // else wait for a callback object to be registered } At (1) the runtime detection is used, but "S:g()" was specialized at compile time. Templates are specialized and compiled at compile time, but not runtime. We can't write "if(g is specialized)" - it is impossible to realize it at runtime (and it is senseless). So let me to recommend you some books of H. Sutter and A. Alexandrescu. There are a lot of recommendations about templates, their specializations, overloads, static/dynamic polymorphisms and more. 1st book: [http://www.gotw.ca/publications/xc++s.htm] Pay attention to this chapter of the book: "Item 7: Why Not Specialize Function Templates?" 2nd book; "C++ Coding Standards: 101 Rules, Guidelines, and Best Practices" (authors H. Sutter and A. Alexandrescu) Pay attention to 64, 65, 66 and 67 chapters. I hope you will find some useful ideas about templates in these books. There are also Boost libraries targeted to realize static polymorphism: 1) http://www.boost.org/doc/libs/1_40_0?view=category_Generic 2) http://www.boost.org/doc/libs/1_40_0?view=category_Metaprogramming Best, Andrew. > Slightly OT, but I was hoping someone here might know the magic incantation > (which may involve a Boost library). > Given a template class such as > template <class T> > struct S > { > void f(); > void g() { T t(h()); cb(t) } > T & h(); > boost::function1<void, T &> cb; > }; > Is there a way to have S.f() behave differently depending on whether S.g() uses > the default definition or whether it is specialized for this particular type? > This detection needs to occur before S.g() is ever called. > For example, the mere existance of the specialization > template <> void S<int>::g() { ... } > should trigger special logic in S<int>::f(). > Thanks, > Daniel > P.S. The motivation for this is an attempt to retrofit a callback API that > allows specialization of S.g() or the registration of a boost::function that > gets called by the default S.g(). We need to disable callbacks until an actual > function is registered via either method. It is easy to dispatch on > registration of the boost::function; I don't know how to detect the > specialization.

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Boost 1.36.0 with Linux 64bits
by JongKwan Kim 29 Jan '10

29 Jan '10

Hi all, I would like to know if the boost 1.36.0 is working well with Linux 64 bits. If I want to compile with boost 1.36.0 and Linux 64 bits, how should I install the boost 1.36.0? Is it the same to 32 bits machine? Please, if someone knows that, let me know. Thanks,

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fusion sequences, type erasure across translation units
by Hicham Mouline 29 Jan '10

29 Jan '10

Hello, I have a .cpp file which a sort of top level driver. I have say 100 different struct param_i {...}; where 1<=i<=100 Each param_i is defined in a param_i.hpp and param_i.cpp invokes metafunctions to obtain typedef fusion< variant< vector<double>, triplet<double>, pair<double>, double>, variant<...>, ..., variant<...> > seq_i_t; this sequence type is visible only in the param_i.cpp, not the header file. Generation of this sequence is The size of these sequences = number of members of param_i. The toplevel driver and other .cpp need to move instances of these types around to other .cpp. To avoid having the compiler call the metafunctions for these middle translation units, but only at the generating .cpp and at the consuming .cpp, I created a tag struct fusion_seq_tag {}; typedef <typename Arg> struct make_fusion_seq_i { typedef <undefined> type; }; typedef <typename Arg> struct make_fusion_seq_tag { typedef typename make_fusion_seq_i<Arg>::type base_type; struct type : fusion_seq_tag, base_type { type(...) : base_type(...) {} }; }; return smart_ptr<fusion_seq_tag>( new make_fusion_seq_tag<...>::type ); // this was the generating .cpp The function returns smart_ptr<fusion_seq_tag> which can move around in other .cpp without any metaprogramming until reaching the consuming .cpp Is this type erasure? I don't know how I can get the actual type back in the consuming .cpp if I don't know the originator but if I know only the shape of the fusion sequence. How to dynamic cast the type back to its unerased type? If I know the originator .cpp then I would know the exact fusion sequence and therefore I would just dynamic_cast the fusion_seq_tag. Regards,

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[boost][task] task and fiber do not compile
by Kishalay Kundu 29 Jan '10

29 Jan '10

Hi Oliver, I have boost 1.41.0 installed. I have been trying to build boost-task and boost-fiber (I guess this is the pre-req for building boost-task). However when I do: "./bjam threading=multi --with-task", the compiler errors out with a long list of compiler errors. I have gcc 4.4.1 installed on my Fedore 11 system. Could you please let me know what I am doing wrong? Thank you. regards, Kishalay

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[BGL] Color Maps
by pablo barrio lópez-cortijo 29 Jan '10

29 Jan '10

Hi there! I'm new to Boost (and also to this mailing list). I'm using depth_first_search and it's vital for me to be able to specify the root vertex (4th argument), and that means also specifying the Color Map, which I don't care too much about. It'd be great to have a default color map but I'm a newbie and I didn't found anything in the docs. My initial options were: a) Using sth like a "default_color_map" class. I ignore if there is such thing. b) Creating a property map out of a vector, something like "vector_property_map<default_color_type>". I tried and it didn't work. c) Including a property in my graph called "color" of type "default_color_type", and creating a property map out of it. Didn't work either. Actually, I get an error when trying to include the property with that type (compiles if the property is an int). d) Just copying the color map that the algorithm uses when called without the color map argument. Hoping to find out how the BGL code works was simply unrealistic so I abandoned the idea. Is there any way to easily instantiate a Color Map? I'd post my code, but I have 6 or 7 versions none of which work. Any help will be much appreciated. Thanks ahead!

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Detect specialized template function?
by dherring＠ll.mit.edu 29 Jan '10

29 Jan '10

Slightly OT, but I was hoping someone here might know the magic incantation (which may involve a Boost library). Given a template class such as template <class T> struct S { void f(); void g() { T t(h()); cb(t) } T & h(); boost::function1<void, T &> cb; }; Is there a way to have S.f() behave differently depending on whether S.g() uses the default definition or whether it is specialized for this particular type? This detection needs to occur before S.g() is ever called. For example, the mere existance of the specialization template <> void S<int>::g() { ... } should trigger special logic in S<int>::f(). Thanks, Daniel P.S. The motivation for this is an attempt to retrofit a callback API that allows specialization of S.g() or the registration of a boost::function that gets called by the default S.g(). We need to disable callbacks until an actual function is registered via either method. It is easy to dispatch on registration of the boost::function; I don't know how to detect the specialization.

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[boost::function] Is there a way to assign a generic function, regardless number of parameters?
by Matheus Araújo Aguiar 29 Jan '10

29 Jan '10

Hello list, My doubt is simple. We need to implement some callbacks, but we don't want to declare a boost::function to every different callback, we just want to declare one generic boost::function to receive any function, with any number of parameters (the return type may be one well defined, no problem with that in our case). Is there a way to do this? What we want to do is something like is done in the asynchronous methods of boost::asio when passing the callback to the async operation. TIA, -- Matheus Araújo Aguiar Computer Scientist matheus.pit(a)gmail.com

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[UTF] Provide a custom init_unit_test
by Ahmed Badran 29 Jan '10

29 Jan '10

Hi, I have a single test module (defined via BOOST_TEST_MODULE), then multiple test suites, each defined in its own .cpp file and I am using a single header variant of the unit test framework. Is there an easy way to provide my own init_unit_test and have it plug into the rest of the system, with main and everything else provided by the utf library? I've looked at the headers of utf and it seemed that the generation of main and other initialization routines are tied to also providing an "init_unit_test" which causes a multiple definition problem at link stage. Regards, Ahmed

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Operator overloading of a class template in a namespace
by Surya Kiran Gullapalli 29 Jan '10

29 Jan '10

Hello all, Let me give you a heads up first. This is a general c++ question. not a boost one. But posting it here as we've C++ gurus out there. I've this piece of code http://paste.pocoo.org/show/171324/ The code fails to compile when *St.1 *is uncommented. I read some documents on operator overloading and namespaces and moved the output operator into the same namespace as the class (skg). This works fine. But my question is different. If the output operator is in global namespace and class in skg namespace *St. 2 * (cout statement) works fine, but not the copy statement. Why ? Thanks in advance, and apologies for offtopic. Surya

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Re: [Boost-users] [multi_array] compiling and changing an example
by Steven Watanabe 29 Jan '10

29 Jan '10

AMDG sean farrow wrote: > I'm trying to use boost::multi_array, I've included boost/multi_array.hpp > in the file and have the following code: > > private: > > typedef boost::multi_array<double, 3> array_type; > > typedef array_type::index index; > > array_type test(boost::extents[3][4][2]); > > Commenting out the third line compiles fine, but leaving this in gives a > c2061 error. It seems there is an issue with boost::extents, which header > is this in? I don't have a using boost; earlier, should I have? I'm using > visual c+ 2008. > It compiles fine for me with the trunk: #include <boost/multi_array.hpp> int main() { typedef boost::multi_array<double, 3> array_type; typedef array_type::index index; array_type test(boost::extents[3][4][2]); } What version of boost are you using? What is your code exactly (with #includes)? What is the exact error message? In Christ, Steven Watanabe

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The Boost difference b/w 32 and 64 bits
by JongKwan Kim 29 Jan '10

29 Jan '10

Hello, I am running my own C and C++ code using the Boost Library. First, I run the my code with Boost Library 1.36.0 on the 32 bits linux (Ubuntu) computer, so it is working well. However, I need to move the same code on the 64 bits linux (RedHat) computer. So, I am trying to run the code with Boost Library 1.41.0 on the 64 bits linux machine. At that time, the compiling is well, but when I run it, there is segmentation fault. I do not know if the problem is because of the difference between 32 bits and 64 bits or between 1.36.0 and 1.41.0 versions. Could you guys please let me know what is problem? When I type "make install" on the prompt window, I got messages like below.... ............................. /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libz.a(crc32.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(s_atan.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(s_cos.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(s_sin.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(w_exp.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(w_fmod.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(w_log.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(w_log10.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(w_pow.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(w_sqrt.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(s_round.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(m_isnan.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(m_finite.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(s_ceilf.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(s_cosf.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(s_floorf.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(s_sinf.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(w_expf.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(w_fmodf.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(w_logf.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(w_log10f.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(w_powf.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(w_sqrtf.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(s_roundf.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(m_isnanf.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(m_finitef.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(k_standard.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(s_lib_version.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(s_matherr.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(e_exp.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(e_fmod.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(e_log.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(e_log10.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(e_pow.o)' is incompatible with i386:x86-64 output /usr/bin/ld: warning: i386 architecture of input file `/usr/lib/libm.a(s_rint.o)' is incompatible with i386:x86-64 output ...............etc............. Thanks,

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[Boost Circular Buffer] Warning C4099 when compiling with boost/circular_buffer.hpp
by Lloyd Zslnka 28 Jan '10

28 Jan '10

Boost Version: 1.35.0 Compiler: Visual Studio 2008 Version 9.0.30729.1 SP OS: Windows XP SP3 Hello, I'm compiling boost/circular_buffer.hpp with my project and am getting the following warning message: ...\boost\boost_1_35_0\boost\circular_buffer\base.hpp(180) : warning C4099: 'boost::cb_details::iterator' : type name first seen using 'class' now seen using 'struct' ...\boost\boost_1_35_0\boost\circular_buffer\details.hpp(187) : see declaration of 'boost::cb_details::iterator' ...\boost\boost_1_35_0\boost\circular_buffer\base.hpp(2477) : see reference to class template instantiation 'boost::circular_buffer<T,Alloc>' being compiled In looking at details.hpp, I see that iterator is declared as a class on line 187, but in base.hpp it is declared as a struct on line 180. Is this a mistake or am I missing something? Thanks, Lloyd --------------------------------------------------------------------- This transmission (including any attachments) may contain confidential information, privileged material (including material protected by the solicitor-client or other applicable privileges), or constitute non-public information. Any use of this information by anyone other than the intended recipient is prohibited. If you have received this transmission in error, please immediately reply to the sender and delete this information from your system. Use, dissemination, distribution, or reproduction of this transmission by unintended recipients is not authorized and may be unlawful.

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Boost, bjam, and symbolic links
by svdbg＠free.fr 28 Jan '10

28 Jan '10

Hello, I generated some Boost librairies with bjam, and I get many symbolic links. For date_time : libboost_date_time-gcc41-mt-1_39.a libboost_date_time-gcc41-mt-1_39.so -> libboost_date_time-gcc41-mt-1_39.so.1.39.0 libboost_date_time-gcc41-mt-1_39.so.1.39.0 libboost_date_time-gcc41-mt.a -> libboost_date_time-gcc41-mt-1_39.a libboost_date_time-gcc41-mt.so -> libboost_date_time-gcc41-mt-1_39.so.1.39.0 Why don't I just get the .a and .so ? Why these 3 symbolic links ? And why do the original files have a so complicated name for the .so, with the release version mentionned twice ? Isn't it possible to just have : libboost_date_time-gcc41-mt-1_39.a libboost_date_time-gcc41-mt-1_39.so Thanks for help. I don't know what to do of these symbolic links. Note : I am a newbie in Linux.

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[Boost.Thread]
by Andrew Chinkoff 28 Jan '10

28 Jan '10

Hi. There is a test program I would to be explained to me: *** BEGIN OF TEST PROGRAM *** #include <stdio.h> #include <boost/thread.hpp> #define USE_SPINLOCKS //#define USE_MUTEXES boost::thread th1; boost::thread th2; boost::mutex mutex; int global_int = 0; bool IsNotEven(int code) { boost::mutex::scoped_lock locker(mutex); bool ret = (code & 1); return ret; } void thread_func() { for(int i = 0; i < 1000000; ++i) { #ifdef USE_MUTEXES if(IsNotEven(global_int)) // (1) #elif defined USE_SPINLOCKS if(__sync_fetch_and_and(&global_int, 1)) // (2) #else ERROR__WRONG_COMPILED; #endif global_int+=9; else global_int+=1; } } int main() { th1 = boost::thread(&thread_func); th2 = boost::thread(&thread_func); th1.join(); th2.join(); printf("global_int = %d\n", global_int); return 0; } *** END OF TEST PROGRAM *** Results of test program: 1) Test program compiled with USE_SPINLOCKS. Outputs are always: "global_int = 10" "global_int = 10" "global_int = 10" 2) Test program compiled with USE_MUTEXES. Outputs differ from each other: "global_int = 10000008" "global_int = 10000000" "global_int = 9763210" Could you explain me why outputs produced with USE_SPINLOCKS compilation differ from USE_MUTEXES ones? And what is the difference between (1) and (2) lines? Best, Andrew. P.S.: I use guest Ubuntu-8.04 installed on VirtualBox. Host OS = Vista.

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Problem compiling boost libraries
by Daniel Veneros 28 Jan '10

28 Jan '10

Hi, I´m trying to compile a simple example in NetBeans 6.8 on Solaris platform, the code is: struct shm_remove { shm_remove() { shared_memory_object::remove("MySharedMemory"); } ~shm_remove(){ shared_memory_object::remove("MySharedMemory"); } } remover; //Create a shared memory object. shared_memory_object shm (create_only, "MySharedMemory", read_write); //Set size shm.truncate(1000); //Map the whole shared memory in this process mapped_region region(shm, read_write); //Write all the memory to 1 std::memset(region.get_address(), 1, region.get_size()); //Launch child process std::string s(argv[0]); s += " child "; if(0 != std::system(s.c_str())) return 1; That's it, no big deal, but when I try to build this I receive the error: Undefinded first referenced symbol in file shm_unlink, sched_yield, shm_open Anyone knows how can I fix this?? Thanks!!! Dann

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Program options support for wide char
by Bo Jensen 28 Jan '10

28 Jan '10

Program options::options_description has a output operator for std::ostream, but none for std::wostream (if I am mistaken, please correct me). Shouldn't there be one ? I could surely need one :-) Regards Bo

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[asio] Detecting tcp peer disconnection
by Igor R 28 Jan '10

28 Jan '10

Hello, This issue has previously been discussed in details, and IIRC, the conclusion was that the reliable method to detect peer disconnection is to try reading from the socket. Now I encountered strange situation: I connect tcp socket to some proprietry server, then pull out the ethernet cable from the server side. If async_read_some was in progress - nothing happens, no handler is called. If I start an additional async_read_some - nothing happens. I tried to set SO_KEEPALIVE option and waited - nothing happened. My machine runs WinXPSP3, so async_read_some is delegated to WSARecv(). I'd appreciate any idea on the subj. Thanks.

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[boost-build] boost projects, like boost/python/boost_python
by Simon Pickles 28 Jan '10

28 Jan '10

Hello, Can anyone tell me how I find which jamfile is run when the line: <library>boost/python/boost_python is encountered by bjam? And are there equivalent 'shortcuts' to other boost libraries, particularly boost unit test framework? Many thanks Si

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[String Algo] error in ireplace_first or ireplace_all with std::wstring under gcc 3.4.2 (MingW)
by Doug Swanson 28 Jan '10

28 Jan '10

I hope this is the appropriate place to post -- I apologize in advance if it is not! The following code compiles and runs without error under g++ in Windows, GCC 3.4.2 (MingW): <code> #include <cstdio> #include <string> #include <boost/algorithm/string.hpp> using namespace std; using namespace boost; int main( void ) { string test = "This is a test"; ireplace_first( test, "test", "success" ); printf( "%s\r\n", test.c_str() ); return 0; } </code> The output is correct: "This is a success". If I change the above code to use a std::wstring instead, it will compile, but it will crash on execution: <code> #include <cstdio> #include <string> #include <boost/algorithm/string.hpp> using namespace std; using namespace boost; int main( void ) { wstring test = L"This is a test"; ireplace_first( test, L"test", L"success" ); printf( "%ws\r\n", test.c_str() ); return 0; } </code> Setting a breakpoint on std::terminate() in gdb gives the following backtrace: Breakpoint 1, 0x00407ae6 in std::terminate() () (gdb) bt #0 0x00407ae6 in std::terminate() () #1 0x00404dc2 in __cxa_throw () #2 0x004021d2 in std::__throw_bad_cast() () #3 0x00434c69 in std::ctype<wchar_t> const& std::use_facet<std::ctype<wchar_t> >(std::locale const&) (__loc=@0x22fe8c) at C:/Applications/Dev-Cpp/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/locale_facets.tcc:112 #4 0x0043415c in wchar_t std::toupper<wchar_t>(wchar_t, std::locale const&) ( __c=84, __loc=@0x22fe8c) at C:/Applications/Dev-Cpp/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/locale_facets.h:4553 #5 0x0041648c in bool boost::algorithm::is_iequal::operator()<wchar_t, wchar_t> (wchar_t const&, wchar_t const&) const (this=0x22fe8c, Arg1=@0x3e3df4, Arg2=@0x43702e) at C:/Applications/Boost_new/boost/algorithm/string/compare.hpp:71 #6 0x004163fb in boost::iterator_range<__gnu_cxx::__normal_iterator<wchar_t*, std::basic_string<wchar_t, std::char_traits<wchar_t>, std::allocator<wchar_t> > > > boost::algorithm::detail::first_finderF<wchar_t const*, boost::algorithm::is_iequal>::operator()<__gnu_cxx::__normal_iterator<wchar_t*, std::basic_string<wchar_t, std::char_traits<wchar_t>, std::allocator<wchar_t> > > >(__gnu_cxx::__normal_iterator<wchar_t*, std::basic_string<wchar_t, std::char_traits<wchar_t>, std::allocator<wchar_t> > >, __gnu_cxx::__normal_iterator<wchar_t*, std::basic_string<wchar_t, std::char_traits<wchar_t>, std::allocator<wchar_t> > >) const (this=0x22fe80, Begin={_M_current = 0x3e3df4}, End={_M_current = 0x3e3e10}) at C:/Applications/Boost_new/boost/algorithm/string/detail/finder.hpp:76 #7 0x00413fe8 in void boost::algorithm::find_format<std::basic_string<wchar_t, std::char_traits<wchar_t>, std::allocator<wchar_t> >, boost::algorithm::detail::first_finderF<wchar_t const*, boost::algorithm::is_iequal>, boost::algorithm::detail::const_formatF<boost::iterator_range<wchar_t const*> > >(std::basic_string<wchar_t, std::char_traits<wchar_t>, std::allocator<wchar_t> >&, boost::algorithm::detail::first_finderF<wchar_t const*, boost::algorithm::is_iequal>, boost::algorithm::detail::const_formatF<boost::iterator_range<wchar_t const*> >) ( Input=@0x22ff50, Finder=@0x22fe80, Formatter={m_Format = {m_Begin = 0x43701e, m_End = 0x43702e, singular = false}}) at C:/Applications/Boost_new/boost/algorithm/string/find_format.hpp:146 #8 0x004141b5 in void boost::algorithm::ireplace_first<std::basic_string<wchar_t, std::char_traits<wchar_t>, std::allocator<wchar_t> >, wchar_t[5], wchar_t[8]> (std::basic_string<wchar_t, std::char_traits<wchar_t>, std::allocator<wchar_t> >&, wchar_t[5] const&, wchar_t[8] const&, std::locale const&) (Input=@0x22ff50, Search=@0x43702e, Format=@0x43701e, Loc=@0x22ff40) at C:/Applications/Boost_new/boost/algorithm/string/replace.hpp:259 #9 0x004014e8 in main () at test.cpp:11 I am not competent enough with Boost to understand what the call stack is telling me, except that __throw_bad_cast( ) is the source of the crash. ireplace_all gives the same behavior as ireplace_first above. Furthermore, the problem does not arise if I use replace_first or replace_all instead of ireplace_first or ireplace_all. It compiles and runs correctly. Finally, the problem does not arise if I compile using MSVC 2008. It compiles and runs correctly. Does this indicate a problem with gcc (MingW) unicode support? Is there an easy way to circumvent it? Thank you very much for any suggestions!

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Re: [Boost-users] [date_time][serialization] Fast persistence ofboost::date_time::ptime
by pete＠pcbartlett.com 28 Jan '10

28 Jan '10

On Thu 28/01/10 13:20 , Jeff Garland <azswdude(a)gmail.com> wrote: > Igor R wrote: > >> However on this glance this doesn’t seem possible > non-intrusively. Perhaps > >> I’ve missed something, perhaps there’s a third way > – I would be grateful if > >> any could share any ideas. > > > > Yes, it was already discussed here: > > > http://groups.google.com/group/boost-list/browse_thread/thread/d799ca831185 > 01e4/04b184b4c7af8c0b?show_docid=04b184b4c7af8c0b> > > I believe nothing changed since then. > There's not a direct way to get at the internal representation of a > ptime, > which varies based on how the library is compiled (64 or 96 bits > depending on > settings -- the thread above isn't completely accurate on this > point). If > it's critically important, of course, you could modify the source > directly to > fit your particular setup and provide the internal representation > for your app > to serialize (add a to_int64 for example). As a general rule, > however, it's > unwise to store these values as integers since future versions of > the library > might, for example, expand the epoch range and hence these > serialized values > wouldn't be compatible -- that, and the aforementioned fact that the > internal > size isn't fixed are a couple of the reasons there isn't direct > access. > Jeff Thank you both for your helpful replies (and for the helpful library!) They are good reasons. The Boost.Serialization library has it versioning mechanisms so it would be possible for a more intrusive set of load/save functions to be future- and config-proof as well as being fast. However whilst that would suit me, it has its costs - I am sure many like the readability of the current archives and I am sure the maintainer likes that the serialization functions only need to use public members of the date_time classes!

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bjam --address-model=64 doesn't work anymore?
by Daher 28 Jan '10

28 Jan '10

Using msvc100 building with: bjam --address-model=64 and unable to link output libs in my project. msvc saying its X86 and not X64 am i missing something?

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C++ and quality of software
by Peter Foelsche 28 Jan '10

28 Jan '10

I was thinking. There should be some C++ software quality assurance institution. They would give a stamp of approval to software written in C++. Criteria would be: a.. no usage fixed-sized buffers b.. no usage of functions from the c library, which do not check for correct type, like *printf(), *scanf(). c.. no dangling resources, no resource leaks in any case d.. usage of C++ Exception Handling for reporting errors (all fallible OS-calls are wrapped into C++, this can be checked by denying read/write permissions on some object, the software is trying to read/write to) e.. clean design -- e.g. no protocols (no protocols is my way of saying, that all methods of classes can be used and make sense to be used, as soon as this object exists) What do you think? I also published this on my blog: http://foelsche.spaces.live.com/blog/cns!2BFA22F3AB9E833!921.entry

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[date_time][serialization] Fast persistence of boost::date_time::ptime
by Pete Bartlett 28 Jan '10

28 Jan '10

I am interested in serializing data structures like vector< pair< boost::date_time::ptime , double> > as quickly as possible. I see that ptime is a serializable object (in the Boost.Serialization sense) but on the surface this implementation looks slow - we first get a date and time_duration and then serialize the various components (mins,secs,subsecs) separately for the latter and construct a full ISO string for the date. Something faster is surely possible - digging into the implementation it looks like a (non-special) ptime is represented as boost::uint64_t so if we were privy to all implementation details we could use serialize that. However on this glance this doesn't seem possible non-intrusively. Perhaps I've missed something, perhaps there's a third way - I would be grateful if any could share any ideas. Thanks, Pete

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passing socket descriptor to a function
by pedro chaparro 28 Jan '10

28 Jan '10

Hi, i have the code below, i want to separate the open socket code from the writting fucntions, i want to call a escribir() function from the main but i¡m not clear the value i have to pass the function, inthe way i have below it has not work. thanks #include <ctime> #include <iostream> #include <string> #include <boost/asio.hpp> using boost::asio::ip::tcp; void escribir( tcp::socket socket){ std::string message = "mensaje"; boost::system::error_code ignored_error; boost::asio::write(socket, boost::asio::buffer(message), boost::asio::transfer_all(), ignored_error); } int main() { int contador=0; try { boost::asio::io_service io_service; tcp::acceptor acceptor(io_service, tcp::endpoint(tcp::v4(), 5544)); for (;;) { tcp::socket socket(io_service); acceptor.accept(socket); escribir(socket); } } catch (std::exception& e) { std::cerr << e.what() << std::endl; } return 0; } -- Ing Pedro Alonso Chaparro Valero Ciudad Politecnica de la Innovación iTEAM - Mobile Communications Group Polytechnic University of Valencia C\ Camino de Vera S/N, Edificio 8G 46022 Valencia, Spain

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