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

Some of Boost Regex++ not recognized
by lsimons 13 Jul '09

13 Jul '09

<hoping this isn't a double post. Had some trouble with connection first time> I really appreciate the work done on the Boost libraries. I've used them in other projects and it's always been a welcome relief. For my current project, I'm trying to use the Boost Regex++ library in MSVC++ 6.0 (under Vista) to do some basic regex. I've installed the libraries as per the tutorial and added the Boost path to my compiler and linker includes. A lost of the basic functionality works fine, but I'm having trouble with autocompletion. The bigger issue is that certain parts of the library seem to throw the compiler. Ex that comiples fine: #include "stdafx.h" #include <boost/regex.hpp> #include <string.h> using namespace std; using namespace boost; int main(int argc, char* argv[]) { regex expr("^&[a-zA-Z0-9_ ]+,\\s+[a-zA-Z0-9_ ]+,\\s+[0-9].+"); string text = "&AirSpeed_Error, tla_error, 2 \\test stuff"; bool result; result = regex_match(text,expr); if (result == true) cout << "Match" << endl; else cout << "No Match" << endl; return 0; } If I add the line "match_flag_type flags = match_default;" I receive three errors: C:\Users\me\Documents\test\test.cpp(30) : error C2065: 'match_flag_type' : undeclared identifier C:\Users\me\Documents\test\test.cpp(30) : error C2146: syntax error : missing ';' before identifier 'flags' C:\Users\me\Documents\test\test.cpp(30) : error C2065: 'flags' : undeclared identifier Error executing cl.exe. I think I might simply have something misconfigured in MSVC6, and I would appreciate any comments or suggestions towards resolving the issue. Please let me know if there's any additional info I can provide. Thanks, Louis -- View this message in context: http://www.nabble.com/Some-of-Boost-Regex%2B%2B-not-recognized-tp24219036p2… Sent from the Boost - Users mailing list archive at Nabble.com.

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Boost ASIO - SO_LINGER Socket option is not working
by Nick Aschberger 07 Jul '09

07 Jul '09

Hi All, I have a situation where at termination of my program, I am closing my socket, and then deleting the socket object. Note, we are using non-asynchronous (blocking) accesses at this point, boost is version 1.36. In some cases, the socket has had some data written to it, but that data is never received by the connected client - because I destroy the socket before the data is sent. So, SO_LINGER is the socket option that is supposed to solve all my worries (it should wait on close for any unsent data to be sent), however I am using it and there is no effect. I presume because I'm doing something wrong. Here is my psuedo-code flow: /* Creation of socket */ m_socket = new boost::asio::ip::tcp::socket(m_io_service); /* Connect the socket with something like: */ acceptor.accept(*m_socket, error); /* Set SO_LINGER option on connected socket */ boost::asio::socket_base::linger linger_op(true, 2000); m_socket->set_option(linger_op); /* program executes, does some stuff */ /* At termination */ // close the socket m_socket->close(); delete(m_socket); I experimented with m_socket->shutdown() instead of close, and it made little difference. In fact, from the documentation it seems shutdown() is the one I definitely don't want to call, as close() is supposed to wait for data to be sent. If anyone has some suggestions as to what would be correct, I would much appreciate it. cheers Nick Aschberger

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[Interprocess] Compilation errors for atomic operations.
by d s 06 Jul '09

06 Jul '09

I am using managed_shared_memory to implement a cache. However during compilation I get the following error - g++ -o .build/CacheLib/cachebase.pic.o -c -fPIC -m64 -g -isystem /usr/local/include/c++/3.4.2 -isystem /usr/local/include/c++/3.4.2/sparc-sun-solaris2.9 -isystem /usr/include -isystem /usr/local/include-isystem /usr/local/lib/gcc/sparc-sun-solaris2.9/3.4.2/include -isystem /usr/include/sys -nostdinc -nostdinc++ -I/usr/local/include/boost-1_39 -I/geneva1/apps/IRB_2.2.30/2.2.30_CURRENT/include -I/oracle/product/9.2.0/rdbms/demo -I.build/CacheLib -Isrc/CacheLib -I/usr/local/include/log4cpp src/CacheLib/cachebase.cpp In file included from /usr/local/include/boost-1_39/boost/interprocess/detail/managed_open_or_create_impl.hpp:20, from /usr/local/include/boost-1_39/boost/interprocess/managed_mapped_file.hpp:20, from src/CacheLib/cachebase.h:12, from src/CacheLib/cachebase.cpp:8: /usr/local/include/boost-1_39/boost/interprocess/detail/atomic.hpp: In function `boost::uint32_t boost::interprocess::detail::atomic_add32(volatile boost::uint32_t*, boost::uint32_t)': /usr/local/include/boost-1_39/boost/interprocess/detail/atomic.hpp:331: error: `atomic_add_32_nv' undeclared (first use this function) /usr/local/include/boost-1_39/boost/interprocess/detail/atomic.hpp:331: error: (Each undeclared identifier is reported only once for each function it appears in.) /usr/local/include/boost-1_39/boost/interprocess/detail/atomic.hpp: In function `boost::uint32_t boost::interprocess::detail::atomic_cas32(volatile boost::uint32_t*, boost::uint32_t, boost::uint32_t)': /usr/local/include/boost-1_39/boost/interprocess/detail/atomic.hpp:341: error: `atomic_cas_32' undeclared (first use this function) /usr/local/include/boost-1_39/boost/interprocess/detail/atomic.hpp: In function `boost::uint32_t boost::interprocess::detail::atomic_inc32(volatile boost::uint32_t*)': /usr/local/include/boost-1_39/boost/interprocess/detail/atomic.hpp:347: error: `atomic_add_32_nv' undeclared (first use this function) /usr/local/include/boost-1_39/boost/interprocess/detail/atomic.hpp: In function `boost::uint32_t boost::interprocess::detail::atomic_dec32(volatile boost::uint32_t*)': /usr/local/include/boost-1_39/boost/interprocess/detail/atomic.hpp:353: error: `atomic_add_32_nv' undeclared (first use this function) scons: *** [.build/CacheLib/cachebase.pic.o] Error 1 scons: building terminated because of errors. I am using gcc version 3.4.2 on solaris 9. Reading specs from /usr/local/lib/gcc/sparc-sun-solaris2.9/3.4.2/specs Configured with: ../configure --with-as=/usr/ccs/bin/as --with-ld=/usr/ccs/bin/ld --disable-nls Thread model: posix gcc version 3.4.2 Kindly advice what is the problem? Is there any way I can use pthread atomic operation instead to solaris atomic operations. Note: The same code is working fine on RHEL Enterprise 5 and Hp-UX.

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A question on overloaded function? Can anyone with kindness help me?
by fmingu 05 Jul '09

05 Jul '09

I use Dev-C++,and the snipet of the program is: #pragma hdrstop # include <iostream> # include <vector> # include <iterator> # include "boost/math/common_factor.hpp" # include "boost/lambda/lambda.hpp" # include "boost/lambda/bind.hpp" # include "boost/lambda/if.hpp" # include "boost/lambda/casts.hpp" # include "boost/lambda/construct.hpp" # include "boost/lambda/loops.hpp" # include "boost/lambda/switch.hpp" # include "boost/tuple/tuple.hpp" # include "boost/tuple/tuple_comparison.hpp" # include <string> # include <map> using namespace std; using namespace boost::lambda; using namespace boost; void a(){ std::cout<<std::pow(4,3); return; } ............... but the complier told me that: main2test.cpp: In function `void a()': main2test.cpp:69: call of overloaded `pow(int, int)' is ambiguous F:/CB2009/Dev-Cpp/include/math.h:162: candidates are: double pow(double, double) F:/CB2009/Dev-Cpp/include/c++/cmath:401: float std::pow(float, float) F:/CB2009/Dev-Cpp/include/c++/cmath:410: long double std::pow(long double, long double) F:/CB2009/Dev-Cpp/include/c++/cmath:419: double std::pow(double, int) F:/CB2009/Dev-Cpp/include/c++/cmath:423: float std::pow(float, int) F:/CB2009/Dev-Cpp/include/c++/cmath:427: long double std::pow(long double, int) And in my computer, the C++ libraries includes are F:\CB2009\Dev-Cpp\include\c++ F:\CB2009\Dev-Cpp\include\c++\mingw32 F:\CB2009\Dev-Cpp\include\c++\backward F:\CB2009\Dev-Cpp\include F:\CB2009\boost_1_34_1\boost_1_34_1 I do not know how to solve it.I do not use <math> or <cmath> yet. Why the complier told me such files? And whether the two files are included in other files or not? And can I use: bind(&std::pow,constant(-1),bind(&IIPrimemap::size,var(primemapvec))); in the program? where : typedef std::pair<int, int> IIPrimepair; std::vector<IIPrimepair> primepairvec; Can anyone with kindness help me?

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[Boost.Test] [1.38] Handling unexpected exceptions and system errors
by Greg Christopher 04 Jul '09

04 Jul '09

Hi, One of the things that sets boost apart from other frameworks is its ability to handle exceptions and report them. While I've used the BOOST_CHECK_THROW and BOOST_CHECK_EXCEPTION macros, I'd like a way to pass if an exception is thrown that we don't necessarily understand how to mention in the BOOST_CHECK_THROW or BOOST_CHECK_EXCEPTION macros. BOOST_CHECK_NO_THROW just makes sure no exception is thrown. In some ways it's an odd request to say "I expect some exception to be thrown that I do not care to specify", but that would work for us. In addition, it would be nice (and I bet it's already available) to be able to say "allow next test case to run in event of exception" or "allow next test suite to run In event of exception". Right now, all testing does seem to abort (none of the above macros are either present or coded in a way to match the system issue. Any tips on how to discover those values, or to go forward when some kind of exceptional condition is expected is appreciated. -Greg

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Support of Pretty print
by Mario Chacon 02 Jul '09

02 Jul '09

Hello: Is is possible that boost have gdb pretty prints??.. It's works great with std objects, it will be awesome if boost have it too!! Salu2... masch...

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[interprocess] named_upgradable_mutex
by Moritz 02 Jul '09

02 Jul '09

Hi everybody, I have a question concerning the interprocess::updgradable::mutex. My scenario: I have a writer, which is manipulating an object in a interprocess::managed_shared_memory. And I have 'n' readers which are reading the object in the shared mem. If the writer is ready to write, it should get the possibility as fast as possible. So this is a variety of the classical readers/writers problem and I already found a good solution that fits my requirements. But this solution uses 3 mutexes and 1 counter so I am looking for a more efficient solution. The idea is that the writer locks the upgradable_mutex normally (calling lock()) and the readers lock it sharable (calling lock_sharable()). If the mutex is locked sharable and the writer tries to lock it normally, another attempt to lock it sharable has to wait until the writer succeeded in locking and unlocking the mutex. Is this correct proceeding? Thank you Moritz

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python context scope question
by Christopher Harvey 02 Jul '09

02 Jul '09

I'm running a bunch of python scripts from a directory, one after the other. I want to make sure that those scripts don't interfere with each other. My code looks like this: for(directory_iterator itr(filterDir);itr!=directory_iterator();++itr) { if(itr->path().extension()==".py") { try { object global = import("__main__").attr("__dict__"); object sys = import("sys"); sys.attr("path").attr("append")(str(filterDir)); exec_file(str(itr->path().string()), global, global); } catch(error_already_set const &) { cout<<"Python syntax/runtime error."<<endl; PyErr_Print(); } catch(...) { cout<<"Uknown error from script file: "<<itr->path()<<endl; } } } Basically what I want to know is this: For every iteration of the exterior for loop will any of the scripts that are executed be able to impact in any way another script that is executed? For example, I was thinking a script could remove that path that I want to add from the import search paths and break the next script that is run, since it wouldn't have that path. thanks.

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interprocess::message_queue thread safety
by Moritz 01 Jul '09

01 Jul '09

Hi everybody, I have a question concerning the interprocess::message_queue. Is the send(..) function thread safe? I have one message_queue and only one thread which is reading messages from the queue. But I have 'n' threads that are writing to the queue. Is there any synchronization mechanism needed to avoid unexpected behavior? Thank You Moritz

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Getting started with boost: Linker error on boost::system::get_system_category
by Alex Black 01 Jul '09

01 Jul '09

I'm just getting started with boost: - I'm using boost::asio - I'm on Vista x64, using Visual Studio 2008 SP1 - I built the x64 libs using bjam --address-mode=64 .... - I've got my code compiling (but not linking) - I got it pointed to the libs, so it finds the datetime, regex lib etc I get these errors: Error 84 error LNK2001: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::get_system_category(void)" (?get_system_category@system@boost@@YAAEBVerror_category@12@XZ) Error 85 error LNK2001: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::get_generic_category(void)" (?get_generic_category@system@boost@@YAAEBVerror_category@12@XZ) any tips? thx - Alex

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