- Boost-users - lists.boost.org

time variant uuid
by Victor Whiskey Yankee 10 May '12

10 May '12

Hello List, How can I create uuids so that the first one compares less than the next one.. something like this: boost::uuids::t1 = boost::uuids::random_generator()(); boost::uuids::t2 = boost::uuids::random_generator()(); BOOST_REQUIRE (t1 < t2); I don't see how to replace random_generator() with a time-based variant, if that even makes sense. If this can be done, then is there a way to extract the date+time from it? Thanks, Vic

3 2

[Pool] Why is pool allocator slower than ordinary allocator?
by Mr.C64 10 May '12

10 May '12

Please see this thread on StackOverflow: http://tinyurl.com/chh4yxj Thanks.

5 13

[Statechart] Pass variable parameter to Player ctor?
by Dick Bridges 10 May '12

10 May '12

In the PingPong example, I'm trying to pass a std::string variable to the Player ctor through the fifo_schedular<>create_processor<>() in main(). No joy. Error: no matching signature. I'm missing something obvious. I've stared at that first override in the boost header and tried everything I could think of. Dead give away that I don't understand: I'm "trying" things. %>[ I'd sure appreciate it if someone could point me in the right direction. Are there async examples that pass variables through create_processor() to the ctorS? Thanks for taking the time to read this, Dick

2 1

[build] How can I change how the linker is called?
by Daryle Walker 10 May '12

10 May '12

This is for my PowerPC Tiger Mac system. I've installed GCC 4.7 fromMacPorts on it. I have it set in C++11 mode. Yesterday, I wrote on the list that I couldn't get the example file torun in my new trial project. (It's at<https://github.com/CTMacUser/Unionize>.) As soon as I added acompile-fail test and the corresponding line to Jamfile, everything worked! Sort of. The compile-fail test fails as expected (at compile-time).The example file still doesn't run due to a linking error I've seen before: //========================================[daryle@daryle-walkers-emac:test]$ b2 toolset=gcc-4.7...found 30 targets......updating 14 targets...common.mkdir bincommon.mkdir bin/super_union_basics.testcommon.mkdir bin/super_union_basics.test/gcc-4.7common.mkdir bin/super_union_basics.test/gcc-4.7/debuggcc.compile.c++ bin/super_union_basics.test/gcc-4.7/debug/super_union_basics.ogcc.link bin/super_union_basics.test/gcc-4.7/debug/super_union_basicsld: unknown option: --start-groupcollect2: error: ld returned 1 exit status "g++-mp-4.7" -o "bin/super_union_basics.test/gcc-4.7/debug/super_union_basics" -Wl,--start-group "bin/super_union_basics.test/gcc-4.7/debug/super_union_basics.o" -Wl,-Bstatic -Wl,-Bdynamic -Wl,--end-group -g ...failed gcc.link bin/super_union_basics.test/gcc-4.7/debug/super_union_basics......skipped <pbin/super_union_basics.test/gcc-4.7/debug>super_union_basics.run for lack of <pbin/super_union_basics.test/gcc-4.7/debug>super_union_basics...common.mkdir bin/super_union_fail_test.testcommon.mkdir bin/super_union_fail_test.test/gcc-4.7common.mkdir bin/super_union_fail_test.test/gcc-4.7/debuggcc.compile.c++ bin/super_union_fail_test.test/gcc-4.7/debug/super_union_fail_test.oIn file included from super_union_fail_test.cpp:9:0://======================================== Now "ld" points to a version of ld64 from MacPorts, but that error hasshown up before this. I don't think my versions of "ld" have"--start-group" or "--end-group" options. What should they be instead,and where do I make these changes? (Even if no one here can answer thefirst part, they should be able to answer the second. That's where I'llmake the changes if I have to ask about the first part elsewhere.) Oh, I've uploaded the version of the project used here. Its SHA ID is"535241c3f13a9488bd845549ce3b1cf661ffcbac". (It's the latest as of this writing.) Daryle W.

2 2

filesystem V3 path::normalize deprecated
by Shai Shasag 09 May '12

09 May '12

I have a question regarding the deprecated function path::normalize(). Before moving to V3 I used this function to resolve paths containing "..". For example: path myPath("/Dir_A/Dir_B/a.txt/.."); myPath->normalize(); now myPath is: "/Dir_A/Dir_B" How can this be done using V3 code? Thanks, Shai PS: Could not find in docs why this function was deprecated and what replacement available.

1 0

c++ serial com connection
by Evaggelos Tsampazis 09 May '12

09 May '12

Hi! I would like to ask if I can use the boost libraries on the IDE environment of GodeGear RAD studio (C++ builder) 2009? I included the header file <boost/asio.hpp> but I got some compilation errors. I would like to use the boost libraries to make a connection to the mobile phone (via USB) to send and receive AT Commands to it. The asio part is the best boost solution for my case. Can anyone help to explain how to make boost libraries work in the environment I am working in? Thanks, Evaggelos

3 2

[MSM] What's the easiest way to share data between states in a Boost.MSM state machine?
by B. Tommy Jensen 08 May '12

08 May '12

As the subject indicates, I'm trying to find the best way to share data between states in a MSM state machine. My first attempt has been to let each sub-machine and state inherit from a common base class, e.g.: struct MyStateMachine_ : public msm::front::state_machine_def<MyStateMachine_,CommonBaseClass> My idea is to add a reference to some shared data in the base class, making it easy to access the shared data from any state. The shared data reference must be passed to the base class. Questions: 1. Is it possible to pass constructor parameters to the common base class' constructor? I have tried different options without success, it seems that the default constructor with no arguments is the only option. 2. If 1. is not possible, what is the best way to initialize the shared property correctly? For example an easy method to iterate over all defined states? (not only the active ones). I have tried to iterate over all states with get_state_by_id, but this method does not enter sub-machines' states. 3. In general, what is the preferred way of implementing shared data between state classes in Boost.MSM? It would have been natural to store the data in the root state, but I can't see that there is an easy way to get access to the root FSM. (only the "nearest parent" FSM in the hierarchy is passed to the various event handler methods). Regards, Tommy

2 4

asio async_read_some handler called but has bad data
by Matt Fair 08 May '12

08 May '12

Hello, I have client/server code similar to the chat server, but I am using async_read_some/async_write_some. I am having a problem with my client when the server sends a bunch of data to it at one time. What happens is that it works for a while then readComplete is called with a full buffer and no error set, but my buffer has garbage and eventually causes my socket to crash. I wanted to check with everyone to see if they have seen this problem before, and if there is anything glaring that I'm doing wrong here with boost::asio. I noticed that in the http server it is using shared_from_this, is this necessary? If the server is sending the client data with async_write faster than I can processes it with async_read, could it cause some buffer overrun? Thanks, Matt My buffer is defined as a private array: static const unsigned int m_maxReadLength = 1024; // maximum amount of data to read in one operation char m_readBuffer[m_maxReadLength]; The client starts to read the socket with: void TCPSocket::readStart() { if(isOpen()) { // Start an asynchronous read and call read_complete when it completes or fails m_pSocket->async_read_some( boost::asio::buffer(m_readBuffer, m_maxReadLength), boost::bind( &TCPSocket::readComplete, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)); } } My readComplete method is: void TCPSocket::readComplete(const boost::system::error_code& error, size_t bytes_transferred) { // the asynchronous read operation has now completed or failed and returned an error if(!error && bytes_transferred <= m_maxReadLength) { //convert to string const string buffer(&m_readBuffer[0], &m_readBuffer[bytes_transferred]); //buffer eventually becomes junk ..... } else { //handle error } readStart(); //read some more data }

1 0

boost graph: isomorphism SIGSEGV
by Vömel Christof (vome) 08 May '12

08 May '12

Hi, when testing boost graph 1.46 isomorphism on two graphs of size 11869 on x86_64-suse-linux, g++ 4.6.2, compiled at various levels of optimization, I consistently get the following error. (on very small graphs, everything seems to work) Could this be due to a problem of recursion/stack size due to the size of the graph? Up to what size of graph is the isomorphism program sure to work? Thanks, Chris Program received signal SIGSEGV, Segmentation fault. 0x00000000004099a6 in boost::iterator_core_access::equal<boost::detail::out_edge_iter<__gnu_cxx::__normal_iterator<boost::detail::sei_<unsigned long, std::_List_iterator<boost::list_edge<unsigned long, boost::no_property> >, boost::no_property>*, std::vector<boost::detail::sei_<unsigned long, std::_List_iterator<boost::list_edge<unsigned long, boost::no_property> >, boost::no_property>, std::allocator<boost::detail::sei_<unsigned long, std::_List_iterator<boost::list_edge<unsigned long, boost::no_property> >, boost::no_property> > > >, unsigned long, boost::detail::edge_desc_impl<boost::undirected_tag, unsigned long>, long>, boost::detail::out_edge_iter<__gnu_cxx::__normal_iterator<boost::detail::sei_<unsigned long, std::_List_iterator<boost::list_edge<unsigned long, boost::no_property> >, boost::no_property>*, std::vector<boost::detail::sei_<unsigned long, std::_List_iterator<boost::list_edge<unsigned long, boost::no_property> >, boost::no_property>, std::allocator<boost::detail::sei_<unsigned long, std::_List_iterator<boost::list_edge<unsigned long, boost::no_property> >, boost::no_property> > > >, unsigned long, boost::detail::edge_desc_impl<boost::undirected_tag, unsigned long>, long> > (f1=..., f2=...) at /usr/include/boost/iterator/iterator_facade.hpp:535 535 return f1.equal(f2);

2 1

Aspen Meadows Resort suite available for up to 4 nights of C++Now Conference
by Pdruck 08 May '12

08 May '12

Hi. I reserved a suite at Aspen Meadows Resort for 4 nights, for the C++Now conference; Sunday night, May 13 – Wed night, May 16, leaving Thurs. May 17. But due to last minute pressing events in the office, I have to cancel my registration. Propose to switch my reservation to whomever might be attending. Win-win. I don’t lose a heft cancellation fee. You get a beautiful suite (having been there previously) and conveniently located to the conference at Physics Center. Regards. Phil

1 0