- Boost-users - lists.boost.org

error in compilation
by pedro chaparro 20 Apr '10

20 Apr '10

Hi everyone, i'm traying compile the example http://www.boost.org/doc/libs/1_42_0/doc/html/boost_asio/tutorial/tutdaytim…, but i getting this error, what i missing?? Thanks!! pp@hobbes:/home/pdro7/ns-Sockets# c++ -I ../boost_1_40_0 myserver.cpp -o myserver /usr/include/libboost_system.a /usr/include/libboost_thread.a /usr/include/libboost_date_time.a /usr/include/libboost_regex.a /usr/include/libboost_serialization.a -lpthread /usr/include/libboost_system.a(error_code.o): In function `boost::system::get_generic_category()': error_code.cpp:(.text+0x90): undefined reference to `__cxa_guard_acquire' error_code.cpp:(.text+0xaa): undefined reference to `__cxa_guard_release' /usr/include/libboost_system.a(error_code.o): In function `boost::system::get_system_category()': error_code.cpp:(.text+0x100): undefined reference to `__cxa_guard_acquire' error_code.cpp:(.text+0x11a): undefined reference to `__cxa_guard_release' /usr/include/libboost_system.a(error_code.o): In function `(anonymous namespace)::generic_error_category::message(int) const': error_code.cpp:(.text+0x176): undefined reference to `__cxa_guard_acquire' error_code.cpp:(.text+0x1eb): undefined reference to `__cxa_guard_release' error_code.cpp:(.text+0x231): undefined reference to `__cxa_guard_abort' /usr/include/libboost_system.a(error_code.o): In function `boost::system::errc::make_error_condition(boost::system::errc::errc_t)': error_code.cpp:(.text._ZN5boost6system4errc20make_error_conditionENS1_6errc_tE[boost::system::errc::make_error_condition(boost::system::errc::errc_t)]+0x38): undefined reference to `__cxa_guard_acquire' error_code.cpp:(.text._ZN5boost6system4errc20make_error_conditionENS1_6errc_tE[boost::system::errc::make_error_condition(boost::system::errc::errc_t)]+0x52): undefined reference to `__cxa_guard_release' collect2: ld returned 1 exit status -- 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

1 0

Re: [Boost-users] Inconsistent dll linkage trying to use boost/test as dll
by McNamara, Nate 20 Apr '10

20 Apr '10

Mikko, Thanks! With Dependency Walker, I was able to fix the problem. Cheers, Nate ________________________________________ This E-Mail (including any attachments) may contain privileged or confidential information. It is intended only for the addressee(s) indicated above. The sender does not waive any of its rights, privileges or other protections respecting this information. Any distribution, copying or other use of this E-Mail or the information it contains, by other than an intended recipient, is not sanctioned and is prohibited. If you received this E-Mail in error, please delete it and advise the sender (by return E-Mail or otherwise) immediately. This E-Mail (including any attachments) has been scanned for viruses. It is believed to be free of any virus or other defect that might affect any computer system into which it is received and opened. However, it is the responsibility of the recipient to ensure that it is virus free. The sender accepts no responsibility for any loss or damage arising in any way from its use. E-Mail received by or sent from RBC Capital Markets is subject to review by Supervisory personnel. Such communications are retained and may be produced to regulatory authorities or others with legal rights to the information. IRS CIRCULAR 230 NOTICE: TO COMPLY WITH U.S. TREASURY REGULATIONS, WE ADVISE YOU THAT ANY U.S. FEDERAL TAX ADVICE INCLUDED IN THIS COMMUNICATION IS NOT INTENDED OR WRITTEN TO BE USED, AND CANNOT BE USED, TO AVOID ANY U.S. FEDERAL TAX PENALTIES OR TO PROMOTE, MARKET, OR RECOMMEND TO ANOTHER PARTY ANY TRANSACTION OR MATTER.

1 0

Passing * to member function as parameter
by Etienne Philip Pretorius 20 Apr '10

20 Apr '10

Hello List, I am using boost::asio. My client performs a lot of async read requests and then only responds to those with a write operation. How would I pass a pointer to a member function from the read request to the write handler to call when it performs the write. void handle_read_banner( const boost::system::error_code& error, std::size_t bytes_transferred ) { if(!error) { response_.consume(bytes_transferred); boost::asio::async_write(socket_, request_, boost::bind(&asterisk::handle_write_request, this, boost::asio::placeholders::error //, * to next read handler... )); }else{ throw(boost::system::system_error(error)); } } void handle_write_request( const boost::system::error_code& error //, memfunction func ) { if (!error) { boost::asio::async_read_until(socket_, response_, "\r\n", boost::bind( //&asterisk::handle_read_login_attempt, func this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)); }else{ throw(boost::system::system_error(error)); } } Thank you, Etienne

2 1

serialization of unordered_map
by Igor Filippov 20 Apr '10

20 Apr '10

I am struggling with getting serialization to work with unordered_map. I have found someone else's header file for that purpose and modified it so the compilation goes through without errors, however I'm getting segfault when attempting to run the executable. The header file is attached, any help will be most appreciated. Best regards, Igor P.S. I believe the original code is from René Bürgel who asked for it to be included into serialization library back in 2007.

1 0

[BGL] graph serialization
by Damien Maupu 19 Apr '10

19 Apr '10

Dear all, I have a graph with edge property is a smart pointer to myEdge class. I want to save my graph and choose the serialization option. Saving the graph seems to work (if exporter to a text file I can see that information is there). Unfortunately, loading the graph fails as no edges are loaded. In facts, the edge data is loaded (if I stop the debugger to the edge serialization info seems to come) but not added to the graph. In file adj_list_serialize.hpp Ln 95: tie(e,inserted) = add_edge(verts[u], verts[v], graph); Boolean "inserted" is true but still no edge is added to my graph m_edges array (size keep to be 0). I was wandering if it's because I am using smart pointer as my edge property and that while saving doesn't require memory allocation for the edge smart pointer, loading will. Would it be possible that this step is skip? How could I fixed it? Did anyone faced the same problem My graph is a adjacency list and I did add the definition BOOST_SERIALIZATION_SHARED_PTR for myEdge class. Thank you very much Damien

2 1

Boost TR1 sub-package
by Michael Jackson 19 Apr '10

19 Apr '10

Does there exist a Bosot-TR1 sub-package that I could use on a cross platform project? I am interested specifically in the TR1 stuff and not the rest of Boost and it seems that using Boost-TR1 would be the most portable way to use TR1 since not all compiler vendors have a TR1 implementation ready yet. Thoughts? -- Mike Jackson

1 0

Error with GCC and TR1 (error: no include path in which to search for tr1/type_traits)
by Anteru 19 Apr '10

19 Apr '10

Hi, I'm using GCC 4.4 with Boost 1.40, and I've recently came across a library which uses tr1/tuple. The problem I'm running into now is that I include <boost/tr1/tuple.hpp>, and it does not include <tr1/tuple>, but rather pulls in the Boost implementation -- which gives me compile errors like /usr/include/boost/tr1/tuple.hpp:63: error: ‘tuple’ is already declared in this scope /usr/include/boost/tr1/tuple.hpp:72: error: ‘tuple_size’ is already declared in this scope /usr/include/boost/tr1/tuple.hpp:73: error: ‘tuple_element’ is already declared in this scope So I'd really like to pull in the TR1 implementation from the compiler, to avoid these collisions. In order to fix this, I tried to define BOOST_HAS_GCC_TR1 as specified in the docs -- without success, I'm getting now /usr/include/boost/tr1/type_traits.hpp:13:49: error: no include path in which to search for tr1/type_traits As described in the docs, I added several more defines: DBOOST_HAS_GCC_TR1 BOOST_TR1_DISABLE_INCLUDE_NEXT=1 BOOST_TR1_GCC_INCLUDE_PATH=/usr/include/c++/4.4/ without success, I'm still getting the "no include path" error. I'm using the system boost, which is installed in /usr/include/boost; and I'd really like to keep using it. Is there any other way to force Boost to pick up the compiler's TR1 library? Cheers, Anteru

2 1

[Review] [ITL] ITL formal review results
by Hartmut Kaiser 19 Apr '10

19 Apr '10

Hi all, The formal review of the Interval Template Library (ITL) written by Joachim Faulhaber started February 18th and ended March 7th, 2010. We saw a lively discussion resulting in 14 votes: 10 people voted unconditionally YES, 3 voted conditionally YES, and 1 reviewer voted NO. The overwhelming majority of the votes was YES which reflects the overall discussion and the general consensus of this library being worth to be included into Boost. Based on this result and the discussions we saw the Interval Template Library is now formally accepted into Boost. Detailed results ---------------- Pros: Almost all reviewers highlighted the general usefulness of the library. The more experience the reviewers had with the library in real world applications the more they emphasized its usefulness. Here are some quotes: - "ITL solved this problem for me, in a way that honestly freed me from having to think about a lot of the unsavory low-level details." - " Until now, we only used the library for intervals of date-times (coded as integers), but I'm sure, that its usefulness goes far beyond." - " Very useful. I mentioned two projects where the library would have helped me if it had been into Boost earlier, and I'm considering rewriting them such that the problems make use of the library, and simplify them in that way." The comments on the quality of the documentation are unanimous: "impressive and quite complete", "I couldn't ask for more". It seemed to be generally helpful to understand the concepts of the library and to get started. Some people asked to add more simple quick-start examples to the documentation and the distribution. Overall, the library is mature and easy to use. All reviewers actually utilizing the ITL library for real world use cases reported they were able to start quickly and without problems. All reviewers using ITL in real world applications stated that no performance problems were encountered. This is important to note as the NO vote was based on the current lack of a interval tree implementation, which was considered to result in suboptimal performance for certain use cases. Cons: Some aspects of the design have been criticized: "OO-type design decisions", "fat 'one size fits all'-interval class template", and "incomplete extraction of global functions" are the major points of critique. These points have real merit. In order to make the design and interface more flexible and more durable these have to be rectified before the final inclusion of the library into Boost's code base. Joachim already agreed to a list of things to change addressing those problems. For certain use cases, specifically for interval map of collections, the current implementation has suboptimal complexity characteristics that leads to O(n^2) space usage in the worst case. OTOH, for the majority of applications of the library the worst case scenario seems to be (reportedly) irrelevant. This issue has been discussed at length and Joachim plans to add an implementation with a better worst case performance of the affected class templates as later optimizations. This is not considered to be a precondition to full inclusion into Boost's code base as it is not anticipated to cause any interface changes. Last but not least people suggested to change the name of the library as having the word template in the name does not carry any useful information. Joachim already agreed to this. Regards Hartmut Review Manager --------------- Meet me at BoostCon www.boostcon.com

2 1

[circular_buffer] About overwriting elements
by Daniele Barzotti 19 Apr '10

19 Apr '10

Hi, in the introductory example I see this: int a = cb[0]; // a == 1 int b = cb[1]; // b == 2 int c = cb[2]; // c == 3 // The buffer is full now, pushing subsequent // elements will overwrite the front-most elements. cb.push_back(4); // Overwrite 1 with 4. cb.push_back(5); // Overwrite 2 with 5. // The buffer now contains 3, 4 and 5. a = cb[0]; // a == 3 b = cb[1]; // b == 4 c = cb[2]; // c == 5 and I would ask why the 4 and 5 are in the 2nd and 3th position instead of 1st and 2nd respectively. I thought that it worked in the following way: 1 2 3 1 2 3 1 2 3 [A][B][C] -> push_back(D) -> [D][B][C] -> push_back(E) -> [D][E][C] I need a circular buffer for buffering network data and I need that the old data is replaced but doesn't change its position.. Thanks, Daniele.

3 6

[serialization] postprocessing object after deserialization
by Václav Šmilauer 19 Apr '10

19 Apr '10

Hi, I am using boost::serialization for hierarchy of classes; I need to process attributes after deserialization, but I am facing some (perhaps design) issues. The top class is Serializable, with serialization code like this: struct Serializable{ friend class boost::serialization::access; virtual void preProcess(bool deserializing){} virtual void postProcess(bool deserializing){} template <class ArchiveT> void serialize(ArchiveT & ar, unsigned int version){ // this sequence is always the same: preProcess(ArchiveT::is_loading::value); // preprocess /* no base class to be serialized */ // serialize base class /* no attributes in Serializable itself */ // serialize attributes postProcess(ArchiveT::is_loading::value); // postprocess }; }; Each derived class then defines serialize function and optionally overrides {pre,post}Process, which are meant for pre-computing some non-serialized data from known attributes, for instance. struct Derived: public Serializable{ friend class boost::serialization::access; template <class ArchiveT> void serialize(ArchiveT & ar, unsigned int version){ preProcess(ArchiveT::is_loading::value); // preprocess ar & BOOST_SERIALIZATION_BASE_OBJECT_NVP(Serializable); // base class ar & BOOST_SERIALIZATION_NVP(attr1); // attributes ar & BOOST_SERIALIZATION_NVP(attr2); postProcess(ArchiveT::is_loading::value); // postprocess } }; The problem is that {pre,post}Process are not overridden in most cases and will be called multiple times, perhaps with invalid data: e.g. when deserializing derived class, postProcess will be called for each parent class; since it is virtual, it will end up calling Derived::postProcess _before_ attr1 and attr2 are deserialized from archive. Later, it will be called again. My questions are therefore: 1. If boost::serialization provides some hook functions for this purpose (I didn't find anything in documentation and via google either) 2. If you can suggest some way to have the {pre,post}Process function called for each class exactly once, at the right place(s). Best regards, Vaclav

1 0