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write_graphviz requires not only VertexListGraph, but also EdgeListGraph
by Richard Ulrich 09 Jul '09

09 Jul '09

Hi everybody, this is my first post to the boost mailing list. I'm using boost_1_39 I wanted to use write_graphviz today with my custom graph adapter that implements VertexListGraph as well as IncidenceGraph. The documentation states, that write_graphviz only requires a VertexListGraph. But inside, it uses an edge_iterator, and calls edges(g), both of which belong to the EdgeListGraph. Am I right here, or did I miss something? If yes, should I implement a specialization that only calls out_edges() for every vertex, and thus a VertexListGraph would be sufficient? With kind regards Richard

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Null shared pointer confusion
by Carl Hetherington 09 Jul '09

09 Jul '09

Hi, In the following program... #include <boost/shared_ptr.hpp> #include <boost/weak_ptr.hpp> class A {}; int main () { boost::shared_ptr<A> x; // A: bad_weak_ptr thrown // boost::shared_ptr<A> x ((A *) 0); // B: works boost::weak_ptr<A> y (x); boost::shared_ptr<A> z (y); } ... I observe that with line A included (but not line B), a bad_weak_ptr is thrown by the line which declares z. With line B included (but not line A), all is well. >From looking at the boost source, it seems that line A results in a shared_ptr to nothing (use_count() == 0), and line B results in a shared_ptr to 0 (use_count() == 1). I can work around this, I'm sure. Can anyone clarify my muddled thinking and explain why boost is behaving correctly in this situation (if indeed it is!) Many thanks Carl

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[serialization] 1.34.1 -> 1.35 vector bug
by Josh Kelley 08 Jul '09

08 Jul '09

I'm upgrading from C++Builder 2007 with Boost 1.34.1 to C++Builder 2009 with Boost 1.35. (I realize that this is a few versions behind, but C++Builder compatibility seems problematic enough that I'm going to try sticking with 1.35, which is what the vendor officially supports. Or would people here recommend using a later version?) I'm running into problems loading XML archives containing vectors that were created by Boost 1.34.1. This appears to be the same problem that others have reported: https://svn.boost.org/trac/boost/ticket/1774 https://svn.boost.org/trac/boost/ticket/2271 http://lists.boost.org/boost-users/2009/05/48292.php If I understand those pages correctly, to work around this problem, I should be able to copy the relevant changes from Boost 1.39.0's boost/serialization/vector.hpp and boost/serialization/array.hpp, plus change BOOST_SERIALIZATION_VECTOR_VERSION from 3 to 4, and my copy of 1.35 will work both with 1.34.1 and with 1.36 and above. Is this correct? Thanks. Josh Kelley

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boost::random distribution is not working within a custom class
by Oliver Fochler 08 Jul '09

08 Jul '09

Hey there, I'm having a problem with the boost::random library and I can't figure out what's going on, so maybe you guys might help me out. Here's the scenario (code below): I wrote a small class that should encapsulate a random number generator (floating point, uniform in [0,1) ) so that I ultimately can switch between different approaches (boost and non-boost) without the rest of my code ever caring. Within this class I have a boost::mt19937 object and a pointer to a boost::uniform_01<boost::mt19937&, double> as private members. Within the constructor I actually create an instance of uniform_01 via new and initialize it with the mt19937 RNG. Now within the constructor (see cout statement) the ran_boost->operator()() or (*ran_boost)() work perfectly and yield some random double between 0 and 1. However, when using the randomNumberGenerator object created in main.cpp I'm struck with segfault. Doing some backtrace it turns out that it fails with in boost::random::mersenne_twister<unsigned int, 32, 624, 397, 31, 2567483615u, 11, 7, 2636928640u, 15, 4022730752u, 18, 3346425566u>::operator() ( this=0x89485ed18949ed31) at /home/fochler/usr/include/boost/random/mersenne_twister.hpp:275 If I try to use global object ran2 (declared extern in random2.h and defined in random2.cpp) I also get a segfault, this time with in boost::random::detail::pass_through_engine<boost::random::mersenne_twister<unsigned int, 32, 624, 397, 31, 2567483615u, 11, 7, 2636928640u, 15, 4022730752u, 18, 3346425566u>&>::base (this=0x0) at /home/fochler/usr/include/boost/random/detail/pass_through_engine.hpp:42 42 base_type& base() { return helper_type::ref(_rng); } I don't really know (a) what is going on and what I've messed up and (b) whether these two errors (using the local and the global object) are connected. It would be great if somebody could help me out. Cheers, Oliver Some minimal example ----------------- random2.h ----------------- #ifndef RANDOM_NG_H #define RANDOM_NG_H #include <stdint.h> #include <boost/random.hpp> class randomNumberGenerator { public: randomNumberGenerator( const uint32_t s ); double operator()() { return ran_boost->operator()(); } private: boost::mt19937 rng_mt_boost; boost::uniform_01<boost::mt19937&, double> * ran_boost; }; extern randomNumberGenerator ran2; #endif ----------------- random2.cpp ----------------- #include <iostream> #include <boost/random.hpp> #include "random2.h" randomNumberGenerator ran2; randomNumberGenerator::randomNumberGenerator( const uint32_t s ) { boost::uniform_01<boost::mt19937&, double> * ran_boost = new boost::uniform_01<boost::mt19937&, double>( rng_mt_boost ); rng_mt_boost.seed( s ); std::cout << ran_boost->operator()() << std::endl; } ----------------- main.cpp ----------------- #include "random2.h" int main(int argc, char **argv) { randomNumberGenerator ran3( 1234567 ); double a = ran2(); double b = ran3(); return 0; }

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Serialize a Tree
by 张炜 08 Jul '09

08 Jul '09

i want to serialize a self-defined tree to a binary file and vice-versa. The data structure is as follows: class Node { public: Node(); Node(int type,const string &name); ~Node(); string getNodeName(); int getNodeType(); Node *getNodeParent(); bool setNodeName(string &name); bool setNodeType(int type); bool setNodeParent(Node *parent); ............................................................. private: friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & type; ar & name; } int type; string name; Node *parent; public: vector<Node *> children; // children list of current node vector<AttribNode *> attribList; // attribute list of current node }; class AttribNode { public: AttribNode(); AttribNode(string attribName,int attribType,const char* value); string getAttribName(); int getAttribType(); private: friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & name; ar & type; ar & asciiValue; ar & binSize; } string name; int type; string asciiValue; long binSize; char *binValue; }; the difficult is how to serialize the relation between different Nodes.and the binValue. while in the memory, there has a tree.the save function is as follows: bool ConfigRegistry::saveConfigTreeToLocal() { ofstream ofs("D:\\Config.bin",ios::binary); boost::archive::binary_oarchive oa(ofs); queue<Node *> nodeQueue; nodeQueue.push((Node *)root); while(!nodeQueue.empty()) { Node * temp = nodeQueue.front(); for (int i = 0;i < temp->children.size();i++) { nodeQueue.push(temp->children.at(i)); } oa << *temp; int attribNum = temp->attribList.size(); oa << attribNum; for(int i =0;i < temp->attribList.size();i++) { oa << *(temp->attribList.at(i)); if (temp->attribList.at(i)->getAttribType() == ATTRIBUTE_TYPE_BINARY) { char * ptr = temp->attribList.at(i)->binValue; long size = temp->attribList.at(i)->binSize; oa << ptr[size]; } } int childrenNum = temp->children.size(); oa << childrenNum; nodeQueue.pop(); } return true; } bool ConfigRegistry::getConfigTreeFromLocal() { ofstream ifs("D:\\Config.bin",ios::binary); boost::archive::binary_oarchive ia(ifs); int childNum = 0; int attribNum = 0; queue<Node *> nodeQueue; root = (void *)new Node(); Node *curNode = (Node *)root; nodeQueue.push(curNode); while(!nodeQueue.empty()) { ia >> *(curNode); ia >> attribNum; while(attribNum--) { AttribNode * attribNode = new AttribNode(); ia >> *attribNode; if (attribNode->getAttribType() == ATTRIBUTE_TYPE_BINARY) { attribNode->binValue = new char[attribNode->binSize]; ia >> attribNode->binValue; } else { attribNode->binValue = NULL; attribNode->binSize = 0; } curNode->attribList.push_back(attribNode); } ia >> childNum; while (childNum--) { Node * newNode = new Node(); curNode->addChild(newNode); nodeQueue.push(newNode); } nodeQueue.pop(); curNode = nodeQueue.front(); } return true; } the saveConfigTreeToLocal() is okay. but the getConfigTreeFromLocal() is error.y? how can i serialize the self-defined tree above?

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PDF of 1.39.0 documentation available?
by Ingolf Steinbach 08 Jul '09

08 Jul '09

Hi, is the documentation for release 1.39.0 available as PDF for download? (Maybe I have overlooked it on the web page...) Kind regards Ingolf

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unit test: apply same test case to different fixtures
by Hicham Mouline 08 Jul '09

08 Jul '09

I have auto test cases that can take fixtures whose members they access in a uniform way. Say struct F1... Fn BOOST_FIXTURE_TEST_CASE( test_case1 , F1 ... Fn ) { //same code for all Fi } Is there a way to do this? Regards,

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Boost Test - Customize output.
by mik 08 Jul '09

08 Jul '09

Hi all, I'm using Boost::Test to build a regression test of a library and it's working well. But I'd like to customize the output. For example, I get: c:/REPOSI~1/Stable/pdglib/libs/forex/OPTION~1/test/src/option_test_case.cpp(83): error in "option_test_case::regression": american (38) - reference lib (foreign_rho): -1.#IND new lib (foreign_rho): 0 The information about the file and number of line are unnecessary. How can I suppress it? And is it possible to customize the final report too? Thank you, Mirko Cambi

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[Boost.Test] C++ Unit Tests with Boost.Test, Part 1
by legalize+jeeves＠mail.xmission.com 08 Jul '09

08 Jul '09

[Please do not mail me a copy of your followup] <http://legalizeadulthood.wordpress.com/2009/07/04/c-unit-tests-with-boost-t…> In this post, I will describe how to start making unit tests in C++ with Boost.Test. -- "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download <http://www.xmission.com/~legalize/book/download/index.html> Legalize Adulthood! <http://legalizeadulthood.wordpress.com>

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functional/hash and mp_math weirdness
by Andrea Bedini 07 Jul '09

07 Jul '09

Hello, I'm experiencing troubles with functional/hash #include <boost/functional/hash.hpp> #include <boost/mp_math/integer.hpp> typedef boost::mp_math::integer<> big_integer; class A { friend A operator*( const big_integer& lhs, const A& rhs ) {} }; gives the following madness. What surprises me is that I am not making any use of functional/hash (in the actual code, it gets included from boost/unordered_map.hpp), as the error messages don't indicate any line of my code. I think mp_math is not playing a big role here, once I had the same problem with a homemade class (but unfortunately I can't now replicate the same conditions). Can anyone explain me what is going on here ? Thanks you all in advice, Andrea /home/andrea/boost_1_39_0/boost/integer/static_log2.hpp: In instantiation of 'boost::detail::static_log2_impl::static_log2_impl<2ul, 16>': /home/andrea/boost_1_39_0/boost/integer/static_log2.hpp:117: instantiated from 'boost::static_log2<2ul>' /home/andrea/boost_1_39_0/boost/functional/hash/detail/hash_float.hpp:150: instantiated from 'size_t boost::hash_detail::float_hash_impl(T) [with T = float]' /home/andrea/boost_1_39_0/boost/functional/hash/detail/hash_float.hpp:187: instantiated from 'size_t boost::hash_detail::float_hash_value(T) [with T = float]' /home/andrea/boost_1_39_0/boost/functional/hash/hash.hpp:304: instantiated from here /home/andrea/boost_1_39_0/boost/integer/static_log2.hpp:89: error: 'boost::detail::static_log2_impl::static_log2_impl<2ul, 16>::<anonymous enum>' is/uses anonymous type /home/andrea/boost_1_39_0/boost/integer/static_log2.hpp:89: error: trying to instantiate 'template<class Type> template<class T1> boost::mp_math::integer::integer(const T1&)' /home/andrea/boost_1_39_0/boost/integer/static_log2.hpp: In instantiation of 'boost::detail::static_log2_impl::static_log2_impl<2ul, 8>': /home/andrea/boost_1_39_0/boost/integer/static_log2.hpp:89: instantiated from 'boost::detail::static_log2_impl::static_log2_impl<2ul, 16>' /home/andrea/boost_1_39_0/boost/integer/static_log2.hpp:117: instantiated from 'boost::static_log2<2ul>' /home/andrea/boost_1_39_0/boost/functional/hash/detail/hash_float.hpp:150: instantiated from 'size_t boost::hash_detail::float_hash_impl(T) [with T = float]' /home/andrea/boost_1_39_0/boost/functional/hash/detail/hash_float.hpp:187: instantiated from 'size_t boost::hash_detail::float_hash_value(T) [with T = float]' /home/andrea/boost_1_39_0/boost/functional/hash/hash.hpp:304: instantiated from here /home/andrea/boost_1_39_0/boost/integer/static_log2.hpp:89: error: 'boost::detail::static_log2_impl::static_log2_impl<2ul, 8>::<anonymous enum>' is/uses anonymous type /home/andrea/boost_1_39_0/boost/integer/static_log2.hpp:89: error: trying to instantiate 'template<class Type> template<class T1> boost::mp_math::integer::integer(const T1&)' ... ...

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