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[Gil] TIFF file with mixed 8/16 bit channel depths
by Corinna Kinchin 03 Nov '11

03 Nov '11

Hello, I'm using boost::gil::read_image(in, img, tiff_tag()); as part of a process to extract raw image data from a TIFF file, and it works beautifully for cmyka TIFF files containing either 5 x 8-bit channels, or 5 x 16-bit channels. But it seems using this technique mangles image data contained in a (photoshop generated) TIFF file which contains CMYK channels with both 8 and 16 bit depths (mixed). Here is an extract from the ImageMagick 'identify -verbose' output on such a file: Depth: 8/16-bit Channel depth: cyan: 16-bit magenta: 16-bit yellow: 16-bit black: 8-bit alpha: 8-bit It seems that read_image treats the TIFF file as if it contains 5 x 8-bit channels (the TIFFTAG_BITSPERSAMPLE property and hence the _bits_per_sample info value for the TIFF file is set to 8), so the CMY channel image data isn't read in correctly ... at least that's my best guess. Does anyone out there know whether boost::gil can be made to support 8/16bit TIFF files - eg if there's an extension (or hack ;) which could do the trick? Or any other options (eg other libraries) which could be worth investigation? Many thanks for reading this far, and if you have any remotely relevent ideas it would be great to hear them ... All the best, Corinna ... Corinna Kinchin email: ckinchin(a)datazone.com Datazone Ltd. Tel: +353 64 66 28964 Palm Gate, Greenane, Fax: +353 64 66 28965 Killarney, Co. Kerry, Ireland URL: http://www.miramo.com Datazone - makers of `Miramo', the automated publishing tool

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MSVC++ 2010 and BOOST_STATIC_ASSERT
by Sunil Thomas 03 Nov '11

03 Nov '11

Hi all! I've noticed that MSVC++ 2010 has implemented static_assert (compile time checks); and probably as a result, the code that used to build fine in MSVC++ 2008 is now generating the following error. code: BOOST_STATIC_ASSERT(N==1) *error C2338: (N==1)* ** Appreciate if anyone who has resolved this error can share their experiences.. Thanks, --Thomas. **

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Boost.Pool: Writing a base class for per-class pool allocation
by Freddie Witherden 03 Nov '11

03 Nov '11

Hi all, I am currently trying to write a base class which overloads new and delete so that they allocate from a boost pool: template<typename T> class pool_object { public: static void* operator new(size_t) { return pool_.malloc(); } static void operator delete(void *p) { pool_.free(p); } private: static boost::pool<> pool_; }; template<typename T> boost::pool<> pool_object<T>::pool_(sizeof(T)); The idea is that one can write: class foo : public pool_object<foo> { ... }; The problem with this is that boost::pool is not thread-safe. The thread-safe variant is a singleton pool. However, this is parametrized by a size: boost::singleton_pool<sizeof(T)> -- which is a problem as T is incomplete. Are there any solutions other than sticking my own mutex into the class? Regards, Freddie.

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[RapidXML] Cannot open XML files unless in main
by Alec Taylor 03 Nov '11

03 Nov '11

Good afternoon, Unfortunately only my 10 lines [main only]: http://ideone.com/WOmcphowever works, whilst my 20 lines [OO with functions] doesn't: http://ideone.com/R7mir How can I get this to work? I am aware that boost property tree wraps RapidXML... so maybe you can help me out here? Thanks for all suggestions, Alec Taylor

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boost.mpi serialization... error?
by Jacques C. Richard 02 Nov '11

02 Nov '11

I am trying boost::mpi on a big code & getting the following error message from mac mpiC++ (same from an intel super-computer). Can anyone pick out something quickly from that to help please or do you need to see more? I'd like to figure out what I did to not do it! :) Thanks! Jacques Process=1's mpe_decomp1d MiniGridSize= 3 3 3 Pause @ "main: 879: Domain decomposition" if 1 process: <Enter> or <Return> continues; ^C aborts: init_internal_neighbors_wf: Process 1 of 2 exchanging (if necessary) w/+/-1! Sender=1, Receiver=0 [jacques-richards-mac-mini:00474] *** Process received signal *** [jacques-richards-mac-mini:00474] Signal: Segmentation fault (11) [jacques-richards-mac-mini:00474] Signal code: Address not mapped (1) [jacques-richards-mac-mini:00474] Failing at address: 0x200000001 [jacques-richards-mac-mini:00474] [ 0] 2 libSystem.B.dylib 0x00007fff86fa51ba _sigtramp + 26 [jacques-richards-mac-mini:00474] [ 1] 3 ??? 0x0000000000000000 0x0 + 0 [jacques-richards-mac-mini:00474] [ 2] 4 Mg 0x000000010010ff0e _ZN5boost3mpi6detail24ignore_skeleton_oarchiveINS1_16content_oarchiveEE13save_overrideIP12lattice_typeEEvRKT_i + 40 [jacques-richards-mac-mini:00474] [ 3] 5 Mg 0x000000010010ff3a _ZN5boost7archive6detail18interface_oarchiveINS_3mpi6detail16content_oarchiveEElsIKP12lattice_typeEERS5_RT_ + 42 [jacques-richards-mac-mini:00474] [ 4] 6 Mg 0x000000010010ff6e _ZNK5boost13serialization3nvpIKP12lattice_typeE4saveINS_3mpi6detail16content_oarchiveEEEvRT_j + 40 [jacques-richards-mac-mini:00474] [ 5] 7 Mg 0x000000010010ff93 _ZN5boost13serialization6access1 ... .. .

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Re: [Boost-users] [BGL] How to provide a vertex_index property for my graph
by gongyiling 02 Nov '11

02 Nov '11

"ShNaYkHs ShNaYkHs" 写入消息 news:CA+GAXM2Kt7KjUamMuXUeo2_SL-GTWg0k2UjerJTNQi7sizUipQ@mail.gmail.com... > Hello, > Since my graph use setS as a VertexList, I have to either provide a > vertex_index property map for my graph to be able to use some functions > requiring a vertex_index (e.g. write_graphviz). My graph is defined as: > typedef adjacency_list<setS, setS, undirectedS, NodeData, EdgeData> Graph; > Where NodeData and EdgeData are structures. Can you please give me a very > simple example of how to provide a vertex_index property map for my graph > ? > I mean, since an adjacency_list that uses listS or setS as the vertex > container does not automatically provide this vertex_id property, how can > I > add it to the code bellow ? > I tried to use an associative_property_map to include index for vertices, > but it doesn't work (errors): > #include <boost/graph/iteration_macros. > hpp> > #include <boost/graph/adjacency_list.hpp> > using namespace std; > using namespace boost; > struct NodeData > { > int label; > float influance; > /* etc ... */ > }; > struct EdgeData > { > int age; > /* etc ... */ > }; > typedef map<vecS, size_t> IndexMap; > IndexMap mapIndex; > associative_property_map<IndexMap> propmapIndex(mapIndex); > typedef adjacency_list<setS, setS, undirectedS, NodeData, EdgeData> Graph; > typedef Graph::vertex_descriptor NodeID; > typedef Graph::edge_descriptor EdgeID; > int main() > { > Graph g; > NodeID n0 = add_vertex(g); g[n0].label = -1; > NodeID n1 = add_vertex(g); g[n1].label = -1; > EdgeID edge; bool ok; > tie(edge, ok) = boost::add_edge(n0, n1, g); > if (ok) g[edge].age = 10; > int i=0; > BGL_FORALL_VERTICES(v, g, Graph) > { > put(propmapIndex, v, i++); > } > return 0; > } > Thanks for answer. -------------------------------------------------------------------------------- you can using vertex bundle property as you vertex index, here is the code I modified according to above: #include <boost/graph/iteration_macros.hpp> #include <boost/graph/adjacency_list.hpp> using namespace std; using namespace boost; struct NodeData { int label; float influance; int index; //add by gyl /* etc ... */ }; struct EdgeData { int age; /* etc ... */ }; typedef adjacency_list<setS, setS, undirectedS, NodeData, EdgeData> Graph; typedef Graph::vertex_descriptor NodeID; typedef Graph::edge_descriptor EdgeID; int main() { Graph g; NodeID n0 = add_vertex(g); g[n0].label = -1; g[n0].index = 0; //add by gyl, init index 0. NodeID n1 = add_vertex(g); g[n1].label = -1; g[n1].index = 1; //add by gyl, init index 1. EdgeID edge; bool ok; tie(edge, ok) = boost::add_edge(n0, n1, g); if (ok) g[edge].age = 10; int i=0; BGL_FORALL_VERTICES(v, g, Graph) { put(boost::get(&NodeData::index, g)/*by gyl get bundle property map*/, v, i++); } return 0; } at last, I think you should post this to boost.user maillist instead here. _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost

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[regex] why partial match / early break ?
by U.Mutlu 01 Nov '11

01 Nov '11

Hi, why is this regex const string sRe = "((([a-zA-Z]|([a-zA-Z][a-zA-Z0-9\\-]))+[a-zA-Z0-9])\\.)+" "((([a-zA-Z]|([a-zA-Z][a-zA-Z0-9\\-]))+[a-zA-Z0-9]))"; not matching this string wholly? "a1a.a2a.a3a.a4aaaa" It rather matches only this part: "a1a.a2a.a3a.a4" What's the problem here? (I know I can append a delimiter to solve the problem, but I think the regex should've match it wholly, shouldn't it?)

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transfer_at_least_t
by Carla Strembicke 01 Nov '11

01 Nov '11

Hi, I have an object of transfer_at_least_t. I would like to find out what the minimum value is due to the fact that my app that set it is requiring so many bytes of unencrypted data, and the transfer is including the encryption. Is there any interface that can get this value or do I have to store it before I create the object transfer_at_least_t? Carla Strembicke Software Developer [cid:image015772.JPG@7ddd0ff8.4ca8ab2e] SUBNET Solutions Inc. www.SUBNET.com<http://www.SUBNET.com/> Making Substations More Intelligent T: 403.270.8885 F: 403.270.9631 #100, 4639 Manhattan Road SE, Calgary, Alberta, Canada; T2G 4B3 CONFIDENTIAL INFORMATION NOTICE: The information contained in this e-mail is privileged, confidential and intended solely for the use of the addressee named above. If the reader of this e-mail is not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this e-mail is strictly prohibited. If you received this in error, please contact the sender and destroy all copies of this e-mail. Thank you.

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using a boost::shared_mutex in a share_ptr
by Sean Farrow 01 Nov '11

01 Nov '11

Hi: I have the following variable declared in a class: Boost::shared_ptr<boost;:shared_mutex> If I have a standard boost::shared_mutex, I can pass this to a shared or unique lock. How do I pass a boost::shared_ptr<boost::shared_mutex> to a lock? This is probably really simple, but I carn't fathum it out! Cheers Sean.

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serialization of a ptr
by Jonathan Bishop 01 Nov '11

01 Nov '11

How do I prevent boost::serialize from treating a pointer as an object and serializing the object. I have written the specialization of save/load for the object pointer. I get the following errors when I attempt to compile the program below... boost/serialization/access.hpp: In static member function 'static void boost::serialization::access::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::binary_oarchive, T = X]': boost/serialization/serialization.hpp:81: instantiated from 'void boost::serialization::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::binary_oarchive, T = X]' boost/serialization/serialization.hpp:140: instantiated from 'void boost::serialization::serialize_adl(Archive&, T&, unsigned int) [with Archive = boost::archive::binary_oarchive, T = X]' boost/archive/detail/oserializer.hpp:151: instantiated from 'void boost::archive::detail::oserializer<Archive, T>::save_object_data(boost::archive::detail::basic_oarchive&, const void*) const [with Archive = boost::archive::binary_oarchive, T = X]' s3.cpp:53: instantiated from here boost/serialization/access.hpp:109: error: 'class X' has no member named 'serialize' ============================================================================================== #include <fstream> #include <sstream> #include <cstddef> #include <boost/archive/binary_iarchive.hpp> #include <boost/archive/binary_oarchive.hpp> #include "boost/serialization/split_free.hpp" using namespace std; class X { X(const X& other); X& operator=(const X& other); public : static X* get(int id); X() : id(0) {} int id; }; // Non-intrusive serialization (pretend I am not able to modify class X) // I was hoping serialization would use this specialization // archive X by id template<class Archive> void save(Archive& ar, X*& x, unsigned int version) { int id = x->id; ar & id; } // load X by lookup template<class Archive, class T> void load(Archive& ar, X*& x, unsigned int version) { int id; ar & id; x = X::get(id); } template<class Archive, class T> inline void serialize(Archive& ar, X*& t, const unsigned int version) { split_free(ar, t, version); } int main() { X x; std::ofstream ofs("junk"); boost::archive::binary_oarchive oa(ofs); oa & x; ofs.close(); return 0; }

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