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[Uuid] Portable binary serialization.
by Mostafa 12 Mar '10

12 Mar '10

I'm interested in using the portable binary serialization code in [serialization]/example directory with Boost.Uuid. I've noticed that there's a fall back template function for unrecognized types in portable_binary_iarchive.hpp: 101 // default fall through for any types not specified here 102 template<class T> 103 void load(T & t){ 104 boost::intmax_t l; 105 load_impl(l, sizeof(T)); 106 // use cast to avoid compile time warning 107 t = static_cast<T>(l); 108 } that relies on the sizeof operator. Short of replacing the sizeof operator with a templated switch: //Code Sample 1 //Start code template <typename T> std::size_t my_size_of { return sizeof(T); } tempate <> std::size_t my_size_of<boost::uuids::uuid> { return boost::uuids::uuid::static_size(); } //End code or using macros ala: //CodeSample 2 //Start template <typename T> std::size_t my_size_of(T const & t) { return sizeof(T); } tempate <> std::size_t my_size_of<boost::uuids::uuid>(boost::uuids::uuid const &) { return boost::uuids::uuid::static_size(); } #define sizeof(x) my_size_of(x) #include <boost_portable_binary_serialization> #undef sizeof //End , is their something less instrusive I could do to make it work with Boost.Uuid? Thanks, Mostafa

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uBlas with Atlas
by Kraus Philipp 12 Mar '10

12 Mar '10

Hello, I try to install the numerical bindings for my boost, but I can't compile the examples. I had installed and compilde the Atlas Lib 3.9.23 with Lapack support and the Boost 1.42 with MPI Support under OS X Leo. I take a look at http://www.opentissue.org/wikitissue/index.php/Boost_bindings but I had checked out the bindungs with and without the -v1 prefix and try to compile the examples under the lib directory. How can I work with the boost uBlas structures and the Atlas lib, so I can use the Cholesky factorisation with a uBlas matrix? Can you help me to install the bindings correctly? Thanks Phil

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storing pointers in a std::map
by Alan Tennant 12 Mar '10

12 Mar '10

I'm having difficulty storing pointers in a std::map. I can't find anything online about it, are std::maps supposed to be able to store pointers?

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Re: [Boost-users] [asio] Callbacks not getting called
by Tom Kent 12 Mar '10

12 Mar '10

So, I tried it, but surprisingly, it didn't make any difference. I'm not sure why there wasn't an error, it seems like one of HandleAccept and &HandleAccept would cause some type of error. Also, I'm not having the problem getting through the acceptor. The server successfully gets the accept callback for the connection from the client (and the client gets its callback as well). Its the aysnc_send/async_read that doesn't ever get a callback. I tried using the reference to HandleAccept in those as well, but like I said above, saw the *exact* same results. Tom -------- Original Message -------- Subject: Re: [Boost-users] [asio] Callbacks not getting called From: Rutger ter Borg (rutger_at_[hidden]) Date: 2010-03-11 16:55:43 Tom Kent wrote: > acceptor_->async_accept(*sock1_, HandleAccept); Perhaps you could try acceptor_->async_accept(*sock1_, &HandleAccept); here? Cheers, Rutger

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boost::filesystem directory_iterator: how to get the last file of a directory ?
by Vial, Florent 12 Mar '10

12 Mar '10

Hi boost-users, I am using a recursvive function for iterating over a starting path. When i finally arrive in a directory that contains no subdirectory (what i call a "final" directory), i want to retrieve the first and the last file of this directory. I succeed in retrieving the first file of the final directory (see code snippet below), But i do not know how to retireve the last one using the same directory iterator. Can someone think of an elegant solution ? ------------------ CODE BEGIN ------- namespace fs = boost::filesystem; void my_function (const fs::path &ph) { bool firstFileOfFinalDir = false; if (fs::is_directory(ph)) { fs::directory_iterator end_iter; for (fs::directory_iterator dir_itr(ph); dir_itr != end_iter; ++dir_itr) { if (fs::is_directory(dir_itr->status())) { // Recursive call my_function(fs::path(dir_itr->path())); } else { // We are in a "final" directory if (fs::is_regular_file( dir_itr->status())) { if (firstFileOfFinalDir) { // Do something with the first file of the final directory firstFileOfFinalDir = false; } else { // My problem : how to check if // dir_itr == (end_iter - 1) // i.e. if it is the last valid value ? } } } } } } ------------------ CODE END ------- Thank you in advance for your help, Florent Be a part of filmmaking's exciting future today by registering your intent to purchase on: www.arridigital.com Arnold & Richter Cine Technik GmbH & Co. Betriebs KG Sitz: Munchen - Registergericht: Amtsgericht Munchen - Handelsregisternummer: HRA 57918 Personlich haftender Gesellschafter: Arnold & Richter Cine Technik GmbH Sitz: Munchen - Registergericht: Amtsgericht Munchen - Handelsregisternummer: HRB 54477 Geschaftsfuhrer: Franz Kraus; Dr. Martin Prillmann

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Nested regex results with xpressive.
by Surya Kiran Gullapalli 12 Mar '10

12 Mar '10

Hello all, I'm trying to match a string with xpressive. The match is fine, but the nested results doesn't seem to be working. The code is here<http://pastebin.com/TLSiRMRh> my regex *combinedReg* is made up of 3 sregex objects. Two of them store the results using mark_tag objects. When I try to match the string, I get a complete match and toplevel match says it has 3 nested results. Which is correct. When I try to loop over those three nested results for more nested results, I get nothing. what am I doing wrong? Thanks in advance, Surya

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[fusion] transform & iterators
by David A. Greene 12 Mar '10

12 Mar '10

For the first attached testcase, can anyone explain why "Doesn't" doesn't? I would not expect the second test to compile. But is there some way to bridge the gap between fusion iterators, boost.Range ranges and standard iterators? Is there any way to turn a fusion iterator into a standard- conforming iterator? -Dave

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matrix iterator each element
by Kraus Philipp 12 Mar '10

12 Mar '10

Hello, I have very large matrices (not sparse), where I have to change each element. From the documentation I used the example with which two for-loops. I use for vectors: blas::vector<T> l_vec = p_vec; BOOST_FOREACH( T& i, l_vec) i = std::pow(i, p_exponent); Is there any way to process each element in the matrix with a loop and an iterator? Thanks Phil

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boost::regex on to match in the middle of a string
by Conoscenza Silente 12 Mar '10

12 Mar '10

Hi All I am newbie to boost::regex. I have a string including multiple new lines characters in it like the one below. "this is a big string\nthat I would like\ntoParse here: WORD_TO_FIND=Ciao\nin the middle" I tried the following regex but it doesn't match. boost::regex ln0("WORD_TO_FIND=\t(?<SYMBOL>\\w+).+", boost::regex::perl ); Do you know what is the option and how to set it up to enable the matching for an entire string and not line by line? Thanks

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permutation_iterator documentation error
by Paul 12 Mar '10

12 Mar '10

I tried to enter this into the bug database, but it said "Database Locked" http://www.boost.org/doc/libs/1_42_0/libs/iterator/doc/permutation_iterator… this: ElementIterator const& base() const; should read: IndexIterator const& base() const;

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