- Boost-users - lists.boost.org

Re: [Boost-users] [Serialization] issue withportable_binary_oarchive
by Pfligersdorffer, Christian 03 Apr '07

03 Apr '07

boost-users-bounces(a)lists.boost.org wrote: > Hi, > I have switched all the 0 pointer cases to use some Null object. > Now everything works fine. > Thanks very much for your help. > > One last (I hope) question: > > The compilation of this archive produce some compilation > warnings, how can I avoid it ? > > Thanks again, > Dan Leibovich Dear Dan & Robert, I read this thread with very much interest since I want to use the portable binary archive too. Could you please share your experience and especially the code of the version that actually works? Did you also add code to treat floating point types? Yours sincerely, -- DI Christian Pfligersdorffer Software Engineering EOS GmbH

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[serialization] Serialize function pointers
by Sohail Somani 03 Apr '07

03 Apr '07

Hi, Is it possible to serialize function pointers? I'm trying to serialize this guy: struct f { typedef void(*function_t)(); function_t the_ptr_; }; Thanks, Sohail

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[wave::token_type] Checking if the token_type instance is empty
by Ovanes Markarian 03 Apr '07

03 Apr '07

Hello Hartmut, I have a question and may be small interface change to the token_type. Currently there is no "legal" way to check if a token type instance is empty, than using token_id operator and comparing it with T_EOI (which is not really documented, available in the header and default ctor of impl::token_data only). Why did I need it: I have a state machine class which preserves the look ahead. Now when I construct the state machine, the look ahead is default constructed. In particular states I have to distinguish if there is look ahead available or not and take some actions accordingly. Now I would need to rely on the following comparison: BASEID_FROM_TOKEN(T_EOI)==tok.operator token_id(); Instead it would be more flexible to write tok.empty(). I am not sure if this convinces you, but at least T_EOI should be documented (I am still using old documentation 1.33.1). The docs should also state that empty token has this type. On the other hand I don't know where else T_EOI is used and how to distinguishe this case then. I would appreciate the empty member function, which can greatly ease the life ;) With Kind Regards, Ovanes Markarian

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[guid] create_random_based and create_name_based
by Christian Henning 03 Apr '07

03 Apr '07

Hi there, I just downloaded guid_v6 from the vault. Seems that there is mix up in both create functions. The random version is calling create_name_based and vice versa. Reagrds, Christian

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identify boost thread
by Goroll, Torsten 03 Apr '07

03 Apr '07

Hi, I'm looking for a way, to identify a boost::thread from inside the thread. The background is, that I want to log into a global logger, which has to know from which thread the message was sent. I have thought at using the pointer of the class as an identifier, but that won't work if two threads are from the same class. Maybe it is possible to save a pointer to the member methods??? Kind Regards Torsten

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string_algo no erase_if
by gast128 03 Apr '07

03 Apr '07

Dear all, I was trying to remove (replace, find...) characters from a string through the handy classification class. Unfortunately there is no erase_if fct which can be fed with this predicate functions. There is a trim_if function, but this trims only. It would be handy if all these '_if' variants where implemented for find, repalce and erase. Also the 'any' (or contains_if with predicate) is something we need regularly. But maybe this functionality can be achieved in another way. Anyone an idea? Remove_if/erase combination does of course work, but these are quite cumbersome. Wkr, me

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checked_delete, shared_ptr, and incomplete types...
by Graham Reitz 03 Apr '07

03 Apr '07

I was toying with the example in "Beyond the C++ Standard Library An Introduction to Boost", Library 3:Utility. Specifically, the section on using checked_delete(). On page 85 it mentions that, "It can be easy to get into this kind of trouble with smart pointers". I tried the example presented with raw and shared_ptr. The destructor doesn't get called with the raw pointer example (the undefined behavior) but when using shared_ptr with the same example the destructor gets called. What was the author (Bjorn Karlsson) referring to when he mentioned this can be an issue with smart pointers? Thanks, Graham Code: // to_be_deleted.h #include <iostream> class to_be_deleted { public: ~to_be_deleted() { std::cout << "Help me get called.\n"; } }; // deleter.h #include "boost/shared_ptr.hpp" class to_be_deleted; using namespace boost; class deleter { public: //void delete_it(shared_ptr<to_be_deleted> p); void delete_it(to_be_deleted* p); }; // deleter.cpp #include "deleter.h" #include "boost/checked_delete.hpp" void deleter::delete_it(to_be_deleted* p) //void deleter::delete_it(shared_ptr<to_be_deleted> p) { delete p; //boost::checked_delete(p); } // main.cpp #include "boost/shared_ptr.hpp" #include "deleter.h" #include "to_be_deleted.h" using namespace boost; // Forces the type being deleted to be known at compile time int main(int argc, char* argv[]) { { //shared_ptr<to_be_deleted> p(new to_be_deleted()); to_be_deleted* p = new to_be_deleted; deleter d; d.delete_it(p); } return 0; }

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Boost Con
by Robert Marion 02 Apr '07

02 Apr '07

So, attending the Boost Con in May is no trivial task. Aside from the $599 (early bird) conference cost and the hotel, you have to fly to Denver and then drive about 200 miles to Aspen -- because the airport in Aspen is closed in May (no kidding). I'm tempted to go just because the place will be nearly uninhabited. Dudes, what gives? Robert

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Tokenizer - remainder of parsed string
by Gleske, Paul GOSS 02 Apr '07

02 Apr '07

I have a situation where I want to parse off the first few fields of a message and then return the rest of the message. The message format is: <STX>field1,field2,field3,field4,field5,field6,field7,field8,field9<ETX> What I want to do is pull off the first 5 fields and then get at the remainder of the string (fields 6-9) as a single string. I've pieced together something that mostly works It leaves me with a remainder of ",field6,field7,field8,field9". Note the leading comma. ----------------- std::string str = "\x02" "field1,field2,field3,field4,field5,field6,field7,field8,field9" "\x03"; typedef boost::tokenizer<boost::char_separator<char> > tokenizer; boost::char_separator<char> sep(",\x02\x03"); tokenizer tokens(str, sep); tokenizer::iterator tok_iter = tokens.begin(); for (int i=1; tok_iter != tokens.end(); tok_iter++) { std::cout << "<" << *tok_iter << "> "; ++i; if (i > 5) break; } std::cout << "\n"; std::cout << "current token <" << tok_iter.current_token() << ">"; std::cout << "\n"; boost::char_separator<char> sep2("\x03"); tokenizer remainder(tok_iter.base(), str.end(), sep2); std::cout << "<" << *remainder.begin() << ">" << "\n"; ----------------- What I don't understand is what the tok_iter.base() returns, or how the tokenizer constructor that uses it works (see the line for remainder). How can that constructer take tok_iter.base() and str.end()? Is the string iterator converted? Is there a better way to get the remainder of the tokenized string? I would very much like to not have the leading comma on the remainder. I know I can use substr on the remainder, but it seems that there should be a better way. Thanks, -pkg -------------------------------------------------------- Goss ... Innovation for Business NOTICE: This e-mail and any attachment(s) may contain confidential and proprietary information of Goss International Corporation and/or its subsidiaries and may be legally privileged. This e-mail is intended solely for the addressee. If you are not the addressee, dissemination, copying or other use of this e-mail or any of its content is strictly prohibited and may be unlawful. If you are not the intended recipient please inform the sender immediately and destroy the e-mail and any copies. All liability for viruses is excluded to the fullest extent permitted by law. Any views expressed in this message are those of the individual sender. No contract may be construed by this e-mail.

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Boost and WXwidgets
by Lucas de Sales Joner 02 Apr '07

02 Apr '07

Hi, I have a program that use boost library (matrix, vector and others) and return a vector and I need plot this vector with wxwidgets. The problem is that I can´t use wxwidgets with boost library because return a lot of problems. My plot program work well, but when I use "include<boost/numeric/ublas/matrix.hpp>" in that program, return this errors: C:\Arquivos de programas\Dev-Cpp\include\boost\numeric\ublas\storage.hpp:25, from C:\Arquivos de programas\Dev-Cpp\include\boost\numeric\ublas\vector.hpp In file included from C:/Arquivos de programas/Dev-Cpp/include/boost/numeric/ublas/storage.hpp:25, from C:/Arquivos de programas/Dev-Cpp/include/boost/numeric/ublas/vector.hpp C:\Arquivos de programas\Dev-Cpp\include\boost\numeric\ublas\exception.hpp In member function `void boost::numeric::ublas::bad_argument::raise()': C:\Arquivos de programas\Dev-Cpp\include\boost\numeric\ublas\exception.hpp exception handling disabled, use -fexceptions to enable How can I use wxwidgets and boost library? Someone know other way to plot points in using boost? LUCAS DE SALES JONER Engenharia de Controle e Automação Industrial - UFSC Laboratório de Robotica - UFSC ionner_rs(a)hotmail.com ionner.rs(a)gmail.com (48) 9148 4732 _________________________________________________________________ Veja só alguns dos novos serviços online no Windows Live Ideas — são tão novos que ainda não foram disponibilizados oficialmente. http://ideas.live.com

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