August 2006 - Boost-users - lists.boost.org

Re: [Boost-users] Ownership of Boost IP?
by Nat Goodspeed 08 Aug '06

08 Aug '06

________________________________________ From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Gottlob Frege Sent: Tuesday, August 08, 2006 3:20 PM To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] Ownership of Boost IP? > The reasoning appears to be that some party might claim that an > individual developer, perhaps unknowingly, submitted code that > rightfully belongs to his employer. the employer would then sue > anyone who has ever incorporated the affected Boost library into their > own products. Of course there are many other scenarios, but in the above scenario, it was the employEE's fault, thus the employER's fault, thus they can't go around suing everyone. [Nat] I love the way you think. :-) Thanks.

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[asio][iostream] trying to implement nntp-client
by Sascha Seewald 08 Aug '06

08 Aug '06

Hi Boosters, I´m playing around with the great boost::asio library but have problems using the boost::asio::ip::tcp::iostream. I try to implement a very simple nntp-client: <code> void connect_and_retrieve_list_of_newsgroups() { std::string line; // connect to server boost::asio::ip::tcp::iostream s("news.gmane.org", "nntp"); if (!s) return; // read connection ack std::getline(s, line); // log std::cout << line; // check return code here. we assume everything is fine. // ... // send LIST command to request a list of newsgroups (see rfc 977) // the server will respond with one or more lines s << "LIST\r\n"; // read response std::getline(s, line); // <-- waits here 'til server timeout ... } </code> For some reason I don't get a response to the LIST command. After a few minutes of waiting the server send a timeout notification. It is like I had never sent the request. The same code using sockets and asio::write() works ok. So my questions are: - In what way differ tcp::iostreams sending from asio::write() sending? - Do tcp::iostreams append (or convert or drop) any characters of the given string before sending? - Is there a way to gain direct access to tcp::iostreams underlying socket (at least for testing)? - What am I doing wrong? Any help would be much appreciated! Cheers Sascha

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Re: [Boost-users] [array] VC++ 7.1 bug and a proposed fix
by Todd Greer 08 Aug '06

08 Aug '06

Johan Råde wrote: > We aren't actually testing static array initialization, are we? How do we > know that it works at all? :-) I can think of two tests that might be useful. I haven't had a chance to try either one yet. After adding in the appropriate #includes and namespace qualification, and following whatever the standard Boost test construction guidelines are, do these look like they would do the job? 1. Test that it is POD: struct x {}; BOOST_STATIC_ASSERT(!is_pod<x>::value || is_pod<array<int> >::value) On most compilers, is_pod always yields false for structs, and this test should pass, but is useless. On those compilers for which is_pod works on structs, this test will pass iff array<int> is a POD. 2. Test that it gets statically initialized: test_static_initialization.h: extern array<int> a; extern array<int> b; extern bool a_is_initialized; extern bool b_is_initialized; a.cpp: #include "test_static_initialization.h" array<int> a = { 1 }; bool const b_is_initialized = b[0] == 1; b.cpp: #include "test_static_initialization.h" array<int> b = { 1 }; bool const a_is_initialized = a[0] == 1; test_static_initialization.cpp: #include "test_static_initialization.h" int main() { assert(a_is_initialized); assert(b_is_initialized); } What do you think? -- Todd Greer <tgreer (at) affinegy {dot} [com]>

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Ownership of Boost IP?
by Nat Goodspeed 08 Aug '06

08 Aug '06

My employer's legal department has just stated that we may not use Boost for product development because of a hypothetical lawsuit risk. The reasoning appears to be that some party might rise up and claim that parts of one or more Boost libraries actually belong to it: that an individual developer, perhaps unknowingly, submitted code that was not his to give away because it rightfully belongs to his employer. In this horrid fantasy, the employer would then sue many parties, including anyone who has ever incorporated the affected Boost library into their own products. The SCO lawsuits make it tough to dismiss such arguments out of hand. This is disturbing on a number of levels. I want to marshal whatever counterarguments I can quickly assemble. If it states anywhere on the Boost web site that the Boost organization certifies its implementation IP clean... sorry, I wasn't really expecting that. But anything whatever that would bolster the case against this paranoia would be extremely helpful. Thank you!

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Re: [Boost-users] [Boost][multi_index] proper way to make a complex query
by JOAQUIN LOPEZ MU?Z 08 Aug '06

08 Aug '06

Sebastien Fortier ha escrito: > I will try to make this as simple as possible, > I have the following struct > > struct meteo_record { > public: > [...ctor...] > [...getters and setters...] > private: > string var_name; > string grid_type; > float ip1; > float ip2; > float ip3; > float ig1; > float ig2; > float ig3; > int ip1Kind; > int data_key; > }; > > All these attributes are non-unique except for the data_key > which is not a sorting criteria. > > What I need to do is to be able to iterate over the whole > set by certain criteria. [...] > my criterias are > sort by same gryd_type group by var_name with same ip2 and > same ip1kind ordered on ip1 [...] Hello Sebastien, I'm not sure I've fully understood all the details of your problem, but seems to me that composite keys ( http://tinyurl.com/hdf3q ) might be of help here. A composite key accepts several attributes and presents the records sorted in lexicographical order with respect to them. In your particular case, suppose you've got an index (non-unique) whose key is composite_key< meteo_record, const_mem_fun<meteo_record,const string&,&meteo_record::get_grid_type>, const_mem_fun<meteo_record,const string&,&meteo_record::get_var_name>, const_mem_fun<meteo_record,float,&meteo_record::get_ip2>, const_mem_fun<meteo_record,int,&meteo_record::get_ip1Kind>, const_mem_fun<meteo_record,float,&meteo_record::get_ip1> > (where I've used some imaginary names for the attribute getters). This index sorts records lexicographically by grid_type,var_name,ip2,ip1Kind,ip1 which looks like what you're after, from what I understand about the description of your current query process. The different groups can be then traversed like follows (for simplicity I assume the composite key is used in index #0, you'll probably want to have it in an additional index): for(recordIter=set.begin();recordIter!=set.end();) { recordIter2=set.upper_range( boost::make_tuple( it->get_grid_type(), it->get_var_name(), it->get_ip2(), it->get_ipKind(), ) ); // [recorditer1,recorditer2) is a range of elements with equal // grid_type,var_name,ip2 and ipKind, sorted by ip1 process(recordIter1,recordIter2); recordIter1=recordIter2; } Is this what you were looking for? Thank you for using Boost.MultiIndex, Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

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[mpl] - erro if mpl::map ist included
by Oliver.Kowalke＠qimonda.com 08 Aug '06

08 Aug '06

Hello, if I only include (no instantiation) the header <boost/mpl/map.hpp> I get the following error: /opt/boost/include/boost-1_33_1/boost/mpl/map/aux_/iterator.hpp:45: error: template argument 1 is invalid /opt/boost/include/boost-1_33_1/boost/mpl/map/aux_/iterator.hpp:45: error: template argument 1 is invalid /opt/boost/include/boost-1_33_1/boost/mpl/map/aux_/iterator.hpp:48: error: expected `{' before '>' token /opt/boost/include/boost-1_33_1/boost/mpl/map/aux_/iterator.hpp:48: error: expected unqualified-id before '>' token /opt/boost/include/boost-1_33_1/boost/mpl/map/aux_/iterator.hpp:66: error: expected nested-name-specifier before 'item_by_order' /opt/boost/include/boost-1_33_1/boost/mpl/map/aux_/iterator.hpp:66: error: expected ';' before '<' token g++ -v: Using built-in specs. Target: i486-linux-gnu Configured with: ../src/configure -v --enable-languages=c,c++,fortran,objc,obj-c++,treelang --prefix=/usr --enable-shared --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --enable-nls --program-suffix=-4.1 --enable-__cxa_atexit --enable-clocale=gnu --enable-libstdcxx-debug --enable-mpfr --with-tune=i686 --enable-checking=release i486-linux-gnu Thread model: posix gcc version 4.1.2 20060729 (prerelease) (Debian 4.1.1-10) Any suggestion? regards, Oliver

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Re: [Boost-users] [Serialization] Problem serializingviabaseclassptr
by Guy Létourneau 08 Aug '06

08 Aug '06

Hello Robert, Just to let you know that everything works fine now. Thanks for your help, Guy -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Robert Ramey Sent: Monday, August 07, 2006 1:18 PM To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] [Serialization] Problem serializingviabaseclassptr Guy Létourneau wrote: > Hello Robert, > > Sorry for not giving you feedback earlier, I was on vacation. I've > included your proposed changes in my test application but I still get > the same compile error: > > C:/Boost/include/boost-1_33_1/boost/archive/detail/oserializer.hpp: > In function `void boost::archive::save(Archive&, T&) [with Archive = > boost::archive::text_oarchive, T = const A*]': > C:/Boost/include/boost-1_33_1/boost/archive/basic_text_oarchive.hpp:78: > instantiated from `void > boost::archive::basic_text_oarchive<Archive>::save_override(T&, int) > [with T = const A*, Archive = boost::archive::text_oarchive]' > C:/Boost/include/boost-1_33_1/boost/archive/detail/interface_oarchive.hpp:78: > instantiated from `Archive& > boost::archive::detail::interface_oarchive<Archive>::operator<<(T&) > [with T = const A*, Archive = boost::archive::text_oarchive]' > ../main.cpp:101: instantiated from here > C:/Boost/include/boost-1_33_1/boost/archive/detail/oserializer.hpp:567: > error: incomplete type `boost::STATIC_ASSERTION_FAILURE<false>' does > not have member `value' > make: *** [main.o] Error 1 > > Could you tell me what I'm missing? > > Thanks again for your help, > > Guy Letourneau > > > Test application: > > #include <iostream> > #include <fstream> > > #include <boost/archive/text_oarchive.hpp> > #include <boost/archive/text_iarchive.hpp> > #include <boost/serialization/export.hpp> > > class A > { > public: > > A() > { > i = 1; > }; > > virtual ~A() > { > }; > > virtual void Dummy() = 0; > > private: > > int i; > > friend > class boost::serialization::access; > > template <class Archive> > void serialize( Archive& ar, const unsigned int version ) > { > std::cout << "Serialization of A" << std::endl; > std::cout.flush(); > } > }; > BOOST_IS_ABSTRACT(A) > > > class B : public A > { > public: > > B() > { > }; > > virtual ~B() > { > }; > > void Dummy() > { > }; > > void SetValue( std::string& value ) > { > Data = value; > } > > private: > > friend > class boost::serialization::access; > > template <class Archive> > void serialize( Archive& ar, const unsigned int version ) > { > ar & boost::serialization::base_object<A>( *this ); > ar & Data; > std::cout << "Serialization of B" << std::endl; > std::cout.flush(); > } > > std::string Data; > }; > BOOST_CLASS_EXPORT(B) > > > int main() > { > // Create a B object > B* Child = new B; > > // Set some data > std::string Data = "test"; > Child->SetValue( Data ); > > // Assign it to a A ptr **** // > const A* Parent = Child; // Parent is now const // nope- Parent is not const - it points to a const A - not the same thing !!! // try const A * const Parent = Child; // const pointer to a const A // also the following will work - I believe A * const Parent = Child; > > // create and open a character archive for output > std::ofstream ofs( "filename" ); > > // save data to archive > { > try > { > boost::archive::text_oarchive oa( ofs ); > // write class instance to archive > oa << Parent; // Ptr dereferencing is performed by the > library } > catch( boost::archive::archive_exception& e ) > { > std::cout << "Save failed! : " << e.what(); > std::cout.flush(); > > return false; > } > catch( ... ) > { > std::cerr << "Unknown Exception " << std::endl; > > return false; > } > > // archive and stream closed when destructors are called > } > > delete Child; > } > > -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Robert > Ramey > Sent: Saturday, July 22, 2006 6:43 PM > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] [Serialization] Problem > serializingviabaseclassptr > > Three show stopping problems in this code: > > a) A doesn't have serialize method even though > such a method is invoked by base object. see: > http://www.boost.org/libs/serialization/doc/serialization.html > > b) saving a non-const object - see rationale section > > c) Main show stopper: > >> int main() >> { >> // Create a B object >> B* Child = new B; >> >> // Set some data >> std::string Data = "test"; >> Child->SetValue( Data ); >> >> // Assign it to a A ptr >> // const A* Parent = Child; // ****** note new const - see >> rationale >> >> // create and open a character archive for output >> std::ofstream ofs( "filename" ); >> >> // save data to archive >> { >> try >> { >> boost::archive::text_oarchive oa( ofs ); >> // write class instance to archive > // *** big problem here. Dereferecing pointer to A > yields a > ref > // *** to an A - regardless that ptr was a B. What you > really want is: > oa << Parent; // *** let serialization handle > dererencing // *** instead of: >> //oa << *Parent; >> } >> catch( boost::archive::archive_exception& e ) >> { >> std::cout << "Save failed! : " << e.what(); >> std::cout.flush(); >> >> return false; >> } >> catch( ... ) >> { >> std::cerr << "Unknown Exception " << std::endl; >> >> return false; >> } >> >> // archive and stream closed when destructors are called >> } >> >> delete Child; >> } >> > > > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users

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Re: [Boost-users] Ownership of Boost IP?
by Sohail Somani 08 Aug '06

08 Aug '06

> -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Nat > Goodspeed > Sent: Tuesday, August 08, 2006 7:36 AM > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] Ownership of Boost IP? > > Well, I've talked this over with my boss, and he's at least willing to > go to bat for this. Many thanks for all your helpful suggestions! Looks like you got a good one then :)

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Re: [Boost-users] Ownership of Boost IP?
by Nat Goodspeed 08 Aug '06

08 Aug '06

Well, I've talked this over with my boss, and he's at least willing to go to bat for this. Many thanks for all your helpful suggestions!

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[Boost][multi_index] proper way to make a complex query
by Sebastien Fortier 08 Aug '06

08 Aug '06

I will try to make this as simple as possible, I have the following struct struct meteo_record { public: [...ctor...] [...getters and setters...] private: string var_name; string grid_type; float ip1; float ip2; float ip3; float ig1; float ig2; float ig3; int ip1Kind; int data_key; }; All these attributes are non-unique except for the data_key which is not a sorting criteria. What I need to do is to be able to iterate over the whole set by certain criteria. lets say I have the following records [var_name grid_type ip1 ip2 ip3 ig1 ig2 ig3 ip1kind] >> 12345 12 34 5 0 0 0 1 ^^ 12345 12 34 5 0 0 0 1 GZ 12345 645 24 1 12 34 5 1 GZ 12345 646 24 1 12 34 5 1 GZ 12345 647 24 1 12 34 5 1 GZ 12345 645 24 1 12 34 5 2 GZ 12345 646 24 1 12 34 5 2 GZ 12345 647 24 1 12 34 5 2 GZ 12345 645 26 1 12 34 5 1 GZ 12345 646 26 1 12 34 5 1 GZ 12345 647 26 1 12 34 5 1 GZ 12345 645 26 1 12 34 5 2 GZ 12345 646 26 1 12 34 5 2 GZ 12345 647 26 1 12 34 5 2 TT 12345 645 24 1 12 34 5 1 TT 12345 646 24 1 12 34 5 1 TT 12345 647 24 1 12 34 5 1 TT 12345 645 24 1 12 34 5 2 TT 12345 646 24 1 12 34 5 2 TT 12345 647 24 1 12 34 5 2 TT 12345 645 26 1 12 34 5 1 TT 12345 646 26 1 12 34 5 1 TT 12345 647 26 1 12 34 5 1 TT 12345 645 26 1 12 34 5 2 TT 12345 646 26 1 12 34 5 2 TT 12345 647 26 1 12 34 5 2 [...same sequence again with different grid_type...] >> 33345 33 34 5 0 0 0 1 ^^ 33345 33 34 5 0 0 0 1 TT 33345 647 26 1 33 34 5 2 [...] the grid_type is derived from ip1 ip2 and ip3 in some cases and from ig1 ig2 and ig3 in some other cases my criterias are *sort by same _gryd_type_ group by _var_name_ with same _ip2_ and same _ip1kind_ ordered on _ip1_* What I have done is create a multi_index with the grid_type as an index and then I created views for all the other attributes. I first iterate over the grid_types and keep the unique ones in an array (only the keys) /// probably the wrong way to do this in this case I would keep 12345 and 33345 /// for (recordIter = set.begin(); recordIter != set.end(); recordIter = set.upper_bound( (*recordIter)->getgrid_type() ) ) /// /// returns only one of each duplicate grid_type /// for each grid_type I then create the var_name view and iterate over the unique var_names and so on and so on... until i get a grouping that looks like this [var_name grid_type ip1 ip2 ip3 ig1 ig2 ig3 ip1kind] GZ 12345 645 24 1 12 34 5 1 GZ 12345 646 24 1 12 34 5 1 GZ 12345 647 24 1 12 34 5 1 Once I get a grouping like this one, I extract the data_key for each record and read the data from a file. Then I construct a matrix for this grouping from the corresponding data that was read. There must be a better way of doing this, any help will be greatly appreciated! -- Sébastien Fortier

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