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

[boost-users] How to put together a tuple type?
by Christian Henning 25 Aug '06

25 Aug '06

Hi there, just trying to figure out how to put together a tuple type at compile type? Please consider the following code: struct s1 { static const int num_values = 1; int i; }; struct s2 { static const int num_values = 2; int i; int j; }; struct s3 { static const int num_values = 3; int i; int j; int k; }; template< class S > void create_tuple( S s ) { /// create tuple_type map< tuple_type, unsigned int > map; map[ make_tuple( s ) ] = 99; } The template parameter S will only be one of above defined structs. Clearly, I need to loop over S::num_values to create the tuple type. But how do I do that? Thanks ahead, Christian

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how to reverse a regex ?
by david v 25 Aug '06

25 Aug '06

Hello, Is it possible to reverse a regex. In my example below i'm trying to match the word "hope " and its reverse "epoh". Obviously i could build up a regex such as (hope|epoh) but i was wondering if there is a member in libboost that implements that function directly ? string re = "hope"; boost::regex *regex = new boost::regex(re,boost::regbase::icase); std::string in = "hope is forward and epoh is reversed"; boost::smatch match; std::string::const_iterator start = in.begin(); std::string::const_iterator end = in.end(); while (boost::regex_search(start,end,match,re,boost::match_extra)) { cout << "Match:" << match[0] ; } Thanks, david

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Re: [Boost-users] boost.test and Cruise Control
by Ferentinos, Jerry 25 Aug '06

25 Aug '06

-----Original Message----- From: Matt Schuckmann Sent: Thursday, August 24, 2006 11:43 AM Has anybody out there integrated tests built on boost.test with Cruise Control or Cruise Control .NET. ...snip... Hi Matt, We currently use CruiseControl.NET and boost::test for continuous integration and testing of our deliveries. What we'll typically do is create a testing project (.exe) for each module (.dll) in our system and invoke it from an NAnt script that we call from a CruiseControl task. As new testing projects are created we add them to the NAnt unit-testing target. NAnt can report non-zero return values from executables as being failures and CruiseControl can be configured to regard these as either build or test failures depending on how it's configured. Jerry Ferentinos Basic Research Informatics Merck Frosst Center for Therapeutic Research www.merckfrosstlab.ca We've started creating Unit Tests and we are just starting to use Cruise Control for continuous build integration and I'd like to have Cruise Control run and report on the unit tests. A quick look around Cruise Control only shows integration with NUnit. I don't know how tough or easy it is to make something workable with Boost.Test Sorry if this has already been addressed I did try to search for it but came with nothing in my new reader and the web interface is down. Thanks Matt S. _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users ------------------------------------------------------------------------------ Notice: This e-mail message, together with any attachments, contains information of Merck & Co., Inc. (One Merck Drive, Whitehouse Station, New Jersey, USA 08889), and/or its affiliates (which may be known outside the United States as Merck Frosst, Merck Sharp & Dohme or MSD and in Japan, as Banyu - direct contact information for affiliates is available at http://www.merck.com/contact/contacts.html) that may be confidential, proprietary copyrighted and/or legally privileged. It is intended solely for the use of the individual or entity named on this message. If you are not the intended recipient, and have received this message in error, please notify us immediately by reply e-mail and then delete it from your system. ------------------------------------------------------------------------------

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serialization library has misspelled constant
by Dan Bikel 25 Aug '06

25 Aug '06

The struct boost::serialization::tracking_level has a misspelled constant. Instead of it having a constant named "track_selectively", the constant is misspelled "track_selectivly". For backward compatibility, I would add a new constant with the correct spelling that has the value of the old, misspelled constant. (This bug exists in v. 1.33.1 of boost.) --Dan.

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errors serializing pointers on Fedora Core 5
by Dan Bikel 25 Aug '06

25 Aug '06

The following tiny program generates two compiler errors on FC 5 (which comes with g++ 4.1.1 and boost 1.33.1): #include <iostream> #include <fstream> #include <string> #include <boost/archive/text_oarchive.hpp> #include <boost/archive/text_iarchive.hpp> #include <boost/serialization/string.hpp> using namespace std; using namespace boost; int main(int argc, char **argv) { string * pFoo = new string("foo"); ofstream ofs("strfile"); { archive::text_oarchive oa(ofs); oa << pFoo; } } Error No. 1: /usr/include/boost/archive/detail/oserializer.hpp:567: error: invalid application of -1òøsizeofòù to incomplete type òøboost::STATIC_ASSERTION_FAILURE<false> Error No. 2: /usr/include/boost/serialization/access.hpp:109: error: -1òøstruct std::basic_string<char, std::char_traits<char>, std::allocator<char> >òù has no member named òøserializeòù Error No. 1 can be fixed by making pFoo a const pointer type, i.e., by changing the declaration/assignment statement to be string *const pFoo = new string("foo"); I cannot figure out why such a change is necessary, as the serialization library documentation does not indicate that it is necessary to make pointers const in order to serialize them (as is borne out by the demo.cpp code). Also, I cannot figure out how to fix Error No. 2. Any help would be much appreciated! Thanks, Dan.

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[MPL/Fusion?]Call a 0-args template function on members of a sequence
by Edd Dawson 24 Aug '06

24 Aug '06

Hello all, I have the following: template<typename T> void f() { /* ... */ } typedef boost::mpl::vector<int, long, double> my_vec; I'm looking for a way to call f<T>() for all types T in my_vec. I initially hoped that either an mpl algorithm or fusion::for_each might be able to accomplish this for me, but after reading through their docs this doesn't appear to be the case. Am I correct in this conclusion? If not, I'd really appreciate someone giving me a quick pointer as to what I need to do. Currently I'm using the specialization/static-recursion trick. Something like: template<typename types, int idx, int size> struct helper { static void call_f() { using namespace boost::mpl; f< at<types, int_<idx>::type >::type >(); helper<types, idx + 1, size>::call_f(); // recurse } }; template<typename types, int size> struct helper<types, size, size> { static void call_f() { } // end recursion }; void call_f_with_each_type() { enum { num_types = size<my_vec>::type::value }; helper<my_vec, 0, num_types>::call_f(); } It works fine, but I'm wondering if there's a more succinct and readable way. Kind regards, Edd

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No thread safe libraries built for Darwin when using release 1.33.1?
by Rush Manbert 24 Aug '06

24 Aug '06

Hi All, This has been discussed before, but I can't find an answer, so here is another bjam build question. When I build the Boost libraries using the VC8 toolset on the PC, I create thread safe (-mt) versions of the libraries. When I build the Boost libraries on Darwin, there are never any thread safe library versions built, even if I specify "-sBUILD=<threading>multi" on the bjam command line. I have found threads that discuss use of the thread safe version of the regex lib, so I know that it exists and gets built on some platform(s). Why are there no thread safe libraries built for the Darwin toolset? On the surface, this seems like a bug, but I figure there must be some reasonable explanation. (Oh, please, let there be a reasonable explanation! :-) Regards, Rush

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boost.test and Cruise Control
by Matt Schuckmann 24 Aug '06

24 Aug '06

Has anybody out there integrated tests built on boost.test with Cruise Control or Cruise Control .NET. We've started creating Unit Tests and we are just starting to use Cruise Control for continuous build integration and I'd like to have Cruise Control run and report on the unit tests. A quick look around Cruise Control only shows integration with NUnit. I don't know how tough or easy it is to make something workable with Boost.Test Sorry if this has already been addressed I did try to search for it but came with nothing in my new reader and the web interface is down. Thanks Matt S.

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shared_ptr implementation question
by Ovanes Markarian 24 Aug '06

24 Aug '06

I have a question regarding shared_ptr implementation: currently shared_ptr is implementated so, that it contains: T * px; // contained pointer detail::shared_count pn; // reference counter I am interested to know philosophical thoughts why this kind of decision was made to implement the shared_ptr class this way? I assumed to save space which is consumed by such a pointer one could move T pointer (T*) to shared_count class. All shared_ptr classes would contain only one instance or (may be better pointer to counter): detail::shared_count* pn; // reference counter and the approach to retrieve pointer would be: pn->px //since px would be moved to pn This would reduce the size of shared_ptr<T> to sizeof(detail::shared_count*) which is at least by sizeof(detail::shared_count) smaller of may be more if alignment has to used. Are there any arguments which prevent shared_ptr from such implementation scenario? With Kind Regards, Ovanes Markarian

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[Boost-Threads] Assertion during a second call to thread::join()
by Aubrey, Jason 24 Aug '06

24 Aug '06

Hi, Does anyone know the reason for the behavior in the following example program? This example attempts to simulate the scenario where two threads wait on a third thread. However, I realize that the following is actually one thread waiting on a second thread twice. Regards, Jason My Environment: MSVC 8.0, boost v1.33.1 #include <boost/thread/thread.hpp> #include <boost/thread/xtime.hpp> void f() { } void main() { boost::thread t(f); t.join(); t.join(); // Causes an assertion }

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