- Boost-users - lists.boost.org

RE: [Boost-users] Problem with boost random library.
by Tom Matelich 07 Jul '04

07 Jul '04

This is totally a shot in the dark, but the last time I had this problem, my static class members inside a gcc library were not getting constructed because I wasn't using gcc as my linker. Perhaps those two have static non-POD members and the others don't. > -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of > Joshua Little > Sent: Saturday, July 03, 2004 8:09 PM > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] Problem with boost random library. > > > Just to make sure I answer my own mails as much as possible. > I tried a > few different random generators. Rand48, mt11213b, and > minstd_rand and > they all worked inside of my game. So it seems like mt19937 and the > lagged_fibonacci's are causing the problem. So obviously I > can use one > of the other generatrors but its still bothers me that the > mt19937 and > lagged_fibonaccis generators segfaults for reasons that are > not apparent > to me. Maybe this information will help give ideas to anyone > who might > know what might be wrong, maybe there is a difference between the > generator types that might be causing the problem? > Thanks, > Joshua. > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/bo> ost-users > ----------------------------------------------------------------------- DISCLAIMER: Information contained in this message and/or attachment(s) may contain confidential information of Zetec, Inc. If you have received this transmission in error, please notify the sender by return email. -----------------------------------------------------------------------

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thread and Mac OS X
by Tristan King 07 Jul '04

07 Jul '04

i've written a little test to see if i've installed boost properly on my mac #include <boost/thread.hpp> #include <boost/shared_ptr.hpp> #include <boost/bind.hpp> #include <iostream> void simple_thread( boost::shared_ptr<int> p ) { std::cout << (*p) << std::endl; } int main (int argc, char * const argv[]) { boost::thread_group threads; for ( int i = 0 ; i < 5 ; i++ ) { boost::shared_ptr<int> p( new int(i) ); threads.create_thread( boost::bind( &simple_thread, p ) ); } threads.join_all( ); return 0; } in xcode (a C++ Tool project) this compiles fine, however on runtime i get the following error: ZeroLink: unknown symbol '__ZN5boost12thread_groupC1Ev' boost_test has exited due to signal 6 (SIGABRT). using g++ i get the following errors (ignoring warnings) g++ main.cpp -o boost_test -I/usr/local/include/boost-1_31 -L/usr/local/lib ld: Undefined symbols: boost::thread_group::create_thread(boost::function0<void, std::allocator<boost::function_base> > const&) boost::thread_group::join_all() boost::thread_group::thread_group[in-charge]() boost::thread_group::~thread_group [in-charge]() i originally built boost using the command line sudo bjam -sTOOLS=darwin install can anyone help me with what i am missing here? thanks --Tristan

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RE: [Boost-users] [pool] Speed of pool_allocator<>
by Klaus Nowikow 06 Jul '04

06 Jul '04

Peter Dimov wrote: > Klaus Nowikow wrote: > > template <class Allocator> > > double Test() > > { > > std::vector<Allocator::value_type, Allocator> Vector; > > boost::timer Timer; > > > > for(int i = 0; i < NUM_ELEMENTS; ++i) > > { > > Vector.push_back(i); > > } > > > > return Timer.elapsed(); > > } > > If I read the code correctly, you don't create or delete > objects. You create > and delete (large) arrays of objects. I changed the test program (see below). Now I use object_pool<> to create and destroy a number of elements (I use a vector<C*> to store them in the meantime). The results are even worse than before: new/delete: 0.08s object_pool: 25.20s Note that I created a class non_pool with an interface similar to object_pool to be able to use one function template for both tests. // MemoryPoolTest.cpp #include <boost/timer.hpp> #include <boost/pool/object_pool.hpp> #include <vector> #include <iostream> enum { NUM_ELEMENTS = 100000 , CHUNK_SIZE = NUM_ELEMENTS }; class C { int i_; char c_; }; struct Empty { }; template <class T, class U = Empty> struct non_pool // create, destroy with new and delete { explicit non_pool(int) { } T* construct() const { return new T; } void destroy(T* pT) { delete pT; } }; template <template <class, class> class Pool> double Test() { Pool<C> P(CHUNK_SIZE); boost::timer Timer; std::vector<C*> V; for(int i = 0; i < NUM_ELEMENTS; ++i) { V.push_back(P.construct()); } for(std::vector<C*>::iterator pos = V.begin(), end = V.end(); pos != end; ++pos) { P.destroy(*pos); } return Timer.elapsed(); } int main(int, char**) { std::cout << "Starting memory pool test" << std::endl; double Time; std::cout << "Allocating with new : "; Time = Test<non_pool>(); std::cout << Time << "s" << std::endl; std::cout << "Allocating with boost::object_pool<>: "; Time = Test<boost::object_pool>(); std::cout << Time << "s" << std::endl; return 0; }

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errors building boost on Mac OS X
by Tristan King 06 Jul '04

06 Jul '04

Hi, i get a few errors when building the following libraries on Mac OS X 10.3.4 libboost_test_exec_monitor libboost_unit_test_framework i'm building using bjam, and the following command line bjam -sTOOLS-darwin install sniplets of the errors are as follows: darwin-Link-DyLib-action bin/boost/libs/test/build/libboost_prg_exec_monitor.dylib/darwin/debug/shared-linkable-true/libboost_prg_exec_monitor-d-1_31.dylib ld: Undefined symbols: cpp_main(int, char**) .... darwin-Link-DyLib-action bin/boost/libs/test/build/libboost_test_exec_monitor.dylib/darwin/debug/shared-linkable-true/libboost_test_exec_monitor-d-1_31.dylib ld: Undefined symbols: test_main(int, char**) .... darwin-Link-DyLib-action bin/boost/libs/test/build/libboost_unit_test_framework.dylib/darwin/debug/shared-linkable-true/libboost_unit_test_framework-d-1_31.dylib ld: Undefined symbols: init_unit_test_suite(int, char**) am i missing something here? thanks --Tristan

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Problem using exported C++ functions to python
by mayankg＠iiitb.ac.in 06 Jul '04

06 Jul '04

Hi, I have the following type of functions in a class say "MyClass", which I have exported to python. 1) func1(long *plong) 2) func2(TempClass **pptempclass) (where TempClass is some other class) Now, I exported these using the following: .def("func1", &MyClass::func1) .def("func2", &MyClass::func2) and it compiled well. But now when I try to use them in a python script, I have no clue as to how I create and pass: 1) a long pointer as argument to func1 2) a double pointer to TempClass as argument to func2 How do I achieve this behaviour? 1) Do I have to wrap the above functions> If yes, then how? How will they be used in python then? OR 2) I can still use the same functions in python but then how to create (instantiate and initialize) the above pointers in python? Thanks, Mayank

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RE: [Boost-users] Re: detect unneded includes
by Ben Hutchings 05 Jul '04

05 Jul '04

Adrian Stoica <adrian_stoica(a)btinternet.com> wrote: > I'm not aware of any such tools, but it could be done with a Perl > script that removes the includes one at a time, and then invokes the > compiler. If the file compiles ok, it's probably safe to remove that > include. No, unfortunately not. A header might appear to be redundant because it is included by another, yet this may be a mere implementation detail which is subject to change and should not be relied upon. In the absence of a true module system this is impossible to determine. Also it could be that the header defines template specialisations, or macros with the same names as functions/objects. Removing such a header might not make the program ill-formed but could still break it subtly. Instantiating a template in one translation unit for the same template arguments for which there is an explicit specialisation in another translation unit results in undefined behaviour. With sufficient testing you can *probably* avoid such mishaps but I would be very wary of trying to automate this.

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newbie: need example (call python from c++)
by Peter Piehler 04 Jul '04

04 Jul '04

Hello, I use call<void>(pyFunc,arg1,..) to call a python function with standard double, int etc. What must I do to call a function with a c++ object as argument? psydocode: class MyAnimal { /*...*/ std::string __strName; public: MyAnimal() : __strName("Tux") {} /*...*/ std::string getName() { return __strName;} void setName(const std::string &strName) { __strName = strName; } }; int main() { /*...*/ MyAnimal* pTux = new Animal; /*do something with pTux*/ /*use a python function with pTux*/ call<void>(pyFunc1, ?pTux? ); /*change attributes pTux in pyFunc2*/ dog = call<MyAnimal>(pyFunc2, ?pTux?); /*if it possible to call by reference?*/ call<void>(pyFunc3, ?pTux?); pTux->getName();// return Cat } python module: def py_func1(a): print a.getName() def py_func2(a): a.setName('Dog') return a def py_funnc3(a): a.setName('Cat') ___________________________________________________________ Gesendet von Yahoo! Mail - Jetzt mit 100MB Speicher kostenlos - Hier anmelden: http://mail.yahoo.de

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Problem with boost random library.
by Joshua Little 04 Jul '04

04 Jul '04

Hi all, I'm trying to use the randome number generators but I am having some problems. I'm using boost 1.31.0 and gcc 3.2 on Windows 2000. Here is my code : printf(" Die \n "); //std::cout << "Die Rolls" << std::endl; try { boost::mt19937 rng; // produces randomness out of thin air // see pseudo-random number generators boost::uniform_int<> six(1,6); // distribution that maps to 1..6 // see random number distributions boost::variate_generator<boost::mt19937, boost::uniform_int<> > die(rng, six); // glues randomness with mapping int x = die(); printf(" Die %d\n ",x); } catch(...) { std::cout << "exception" << std::endl; printf(" Die exception \n "); } I basically copied the example code off the web site to see if I could get it to work but I'm not having any luck. If I have the variate_generator defined as above I do not not get any output to the console after the declaration of die. I tried printf's and stream output but neither works, I never see the "Die %d" printed out and I do not see either of the outputs in the catch(...) section. printed either. I even had a throw in the try block at one time to see if it could get to the catch section and did not see output. When I remove the die declaration (and comment out the code that uses it) but leave the generator and the distribution then I can see output again and if I throw after the distribution declaration then I see both output statements in the catch block. So it seems like if I have the variate generator declared then I can't see any output after that, but when I comment it out I can see output again. I'm not sure what I'm doing wrong since I am basically copying a pretty simple example from the book I just can't get it to work. Ah and just incase this makes a difference I'm running this code as a test case in a boost test suite. I wanted to try to get it to work there before putting it into my main app. Thanks, Joshua.

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building boost program options
by Christopher Baus 03 Jul '04

03 Jul '04

I'm trying to build the boost sandbox project program_options and am failing. Anyone know what version of boost is compiles cleanly with? -- Christopher Baus http://www.baus.net/

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RE: [Boost-users] Re: boost test doesn't track validation outside autofunctions
by Rozental, Gennadiy 02 Jul '04

02 Jul '04

> > > void validate(X args) { > > > if (some tests) > > > BOOST_ERROR("message"); > > > } > > > BOOST_AUTO_UNIT_TEST(testfunction) { > > > // set up arguments > > > validate(args) > > > } [...] > I think the problem is a think-o on my part. > In the pseudo-code above, BOOST_ERROR is not executed unless > "some tests" is true. So if the tests are OK, BOOST_ERROR is > never hit. > > I think the report of 0 (boost) tests being run is therefore > accurate, though confusing. It should actually say that 1 test cases being run, but no assertions executed. > Does that sound right? > > Is there a way to signal to boost that you are doing a test, > without the error? You have 2 choices. 1. Rewrite your test, so that it looks like: ... BOOST_CHECK_MESSAGE( some_test, "message" ); 2. Or you could write it like this: .... If(some_test) BOOST_ERROR("message") else BOOST_MESSAGE( "no error" ); I prefer first solution usually. HTH, Gennadiy

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