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function template overload resolutions
by Hicham Mouline 15 Mar '08

15 Mar '08

Hello As functions templates cannot be partially specialized, Sutter(05) advices that one can use overload resolution instead: I have // header N.h namespace A { namespace B { namespace C { template<typename cT, typename tT, int n> void make(const cT&, const tT&, const Head<n>& h) {...} } } } // header 3.h namespace A { namespace B { namespace C { template<typename cT, typename tT> void make(const cT&, const tT&, const Head<3>& h) {...} } } } // header 2.h namespace A { namespace B { namespace C { template<typename cT, typename tT> void make(const cT&, const tT&, const Head<2>& h) {...} } } } // Translation unit #include N.h #include 3.h #include 2.h //in this order A::B::C::make(...) The overload resolution is done on the Head<n>&, Head<2>&, Head<3>... Is it sensitive to order of inclusion? rds,

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dll or not dll or what?
by Martina Janter 15 Mar '08

15 Mar '08

Hello! being a beginner in C++ and boost I set up the stuff for use with VC++ 2005 Express just today. After some problems I finally managed to get it link, but it's still not fully the way I want. There are three libs: boost...dll, libboost...lib and libboost...s...lib. My questions: -What's the difference between the second and the third one? -Why does building with the IDE link against the second and building on the console (/ link /LIBPATH:...) link against the third type? I looked into auto_link.hpp and the IDE seems to set _DLL but boost doesn't define BOOST_DYN_LINK. But I can't find out why. This leads to question 3: -How to link so the dll will be used? That questions might be a good deal compiler specific but since auto_link.hpp is involved I hope here's still the right place to ask. Thank you in advance! AJ Martin

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[multi_array] Assertion failure in multi_array<...>::resize
by Rainer Deyke 15 Mar '08

15 Mar '08

The following minimal test program produces an assertion failure. Is this a bug in boost::multi_array or a bug in the test program? #include "boost/multi_array.hpp" int main() { boost::multi_array<bool, 1> a; a.resize(boost::extents [boost::multi_array_types::extent_range(1, 2)]); return 0; } -- Rainer Deyke - rainerd(a)eldwood.com

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[interprocess] Where to get it?
by Boris 14 Mar '08

14 Mar '08

Is the CVS the only place to get the source code of Boost.Interprocess? I thought I would find a zip archive at http://www.boost-consulting.com/vault/ at least so I don't need to pick files one by one from the CVS. Any other place where I can download the current version of Boost.Interprocess quickly? I know the documentation at http://igaztanaga.drivehq.com/interprocess/ but there is no link either? :-/ Boris

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[Mutex] behaviour??
by Yasmina Berber 14 Mar '08

14 Mar '08

Hi, everybody I have a problem to understand mutex behaviour in a server client program . basically there are two threads that execute different code in two different classes but manipulate the same resource: fisrt Class is Subscriber with these members : public: ACE_Unbounded_Set<client_reference> m_set; typedef boost::recursive_mutex Mutex; typedef boost::recursive_mutex::scoped_lock Lock; Mutex mutex_set; and methods: Subscribe (client_reference) : inserts (add) a reference client to the set { ... Lock theScope( mutex_set); m_set.insert (client_reference) ... } Unsubscribe(client_reference) : removes a reference client from the set { ... Lock theScope( mutex_set); m_set.remove (client_reference) } the second class is Manager that has a shared pointer to Subscriber (SubscriberPtr) and does a specific opeartion on each client_reference inside a for loop in the method Manage() { boost::recursive_mutex::scoped_lock scoped_lock(subscriberPtr->mutex_set) for (Subscriber::Set_Iterator iter (subscriberPtr->m_set); iter.next (...) != 0 ; iter.advance ()) { specific opeartion on each client reference } } What happens is that a client can be removed (call to Unsubscribe()) by the first thread during the second one is executing manage() : the set is not well protected and this causes of course seg fault. I probably do something wrong, If you need more details please let me know. Regards.

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Boost.Regex and static ICU libraries
by a86yes 14 Mar '08

14 Mar '08

Hello, The ICU4C readme says that the define U_STATIC_IMPLEMENTATION should be defined in user code that links against ICU's static libraries. Grepping the entire Boost, I do not see it. Is linking against ICU static libraries supported at all and if yes, where is the best place to define this macro when building Boost.Regex? _________________________________________________________________ Сдобий се със следващата генерация Windows Live услуги сега! http://get.live.com

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a few boost interprocess question
by Abir Basak 14 Mar '08

14 Mar '08

Hi, i just started using boost interprocess for giving shared memory access to one of my program to the debugger. It is just superb! but as usual there are a few questions and clarifications, 1) can i find any document saying which of the stl containers are "shared memory safe" so that i dont need to use the special one provided ? esp which of the stl containers from msvc 7.1 (2003) are shmm safe . 2) how can i make my hand crafted container shmm compatible ? I take allocater as param, pointer & ref are typedef from allocater, all construct & destroy are done using allocator. thanks again for the wonderful library abir

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Undefined reference to 'main' with Boost Test. Why?
by Stephen Torri 14 Mar '08

14 Mar '08

Why in the heck did the boost unit test framework change to remove main? Why does the documentation not reflect this? Why are the example describing the old behavior? How am I now suppose to use the Boost unit test framework? The following program will NOT compile because of the change in 1.34.1 since the 1.33: /* test_grnn.cpp #include <boost/test/unit_test.hpp> using namespace boost::unit_test_framework; void test_distance_squared () { // do work } test_suite* init_unit_test_suite ( int, char** ) { test_suite* test = BOOST_TEST_SUITE ("GRNN test suite"); // Allow GRNN to allocate our memory at any location test->add ( BOOST_TEST_CASE ( &test_distance_squared ) ); return test; }

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[function] setting a function from within a call on the function?
by Cory Nelson 14 Mar '08

14 Mar '08

Hi guys, ran across a question that I'd have thought would be at least common enough to get a note in the docs, but I can't find it there. Is it safe to set a function from within a call on the function? boost::function<void()> f; void func2(); void func1() { f = func2; } void main() { f = func1; f(); } -- Cory

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[bind] VC++ 2008 compiler error
by Boris 14 Mar '08

14 Mar '08

Can anyone explain to me why VC++ 2008 refuses to compile this code: void empty() { } template <class T> void foo(T t) { // error C2664: 'void (T)' : cannot convert // parameter 1 from 'void' to 'boost::_bi::bind_t<R,F,L>' boost::bind(bar<T>, t)(); // This one works though: boost::bind(bar<T>, _1)(t); } template <class T> void bar(T t) { t(); } int main() { foo(boost::bind(empty)); } Is this a problem with the VC++ 2008 compiler or am I trying to do something which isn't supported by Boost.Bind? Boris

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