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Interval cos fails on 64 bits platforms
by Christophe TROESTLER 05 Jun '10

05 Jun '10

Hi, I would like to use boost interval library in computer assisted proofs. However my machines are mostly 64 bits and the attached program fails -- returning [nan, nan] -- on them. On 32 bits, it works fine. Since this bug seems to be known [1], may somebody tell me how much progress has been done on solving it and whether there is there a workaround available? Thanks. Best, Christophe [1] https://svn.boost.org/trac/boost/ticket/2769 https://svn.boost.org/trac/boost/ticket/4011 #include <boost/numeric/interval.hpp> #include <fstream> #include <iostream> using namespace boost; using namespace numeric; using namespace interval_lib; typedef interval<double, policies<save_state<rounded_transc_opp<double> >, checking_base<double> > > I; template<class T, class Policies> std::ostream &operator<<(std::ostream &os, const boost::numeric::interval<T, Policies> &x) { os << "[" << x.lower() << ", " << x.upper() << "]"; return os; } int main() { std::cout << cos(I(-1, -0.6)) << "\n"; }

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guessing Y-values
by Andrej van der Zee 05 Jun '10

05 Jun '10

Hi, In my program I have many points in a two-dimensional space, let's say on the X-axis I have time and on the Y-axis I have values ranging from -100 to +100. But unfortunately not for every value on the X-axis I have a Y-value. Though, I have to be able to "guess" the Y-values for every X-value. The (x,y)-points do correlate but I do not now how; sometimes it is a straight line, other times it is parabolic. My question is if boost has any support for this kind of problem. Thank you, Andrej

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[Test] Tests execution order and depends_on method.
by Maria Kozinska 05 Jun '10

05 Jun '10

Hello, I have couple of question to Boost.Test framework. I'd like to ask why test_unit::depends_on(test_unit*) method is not described in User's guide. Is it only for internal use by framework or I can use it freely? I assume, that it can be used to determine precedence of one test before another. What happens if there is a cycle in dependence graph? If a test case fails, are dependant on it tests executed? In what order are executed automatically registered test suites and test cases? And in what order when they are manually registered (without any depends_on)? How this order is affected by depends_on method? Thanks for answer. Greetings, Maria

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Boost MPI Serialization : Sending serialized array of user defined classes
by Noman Javed 04 Jun '10

04 Jun '10

I want to send my Array class using boost Mpi template<class T> class Array { private: int size; T* data; public: // constructors + other stuff }; Here T can be any built in type or user defined type. Suppose I have a class complex struct complex { std::vector<double> real_imag; // contain two elements }; How can I send Array<complex> using Boost::Mpi + serialization. Thanks in anticipation Regards Noman

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[GIL] How to create (and read) a 4 pixels per sample image type?
by Olivier Tournaire 04 Jun '10

04 Jun '10

Hi all, I am currently trying to create and read an image which has 4 pixels per sample. Here is the output of tiffinfo on such an image : TIFF Directory at offset 0x8 (8) Image Width: 2273 Image Length: 2256 Resolution: 72, 72 pixels/inch Bits/Sample: 16 Sample Format: unsigned integer Compression Scheme: None Photometric Interpretation: RGB color Extra Samples: 1<unspecified> Samples/Pixel: 4 Rows/Strip: 2256 Planar Configuration: single image plane How can I achieve this gola with GIL? Best regards, Olivier

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splitting non intrusive serialization into save/load
by Babineau, Denis 04 Jun '10

04 Jun '10

Hi I'm trying to serialize a class using non intrusive templates since I can't modify the class. The class has proper set/gets but doesn't expose the data directly so I would need to use the save/load method which requires a macro to be defined in the class but, again, I can't modify the class. Looking at the code, I tried the following to have the save/load implemented outside but get the following error with MSVC 7.1 (boost version 1.39). Is there any way to accomplish what I'm trying to do here? Thanks Denis error C2270: 'save' : modifiers not allowed on nonmember functions sample implementation: class MyClass { public : int GetValue() const; public : void SetValue(int v); private: int m_Value; }; ... namespace boost { namespace serialization { template <class Archive> void save(Archive & ar, MyClass & c, const unsigned int version) const { int v = c.GetValue(); ar & v; } template <class Archive> void load(Archive & ar, MyClass & c, const unsigned int version) { int v; ar & v; c.SetValue(v); } template <class Archive> void serialize(Archive & ar, MyClass & c, const unsigned int version) { boost::serialization::split_member(ar, c, version); } }} CONFIDENTIALITY NOTICE: The contents of this email are confidential and for the exclusive use of the intended recipient. If you receive this email in error, please delete it from your system immediately and notify us either by email, telephone or fax. You should not copy, forward, or otherwise disclose the content of the email.

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filesystem and range::copy
by Olaf Peter 04 Jun '10

04 Jun '10

Hi, does the boost filesystem support boost.range (or vice versa?) I've got a compile error by fs::ifstream in( ... ); std::string storage; boost::copy( in, std::back_inserter( storage ) ); using trunk boost/mpl/eval_if.hpp: In instantiation of ‘boost::mpl::eval_if_c<true, boost::range_const_iterator<boost::filesystem::basic_ifstream<char, std::char_traits<char> > >, boost::range_mutable_iterator<const boost::filesystem::basic_ifstream<char, std::char_traits<char> > > >’: boost/range/iterator.hpp:63: instantiated from ‘boost::range_iterator<const boost::filesystem::basic_ifstream<char, std::char_traits<char> > >’ boost/range/concepts.hpp:221: instantiated from ‘boost::SinglePassRangeConcept<boost::filesystem::basic_ifstream<char, std::char_traits<char> > >’ boost/concept/detail/has_constraints.hpp:42: instantiated from ‘const bool boost::concepts::not_satisfied<boost::SinglePassRangeConcept<boost::filesystem::basic_ifstream<char, std::char_traits<char> > > >::value’ boost/concept/detail/has_constraints.hpp:45: instantiated from ‘boost::concepts::not_satisfied<boost::SinglePassRangeConcept<boost::filesystem::basic_ifstream<char, std::char_traits<char> > > >’ Thanks, Olaf

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[BGL] Usage of stateful allocator
by Geoff Hilton 04 Jun '10

04 Jun '10

Is a static instance of a stateful allocator the only way to make the BGL graph interface accept it with boost::container_gen, or is the use of a stateful allocator with the BGL possible? The reason this is necessary is that I'd like to wrap an array class (which isn't STL compatible) provided by a third party for use with the BGL so that I can navigate the array of vertices and edges as modeled by the graph it contains. This array class however is useless unless it receives a reference to an instance of the stateful allocator upon its' construction. Currently I have to hold a BGL graph in memory which contains vertex and edge array indices reflecting matching positions in instances of the third party array class (one for the vertices, one for all the edges). (Unrelatedly but possibly useful to know) Once this graph is complete, I need access to the arrays themselves to pass them on to other objects that are part of the third party library. Thanks, Geoff

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[shared_ptr] boost::make_shared & std::tr1::shared_ptr
by Geoff Hilton 04 Jun '10

04 Jun '10

It's not currently possible to mix boost::make_shared with the shared_ptr implementation provided by <boost/tr1/memory.hpp>. Could this be made possible or would mixing the two be a design flaw on my part? Thanks, Geoff

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[Interprocess] Determine if named_mutex was opened or created
by Sönke Schau 03 Jun '10

03 Jun '10

Hello! In the constructor of named_mutex it is possible to specify that the mutex should be opened or otherwise created. Is there a way to determine which took place: creation or open? Best regards Sönke

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