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multi_array resize question
by Wilfried Holzke 14 Jan '09

14 Jan '09

Hi, The documentation from multi_array says that if elements are added while reszize is called, the new elements are initialized with the default constructor. I have the following: typedef boost::multi_array<Object*, 2> Array_Type; What is the default constructor of a pointer? Or do need to do the following: class ptr { public: ptr() { p = 0; } Object *p; } typedef boost::multi_array<ptr, 2> Array_Type; ... to get all new elements to bee zero-pointers? Thanks for help. regards W. Holzke

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[serializaton] namespace issues with extended type info
by Daniel Roberts 14 Jan '09

14 Jan '09

If I nest macro calls such as: namespace SomeNamespace { BOOST_SERIALIZATION_ASSUME_ABSTRACT(SomeClass) BOOST_CLASS_TYPE_INFO(SomeClass, extended_type_info_no_rtti<SomeClass>) BOOST_CLASS_EXPORT(SomeClass) } inside the namespace containing the type I get a TON of compiler errors. The wackiest is that the compiler thinks boost is a namespace inside of my namespace. Things improve (not fully tested) if I move the macros outside of my namespace and qualify the type with namespace name: BOOST_SERIALIZATION_ASSUME_ABSTRACT(SomeNamespace::SomeClass) BOOST_CLASS_TYPE_INFO(SomeNamespace::SomeClass, extended_type_info_no_rtti<SomeNamespace::SomeClass>) BOOST_CLASS_EXPORT(SomeNamespace::SomeClass) Can someone explain please? Thanks

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Joining two forward ranges
by er 13 Jan '09

13 Jan '09

Hello, I'm looking to create an iterator which iterates over two joined ranges: [b0,e0)[b1,e1) I'm sure there's a way to do it with an iterator adapter. I was wondering, however, if someone knew of an already available implementation. Thank you.

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boost[thread] in win32 we have API like WaitForMultipleObjects.How can we implement the same using boost thread
by Mrudul Mahurkar 13 Jan '09

13 Jan '09

Hi, i am working on boost::asio and boost thread library.I am creating client application that will work against any server.In that application am using threads and for their synchronisation i need the APIs like WaitForSingleObject and WaitForMultipleObject given by win32.so is there any API in boost ::thread library so that it can work like that. Mrudul Mahurkar Mumbai.India. Add more friends to your messenger and enjoy! Go to http://messenger.yahoo.com/invite/

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[lambda] Does Boost.Lambda support local variables?
by Robert Jones 13 Jan '09

13 Jan '09

If so, can anyone point me at the relevant bit of documentation. If not, are there some 'standard' techniques to produce a similar effect? Many Thanks, Rob.

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class composition
by Hicham Mouline 13 Jan '09

13 Jan '09

hello, There is an example listed in "C++ template metaprogramming" to generate a class with its members from an mpl sequence: template <typename T> struct wrap { typedef T value; }; typedef mpl::vector< type1, type2, type3 > member_types; mpl::inherit_linearly< member_types, mpl::inherit< wrap<_2>, _1 > >::type generated; but then, the generated class did not look like this: class C { type1 t1; type2 t2; type3 t3; }; Can one do that with BOOST_PP and sequences from preprocessor libs instead? regards,

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Can BOOST 1.37 be built without using stlport in Solaris 5.9 Sunstudio 11
by Saibal 13 Jan '09

13 Jan '09

Hi, I am trying to build BOOST without using stlport library, I am getting some errors? Is it possible to build? Have anybody try that earlier? regards, Saibal

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stream error thrown in boost serialization
by Lee MacDonald 13 Jan '09

13 Jan '09

Guys, I'm having a bit of trouble with boost serialisation using boost 1.35 I am writing out my objects to a text file fine. I see the text_oarchive destructor get called and I get the required new line added to the end of the file. However when I read the objects back in, they get created fine, but as the archive reaches the end of file, it throws a stream error. I have tested the example code and that works fine, so I'm stuck at the mo. Unfortunately i can't try writing/reading the objects as binary easily. I presume the archive is trying to read past the end of the stream, but I don't know why as the newline exists? I've tried the following to make sure the stream is good, but archive still throws. while(stream.good()) { archive >> object; } Any help would be appreciated. Thanks. Lee MacDonald Schneider Trading 4th Floor, 25 Copthall Avenue London EC2R 7BP -------------------------------------------------------- Message from: lee.macdonald(a)schneidertrading.com Message to: boost-users(a)lists.boost.org Attached files: 0 This e-mail and any files transmitted with it are confidential, may be legally privileged, and are for the sole use of the intended recipient. Copyright in this e-mail and any accompanying document created by us is owned by us. If you are not the intended recipient of this e-mail or any part of it please telephone our IT Department at the number shown above or by e-mail at info(a)schneidertrading.com. You should not use or disclose to any other person the contents of this e-mail or its attachments (if any), nor take copies. This e-mail is not a representation or warranty and is not intended nor should it be taken to create any legal relations, contractual or otherwise. Schneider Trading Associates Ltd (Registration No. 3692131) is incorporated in England and Wales and the registered office is at 25 Copthall Avenue, London EC2R 7BP. The company is authorised and regulated by the Financial Services Authority

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about delete elements from compressed_matrix
by Peng Wang 13 Jan '09

13 Jan '09

Hi, Dear all, Suppose I want to delete those elements whose values are smaller than 0.5 from compressed_matrix. I have looked for the mailing list but could not find a solution. Could you tell me how I can do this? Thank you very much in advance. Sincerely yours, Wang

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Random Numbers using Boost.
by Atul Kulkarni 13 Jan '09

13 Jan '09

Hi All, I am using boost::random for generating random numbers I am using the default quick start code given up on the web page. I want to generate random numbers between range 1 - n so that they do not repeat themselves for at least n numbers. 1. Is it possible using boost::random? 2. If it is possible what do I need to do except the below code. == boost::mt19937 rng1; boost::uniform_int<> six1(1,30); boost::variate_generator<boost::mt19937&, boost::uniform_int<> > die1(rng1, six1); for(int i=0; i < 29; i++) { cout<<die1()<<endl; } == Thanks in advance. -- Regards, Atul Kulkarni Teaching Assistant, Department of Computer Science, University of Minnesota Duluth Duluth. 55805. www.d.umn.edu/~kulka053

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