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BOOST_STATIC_ASSERT
by Edward Grace 11 Oct '05

11 Oct '05

Dear All, I am encountering a problem with BOOST_STATIC_ASSERT, it is producing compile-time errors that are a little cryptic. When using BOOST_STATIC_ASSERT such as class rtm : public matrix<ElementType> { BOOST_STATIC_ASSERT(::boost::is_float<ElementType>::value || ejg::boost::is_complex<ElementType>::value); public: ... ... .. Instantiation of the rtm class with a non float or non complex type, such as: ejg::oned::rtm<char> M; causes the following compiler error. error: invalid application of sizeof to incomplete type boost::STATIC_ASSERTION_FAILURE<false> Boost 1.32.0 g++ 4.0.1 Obviously generating a compiler error is the correct behaviour, I want to make sure that only complex or float type objects are instantiated. The problem is that the compiler error is rather cryptic. >From the documentation of boost http://www.boost.org/doc/html/boost_staticassert.html, I should be seeing Illegal use of STATIC_ASSERTION_FAILURE<false> Is there any way this can be improved by generating the error or is it too much of a compiler issue? -ed

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[Boost.Build] unable to cross-compile 1_33_0
by BRIDGES Dick 11 Oct '05

11 Oct '05

My apologies in advance if this question is only for the jamboost mailing list but I very much need to cross-compile boost_1_33_0 and I can't seem to make this version work. # bjam --v2 --version Boost.Build V2 (Milestone10) Boost.Jam 03.01.11 (I haven't received any responses on the jamboost mailing list so I assume I'm formulating my question incorrectly. If there is something wrong with the way I'm asing this question, would someone please point it out to me?) I am trying to compile a host (X86, linux) and a target (ARM9) version of the boost_1_33_0 libraries using the "standard" (Core3) gcc and a gcc-arm cross-compiler. Can someone point me to the documentation that is "authoritative" for 1_33_0 and describes how to configure [which files] and invoke bjam for multiple compilers on the same computer? I found (and read) *LOTS* of historical material describing how to configure and invoke bjam for v1 and v2 for prior versions. Vladimir Prus provided an answer (in the form of a user-config.jam mod) for 1_32_0 last April... <extract> I'd use this: using gcc : 3.4 ; using gcc : 3.4arm : /path/one/arm-g++ : <other stuff> ; using gcc : 3.4ppc : /path/two/ppc-g++ : <other stuff> ; and them bjam gcc-3.4 gcc-3.4arm gcc-3.4ppc </extract> ...which worked fine with 1_32.0, but I can't get it to work with the 1_33_0 version. No matter how I invoke bjam, it seems to interpret the compiler as the target. bjam gcc-3.4arm => "don't know how to make gcc-3.4arm" bjam --v2 gcc-3.4arm => "could not find main target gcc-3.4arm" bjam "-sTOOLS=gcc-3.4arm" => "gcc-3.4arm-tools-jam: No such file..." I've been reduced to "trying things." Any advice or suggestions would be greatly appreciated. Regards, "Desperate" Dick Bridges

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Re: [Boost-users] BOOST XML serialisation c++ libraries with C#
by Prasad, Shyam 11 Oct '05

11 Oct '05

Hi Has anyone tried using BOOST XML serialisation with C#? Is that feasible? Basically the scenario is a C# front end client talking to a C++ back end server via XML messages both sides using Boost XML Serialisation / Deserialisaion framework. Regards SP

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[serialization][any]Do we have serialization support for boost::any?
by Li Lirong 11 Oct '05

11 Oct '05

Hi, Do we have serialization support for boost::any? If not, how is it possible to serialize boost::any? Regards, Lirong

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[BGL] Multiple adaptations of graph
by Andreas Brinck 11 Oct '05

11 Oct '05

Hi, I have a simple directed graph class (let's call it MyGraph) which I want to adapt for BGL algorithms. I've defined the necessary traits and functions (in_edges, target etc.) and everything works fine. Problem is I want to be able to treat the graph as an undirected graph as well when using some of the BGL algorithms, but since the graph_traits are only templatized on the graph type I can't define a new set of traits since graph_traits<MyGraph> is already defined. The only solution I've come up with so far (after 10 minutes of thinking :) is to define a new class, MyDirectedGraph, which is an exact copy of MyGraph and define a set of traits for this new class. And then when I want to use the undirected version of the algorithms on my MyGraph object I cast it to a MyDirectedGraph. Somehow I have a feeling there must be a more robust and elegant way to solve this problem. Regards /A.B. ########################################### This message has been scanned by F-Secure Anti-Virus for Microsoft Exchange. For more information, connect to http://www.f-secure.com/

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Bug in boost::regex_match 1.33.0 Win64/cl1400 and Linux/gcc323
by rlop＠gmx.de 11 Oct '05

11 Oct '05

Hello, After upgrading from boost 1.32 to boost 1.33.0, we get an exception in boost::regex_match. The exception is std::runtime_error: Regular expression too big , and only under Win64/cl1400 and RHEL/gcc323 Changing the regex slightly sometimes avoids the exception... Attached a small example, which can be used to reproduce the exception. #include <boost/regex.hpp> int main(void) { boost::regex validValue = boost::regex("([x]{0,64})?"); boost::regex_match("T",validValue); return 0; } best regards Robert Lopuszanski -- 5 GB Mailbox, 50 FreeSMS http://www.gmx.net/de/go/promail +++ GMX - die erste Adresse f�r Mail, Message, More +++

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Arrays in Boost::Python
by Wyatt Greenway 11 Oct '05

11 Oct '05

How do I acomplish this: class A { public: int *Buffer; vector<string> Array; A() { this->Buffer = new int[10]; /* Set items in Buffer */} } /* Boost code */ class_<A>("A") .def("Buffer", &A::Buffer) .def("Array", &A::Array) ; /*-----*/ And in python it would look like so: > MyA = A() > print MyA.Buffer[0] > MyA.Array.append("Hello world!") > print MyA.Array[0] ??????? Thanks in advance for any help

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boost::any Question
by Piyush Kapadia 10 Oct '05

10 Oct '05

I am new user of Boost, I tried to use boost::variant first, but in comparison to boost::any performance of boost::variant appears to be around 4 times slower, so settled for boost::any. Also boost::any has cleaner interface but I don't know how to query current type information for boost::any ? My code looks like following map<unsigned int, boost::any> result_table; result_table[1] = 543.434; vector<int> vec; .. Some vec population code; result_table[2] = vec; Now I need to develop a stringify function for result_table; I can fetch the results back as boost::any value = result_table[2]; But I need to know the type of value, so that I can treat it accordingly to stringify; I know there exists type_traits, but very limited examples of type_traits is provided on Boost documentation and particularly, I am clueless about how to use type_traits in above context to find out what is the current type returned by result_table[int] Also I want to know if Boost has any Hash map implementation that can be superior in performance compare to regular std::map ?? Thanks, Piyush

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[BGL] Simple question about accessing vertex property
by Giulio Veronesi 10 Oct '05

10 Oct '05

Hi, How do I access the vertex_index property of a vertex? Is it necessary to use the get function? More precisaly, let us consider the following: typedef adjacency_list<vecS, vecS, bidirectionalS, no_property, property<edge_weight_t, int> > TGraph; typedef graph_traits<TGraph>::vertex_descriptor TNode; Suppose that 'vertex' is a TNode. Is it correct to do int idx = vertex; to get in idx the vertex_index of vertex? Thanks in adavnce, Giulio

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Boost Serialization Question.
by Piyush Kapadia 10 Oct '05

10 Oct '05

I am able to use Boost XML and TEXT serialization but Binary Serialization fails to read file, though it can write binary file. Is Binary Serialization fully Supported and if so does it work with STD container classes ?

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