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Cannot build boost on MSVS8 per instructions
by John Zulauf Yahoo 06 Sep '06

06 Sep '06

I am attempting to build and install boost_1_33_1 using the MSVS 8 instructions at http://www.boost.org/tools/build/v1/vc-8_0-tools.html and the prebuilt bjam boost-jam-3.1.13-1-ntx86.zip <http://prdownloads.sourceforge.net/boost/boost-jam-3.1.13-1-ntx86.zip?downl oad> and bjam fails (apparently) with a "send error report" dialog every time it is run. I also tried the instructions at http://lists.boost.org/boost-users/2006/09/21938.php with the same results. What am I doing wrong? Do I have the wrong version of bjam.exe? Why the two different sets of instructions? Best Regards, John Zulauf

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[variant] MSVC7.1 produces an Internal
by Yan Zhang 06 Sep '06

06 Sep '06

Try use /Zi instead of /ZI from C/C++/General/Debug Information Format. Also add /Zm800 in Additional Options from C/C++/Command Line. Yan Eoin wrote: >Hello Yan, thank you for the advice unfortunately I am still getting the >Internal Compiler Errors. This problem is proving to be quite a >show-stopper for my library.

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adding objects as bundled properies
by Tom Lenaerts 06 Sep '06

06 Sep '06

Hi all, I'm completely new to the boost graph library. I was wondering whether instead of defining structs and add them as bundled properties to the vertices and edges one can also simply add classes and insert instances of these classes? If this is possible, can anyone explain how this can be done and what the interface of these classes must look like? ciao Tom

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[BGL] filtered graph missing vertex function
by moritz Hilger 06 Sep '06

06 Sep '06

is there a particular reason that the filtered graph is missing a vertex_descriptor vertex(vertices_size_type, const& filtered_graph) function? of course this would return exactly the same as the one of the underlying graph, nevertheless it would be handy for code treating filtered graphs the same way as normal ones. greetings moritz

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[test] Running either unit tests or normal program based off of command line switches
by Jason House 06 Sep '06

06 Sep '06

As I currently understand boost.test, it provides its own main function. If I want to make a separate executable to run the tests, that seems straight forward. But how would I embed the testing inside a normal program with a simple command-line switch for running them?

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Boost on HPC system
by John Fletcher 06 Sep '06

06 Sep '06

I have been having a discussion with the system maintainer as to how boost should be installed on a cluster system. He has it installed as /apps/gnu64/boost which makes the include files /apps/gnu64/boost/include/boost and the example sources not installed where he expects users to go. It appears not convenient to use /usr/include or /usr/local/include as these are replicated across all the nodes. Can anyone say what has been done at other locations? My ideal is one where it is easy to pick up the header files when needed without having to make complicated provision. Thanks John Fletcher

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[MPL] Help with delayed placeholder expression evaluation
by Thyfate 06 Sep '06

06 Sep '06

Hello ! I have been trying to work with the MPL but I have some problems with the composition and argument binding concepts. 1/ Here is a problem I cannot find a solution for: I would like to have a placeholder expression (S) which takes a single argument which is itself a placeholder expression of 2 arguments (A). I want S when invoked with mpl::apply to return a lambda expression (B) of 1 argument which when invoked on (x) would yield the same result than applying the pair (x, x) to (A). This means I expect apply<S, A> == B and apply<B, x> == apply<A, x, x>. Could someone tell me if this is possible? (I know how to do this without a placeholder expression for (S) but I would like to improve my understanding of them) Typedef int_<1> one; Typedef plus<_1, _2> A; Typedef . S; Typedef typename apply<S, A>::type B; BOOST_STATIC_ASSERT(apply<B, one>::type::value == apply<A, one, one>::type::value) 2/ Why doesn't bind take a placeholder expression ? If I want to remap a placeholder expression, I can do for example: bind<typename lambda<plus<_1, _2>::type, _1, _1> but why doesn't the library invoke lambda by itself ? (bind< plus<_1, _2>, _1, _1> wont work) Is the combination bind/lambda the only way to remap placeholder expressions? 3/ What is the use of protect? Where can I find some examples? Thanks in advance, Charles

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assign shared_ptr to 0 in initialization list
by Scott Amort 06 Sep '06

06 Sep '06

Hello, I am in the process of converting an application that uses raw pointers to boost::shared_ptr. For example: ErrorWriter *writer_; now becomes: typedef boost::shared_ptr<ErrorWriter> ErrorWriterPtr; ErrorWriterPtr writer_; The problem is that, with raw pointers I was able to use 0-value pointers in the constructor, like so: Parser(ErrorWriter *writer) : writer_(writer) { } Parser testParser(0); So it was possible to initialize the class with an empty writer pointer, and then later in some other Parser code do this: if (writer_ == 0) { /* create default error writer */ } But now, with shared_ptr, I cannot assign or evaluate to 0. I understand that the default ErrorWriterPtr constructor and ErrorWriterPtr.reset() will provide me with an empty pointer that I can check like so: if (writer_.get() == 0) { /* create default error writer */ } But how do I rewrite the Parser constructor to fit this new idiom? If I have: Parser(ErrorWriterPtr writer) : writer_(writer) { } What is the equivalent to: Parser testParser(0); Thank you for any assistance! Best, Scott

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graph search algorithm
by kellygp 06 Sep '06

06 Sep '06

I have a undirected graph set on a 2D plane. Imagine the graph looking something like the USA where the edges form the borders of the states. I would like to automatically recognise all of the enclosed regions (the states) by searching the graph and store each state as a subgraph. How can I search the graph returning only the enclosed regions? Thanks, any suggestions appreciated.

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compile error with Boost Function object and templated function (Intel C++ compiler)
by Faheem Mitha 06 Sep '06

06 Sep '06

Hi, The following bit of code using Boost Function compiles fine with gcc 3.3 or later, but has problems with the Intel C++ compiler version 9.1, which produces the following error message. Is this a compiler bug, or is there something wrong with the code? If the former, I'd be grateful for suggestions of a workaround, and if the latter, please tell me what I'm doing wrong. Note that the corresponding version with no templates compiles without problems. Thanks in advance. Faheem. ************************************************************************** icpc -o foo.o -c -Wall -Werror -g -wd383,810,981,1418 cxxlib-icc -DBOOST_RAND -I/usr/local/include/boost-1_33_1 \foo.cpp foo.cpp(12): error: no operator "=" matches these operands operand types are: boost::function<int (), std::allocator<void>> = <unknown-type> choice = &rchoice<dim>; ^ ************************************************************* #include <boost/function.hpp> template<int dim> int rchoice() { return 1; } template<int dim> int foo(void) { boost::function<int ()> choice; choice = &rchoice<dim>; return choice(); } int main() { return foo<2>(); } ***************************************************************

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