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[mpl] weird crash on MSVC 6.5
by Joaquín Mª López Muñoz 24 Jan '05

24 Jan '05

The following simple snippet ICEs in MSVC 6.5: #include <boost/mpl/vector_c.hpp> #include <boost/mpl/assert.hpp> template<int N> struct foo:boost::mpl::vector_c<int,N> { }; Yet, this version (where assert.hpp is included first) compiles fine: #include <boost/mpl/assert.hpp> #include <boost/mpl/vector_c.hpp> template<int N> struct foo:boost::mpl::vector_c<int,N> { }; The situation is the same if I change vector_c for list_c. With plain vectors and lists, however, everytihng's fine. ????? Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

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boost::result_of
by John Maddock 24 Jan '05

24 Jan '05

I can't seem to get the result_of template to function, I've tried: #include <boost/utility/result_of.hpp> typedef boost::result_of<F>::type t; with F= int (double) int (*)(double) int (&)(double) std::unary_function<double,int> and all give a long list of errors. I believe that all of these should be OK? So am I doing something obvious wrong (I'm using VC7.1 BTW in case that makes a difference)? Thanks, John.

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Solving stuff.
by Le Farfadet Spatial 23 Jan '05

23 Jan '05

Hello everybody out there ! I am Yoann LE BARS. I am french, so please excuse my hesitating english. I have post on http://boost-sandbox.sourceforge.net/vault/ the file inverse.tar.gz, which contains a method to inverse matrix using uBlas. When I ask on Boost user's list if someone if interessted on some code I have made which solve general linear systems (square non singular, singular square, unsquare), Jonathan Turkanis invit me to send a description of it into the developers list, so I come here (I hope that it is the good list). So, I have implement some code which solve general linear systems, using restarted GMRES and least square method. Of course, it use Boost (uBlas) and the data waiting are matrix_expression and vector_expression. I can upload this code on the Boost Sandbox, if anyone is interessted on. Best regards. Yoann LE BARS

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How to extract tuple element in lambda function?
by Iggy Veresov 23 Jan '05

23 Jan '05

Can anybody enlighten me, how to extract a tuple element in lambda function? A straight-forward approach of binding corresponding get<> member-function doesn't comple.. using namespace boost::lambda; boost::tuple<int,int> t(1,2); std::cout << bind(&boost::tuple<int,int>::get<0>, _1)(t); Thanks in advance! /Ig

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Latest TR draft available
by Beman Dawes 23 Jan '05

23 Jan '05

The latest draft of the C++ Standard Library Technical Report is available. See http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1745.pdf AFAIK, this is the version that will go to ISO for the long process of formal voting. Thus it is the one Boosters should use; it contains a lot of minor fixes that turned up during the final editing. --Beman

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Re: [iterator] small feature request
by David Abrahams 23 Jan '05

23 Jan '05

Eric Niebler wrote: > The iterator_adaptor<> template has a base() function to access the > underlying iterator. Well and good. However, iterator_adaptor<> doesn't > have a public typedef for the iterator type returned from this function. > Can it be added? > > Rationale: > Given some iterator of type T that is built of an unknown number of > adaptors, extract the underlying iterator. Consider: > > template<class Iter> > typename disable_if<is_adapted<Iter>,Iter>::type > base(Iter const & it) > { > return it; > } > > template<class D,class B,class V,class T,class R,class Di> > ?????????? > base(iterator_adaptor<D,B,V,T,R,Di> const & it) > { > return base(it.base()); > } > > I can't think of a way to write the return type of the second overload. > If iterator_adaptor had a nested typedef for its Base template > parameter, this would be very straightforward. Seems reasonable. Can you submit a patch? -- Dave Abrahams Boost Consulting http://www.boost-consulting.com

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Re [boost] Composites and Visitors
by Dave Handley 23 Jan '05

23 Jan '05

Jason Hise wrote: > I have no familiarity with these patterns, so my range of suggestions is > fairly limited. However, I did notice one way that you might be able to > make the composite more generic. Your composite library currently > forces the client to set up the hierarchy with raw pointers. Would it > be reasonable to ask that it allow smart pointers as well? It would > seem that this would be as easy as making the template parameter the > pointer type instead of the object type, as the plain object type > doesn't (appear to) be used anywhere. Thanks for the suggestion - I've actually been working on this, along with some other memory management policies. The smart pointer policy is relatively simple, although not quite as easy as making the template parameter a pointer type since I use new, delete and clone in the framework. Nevertheless, I should be able to get that policy up and running pretty quickly. I was also trying to create a further policy that used a single type and stored it by value rather than by pointer (like normal STL containers) - unfortunately, the policy for that is proving much harder than I originally thought. I'l probably abandon my second idea and just publish policies for smart_ptr and normal pointer versions of the code. > (btw, have you tried out my singleton longevity lifetime policy yet? ;) ) I've browsed the code, but unfortuantely, I've spent a week away on business so haven't had a time to use it in anger yet, or study the code in any detail. My first impression is that you have done a good job - but I'll get back later in the week with a more detailed review. Dave Handley

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Help requested building and running tests
by Jody Hagins 23 Jan '05

23 Jan '05

I apologize in advance. I can not figure out how to get tests to build and run correctly from within subdirectories. The --builddir option does not seem to be honored, and the Jamfiles are so "simple" that I haven't a clue as to what is happening. To be honest, I have made several attempts at using bjam, but the only thing I can get to work is a toplevel make of everything. So, for all my own stuff, I have been using a mirror hierarchy and Makefiles (since that is what I have been using for the last 2 decades). However, I now want to get some code ready for submission (I have moved type_id and in the process have written a dynamic library wrapper as well). Unfortunately, I can not get my tests to integrate very well within boost. Thus, I humbly ask for any pointers and/or assistance in this regard. Thanks!

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Extra '\r' in lines
by Victor A. Wagner Jr. 23 Jan '05

23 Jan '05

The following lines have an extra '\r' before then "newline" in them. For reasons that are obscure (to me, I'm SURE there's a great marketing reason for this) VC-8.0 bitches about them being Mac files and refuses to compile them. File: T:\Projects\boost\libs\test\example\unit_test_example3.cpp File: T:\Projects\boost\libs\test\test\class_properties_test.cpp File: T:\Projects\boost\libs\test\test\errors_handling_test.cpp File: T:\Projects\boost\libs\test\test\fixed_mapping_test.cpp File: T:\Projects\boost\libs\test\test\parameterized_test_test.cpp File: T:\Projects\boost\libs\test\test\result_report_test.cpp File: T:\Projects\boost\libs\test\test\test_case_template_test.cpp File: T:\Projects\boost\libs\test\test\test_fp_comparisons.cpp File: T:\Projects\boost\libs\test\test\test_tools_test.cpp of course this causes problems in my regression runs using VC-8.0 Victor A. Wagner Jr. http://rudbek.com The five most dangerous words in the English language: "There oughta be a law"

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Composites and Visitors
by Dave Handley 23 Jan '05

23 Jan '05

Following on from a post I made about a week ago regarding a templatised composite, a version of an acyclic visitor, and a version of this visitor designed to visit composite trees, I have uploaded these files to the boost sandbox in a file called composite_visitor.zip. I have included some basic instructions on how to use the classes. I would appreciate some feedback on whether there would be any interest in submitting these for inclusion in Boost. Also I would be interested in any thoughts regarding potential improvements to the templates. Thanks Dave Handley

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