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[multi_index] fast_pool_allocator not working with MI in 1.35?
by Filip Konvička 24 Apr '08

24 Apr '08

Hi, trying to use fast_pool_allocator in Boost 1.35 fails with MSVC 9.0; it worked well with MSVC 8.0. The following code fragment shows the error: #include <boost/multi_index_container.hpp> #include <boost/multi_index/indexed_by.hpp> #include <boost/multi_index/sequenced_index.hpp> #include <boost/multi_index/identity.hpp> #include <boost/pool/pool_alloc.hpp> using namespace boost; using namespace boost::multi_index; typedef multi_index_container<int, indexed_by<sequenced<> >, fast_pool_allocator<int> > IntSet; IntSet s; Below you can see the compiler error message. Am I doing something wrong? (From what I've seen digging through the code, it seems to me that the allocator gets rebound from int to void, which does not work for fast_pool_allocator.) Thanks, Filip C:\lib\Boost-1_35_0\include\boost-1_35\boost/pool/pool_alloc.hpp(130) : error C2182: 'reference' : illegal use of type 'void' C:\lib\Boost-1_35_0\include\boost-1_35\boost/detail/allocator_utilities.hpp(149) : see reference to class template instantiation 'boost::fast_pool_allocator<T,UserAllocator,Mutex,NextSize>' being compiled with [ T=void, UserAllocator=boost::default_user_allocator_new_delete, Mutex=boost::details::pool::default_mutex, NextSize=32 ] C:\lib\Boost-1_35_0\include\boost-1_35\boost/detail/allocator_utilities.hpp(158) : see reference to class template instantiation 'boost::detail::allocator::rebinder<Allocator>::result<Type>' being compiled with [ Allocator=boost::fast_pool_allocator<void,boost::default_user_allocator_new_delete,boost::details::pool::default_mutex,32>, Type=boost::multi_index::detail::sequenced_index_node_impl<boost::fast_pool_allocator<void,boost::default_user_allocator_new_delete,boost::details::pool::default_mutex,32>> ] C:\lib\Boost-1_35_0\include\boost-1_35\boost/mpl/eval_if.hpp(63) : see reference to class template instantiation 'boost::detail::allocator::compliant_allocator_rebind_to<Allocator,Type>' being compiled with [ Allocator=boost::fast_pool_allocator<void,boost::default_user_allocator_new_delete,boost::details::pool::default_mutex,32>, Type=boost::multi_index::detail::sequenced_index_node_impl<boost::fast_pool_allocator<void,boost::default_user_allocator_new_delete,boost::details::pool::default_mutex,32>> ] C:\lib\Boost-1_35_0\include\boost-1_35\boost/detail/allocator_utilities.hpp(170) : see reference to class template instantiation 'boost::mpl::eval_if_c<C,F1,F2>' being compiled with [ C=false, F1=boost::detail::allocator::partial_std_allocator_rebind_to<boost::fast_pool_allocator<void,boost::default_user_allocator_new_delete,boost::details::pool::default_mutex,32>,boost::multi_index::detail::sequenced_index_node_impl<boost::fast_pool_allocator<void,boost::default_user_allocator_new_delete,boost::details::pool::default_mutex,32>>>, F2=boost::detail::allocator::compliant_allocator_rebind_to<boost::fast_pool_allocator<void,boost::default_user_allocator_new_delete,boost::details::pool::default_mutex,32>,boost::multi_index::detail::sequenced_index_node_impl<boost::fast_pool_allocator<void,boost::default_user_allocator_new_delete,boost::details::pool::default_mutex,32>>> ] C:\lib\Boost-1_35_0\include\boost-1_35\boost/multi_index/detail/seq_index_node.hpp(36) : see reference to class template instantiation 'boost::detail::allocator::rebind_to<Allocator,Type>' being compiled with [ Allocator=boost::fast_pool_allocator<void,boost::default_user_allocator_new_delete,boost::details::pool::default_mutex,32>, Type=boost::multi_index::detail::sequenced_index_node_impl<boost::fast_pool_allocator<void,boost::default_user_allocator_new_delete,boost::details::pool::default_mutex,32>> ] C:\lib\Boost-1_35_0\include\boost-1_35\boost/multi_index/detail/seq_index_node.hpp(148) : see reference to class template instantiation 'boost::multi_index::detail::sequenced_index_node_impl<Allocator>' being compiled with [ Allocator=boost::fast_pool_allocator<void,boost::default_user_allocator_new_delete,boost::details::pool::default_mutex,32> ] C:\lib\Boost-1_35_0\include\boost-1_35\boost/multi_index/detail/seq_index_node.hpp(162) : see reference to class template instantiation 'boost::multi_index::detail::sequenced_index_node_trampoline<Super>' being compiled with [ Super=boost::multi_index::detail::index_node_base<int,boost::fast_pool_allocator<int>> ] C:\lib\Boost-1_35_0\include\boost-1_35\boost/multi_index/sequenced_index.hpp(95) : see reference to class template instantiation 'boost::multi_index::detail::sequenced_index_node<Super>' being compiled with [ Super=boost::multi_index::detail::index_node_base<int,boost::fast_pool_allocator<int>> ] C:\lib\Boost-1_35_0\include\boost-1_35\boost/multi_index_container.hpp(86) : see reference to class template instantiation 'boost::multi_index::detail::sequenced_index<SuperMeta,TagList>' being compiled with [ SuperMeta=boost::multi_index::detail::nth_layer<1,int,boost::multi_index::indexed_by<boost::multi_index::sequenced<>>,boost::fast_pool_allocator<int>>, TagList=boost::mpl::vector0<boost::mpl::na> ] .\relink.cpp(97) : see reference to class template instantiation 'boost::multi_index::multi_index_container<Value,IndexSpecifierList,Allocator>' being compiled with [ Value=int, IndexSpecifierList=boost::multi_index::indexed_by<boost::multi_index::sequenced<>>, Allocator=boost::fast_pool_allocator<int> ]

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Re: [Boost-users] Applying Boost license to non boost projects (e r)
by Robert Marion 24 Apr '08

24 Apr '08

> i have written some primitives to be used with Boost.Accumulators, and > i'm considering to make them available. these files are mostly *.hpp and > depend on boost headers. under what license is it preferable that I > distribute them under? Hi, That depends on your intention. The BSD style and MIT style licenses are permissive, attribution licenses. The Boost is also a permissive license. GPL and LGPL are constrained so that anyone using your code will have to make theirs open source (depending on how it is used, in the later case). If you are writing *for* Boost, the responsible thing to do is use the Boost license. If not, and you are looking for a permissive attribution license, then I suggest either the BSD or MIT style because they are commonly known. There are many other licenses, such as Apache, CDDL, etc. If you want to guarantee your code remains open source, then GPL or LGPL are a good choice (but many persons/companies will choose not to use your code if it falls under one of those licenses). Yours, Robert Marion http://www.palamida.com

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Re: [Boost-users] [iterators] NULL pointer initialization and comparison using iterator_facade
by Lang Stefan 24 Apr '08

24 Apr '08

> > > > Is it possible to construct metafunctions that allow a > function argument > > of NULL, but not any other integer value? Or at least cause > the compiler > > to call out whenever a non-NULL argument is provided? > > > > Cheers, > > Stefan > > struct convertible_from_null { > struct null_pointer_impl_t; > typedef null_pointer_impl_t > (convertible_from_null::*null_pointer_t)(); > convertible_from_null(null_pointer_t* = 0) {} > }; > > convertible_from_null test = 0; > > //convertible_from_null fail = 1; > > int main() {} > > In Christ, > Steven Watanabe > Thanks a lot, this did it! I also managed to adapt this construct to provide comparison operators for comparisons with NULL values, so all my issues have been resolved. :) So now, apart from direct pointer assignments and delete statements (which I know need to be fixed anyway) my array iterator mostly behaves like a pointer. Fortunately, thanks to Steven's suggestion, the compiler does now show up all the problematic statements. Cheers, Stefan

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How to build and use boost 1.3.3.1 in visual studio 2008
by Ie Siong Fat 24 Apr '08

24 Apr '08

How to build and use boost 1.3.3.1 in visual studio 2008, I can't build boost. Can someone explain me ? -- Regards, Ie Siong Fat

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Re: [Boost-users] [serialization]1.35problemwith explicitinstantiation
by Michael Seibt 23 Apr '08

23 Apr '08

Robert Ramey wrote: > Peter Dimov wrote: > > Robert Ramey: > >> Peter Dimov wrote: > > > >> I believe that making a *.cpp file with the macros > >> BOOST_CLASS_EXPORT(T) would be exactly equivalent to the above. > > > > Well, it depends on where the .cpp file is. If it's part of the static > > library, it will not be included by the linker because there are no > > references to it. But it is true that > > What I meant was that if you want to make sure the stuff in the > static library is linked in, just make a small *.cpp file as part > of your main program which includes the BOOST_CLASS_EXPORT > macros. > > #include "a.hpp" > #include "b.hpp" > ... > > BOOST_CLASS_EXPORT(A) > BOOST_CLASS_EXPORT(B) This *.cpp file won't be such little! If those headers contained templates each user of the static library had to compile the template instances again. (I have a multitude of executables and dynamic libraries that use the same template code.) If you have access to the object files linked into this static library you should link them directly into every using project instead of the static library (as suggested in earlier post). MSVC 2005 and 2008 have a linker option that does this trick if the static library is part of the same solution: "Use Library Dependency Inputs" at the tab "Linker | General". (I searched the options several times until I recognized that this option could be relevant...)

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[Conversion] numeric_cast from floating to integral types
by Rainer Thaden 23 Apr '08

23 Apr '08

Hi all, I just discovered (by debugging instead of reading :-() that a numeric_cast from a floating to an integral type always truncates by default, that is, 26.99999 is casted to 26. Is there a way to tell numeric_cast to use the nearest integer? Of course I can add 0.5 to my value and cast afterwards but that's definitely ugly. Thanks in advance. Best regards, Rainer

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[asio] obtaining a socket descriptor from ip::tcp::socket
by Matthias Vallentin 23 Apr '08

23 Apr '08

Hello, I would like to incorporate asio into my current project. However, I am restricted by a library that uses C-style socket descriptors to identify sockets, e.g. it contains functions similar to void foo(int fd, ...) Right now, I picture write an asio server that merely performs an asynchronous accept. Thereafter, the start() function in handle_accept() (see below) would invoke calls to the library such as foo(fd, ...) and spawn a dedicated thread per client that would gather data from the socket. void Server::handle_accept(const boost::system::error_code& e) { if (! e) { new_connection_->start(); new_connection_.reset(new Connection(...) //... In this example, asio would only be used to to handle the accept() and provide an outside interface to the rest of the application while the actual read()/write() calls are capsulated in the library. Is there a way to obtain a native socket descriptor from an ip::tcp::socket object? I am aware that mixing asio with C-style networking code totally breaks platform independence and it is generally a very ugly approach. On the other side, the C-style library would be capsulated behind one asio Server object, without interacting with the remaining application code. I appreciate any input on this issue, Matthias -- Matthias Vallentin vallentin(a)icsi.berkeley.edu pgp/gpg: 0x37F34C16

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[iostreams] write function for sink
by Edward Diener 23 Apr '08

23 Apr '08

In iostreams I am creating a sink device and implementing the write function. In certain situations I do not want to write anything to the sink. In that case should I be passing back 0 as the streamsize or some other value ? BTW clicking on 'sink' in the individual classes list brings me to the page for 'device' not 'sink'.

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Older Simpler Boost Library List
by Ray Burkholder 23 Apr '08

23 Apr '08

I see a current list of libraries at http://www.boost.org/doc/libs/1_35_0. On the old site, there was a nice table based grouping of libraries. I'm thinking it was easier to find something in the old table than on the new page. Does a 1.35.1 version of the old table style exist somewhere? -- Scanned for viruses and dangerous content at http://www.oneunified.net and is believed to be clean.

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[serialization] Re-serialization ??
by Robert Bielik 23 Apr '08

23 Apr '08

Is there a way to do a "re-serialization" of an object structure? Let's say I have a couple of objects, and I serialize them to "State A", then change a few things. Ideally, I'd like to just deserialize "State A" so that I get the objects back to that state, without boost::serialization creating new objects for me. Is it doable? (it is for an undo implementation) TIA /Rob

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