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Re: [Boost-users] [CONFIG] static const definitionsRe: Boost-users Digest, Vol 3373, Issue 1
by John M. Dlugosz 01 Mar '13

01 Mar '13

On 2/28/2013 11:29 AM, boost-users-request-at-lists.boost.org |Boost/Allow to home| wrote: > I've not come across that one before - do you have an example? > > John. It's happening to me. I don't have time to make a full project to post, but from the linker error I think that the ingredients are: * have an initialized static const member in a header file * used in more than one CPP file * "use" means something that isn't a compile-time value only; passing to a function taking a const& argument seems to do so. Maybe force the issue for testing by actually taking its address. * Define the (non-initialized) member in a different CPP file. * I was using a Debug build, in case that matters. * Visual Studio 2010, 32-bit code. I get a linker error in that the symbol was already defined. Using it (as an lvalue) defines it in such a way that duplicates are tolerated; an actual definition conflicts with those. It occurred to me that maybe it doesn't happen in Boost because the error does not occur for templates, which are different in that the compiler must take care of duplicates from different translation units, normally.

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[CONFIG] static const definitions
by John M. Dlugosz 28 Feb '13

28 Feb '13

On 2/27/2013 5:09 AM, boost-users-request-at-lists.boost.org |Boost/Allow to home| wrote: > In fact even when initialized inline, an out of line definition should > always be provided as different compilers have different ideas about what > constitutes "use" of the variable (rather than just the value). MSVC pretty > much never requires an out-of-line definition for example, where as GCC will > often generate linker errors if you don't provide it. The problem is that MSVC is _prohibiting_ an out-of-line definition! (Visual Studio 2010)

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[PBGL] Bug? problem removing self loop in graph parallel
by bminano 28 Feb '13

28 Feb '13

Hello, I have a problem removing edges a graph in pbgl. There are concretely self loops. I think it could be a bug in the library, because for the monoprocessor library it works. I use remove_edge_if to delete the self-loops. The bgl code works ok, but the pbgl code does not. The problem occurs looking the in_egdes of the vertex 8. It detects that it have a in_edge from 8, but when looking for the out_edges of 8 it does not appears as expected. Maybe it is a misconfiguration, but i don't think so. I attached the monoprocessor code and the multiprocessor one if someone wants to look at them. Please, could someone help me? Thank you elimina_vertices.cpp <http://boost.2283326.n4.nabble.com/file/n4643588/elimina_vertices.cpp> elimina_vertices_mono.cpp <http://boost.2283326.n4.nabble.com/file/n4643588/elimina_vertices_mono.cpp> -- View this message in context: http://boost.2283326.n4.nabble.com/PBGL-Bug-problem-removing-self-loop-in-g… Sent from the Boost - Users mailing list archive at Nabble.com.

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Adding indexes + serialization for MultiIndex
by Sohail Somani 28 Feb '13

28 Feb '13

I haven't actually happened upon this problem yet but I just want to know if I know how to deal with it for the future. My question is: how does the serialization work (or not work) if we add or remove indexes from the type? My suspicion is that one would have to do something like this: // version 1: BOOST_CLASS_VERSION(Thingy,1); typedef multi_index_container<thing,indexes> myset1_t; myset1_t m_MySet; ... template<typename Ar> void serialize(Ar & a, unsigned int) { ar & m_MySet; } // version 2 BOOST_CLASS_VERSION(Thingy,2); typedef multi_index_container<thing,indexes> myset1_t; typedef multi_index_container<thing,indexes2> myset2_t; myset2_t m_MySet; // using new version ... template<typename Ar> void serialize(Ar & a, unsigned int fv) { if(Ar::is_loading && fv == 1) { myset1_t set; ar & set; m_MySet.clear(); m_MySet.insert(m_MySet.begin(),set.begin(),set.end()); } else ar & m_MySet; } Would this be OK, errors in syntax aside? Thanks, Sohail

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[Geometry] please help; using buffer() extensions
by John Lilley 28 Feb '13

28 Feb '13

(sorry another post; someone told me to put [library name] in [] in subject... learning something new every day :) Something of a repost, but I've learned a bit more on the path to being truly confused. It appears that boost\geometry\extensions\algorithms\buffer\buffer_inserter.hpp contains some specializations for buffering other shape types? But I'm out of my depth here... is there an example? What do I need to do in order to buffer: a point? A linestring? A vector of polygons? A heterogeneous collections of shapes? Is this generalization of buffer also going to work as a "deflate" for polygons? If someone can tell me "include these headers, use these algorithms", it will help a lot! Thanks John

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[CONFIG] static const definitions
by John M. Dlugosz 28 Feb '13

28 Feb '13

I ran into a compiler idiosyncrasy, and my usual approach is to use the macros and mechanisms that Boost does in the same situation. But I can't find what I'm looking for in the Boost.Config documentation. So what does Boost do here? I found that the VS2010 compiler automatically defines a static const member that has been initialized inline in the declaration, and thus supplying a (required!) definition without the initializer at namespace or file scope will give a linker error if the class declaration is in a header that appears in more than one translation unit. At least one other compiler does in fact require the bare definition to link properly, and doesn't generate it automatically as an enhancement. So I need to make these definitions conditional based on the platform (and perhaps the exact compiler version? That's why I like to use the existing config knowledge base!) I see that Boost has BOOST_STATIC_CONSTANT but that is for compilers that don't have the in-class initialization at all. So if Boost is using such constructs, how does it deal with the linker idiosyncrasy?

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Emplace for Boost heaps
by Rob Patro 27 Feb '13

27 Feb '13

Hi, I'm trying to use the emplace function for the Boost heaps. I've come up with a minimal example (attached), but when I compile it I get the following error: In file included from testpq.cpp:1:0: > > /opt/local/include/boost/heap/skew_heap.hpp: In instantiation of >> 'boost::heap::skew_heap<T, A0, A1, A2, A3, A4, A5, A6>::node_pointer >> boost::heap::skew_heap<T, A0, A1, A2, A3, A4, A5, >> A6>::emplace_internal(Args&& ...) [with Args = {int, int}; T = thing; A0 = >> boost::heap::compare<cmpthings>; A1 = boost::parameter::void_; A2 = >> boost::parameter::void_; A3 = boost::parameter::void_; A4 = >> boost::parameter::void_; A5 = boost::parameter::void_; A6 = >> boost::parameter::void_; boost::heap::skew_heap<T, A0, A1, A2, A3, A4, A5, >> A6>::node_pointer = boost::heap::detail::skew_heap_node<thing, false>*]': > > /opt/local/include/boost/heap/skew_heap.hpp:769:13: required from >> 'static void boost::heap::skew_heap<T, A0, A1, A2, A3, A4, A5, >> A6>::push_void::emplace(boost::heap::skew_heap<T, A0, A1, A2, A3, A4, A5, >> A6>*, Args&& ...) [with Args = {int, int}; T = thing; A0 = >> boost::heap::compare<cmpthings>; A1 = boost::parameter::void_; A2 = >> boost::parameter::void_; A3 = boost::parameter::void_; A4 = >> boost::parameter::void_; A5 = boost::parameter::void_; A6 = >> boost::parameter::void_; boost::heap::skew_heap<T, A0, A1, A2, A3, A4, A5, >> A6> = boost::heap::skew_heap<thing, boost::heap::compare<cmpthings> >]' > > /opt/local/include/boost/heap/skew_heap.hpp:437:70: required from >> 'typename boost::mpl::if_c<boost::heap::skew_heap<T, A0, A1, A2, A3, A4, >> A5, A6>::is_mutable, typename boost::mpl::if_c<boost::heap::skew_heap<T, >> A0, A1, A2, A3, A4, A5, A6>::is_mutable, typename boost::heap::skew_heap<T, >> A0, A1, A2, A3, A4, A5, A6>::implementation_defined::handle_type, >> void*>::type, void>::type boost::heap::skew_heap<T, A0, A1, A2, A3, A4, A5, >> A6>::emplace(Args&& ...) [with Args = {int, int}; T = thing; A0 = >> boost::heap::compare<cmpthings>; A1 = boost::parameter::void_; A2 = >> boost::parameter::void_; A3 = boost::parameter::void_; A4 = >> boost::parameter::void_; A5 = boost::parameter::void_; A6 = >> boost::parameter::void_; typename >> boost::mpl::if_c<boost::heap::skew_heap<T, A0, A1, A2, A3, A4, A5, >> A6>::is_mutable, typename boost::mpl::if_c<boost::heap::skew_heap<T, A0, >> A1, A2, A3, A4, A5, A6>::is_mutable, typename boost::heap::skew_heap<T, A0, >> A1, A2, A3, A4, A5, A6>::implementation_defined::handle_type, void*>::type, >> void>::type = void]' > > testpq.cpp:27:20: required from here > > /opt/local/include/boost/heap/skew_heap.hpp:808:9: error: no matching >> function for call to 'boost::heap::skew_heap<thing, >> boost::heap::compare<cmpthings> >::make_node(int, int)' > > /opt/local/include/boost/heap/skew_heap.hpp:808:9: note: candidates are: > > In file included from /opt/local/include/boost/heap/skew_heap.hpp:21:0, > > from testpq.cpp:1: > > /opt/local/include/boost/heap/detail/stable_heap.hpp:189:19: note: >> boost::heap::detail::heap_base<T, Cmp, constant_time_size, >> StabilityCounterType, stable>::internal_type >> boost::heap::detail::heap_base<T, Cmp, constant_time_size, >> StabilityCounterType, stable>::make_node(const T&) [with T = thing; Cmp = >> cmpthings; bool constant_time_size = true; StabilityCounterType = long >> unsigned int; bool stable = false; boost::heap::detail::heap_base<T, Cmp, >> constant_time_size, StabilityCounterType, stable>::internal_type = thing] > > /opt/local/include/boost/heap/detail/stable_heap.hpp:189:19: note: >> candidate expects 1 argument, 2 provided > > /opt/local/include/boost/heap/detail/stable_heap.hpp:195:10: note: T&& >> boost::heap::detail::heap_base<T, Cmp, constant_time_size, >> StabilityCounterType, stable>::make_node(T&&) [with T = thing; Cmp = >> cmpthings; bool constant_time_size = true; StabilityCounterType = long >> unsigned int; bool stable = false] > > /opt/local/include/boost/heap/detail/stable_heap.hpp:195:10: note: >> candidate expects 1 argument, 2 provided > > It seems that something is amiss with the perfect forwarding (or I'm somehow using emplace incorrectly). Either way, any help getting this to work or figuring out why it doesn't would be greatly appreciated. Thanks, Rob

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Fwd: Boost.Locale - Help linking to ICU static libraries please
by Brad Keifenheim 27 Feb '13

27 Feb '13

Hello, I'm building Boost 1.53.0 on FreeBSD using GCC. I wish to provide the ICU back-end to Boost.Locale using the static implementation only. This is the command line I used to configure and build ICU 49.1.2: runConfigureICU FreeBSD --prefix=/3rdParty/icu4c/release --bindir=/3rdParty/icu4c/release/bin64 --sbindir=/3rdParty/icu4c/release/sbin64 --libdir=/3rdParty/icu4c/release/lib64 --enable-static=yes --enable-shared=no --with-library-bits=64 CPPFLAGS=-DU_TIMEZONE=0 The DU_TIMEZONE flag is a workaround for ICU on FreeBSD for that particular version. For this discussion it may safely be ignored. The ICU build results as follows: /3rdParty/icu4c/release |_ bin64 |_ include |_ lib64 |_ sbin64 |_ share As intended, the shared (*.so) libraries are not built. Only static (*.a) libraries are present in lib64: libsicudata.a, libsicui18n.a, libsicuio.a, etc... I then attempt the following command to build Boost: b2 toolset=gcc link=static variant=release threading=multi address-model=64 --build-dir=obj --stagedir=bin/64 --without-python -sICU_PATH=/3rdParty/icu4c/release/ --layout=versioned -a -j8 With this setup the build reports as follows: *...* * * *Performing configuration checks* * * * - x86 : yes* * - has_icu builds : no* *warning: Graph library does not contain MPI-based parallel components.* *note: to enable them, add "using mpi ;" to your user-config.jam* * - iconv (libc) : no* * - iconv (separate) : no* * - icu : no* * - icu (lib64) : no* *- Boost.Locale needs either iconv or ICU library to be built.* * * *...* I do not have this problem when -sICU_PATH points to a directory containing the shared versions of the ICU libraries: libicudata.so, libicui18n.so, libicuio.so ... Unfortunately the constraints of the end product restrict me from delivering ICU as a shared library. Will Boost.Locale accept the ICU back-end as a static library implementation? If so, what have I configured improperly? Thank you in advance for your assistance. Brad

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[CONFIG] static const definitions
by John M. Dlugosz 27 Feb '13

27 Feb '13

On 2/27/2013 1:23 PM, boost-users-request-at-lists.boost.org |Boost/Allow to home| wrote: > Exactly, hence my suggestion for performing a preprocessor check > around the out-of-line definition. I suppose it would be nice to have > a BOOST-y preprocessor def that could let you know if this is the > case... OK, now we're getting somewhere. You understand that this is exactly what I _am_ doing. My questions is, how does Boost determine which compilers in which it should withhold the definition? Do you know of an example of one someplace?

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[CONFIG] static const definitions
by John M. Dlugosz 27 Feb '13

27 Feb '13

On 2/27/2013 10:35 AM, boost-users-request-at-lists.boost.org |Boost/Allow to home| wrote: > ...and then we use preprocessor checks to decide whether or > not to provide definitions in a cop [cpp?] file. It is best to provide them for > gcc, but not for msvc 2010 for example. Yes, exactly. So what macro does CONFIG provide to determine whether they should be present or absent?

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