March 2012 - Boost - lists.preview.boost.org

Re: [boost] [git] Mercurial?
by Jason Harris 22 Mar '12

22 Mar '12

> >>>>> Dave Abrahams <dave <at> boostpro.com> writes: > > > More attention from the community, more support, more tools work with it, > > more money behind it, more people will be familiar with it in the long run, > > etc., etc. > > Example: compare the number of commercial tools for working with Git, compared > to those available for working with Mercurial. On OS X along I can use: > SourceTree, Tower, GitHub, GitBox, GitDiary, QuickHub, Octopus, and that's > only the commercial tools! > > By contrast, if I search for "mercurial" in the AppStore, I can only use > SourceTree (which works with both). > Well, I am the author of MacHg a very fully featured multithreaded osx client for mercurial. There was murky and a few other clients around for OSX. But for now the scene seems to have settled into MacHg and SourceTree. I would also point out that I think the kiln team will soon have a nice port of TortiseHg to OSX. A partial listing of general tools is here: http://mercurial.selenic.com/wiki/OtherTools (Note I have not put MacHg on the AppStore since it is a bit of a pain trying to sand box the thing. I think Neil (the author of SourceTree) complained about the fact that he could not include compiled python file etc, in the app store version. Also a good GUI should have some command line drivers. Eg from the command line you should be able to enter "machg somerepo" and have it open in MacHg or something similar. (This has been on my to-do list for quite some time.) And such tools contravene the AppStore guidelines. Eg BBedit had to remove such tools from their application in order to get it onto the AppStore. Eg see http://www.barebones.com/store/macappstore.html and the section about the limitations of the AppStore version.)) I would think most developers would not be strictly limited to the AppStore version and a simple google of "OSX mercurial" will turn up MacHg... As to the whole discussion of Mercurial vs Git. I really have to say that both products are quite similar now in what they can do. However, the learning curve for me for git is just not good. Eg just for some simple comparisons do a: [salt:~] ⌘ hg help pull | wc 40 264 1753 [salt:~] ⌘ git help pull | wc 638 3624 29834 These are basically the same commands. Yet, the size of the help entry for pull for mercurial is 6% of the size of the git help entry. That says a lot about the understandability of one system to the other. (cf the size difference for other commands like pull, log, status, etc.) Git has **soo** many bells and whistles. Every so often as a real DVCS ninja git has something that mercurial doesn't have in my experience. Eg there is a feature in git when you are doing a total conversion of a repository you can run a filter over all of the files as you go. (eg imagine you want to convert all of say windows newlines to unix newlines in every version stored in history, or some other repetitive thing like this.) Up until a little while ago Mercurial didn't have that feature. So on the extreme cases there are definitely bits to git where git has more options. However these extra command switches in git are definitely a very sharp double edged sword in that for the average user the number of git options is just insanely huge. Thus I think the mercurial philosophy of trying to keep things clean, organized, and coherent is much better for at least 90% of users if not more like 98% of users. I am sure that each of you and each of your colleagues are gurus in a number of things, but do you want to require that they are gurus in DVCS systems? Even in Mercurial a lot of the users I encounter are sometimes woefully clued in to what is going on, and Mercurial is more streamlined, and cleanly organized than git (in my humble personal experience.) And it isn't all a bed of roses in Mercurial either. Eg there are things one should really watch out for, for example in using sub-repositories (these parallel sub-modules in git) one should use a thin super-repo layer. We got bitten by this at our work and it has caused problems. See eg http://mercurial.selenic.com/wiki/Subrepository#Recommendations Other points to consider: Those people who think you can't edit history in Mercurial or have many "branches" within a repo, their information is years out of date... I edit history and rebase, etc all of the time. It is part of my standard work flows. The arguments about popularity might have some weight but I think Mercurial and Git are definitely both large enough and will stick around. Besides converting one repo to the other in case one disappears is not that difficult. There are tools which interoperate between both formats (se hg-git.) Also, being a GUI writer I would say the number of differences once you are using a GUI is even smaller in day to day usage once you know what is going on. One, difference is with git you have to be careful to name *everything* or you get "detached heads". In mercurial you don't have to worry about this at all. You can happily update to any revision and start working right there without having to remember to name it / think up a name for it. (However, there are certain advantages to naming everything since then you can track revisions across all sorts of history edits, where-as in Mercurial you have to do some of this tracking manually...) (As a GUI writer I have thought about making the changes to MacHg to be able to release MacGit, but ever time I start playing with git it just... I don't know... I can go into details but the details would likely not be relevant here...) In any case, I use boost in my projects and think it's fantastic! Whether you all end up choosing git or hg a DVCS IMHO is much better than a centralized VCS. (However, I haven't used svn extensively since the company I worked for has skipped directly from cvs to mercurial & git.) Also whether you choose hg or git you might want to have an official mirror in the other system... So users can just use the system they want to. Best of luck, Jason

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[accumulator] Problem with 'droppable_accumulator.hpp' (rev. 77432)
by sguazt 21 Mar '12

21 Mar '12

Hello, I have a problem when compiling with the current trunk version (rev. 77432) of Boost.Accumulator: In file included from projects/boost-trunk/boost/accumulators/framework/accumulator_set.hpp:28:0, from projects/boost-trunk/boost/accumulators/accumulators.hpp:12, ... projects/boost-trunk/boost/accumulators/framework/accumulators/droppable_accumulator.hpp: In copy constructor 'boost::accumulators::droppable_accumulator<Accumulator>::droppable_accumulator(const boost::accumulators::droppable_accumulator<Accumulator>&)': projects/boost-trunk/boost/accumulators/framework/accumulators/droppable_accumulator.hpp:173:54: error: expected type-specifier projects/boost-trunk/boost/accumulators/framework/accumulators/droppable_accumulator.hpp:173:54: error: expected '>' projects/boost-trunk/boost/accumulators/framework/accumulators/droppable_accumulator.hpp:173:54: error: expected '(' projects/boost-trunk/boost/accumulators/framework/accumulators/droppable_accumulator.hpp:173:82: error: expected ')' before 'const' My system is: OS: Fedora 14 x86_64 Compiler: GCC 4.6.1 Compiler's Flags: --ansi -pedantic -Wall -Wextra I think you need to change line 173: : droppable_accumulator::base(*static_cast<droppable_accumulator::base const *>(&that)) with the following (note the addition of "typename") : droppable_accumulator::base(*static_cast<typename droppable_accumulator::base const *>(&that)) After this addition all seems to work. Could you fix it, please? Thank you very much. Best, -- Marco

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Please advise: Boost with LLVM Clang and 0x11 dialect ?
by John M. Dlugosz 21 Mar '12

21 Mar '12

Can someone please advise on how to get Boost headers to work when compiling using Clang (as found on Apple OSX/iOS development) when the 0x11 dialect is enabled? We're stuck at Boost 1.47 because 1.48 doesn't even work with the current settings (C++03 dialect). The Mac developers don't want to fiddle with 1.49 without knowing what the deal is. Is there someone who has used Boost on the Apple with Clang who can relate some tales of how it works and offer suggestions? I've had no luck on the Boost.Users mailing list, or a previous post here on Boost.Devel. Is there anyplace else I might ask? At this point, any scrap of wisdom would be appreciated. —John

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Graph properties and GraphML
by Arthur Castonguay 21 Mar '12

21 Mar '12

I'm using 1.49.0 and am attempting to read a GraphML file that has graph attributes on it (example file below). My test program is below too. I've run into two issues. 1. The GraphML reader didn't quite handle them. There was some facilities put in place but it was never glued together. I added some code (patch below) and now it appears that that will do what I want... I'm getting "property not found" exception now. Great... onto item 2. 2. I cannot seem to wire the graph property into the dynamic properties. I've used the same syntax used for node and edge properties: props.property("gattr", get(&GraphProperty::gattr, g)); I've search examples and cannot find an instance of this to see if graph properties are handled differently. It's possible I've just written bad code for #2. I'm still working through the adjacency_list code to see if I can grok what's going on. Figured maybe someone more familiar with this could find the issue quickly. Once functionaly, I'll report a bug regarding item #1 but I want to ensure the writing of the GraphML works as well before doing that (the code appears to write graph attributes.. can't test yet due to item #2). For those that don't want to bother, this is the compile error I'm getting: boost/graph/adjacency_list.hpp: In function ‘typename boost::property_map<boost::adjacency_list<OutEdgeListS, VertexListS, DirectedS, VertexProperty, EdgeProperty, GraphProperty, EdgeListS>, T Bundle::*>::type boost::get(T Bundle::*, boost::adjacency_list<OutEdgeListS, VertexListS, DirectedS, VertexProperty, EdgeProperty, GraphProperty, EdgeListS>&) [with OutEdgeListS = boost::vecS, VertexListS = boost::vecS, DirectedS = boost::bidirectionalS, VertexProperty = NodeProperty, EdgeProperty = EdgeProperty, GraphProperty = GraphProperty, EdgeListS = boost::listS, T = std::string, Bundle = GraphProperty]’: ex.cpp:37: instantiated from here boost/boost/graph/adjacency_list.hpp:561: error: no matching function for call to ‘boost::bundle_property_map<boost::adjacency_list<boost::vecS, boost::vecS, boost::bidirectionalS, NodeProperty, EdgeProperty, GraphProperty, boost::listS>, boost::detail::edge_desc_impl<boost::bidirectional_tag, long unsigned int>, EdgeProperty, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >::bundle_property_map(boost::adjacency_list<boost::vecS, boost::vecS, boost::bidirectionalS, NodeProperty, EdgeProperty, GraphProperty, boost::listS>*, std::string GraphProperty::*&)’ boost/boost/graph/properties.hpp:397: note: candidates are: boost::bundle_property_map<Graph, Descriptor, Bundle, T>::bundle_property_map(Graph*, T Bundle::*) [with Graph = boost::adjacency_list<boost::vecS, boost::vecS, boost::bidirectionalS, NodeProperty, EdgeProperty, GraphProperty, boost::listS>, Descriptor = boost::detail::edge_desc_impl<boost::bidirectional_tag, long unsigned int>, Bundle = EdgeProperty, T = std::basic_string<char, std::char_traits<char>, std::allocator<char> >] boost/boost/graph/properties.hpp:396: note: boost::bundle_property_map<Graph, Descriptor, Bundle, T>::bundle_property_map() [with Graph = boost::adjacency_list<boost::vecS, boost::vecS, boost::bidirectionalS, NodeProperty, EdgeProperty, GraphProperty, boost::listS>, Descriptor = boost::detail::edge_desc_impl<boost::bidirectional_tag, long unsigned int>, Bundle = EdgeProperty, T = std::basic_string<char, std::char_traits<char>, std::allocator<char> >] boost/boost/graph/properties.hpp:390: note: boost::bundle_property_map<boost::adjacency_list<boost::vecS, boost::vecS, boost::bidirectionalS, NodeProperty, EdgeProperty, GraphProperty, boost::listS>, boost::detail::edge_desc_impl<boost::bidirectional_tag, long unsigned int>, EdgeProperty, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >::bundle_property_map(const boost::bundle_property_map<boost::adjacency_list<boost::vecS, boost::vecS, boost::bidirectionalS, NodeProperty, EdgeProperty, GraphProperty, boost::listS>, boost::detail::edge_desc_impl<boost::bidirectional_tag, long unsigned int>, EdgeProperty, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >&) Here's my compiler version: $ cc --version i686-apple-darwin11-llvm-gcc-4.2 (GCC) 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.1.00) Copyright (C) 2007 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Any ideas? Is item #2 a bug or dumbass programmer (aka me)? Regards, Arthur --- 8< Start ex.graphml 8< --- <?xml version="1.0" encoding="UTF-8"?> <graphml xmlns="http://graphml.graphdrawing.org/xmlns" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://graphml.graphdrawing.org/xmlns http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd"> <key id="key0" for="graph" attr.name="gattr" attr.type="string"/> <key id="key1" for="node" attr.name="nattr" attr.type="string"/> <key id="key2" for="edge" attr.name="eattr" attr.type="string"/> <graph id="G" edgedefault="directed"> <data key="key0">graphval</data> <node id="n0"> <data key="key1">nodeval0</data> </node> <node id="n1"> <data key="key1">nodeval1</data> </node> <edge source="n0" target="n1"> <data key="key2">edgeval</data> </edge> </graph> </graphml> --- 8< End ex.graphml 8< --- --- 8< Start ex.cpp 8< --- #include <iostream> #include <string> #include <boost/graph/adjacency_list.hpp> #include <boost/graph/graphml.hpp> #include <boost/property_map/dynamic_property_map.hpp> struct GraphProperty { std::string gattr; }; struct NodeProperty { std::string nattr; }; struct EdgeProperty { std::string eattr; }; typedef boost::adjacency_list<boost::vecS, boost::vecS, boost::bidirectionalS, NodeProperty, EdgeProperty, GraphProperty> Graph; using namespace std; using namespace boost; int main() { Graph g; dynamic_properties props; props.property("nattr", get(&NodeProperty::nattr, g)); props.property("eattr", get(&EdgeProperty::eattr, g)); props.property("gattr", get(&GraphProperty::gattr, g)); // Fails to compile try { read_graphml(cin, g, props); write_graphml(cout, g, props); } catch (parse_error e) { cerr << e.what() << endl; } catch (bad_parallel_edge e) { cerr << e.what() << endl; } catch (directed_graph_error e) { cerr << e.what() << endl; } catch (property_not_found e) { cerr << e.what() << endl; } catch (...) { cerr << "Caught unhandled excption" << endl; } return EXIT_SUCCESS; } --- 8< Start ex.cpp 8< --- Patch to enable graph properties on GraphML files. Using 1.49.0. Index: libs/graph/src/graphml.cpp =================================================================== --- libs/graph/src/graphml.cpp (revision 1) +++ libs/graph/src/graphml.cpp (working copy) @@ -74,6 +74,15 @@ std::vector<const ptree*> graphs; get_graphs(gml, graphs); BOOST_FOREACH(const ptree* gr, graphs) { + // Search for graph attributes + BOOST_FOREACH(const ptree::value_type& attr, *gr) { + if (attr.first != "data") continue; + std::string key = attr.second.get<std::string>(path("<xmlattr>/key")); + std::string value = attr.second.get_value(""); + handle_graph_property(key, value); + } + } + BOOST_FOREACH(const ptree* gr, graphs) { // Search for nodes BOOST_FOREACH(const ptree::value_type& node, *gr) { if (node.first != "node") continue; @@ -183,6 +192,11 @@ } } + void handle_graph_property(const std::string& key_id, const std::string& value) + { + m_g.set_graph_property(m_key_name[key_id], value, m_key_type[key_id]); + } + void handle_node_property(const std::string& key_id, const std::string& descriptor, const std::string& value) { m_g.set_vertex_property(m_key_name[key_id], m_vertex[descriptor], value, m_key_type[key_id]);

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[lambda] Can't get simple lambda working...
by Robert Dailey 21 Mar '12

21 Mar '12

Here is a basic function I have: bool MimeDocument::GetExistingAttachment( std::string const& filename, std::vector<MessageAttachment> const& attachments, MessageAttachment& attachment ) { using namespace boost::lambda; using boost::lambda::_1; std::vector<MessageAttachment>::const_iterator it = std::find_if( attachments.begin(), attachments.end(), bind( &MessageAttachment::name, _1 ) == filename ); if( it != attachments.end() ) { attachment = *it; return true; } return false; } MessageAttachment::name() has 2 overloads, one that takes 1 parameter and the other that takes no parameter. I'm attempting to call the version that accepts no parameters and returns a "char const*". I want to then compare this value to the local variable "filename". This should happen for each object in the vector (_1). I get various types of compiler errors on MSVC9. They all have to do with C2780: 1>c:\code\work\cmake-mds\server\gmmserver\domino\server\interface\dimime.cpp(287) : error C2780: 'const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<10,boost::lambda::function_action<10,T>>,detail::bind_tuple_mapper<const Arg1,const Arg2,const Arg3,const Arg4,const Arg5,const Arg6,const Arg7,const Arg8,const Arg9,const Arg10>::type>> boost::lambda::bind(const Arg1 &,const Arg2 &,const Arg3 &,const Arg4 &,const Arg5 &,const Arg6 &,const Arg7 &,const Arg8 &,const Arg9 &,const Arg10 &)' : expects 10 arguments - 2 provided 1> c:\code\work\cmake-mds\build-vc9\third_party\boost\1.48.0\include\boost\lambda\detail\bind_functions.hpp(1743) : see declaration of 'boost::lambda::bind' Anyone have any idea what I'm doing wrong? --------- Robert Dailey

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Re: [boost] [git] Mercurial?
by Steve Ramsey 21 Mar '12

21 Mar '12

On Mar 20, 2012, at 8:40 PM, Edward Diener <eldiener(a)tropicsoft.com> wrote: > I have never heard a single technical argument, in all the endless > mentions of Git among the people riding that bandwagon, why Git is > better than SVN, or even why any DVCS is better than a centralized SCCS. > I consider this whole move to Git and/or DVCS among "hip" programmers > little more than a move to conform with what others are doing and feel > "cool". > > I am perfectly willing to read well-chosen technical arguments but not > from people already sold on one side or the other. But I really despair > of anyone being able to present such arguments in the atmosphere created > by Git fanatics and DVCS fanatics. The only thing I have gotten from all > this is "I've tried it, I like it, and therefore its superior". > > Feel free, anyone, to point me to a purely technical discussion, > article, whatnot, explaining the practical reasons why using a DVCS, or > Git, is more productive and more pleasurable than using a centralized > SCCS like Subversion. For what it’s worth, here is a series of articles that sold me on DVCS (and Mercurial in particular, though that’s neither here nor there) after spending quite some time wondering whether to bother: <http://hginit.com/> It’s a typically breezy Joel Spolsky piece, but it does cover use cases nicely. Steve

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[CRC][VC++] Can someone debug this?
by Daryle Walker 20 Mar '12

20 Mar '12

Are we still preparing for a release? If not (or afterwards), could someone check why the trunk's version of Boost.CRC, with more Boost.MPL usage, is choking on all versions of Visual C++. Only the latest version gives a specific error; previous versions just dump out. Daryle W.

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BOOST_PP_ITERATE for huge mpl and fusion
by Hite, Christopher 20 Mar '12

20 Mar '12

"Not to 50!!!" - Princess Bride Things like mpl::vector and fusion::map have a configured limit like BOOST_MPL_LIMIT_VECTOR_SIZE. The documentation is dodgy and doesn't mention that while it is configurable you can't really configure it to be more than 50. Many people have stumbled here: http://boost.2283326.n4.nabble.com/msm-Boost-MPL-vector-limit-size-exceeded… http://lists.boost.org/Archives/boost/2004/08/70900.php http://comments.gmane.org/gmane.comp.lib.boost.user/55679 http://lists.boost.org/Archives/boost/2010/09/170443.php Appearantly there are some scripts to generate these headers, but they may not work anymore. I had to rush hack things in my code to make several containers go over 50 in one compilation scope. #define ULTIMATE_N 70 #include <boost/mpl/vector/vector50.hpp> namespace boost { namespace mpl { # define BOOST_PP_ITERATION_PARAMS_1 \ (3,(51, ULTIMATE_N, <boost/mpl/vector/aux_/numbered.hpp>)) # include BOOST_PP_ITERATE() }} I'd really like to fix this in boost. AFAICT all I have to do is find all *50.hpp files and replace the 50 with the appropriate config limit. I count 74 instances of this stuff going on! Mostly it's phoenix, mpl, and fusion. So to wrap it up my questions are: 1) Do the scripts still work? Does anyone use them? Are they regularly tested? 2) Does anyone see a problem with my simple fix? Chris

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Possible bug in libs/context/src/asm/fcontext_ppc64_sysv_elf_gas.S
by Jeremiah Willcock 20 Mar '12

20 Mar '12

This code refers to registers r40 and r41 in several places; I think those should be r30 and r31. There are also many typos in the comments in that source file. -- Jeremiah Willcock

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[mpl] +[fusion] + [phoenix] undocumented hard-coded limit=50
by Hite, Christopher 20 Mar '12

20 Mar '12

This is a re-post of " [boost] BOOST_PP_ITERATE for huge mpl and fusion". I think problem may be that I didn't target a particular library because it happens in three. There is an undocumented hard-coded limit of 50 in MPL, Fusion, and Phoenix. I count two impls 1) has 20 elements all generated boost_1_49_0/boost/mpl/aux_/preprocessed/gcc/vector.hpp 2) stops at 50 boost_1_49_0/boost/mpl/vector/vector50.hpp I don't know if there's a way to generate more. Probably you need python. If that's the case, IMHO this should be documented so users can do it. This doesn't work: #define BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS #define BOOST_MPL_LIMIT_VECTOR_SIZE 60 #include <boost/mpl/vector.hpp> boost_1_49_0/boost/mpl/vector.hpp:36:73: fatal error: boost/mpl/vector/vector60.hpp: No such file or directory Can someone please help. I've upgraded my copy of boost. I've tried figuring out how these headers work. I'm pretty sure I could fix it if I really had to by replacing the 50 in the last file with the *_SIZE. I have this ugly hack in my code to keep things working. Would someone please help?!? Acknowledging the problem would be a start. Chris

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