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

Boost Fusion suggestion
by Pavel Bažant 28 Mar '12

28 Mar '12

I am not actually a Boost developer, but have the following suggestion regarding boost.fusion: I find the macro BOOST_FUSION_DEFINE_STRUCT potentially very useful, but it does not provide means to influence the initialization list of the default constructor. Alternatively, means to emulate c++11 default initialization (the struct Foo {int x=10;} syntax) could be emulated. Such feature would be very useful, as it would minimize repetition and make it easier to ensure that uninitialized variables are nowhere used. I already generate my structs from BOOST_PP sequences in a similar way to BOOST_FUSION_DEFINE_STRUCT to avoid having to write json serialization boilerplate, but a variant of BOOST_FUSION_DEFINE_STRUCT i am suggesting would make this task even simpler. Pavel Bazant

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[functional] [overloaded_function] polymorphic functions?
by Lorenzo Caminiti 27 Mar '12

27 Mar '12

Hello all, I spent some time trying to make overloaded_function support polymorphic functions but I had little success :( 1) I was able to do this (see code below): overloaded_function< void (int) , functor<poly, void (generic)> > o(f, p); o(321); o(3.21); o("cba"); But I don't like it because I explicitly have to pass the functor type poly. I wanted instead to only use generic to tag the template parameters in the signature: overloaded_function< void (int) , void (generic) > o(f, p); o(321); o(3.21); o("cba"); I'd consider this acceptable but I wasn't able to program this because I loose p's type (poly) in base so base cannot hold a reference to the functor p... Is there a way around this? (Some type-erasure magic maybe??) 2) I don't think this can work with function templates because in order to get a pointer to a function template you have to instantiate it: g<char*> Now I can get the function pointer but it's not polymorphic anymore... 3) I don't think there is any way to implement make_overloaded_function with polymorphic types because I can't re-construct the function signature from the functor given that its operator contains template parameters... I have no idea on how to work around this... If you have suggestions for 1, 2, or 3), they are welcome. Otherwise, it seems that supporting polymorphic functions in overloaded_function is not really feasible... The little I got so far: #include <boost/function.hpp> #include <boost/type_traits/function_traits.hpp> #include <iostream> void f(int x) { std::cout << x << std::endl; } template<typename T> void g(T x) { std::cout << x << std::endl; } struct poly { template<typename T> void operator()(T x) { std::cout << x << std::endl; } }; template<typename F> struct base { template<typename G> base(G g) : f_(g) {} typename boost::function_traits<F>::result_type operator()( typename boost::function_traits<F>::arg1_type arg1 ) { return f_(arg1); } private: boost::function<F> f_; }; struct generic; template<typename Ftor, typename F> struct functor; template<typename Ftor, typename R> struct base< functor<Ftor, R (generic)> > { base(Ftor& ftor) : ftor_(ftor) {} template<typename Arg1> R operator()(Arg1 arg1) { return ftor_(arg1); } private: Ftor& ftor_; }; template<typename F1, typename F2> struct overloaded_function : base<F1>, base<F2> { template<typename G1, typename G2> overloaded_function(G1 g1, G2 g2) : base<F1>(g1), base<F2>(g2) {} using base<F1>::operator(); using base<F2>::operator(); }; int main() { f(123); g("xyz"); boost::function<void (char*)> gg = g<char*>; poly p; p(1.23); p("abc"); overloaded_function< void (int) , functor<poly, void (generic)> > o(f, p); o(321); o(3.21); o("cba"); return 0; } Thanks a lot. --Lorenzo

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[git] What's the IDE picture like?
by Rene Rivera 27 Mar '12

27 Mar '12

All this talk about switching to git brings up one important question for me, and I suspect others.. Given all the various git-flow, git-this, git-that, git-whatever, tools that are getting mentioned.. What is the process for a user that wants to do their development, including version control, like? Specifically what does an: * Eclipse user do? * Xcode user do? * VIsualStudio user do? I ask because I'm really tired of learning yet more command lines tools at this stage in my life. And even though all GUI tools have drawbacks they do have the advantage that they condense the workflow usages to something understandable. And I would be really hard pressed to use any new version control system that I can't use a GUI. And preferably an integrated GUI. -- -- -- Grafik - Don't Assume Anything -- Redshift Software, Inc. - http://redshift-software.com -- rrivera/acm.org - grafik/redshift-software.com -- 102708583/icq - grafikrobot/aim - grafikrobot/yahoo

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[move] explicit moving from a rvalue
by Vicente J. Botet Escriba 27 Mar '12

27 Mar '12

Hi Ion, With the current emulation of move semantics of Boost.Thread using Boost.move, I have a case that I would like to make working in a portable way boost::thread t = boost::thread( MoveOnly()); The library declares the template move constructor from a movable callable as as follows template <class F> explicit thread(boost::rv<F>& f); and MoveOnly is declared as defined below. The problem is a know limitation as the compiler is unable to deduce F as been MoveOnly even if MoveOnly is convertible to boost::rv<MoveOnly>& Jeffrey Lee Hellrung, Jr. made a proposal to try to solve the issue, but his proposal has a performance penality. Here it is a less elegant but efficient enough alternative. The addition of a explicit move conversion as ::boost::rv<MoveOnly>& move() { return *static_cast< ::boost::rv<MoveOnly>* >(this); } allows to the following to work as expected boost::thread t = boost::thread( MoveOnly().move()); While this workaround works when we are using the emulation it doesn't works when rvalue references are supported. I have defined a macro BOOST_EXPLICIT_MOVE that allows to write portable code #if ! defined BOOST_NO_RVALUE_REFERENCES #define BOOST_MOVE(RVALUE) RVALUE #else #define BOOST_MOVE(RVALUE) RVALUE.move() #endif that can be used as boost::thread t = boost::thread( BOOST_MOVE(MoveOnly())); The move() function is not really needed as the macro can hide the needed conversion, but could be preferred by users that don't need to make portable programs. The evident liability is of course the use of the macro. Is there something wrong on this design, something to to improve? The same design can be used on compilers, such as as SunStudio (see https://svn.boost.org/trac/boost/ticket/6222) that prefer the overload of a private copy constructor to an public move constructor. On these kind of compilers the following overload private: MoveOnly(MoveOnly&); public MoveOnly(boost::rv<MoveOnly>&) makes the following to fail at compile time MoveOnly MakeMoveOnly() { return MoveOnly(); } but MoveOnly( MakeMoveOnly(() { return BOOST_MOVE(MoveOnly()); } will work. Do you think that member functions as the explicit move() and a macro as BOOST_MOVE can be added to Boost.Move emulation? Best, Vicente ///////////////////////////// class MoveOnly { #ifndef BOOST_NO_DELETED_FUNCTIONS public: MoveOnly(const MoveOnly&)=delete; MoveOnly& operator=(MoveOnly const&); #else private: MoveOnly(MoveOnly&); MoveOnly& operator=(MoveOnly&); public: #endif MoveOnly() { } #ifndef BOOST_NO_RVALUE_REFERENCES MoveOnly(MoveOnly&&) {} #else #if defined BOOST_THREAD_USES_MOVE MoveOnly(boost::rv<MoveOnly>&) {} MoveOnly& operator=(boost::rv<MoveOnly>&) { return *this; } operator ::boost::rv<MoveOnly>&() { return *static_cast< ::boost::rv<MoveOnly>* >(this); } operator const ::boost::rv<MoveOnly>&() const { return *static_cast<const ::boost::rv<MoveOnly>* >(this); } ::boost::rv<MoveOnly>& move() { return *static_cast< ::boost::rv<MoveOnly>* >(this); } const ::boost::rv<MoveOnly>& move() const { return *static_cast<const ::boost::rv<MoveOnly>* >(this); } #else #error #endif #endif void operator()() { } };

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[quickbook] Controling the layout of table columns in docbook/fo output
by Andreas Pokorny 27 Mar '12

27 Mar '12

Hi, In an earlier thread I mentioned that I am using quickbook to write software design specification/documentation. The whole document grows nicely now. Since more people are contributing, I added howto chapters to the end of the document, including some kind of guided quickbook skeleton for new chapters and the quickbook documentation itself. The quickbook documentation creates warnings with fop: Mar 12, 2012 8:11:46 PM org.apache.fop.events.LoggingEventListener processEvent WARNING: table-layout="fixed" and column-width unspecified => falling back to proportional-column-width(1) (See position 1686:869) Mar 12, 2012 8:11:46 PM org.apache.fop.events.LoggingEventListener processEvent WARNING: table-layout="fixed" and column-width unspecified => falling back to proportional-column-width(1) (See position 1686:905) Mar 12, 2012 8:11:46 PM org.apache.fop.events.LoggingEventListener processEvent WARNING: table-layout="fixed" and column-width unspecified => falling back to proportional-column-width(1) (See position 1896:796) and more. That happens for every table. Inside the documentation about tables there one containing hello world source. There the proportional column width makes the source code leave the table and text area of the page. Is there a yet undocumented way to control column sizes? regards Andreas

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Re: [boost] [utility] Adding noexcept to boost::declval
by Michel Morin 27 Mar '12

27 Mar '12

Vicente J. Botet Escriba wrote >> Summary: >> Defining declval<T>() as add_lvalue_reference<T>::type is wrong; >> add_lvalue_reference should be removed! >> >> > There is something that disturb me by returning just T, doesn't this forces > the type T to CopyConstructible? Nope. T needs not to be CopyConstructible (Note that declval can be used only in unevaluated contexts.) > The idea to use T& instead was to avoid > this. You shouldn't do this, because this transforms rvalues to lvalues. > I have rolled back at revision 77562. Thanks, Vicente! Minor issue: `#include <boost/type_traits/add_lvalue_reference.hpp>` is not removed yet. Regards, Michel

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[filesystem] Heads up; filesystem in trunk unstable while V2 removed
by Beman Dawes 26 Mar '12

26 Mar '12

To ensure that history is preserved, the removal of version 2 will be done as three commits. Filesystem in trunk will be unstable during until all three commits are completed. Hopefully this will take less than an hour. I'll post a notice when complete. --Beman

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[gsoc]
by Andrew Sutton 26 Mar '12

26 Mar '12

It looks like there will be no summer of Code for Boost this year. For whatever reason, Google has decided not to accept Boost as a mentoring organization. Andrew

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Re: [boost] [utility] Adding noexcept to boost::declval
by Michel Morin 26 Mar '12

26 Mar '12

(Forgot to send to the list; now back to the list again.) Vicente J. Botet Escriba wrote: > OK, I will rollback it and analyze the breaking change. The important thing is that declval<T>() should preserve the constness/non-constness and the rvalueness/lvalueness of T. Essentially, it's OK to define declval<T>() as simply T. Then, why declval<T>() is defined as add_rvalue_reference<T>::type? This is because * When declval<T>() is defined as T, we cannot use abstract types as T. * When declval<T>() is defined as T&&, we cannot use void as T. The definition with add_rvalue_reference<T>::type also allows to use incomplete types as T. In C++03, it is not possible to construct rvalues of abstract types or incomplete types. So, the correct way to define declval<T>() in C++03 is to just use T. And this is the definition of declval<T>() in the previous version of boost::declval when BOOST_NO_RVALUE_REFERENCES is defined. Summary: Defining declval<T>() as add_lvalue_reference<T>::type is wrong; add_lvalue_reference should be removed! Regards, Michel

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Re: [boost] [gsoc]
by Andrzej Krzemienski 26 Mar '12

26 Mar '12

> From an outside point of view, i do agree. I don't see a lot of Boost GSOC > projects completed. And that's really disapointing. > In my fileds of interests, i would love to see some libraries integrated > that deals with : > - large integer / large fixed point computation > - json parser/ writer > - xml parser/ writer like pugiwml > - crossplatform async file io for boost asio (not only for windows) > - xmpp/sip stack Boost does provide parsers and writers for JSON and XML files. See http://www.boost.org/doc/libs/1_49_0/doc/html/property_tree.html. Regards, &rzej

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how to mark a test "fail*"
by lcaminiti 25 Mar '12

25 Mar '12

Hello all, Expected regression test failures are marked with "fail*" and give an explanation for why the failure is expected: http://www.boost.org/development/tests/trunk/developer/output/Sandia-intel-… How do I add an explanation for a new expected failure? Is there some documentation on this process? For example, emulation_this and emulation_this_tpl are expected to fail on MSVC8 and the user should use native type-of for those-- how do I add a link with such explanation the regression test table? http://www.boost.org/development/tests/trunk/developer/output/VC8%20jc-bell… http://www.boost.org/development/tests/trunk/developer/output/VC8%20jc-bell… Thanks a lot! --Lorenzo -- View this message in context: http://boost.2283326.n4.nabble.com/boost-how-to-mark-a-test-fail-tp4503985p… Sent from the Boost - Dev mailing list archive at Nabble.com.

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[mpi] all_reduce and MPI_IN_PLACE like feature
by Alain O Miniussi 25 Mar '12

25 Mar '12

Hi, MPI_Allreduce offers the possibility to use the same buffer for the send and recv data: http://www.open-mpi.org/doc/v1.4/man3/MPI_Allreduce.3.php#toc8 It seems that boost's all_reduce does not allow such a feature. First, I would like to know if the previous statement is correct and, if yes, if it was just overlooked or if there was a reason for that? Just in case, I filed a ticket regarding that issue, along with a tentative patch, in https://svn.boost.org/trac/boost/ticket/6704 Regards, Alain

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Using C++11 lambdas to replace Phoenix in MPL expressions
by Augustus Saunders 25 Mar '12

25 Mar '12

I use Phoenix to essentially turn code into types which can then be manipulated through MPL. I mostly use this to conditionally select algorithms or to include/exclude code at compile time, based on some logic written with MPL. I was interested in writing the code fragments using the new C++11 lambda expressions as it gives a more natural way to write code. While you can get the type of a lambda expression with decltype, the problem I've run into is instantiating the resultant type in order to actually get the function to execute. Lambdas have no default constructor, which makes sense, as there would be no way to deal with the capture variables. So I'm wondering if anybody can shed some light on manually instantiating lambdas. I would think there is a way (possibly shady) to do this, at least for lambdas with no capture. Then passing around lambda types as template parameters would be useful, which I think would lead to many interesting results. I only get the digest, so it I would appreciate it if you CC me on any response. Thanks- Augustus

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[lexical_cast][random] ADL problem with gcc c++11
by Joel de Guzman 25 Mar '12

25 Mar '12

Hi, I can't get this to compile on gcc-4.6.1 with -std=c++0x flag: #include <boost/random.hpp> int main() { return 0; } I'm getting an error in lexical_cast: C:\dev\boost/boost/lexical_cast.hpp:1323:120: error: there are no arguments to 'swprintf' that depend on a template parameter, so a declaration of 'swprintf' must be available [-fpermissive] Obviously, I can compile with -fpermissive, but I'd like to report this anyway. Regards, -- Joel de Guzman http://www.boostpro.com http://boost-spirit.com

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Re: [boost] [git] Mercurial?
by David Greene 25 Mar '12

25 Mar '12

Edward Diener <eldiener(a)tropicsoft.com> writes: >> Also back to the point - DVCS are written to provide best possible >> support for merging. This makes 1) or 2) you propose above very >> efficient. In SVN or other centralized systems it is not so, just look >> up the bit I left from Joel's message above. > > I do not believe for even a second that any product can do merging of > the same source file automatically and flawlessly. This strawman keeps resurfacing. No one has claimed than any VCS can avoid manual merging at times. A centralized VCS needs to operate as you outlined: >> Bu how is this different from: >> >> 1) Creating a local SVN repository and importing some branches from >> another SVN repository. >> >> and/or >> >> 2) Having one's own branch of an SVN repository as one's own. #1 is a horribly manual operation. I don't know if you quite grasp how complicated it is. I've been doing it for years. Getting the history preserved correctly is not trivial. #2 has almost no support in SVN. Now that SVN has merge tracking it is marginally better but there are problems with this model. Foremost, the branch has to be in a centralized repository and everyone owkring on the project has to deal with it in some fashion. It's not private in any sense of the word. You can't work on it if you don't have 'net access. You can't back out changes that you realized later were bad and ensure no one else ever sees those changes. The difference with a DVCS is both #1 and #2 are natively supported in the tool. There is no difference between a private local branch, a remote branch in a _de_facto_ central repository and a remote branch in some other random repository. They all look and act the same. I admit it is a tough concept to grasp for someone not used to it. It took me some time to grok it. But now it is second-nature to me and there's no way I'm going back. -Dave

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[config] Why does BOOST_NO_STD_LOCALE imply BOOST_NO_STD_WSTREAMBUF?
by Yechezkel Mett 25 Mar '12

25 Mar '12

I have found the following in config/suffix.hpp: // // We can't have a working std::wstreambuf if there is no std::locale: // # if defined(BOOST_NO_STD_LOCALE) && !defined(BOOST_NO_STD_WSTREAMBUF) # define BOOST_NO_STD_WSTREAMBUF # endif What is the reasoning behind this? My problem is that I am using Windows CE 6.0 with the supplied standard library, and it has no <locale>, yet still seems to provide a working wstreambuf. The effect is that I can't get boost::wformat, which is annoying, considering that the WinCE API uses only wide characters. I have checked that removing this line works. Is there any way to undefine BOOST_NO_STD_WSTREAMBUF without modifying the source? Yechezkel Mett

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Re: [boost] [Boost-commit] svn:boost r77506 - in trunk: boost/property_map libs/property_map/doc libs/property_map/test
by Michel Morin 25 Mar '12

25 Mar '12

> Author: jewillco > Date: 2012-03-23 15:35:52 EDT (Fri, 23 Mar 2012) > New Revision: 77506 > URL: http://svn.boost.org/trac/boost/changeset/77506 […] > --- (empty file) > +++ trunk/boost/property_map/function_property_map.hpp 2012-03-23 […] > +#ifndef BOOST_PROPERTY_MAP_FUNCTION_PROPERTY_MAP_H > +#define BOOST_PROPERTY_MAP_FUNCTION_PROPERTY_MAP_H […] > +#endif /* BOOST_PROPERTY_MAP_FUNCTION_PROPERTY_MAP_H */ s/H/HPP > +template<typename Func, typename Key, typename Ret = typename boost::result_of<Func(Key)>::type> > +class function_property_map: public put_get_helper<Ret, function_property_map<Func, Key, Ret> > { […] > + typedef Ret reference; […] > + reference operator[](const Key& k) const { > + return f(k); > + } > + > + reference operator[](const Key& k) { > + return f(k); > + } […] > + private: > + Func f; > +}; In const version of the subscript operator, `f` is treated as `const Func`. So `reference` might not be appropriate for its return type. You can avoid this issue by making `f` mutable. Or, how about defining the default template argument of `Ret` as `boost::result_of<const Func(Key)>::type` and removing non-const version of the subscript operator? (Since property maps are often passed around by values, it makes less sense to allow stateful functors in `function_property_map`, IMHO.) Regards, Michel

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Re: [boost] Please advise: Boost with LLVM Clang and 0x11 dialect ?
by Steve Ramsey 24 Mar '12

24 Mar '12

On Mar 21, 2012, at 1:35 AM, "John M. Dlugosz" <mpbecey7gu(a)snkmail.com> wrote: > 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. It's not an automatic process, but once the initial effort is spent, it works beautifully. I should point out that I use both C++11 and libc++, and I ended up making a number of changes to boost build files to get various features working. The biggest problem is the lack of support in tools/build/v2/tools/clang-darwin.jam for specifying the SDK/platform for cross-compiling. My solution since boost 1.47 has been to replace it with a modified copy of tools/build/v2/tools/darwin.jam; if I thought this was going to be an issue for anywhere near as long as it has, I would've sent in a patch half a year ago (aside: do any of the maintainers actually use boost on OS X?). An additional complication is that as of Xcode 4.3, variant toolchains are stored in a different location and use a slightly different directory structure; a nice solution would be to support a build feature to indicate this and respond accordingly; I just hardcode for Xcode 4.3+. I'm happy to send you diffs off-list if you're interested, but it's frankenhacks all the way down until I get around to making a clean patch file for clang-darwin.jam. Steve P.S. The only source/header file with a problem is libs/signals/src/named_slot_map.cpp, which is trivially fixable.

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[filesystem] [svn] How to remove V2 files without loss of V3 history?
by Beman Dawes 24 Mar '12

24 Mar '12

The boost/filesystem directory currently looks like this: v2 config.hpp // actual header convenience.hpp exception.hpp fstream.hpp operations.hpp path.hpp v3 config.hpp // actual header convenience.hpp exception.hpp fstream.hpp operations.hpp path.hpp config.hpp // forwards to v2/config.hpp or v3/config.hpp convenience.hpp exception.hpp fstream.hpp operations.hpp path.hpp It is time to remove the dual version support. What I'd like to do is: * create a branch, * switch to it, * delete the top level forwarding headers, * move the v3 headers up to boost/filesystem, * delete the v2 and v3 directories, * modify the headers as needed, * merge back to trunk. At the completion of the merge, the history for the boost/filesystem headers should include the full history of what were the boost/filesystem/v3 headers. What are the svn commands to accomplish that? Thanks, --Beman

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[utility] Adding noexcept to boost::declval
by Michel Morin 24 Mar '12

24 Mar '12

Now that we have BOOST_NOEXCEPT macro, it is reasonable to add noexcept to boost::declval (by means of BOOST_NOEXCEPT). As a note, std::declval is marked as noexcept. I made a ticket with a patch here: https://svn.boost.org/trac/boost/ticket/6570 If it looks sensible, could someone apply the patch? Regards, Michel

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interprocess with unordered_map
by Joel Young 23 Mar '12

23 Mar '12

>> Folks, I've built a unordered_map in a memory mapped file. The map goes from: typedef boost::interprocess::allocator< char, boost::interprocess::managed_mapped_file::segment_manager > char_allocator_t; typedef boost::interprocess::basic_string< char, std::char_traits<char>, char_allocator_t > typedef std::pair< key_type, pay_type> val_type; typedef boost::interprocess::allocator< val_type, boost::interprocess::managed_mapped_file::segment_manager> allocator_t; typedef boost::unordered_map< key_type, pay_type, boost::hash<key_type>, std::equal_to<key_type>, allocator_t> map_type; Everything works fine on creation. But when I later go to read from the map in a different program where the mapped file is opened read only, I have to do gymcrackery like: // A temporary string that allocates from the mapped file struct shm_clean { // cleanup shared memory on stack-unwind shm_clean() { boost::interprocess::shared_memory_object::remove("StupidSharedMemory"); } ~shm_clean() { boost::interprocess::shared_memory_object::remove("StupidSharedMemory"); } } cleaner; boost::interprocess::managed_shared_memory stupid(boost::interprocess::create_only ,"StupidSharedMemory" ,500); key_type key_val(stupid.get_segment_manager()); to create a temporary to allow me to search since the maps find() method will only take a key_type and interprocess::basic_string WILL NOT implicitly construct from a std::string, nor will it implicitly construct from a char* to itself. Can the interprocess::basic_string be modified to allow these conversions? I hate having to do: key_val = "fruitcake"; db.find(key_val); Suggestions? Thanks! Joel

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[config] PGI config file doesn't defines BOOST_HAS_THREADS
by Vicente J. Botet Escriba 23 Mar '12

23 Mar '12

There is an issue on Boost.Thread regression test for PGI compiler. See https://svn.boost.org/trac/boost/ticket/6354. "pgCC" -INLINE:none -Kieee -fpic -fPIC -gopt -Minform=warn -DBOOST_ALL_NO_LIB=1 -DBOOST_TEST_NO_AUTO_LINK=1 -DBOOST_THREAD_POSIX -DBOOST_THREAD_USE_DLL=1 -D__need_IOV_MAX -I".." -c -o "/scratch/kbelco/boost/results/boost/bin.v2/libs/thread/test/test_barrier.test/pgi-11.9/debug/threading-multi/test_barrier.o" "../libs/thread/test/test_barrier.cpp" "../boost/config/requires_threads.hpp", line 86: catastrophic error: #error directive: "Compiler threading support is not turned on. Please consult your compiler's documentation for the appropriate options to use" # error "Compiler threading support is not turned on. Please consult your compiler's documentation for the appropriate options to use" boost/config/compiler/pgi.hpp defines BOOST_HAS_PTHREADS but not BOOST_HAS_THREADS, resulting in failure in the requires_threads.hpp header. It seems that adding #define BOOST_HAS_THREADS inboost/config/compiler/pgi.hpp solves the issue. John, what do you think? Could I add it? Best, Vicente

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Re: [boost] DCVS vs CVS: call for constructivism
by Gottlob Frege 23 Mar '12

23 Mar '12

I have a question for the git (or hg) people. Maybe the concrete situation will shed some light on some of the issues (or maybe I'll just get some help and stop pulling what's left of my hair out). I'm working on code.cpp and morecode.cpp. At the same time, I am writing scripts like review.sh (makes git work better with code collaborator) and, say, custom_make.bat. I am going back and forth on these as needed. In particular, as the cpp files get in shape I commit, and maybe post something for review. We leads me to change review.sh. Or as I get things working, I modify custom_build.bat. To me, once done, these are separate commits/branches/features/changelists (whatever you want to call them). But while working on them, I don't want to flip between branches - I find I'm always changing something in the wrong branch when I try separate branches. ie I change code.cpp while in the "scripts" branch. And it is often more than 2 things I am working on. And sometimes (not usually) they are at least somewhat related - ie code.cpp depends on yourstuff.h, and I need to make a small fix in yourstuff.h. In the end, that fix will be separate, but until i know it is correct, it tends to stay mixed with my other work. Now maybe the dependency case is different, I don't know. (obviously at the end of the day, the order of dependent changes needs to be pushed correctly). So basically, in something like perforce, I can group the files into changelists, and then forget about it until something is completely done and ready to commit. I understand I'm losing other features (small commits, being able to easily set it all aside, etc), but this is my common workflow. Should I do everything on a messy "work" branch and just sort it out when I am ready to push? Should I keep the features in separate branches, but pull from branch to branch all the time? (I don't think I want to spend that much time with the RCS. I like forgetting about it most of the time.) Am I just doing it wrong? (And did any of this make any sense?) Tony Sent from my portable Analytical Engine

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[typeof] MSVC errors on PGI?
by lcaminiti 23 Mar '12

23 Mar '12

Hello all, I'm getting compiler errors when using Boost.Typeof on PGI (plus these errors seems to be from Boost.Typeof for MSVC?). It's the first time I try to use PGI... what am I doing wrong? // File: 01.cpp #include <boost/typeof/typeof.hpp> int main() { int x = 0; BOOST_TYPEOF(x) y = x; return y; } $ pgcpp -I ../../.. 01.cpp "../../../boost/typeof/msvc/typeof_impl.hpp", line 150: error: class "boost::type_of::msvc_extract_type<ID>::id2type [with ID=ID]" cannot be defined in the current scope struct base_type::id2type // This uses nice VC6.5 and VC7.1 bugfeature ^ "../../../boost/typeof/msvc/typeof_impl.hpp", line 160: error: incomplete type is not allowed typedef typename id2type::type type; ^ detected during instantiation of class "boost::type_of::msvc_typeid_wrapper<ID> [with ID=5]" at line 6 of "01.cpp" 2 errors detected in the compilation of "01.cpp". BTW, I'm trying to use PGI to get ScopeExit regression tests to all pass on this compiler. PGI users-- any help is welcome! --Lorenzo -- View this message in context: http://boost.2283326.n4.nabble.com/boost-typeof-MSVC-errors-on-PGI-tp449921… Sent from the Boost - Dev mailing list archive at Nabble.com.

1 0

René Eng möchte chatten
by René Eng 23 Mar '12

23 Mar '12

----------------------------------------------------------------------- René Eng möchte einige der neuen Google-Produkte verwenden, um mit Ihnen besser in Kontakt zu bleiben. Wenn Sie schon Google Mail oder Google Talk verwenden, besuchen Sie: http://mail.google.com/mail/b-4122791ae-68c38cb068-RejaciDzcqGQypwAD-y35NwA… Klicken Sie auf diesen Link, um mit René Eng chatten zu können. Um Google Mail - ein kostenloses E-Mail-Konto von Google mit mehr als 2800 Megabyte Speicherplatz - zu erhalten und mit René Eng zu chatten, besuchen Sie: http://mail.google.com/mail/a-4122791ae-68c38cb068-RejaciDzcqGQypwAD-y35NwA… Google Mail bietet: - Instant Messaging direkt in Google Mail - Leistungsstarken Spamschutz - Integrierte Suche nach E-Mails und praktische Möglichkeiten, E-Mails in "Konversationen" zu ordnen - Keine Pop-up-Anzeigen oder nicht zielgerichtete Banner - nur Textanzeigen und Informationen, die für den Inhalt Ihrer E-Mails relevant sind Alle diese Funktionen erhalten Sie kostenlos. Aber das ist noch nicht alles! Wenn Sie sich für ein Google Mail-Konto registrieren, erhalten Sie auch Zugriff auf Google Talk, den Instant Messaging-Dienst von: http://www.google.com/talk/intl/de/ Google Talk bietet: - Einen webbasierten Chat, den Sie überall verwenden können, ohne dass ein Download erforderlich ist - Eine mit Ihrem Google Mail-Konto synchronisierte Kontaktliste - Kostenlose, qualitativ hochwertige Sprachanrufe von Computer zu Computer, wenn Sie den Google Talk-Client herunterladen Von Zeit zu Zeit fügen wir immer wieder neue Funktionen zu Google Talk hinzu und nehmen weitere Verbesserungen vor, weshalb wir Sie möglicherweise regelmäßig um Kommentare und Vorschläge bitten. Wir danken Ihnen für Ihre Hilfe bei der Optimierung unserer Produkte! Vielen Dank! Ihr Google Team Weitere Informationen zu Google Mail und Google Talk erhalten Sie unter: http://mail.google.com/mail/help/intl/de/about.html http://www.google.com/talk/intl/de/about.html Wenn das Klicken auf die URLs in dieser E-Mail nicht funktioniert, kopieren Sie sie und fügen Sie sie in die Adressleiste Ihres Browsers ein.

1 0

Looking for some "real world" extended precision integer arithmetic tests
by John Maddock 23 Mar '12

23 Mar '12

Folks, I'm continuing to add to the multiprecision arithmetic library in the sandbox (under "big_number"), and I've just added a Boost licensed fixed-precision integer type which on Win32 at least looks to be very competitive with GMP for reasonable numbers of bits (up to about 1024), see http://svn.boost.org/svn/boost/sandbox/big_number/libs/multiprecision/doc/h… However, as we all know there are lies damn lies and performance stats ;-) Plus the test results I have above ignore the effect of memory allocations (needed by libtommath and GMP, but not the fixed_int code - which in theory should make it faster still). So I'd be really interested to put the type through it's paces with some real world code that really thrashes an extended precision integer type. Any suggestions? Anything in Boost? Thanks in advance, John.

5 38

[Context] Compile Broken for MSVC under x64 (r77477 Trunk)
by Joshua Boyce 23 Mar '12

23 Mar '12

r77477 has broken compilation of Boost.Context on trunk for me when using MSVC and targeting x64 (it spits out a "platform not supported" error). I believe this is because MSVC does not define any of the preprocessor directives that are being checked now (instead of _WIN64). I believe the fix for this is to check _M_AMD64 and/or _M_X64. http://msdn.microsoft.com/en-us/library/b0084kay(v=vs.110).aspx _M_X64: Defined for x64 processors. _M_AMD64: Defined for x64 processors. This patch fixes the issue for me: http://dl.dropbox.com/u/74751/cpp/boost/patches/context-msvc-x64-fix-201203… Thanks.

1 0

[algorithm] aesthetic question about cxx11
by lcaminiti 22 Mar '12

22 Mar '12

Hello all, I have an aesthetic question. Boost.Algorithm puts C++11 algorithms like all_of into a directory boost/algorithm/cxx11. Would the directory name boost/algorithm/cpp11 be preferred? I think for file names .cpp and .hpp are Boost choice over .cxx and .hxx. But for directory names instead cxx11 is Boost choice over cpp11? Similarly, shall macros that refer to C++11 be named BOOST_..._CPP11_... or BOOST_..._CXX11_...? In general, shall Boost refer to C++11 as cpp11/CPP11 or cxx11/CXX11? Given that .cpp/.hpp is Boost choice for file names over .cxx/.hxx, I'd think cpp11/CPP11 would be Boost choice over cxx11/CXX11... P.S. I have a similar situation in Boost.Contract where I want to put macros to parse C++11 keywords (override, final, etc) in a separated directory and I want to name that directory cxx11 or cpp11 consistently with other Boost libraries (so users don't have to remember different conventions). Thanks. --Lorenzo -- View this message in context: http://boost.2283326.n4.nabble.com/boost-algorithm-aesthetic-question-about… Sent from the Boost - Dev mailing list archive at Nabble.com.

10 21

[config] local types as template params
by Lorenzo Caminiti 22 Mar '12

22 Mar '12

Hello all, Is it possible to add a macro BOOST_CONFIG_LOCAL_TYPES_AS_TEMPLATE_PARAMS to Boost.Config to indicate if local types can be passed as template parameters? 1) Boost.Closure (formerly, Boost.Local) implements some optimizations when local types can be passed as template parameters. 2) C++11 always allows to pass local types as template parameters. 3) Local types cannot be passed as template parameters on C++03 instead but some C++03 compilers MSVC 8 (and older?) allow it anyway. // If it is possible to pass local types (classes, etc) as template parameters. // This is not possible in pure C++03 but it is possible in some C++03 // extensions (MSVC 8.0) and with C++11 (GCC >= 4.5.x -std=c++0x). #if (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ > 4)) && \ defined(__GXX_EXPERIMENTAL_CXX0X__) // From GCC 4.5.x when -std=c++0x specified. # define BOOST_LOCAL_TYPES_AS_TEMPLATE_PARAMS #elif defined(_MSC_VER) // For (all?) MSVC (tested on MVSC 8.0). # define BOOST_LOCAL_TYPES_AS_TEMPLATE_PARAMS #endif All, can you please try to compile the following example on different compilers/versions and let me know the outcome? If this example compiles successfully then the specific compiler supports local types as template parameters: #include <algorithm> #include <iostream> int main() { struct s { void operator()(int x) { std::cout << x << std::endl; } } l; int nums[] = {1, 2, 3}; std::for_each(nums, nums + 3, l); return 0; } For example, this compiles on GCC >= 4.5.x w/ C++0x extensions enabled and on MSVC 8.0- does it compile on all MSVC versions? Thanks. --Lorenzo

8 12

[config] missing BOOST_HAS_STDINT_H for PGI
by Oliver Kowalke 22 Mar '12

22 Mar '12

ticket: 6724 boost/config/compilers/pgi.h does not define BOOST_HAS_STDINT_H -> boost/cstdint.hpp does not include stdint.h Oliver

2 1

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

1 0

[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

2 2

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

2 1

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]);

1 0

[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

6 10

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

2 1

[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.

3 3

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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[xpressive] Does '_' match newlines?
by Robert Dailey 19 Mar '12

19 Mar '12

I have the following static regex: sregex filename_re = icase("Content-Disposition:") >> -*_ >> "filename=" >> (s2=-+_) >> ';' ; I want the "*_" part to also match newline characters. I didn't see any flag to turn this on or off. Is this on by default? I see boost::xpressive::regex_constants::syntax_option_type::not_dot_newline, but not sure where you would (or wouldn't) specify this. I only recall the ability to specify flags for a regex when you compile a dynamic regex, not a static one. Help is appreciated! --------- Robert Dailey

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new Overload library version
by Marco Cecchetti 19 Mar '12

19 Mar '12

Hi everyone! I noticed that an overloaded function utility has appeared under boost/functional as a spin-off of Camiti's Boost.Local library. Indeed on 2007 I had begun implementing something similar. All started from a Joel de Guzman's post where he showed a proof of concept of a thin-wrapper of several Boost.Functions. See: http://lists.boost.org/Archives/boost/2007/09/127906.php On that code base, I designed Overload, a small library whose interface matches as much as possible Boost.Function interface. Some documentation was written down thanks to the help and support of Dean M. Berris. Due to lack of time and the small amount of use cases I stopped spending my time on such a project. Anyway lately I have been working on the Overload library again. I have performed a light re-design of the interface, added a few new features and a lot of more testing, finally I've got to improve documentation. I uploaded the new version on the sandbox. In case you are interested these are the links: - library: http://svn.boost.org/svn/boost/sandbox/overload/trunk/ - documentation: http://svn.boost.org/svn/boost/sandbox/overload/trunk/libs/overload/docs/ht… Please don't reply to me about the not so proper library name, I could change it but it is a secondary issue. Regards, -- Marco -- Using Opera's revolutionary e-mail client: http://www.opera.com/mail/

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[chrono] [thread] Test names too long
by Steven Watanabe 19 Mar '12

19 Mar '12

AMDG When I try to run the tests for Boost.Thread or Boost.Chrono I get an error like: failed to write output file '..\bin.v2\libs\chrono\test\basic_stopwatch_reporter _laps_accumulator_set_pass_shared.test\msvc-10.0express\debug\asynch-exceptions- on\threading-multi\stopwatch\basic_stopwatch_reporter_laps_accumulator_set_pass. obj.rsp'! Could the names possibly be made shorter? I can get it to build using --hash, but they're still rather long. In Christ, Steven Watanabe

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Re: [boost] size() type
by Olaf van der Spek 18 Mar '12

18 Mar '12

Hi, Any progress on these tickets? Would be nice to have a solution. size() return type should be size_type, not difference_type: https://svn.boost.org/trac/boost/ticket/5971 data() for iterator_range: https://svn.boost.org/trac/boost/ticket/5930 Greetings, -- Olaf

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[git] git-repo?
by Oliver Kowalke 18 Mar '12

18 Mar '12

I'm wondering about Beman Dawes 'Moving Boost to Git' on C++ Now! - has boost an official git-repo? Could I use it instead of svn-trunk? regards, Oliver

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[Range] Path for Bug 5993
by Julien Nitard 18 Mar '12

18 Mar '12

Hi All, Would it be possible to apply the patch I have just submitted to trac on bug 5993 ? It should be pretty harmless. https://svn.boost.org/trac/boost/ticket/5993 Many thanks, Julien

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GSoC Proposal
by Subrata Biswas 18 Mar '12

18 Mar '12

Dear Sir/Madam, I want to design a new IPC for Linux(Which can be extended for windows and mac also) as a project in Google Summer of Code. I have already started it and developed its very basic prototype. I have also written the proposal according to your format. But I could not find the email id where I can send my proposal. I have used your irc but hardly anyone were available there. Can u kindly provide me the links where I can send my project proposal and direcly interact with the mentors. I hope my "Smart IPC" may enrich the smart boost c++ libraries towards smarter c++ libraries. -- Thanking You, Regards Subrata Biswas MTech (pursuing) Computer Science and Engineering Indian Institute of Technology, Roorkee Mob: +91 7417474559

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C++ Now! Conference Program Highlights C++11
by Jon Kalb 17 Mar '12

17 Mar '12

C++ Now! (formerly BoostCon) is pleased to announce its 2012 program with 35+ inspiring C++ practitioners delivering more than fifty technical sessions. In honor of the release of the new C++11 standard, this May's conference will, for the first time, be offered in three tracks. In addition to the sessions that attendees have come to expecton topics like library design and usage, programming techniques, best practices, academic research, development tools, concurrency, reliability, and performancethis year's program includes a full track devoted to C++11 <http://cppnow.org/locations/c11/> and three keynotes by industry luminaries <http://cppnow.org/overview/> . For those eager to get on board with the new standard, the C++11 content features fifteen hours of tutorial material covering the most important new features and APIs, presented, in many cases, by the language designers themselves. C++ Now! is offering the most complete C++11 tutorial coverage of any conference this year! Conference speakers include book and library authors, academics, C++ Standard Committee members, tool builders, architects, and engineers. With our very high presenter-to-audience ratio, attendees will have ample opportunity for one-on-one interaction with leaders who are currently defining the state of the art in C++. Dave Abrahams, the conference co-chair, writes, "We planned for an expansion, but even I am surprised at the presenter response and the resulting depth of this year's program. I'm preparing for a flood of new attendees." Reserve your place today at http://cppnow.org/registration C++ Now! 2012, held May 13-18 in Aspen Colorado is hosted by Boost in cooperation with ACM. * Complete program: http://cppnow.org/schedule * Speakers: http://cppnow.org/participants * Registration: http://cppnow.org/registration Jon

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[format] Mistake in documentation
by Yakov Galka 17 Mar '12

17 Mar '12

The current documentation ( http://www.boost.org/doc/libs/1_49_0/libs/format/doc/format.html) says: "In the Open-group specification, referring to the same argument several times (e.g. *"%1$d %1$d"*) has undefined behaviour." Perhaps it was right some time ago, but it's not longer true. The Open-group specification ( http://pubs.opengroup.org/onlinepubs/009695399/functions/fprintf.html) explicitly allows this: "In format strings containing the "%*n*$" form of conversion specification, numbered arguments in the argument list can be referenced from the format string as many times as required." Thank you, -- Yakov

1 0

Begin Contributing to Boost
by Sathyam Vellal 17 Mar '12

17 Mar '12

Hi. I would like to contribute to the Boost.Graph library. The issues and challenges are presented here < http://www.boost.org/doc/libs/1_49_0/libs/graph/doc/challenge.html> Can somebody please guide me how to begin? I'd really love to be a part of this community! -- Sathyam M Vellal

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