June 2012 - Boost-users - lists.preview.boost.org

Program Options: What would be involved in implementing add_options()(optionNameWork, po::value<std::pair<int, float>>() ?
by Charles Mills 30 Jun '12

30 Jun '12

I really like Boost Program Options. I came up with this wild hare of being able to handle something like foo= int float Obviously, I could do it by instead using foo_int= int foo_float= float But what would be involved in being able to do something like add_options()(optionNameWork, po::value<std::pair<int, float>>() ? I would have to derive a class from boost::program_options::value_semantic? I would have to implement all of the abstract methods? The other classes also like abstract_variables_map? Or just variable_value? Volodya wrote in response to an earlier question "I would imagine this to be not hard. Either define operator>> for the class you use to represent rectangles, over override 'validate'" Is that what I should? Define operator>> for pair<int, float> ? Where is an example of a boost::program_options >> operator? Where is validate() declared? Sorry to be such a newbie at this level of C++ programming. You have to start somewhere. Charles

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Re: [Boost-users] [boost] Meeting C++ - Call for Papers
by Jens Weller 30 Jun '12

30 Jun '12

Hi, small update on this: As some people haved asked: The session length will be 45 minutes, some talks might extend to 90 min. There is now a form to submit your talk: http://meetingcpp.com/index.php/submit-your-talk.html Call for Papers should end at 15. July 2012 Tickets will also be available in July. regards, Jens Weller -------- Original-Nachricht -------- > Datum: Wed, 27 Jun 2012 16:45:54 +0200 > Von: Matus Chochlik <chochlik(a)gmail.com> > An: boost(a)lists.boost.org > Betreff: [boost] Meeting C++ - Call for Papers > On Wed, Jun 27, 2012 at 4:08 PM, Jens Weller <JensWeller(a)gmx.de> wrote: > > Dear C++/boost community! > > > > I'm proud to announce the call for papers for the Meeting C++ > conference! > > After having talked to some people in Aspen about the plans for a C++ > conference in Germany, I've decided to give it a try. > > Meeting C++ will take place in November in Germany, as a 2 Day C++ > conference. > > > > Thank You for organizing this conference! -- Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de

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[1.50.0] Boost release 1.50.0 available
by Beman Dawes 29 Jun '12

29 Jun '12

Release 1.50.0 of the Boost C++ Libraries is now available. These open-source libraries work well with the C++ Standard Library, and are usable across a broad spectrum of applications. The Boost license encourages both commercial and non-commercial use. This release contains four new libraries (Algorithm, Functional/OverloadedFunction, LocalFunction and Utility/IdentityType) and numerous enhancements and bug fixes for existing libraries. For details, including download links, see http://www.boost.org/users/news/version_1_50_0 You can also download directly from SourceForge: http://sourceforge.net/projects/boost/files/boost/1.50.0/ To install this release on your system, see http://www.boost.org/doc/libs/release/more/getting_started/index.html Thanks, --The Boost release team Beman Dawes Daniel James Eric Niebler Marshall Clow Rene Rivera Vladimir Prus

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[Boost.Python] Is it possible classes X Y returned each other?
by Sergiy Nazarenko 29 Jun '12

29 Jun '12

Hi, all! I'm writing python module and run into obstacle. I need a couple of classes which can return instance of each other. This is part of my module: /// mysupermodule.cpp ... struct X { X():s("default") {} X(std::string s):s(s) {} Y getY() const { return Y(); } }; struct Y { Y():s("default") {} Y(std::string s):s(s) {} X getX() const { return X(); } }; ... /// And I got obvious error: mysupermodule.cpp:45:5: error: ‘Y’ does not name a type. How can I solve this task? Regards Sergiy

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boost 1.50 different libraray naming?
by Szymon Gatner 29 Jun '12

29 Jun '12

Hi, I just build v 1.50 on Win 7 / Visual Studio 2008 SP1 (msvc9) and I am getting linker errors like: Error 21 fatal error LNK1104: cannot open file 'libboost_filesystem-vc90-mt-gd-1_50.lib' test test because in this release files are named without "90" part: libboost_filesystem-vc-mt-gd-1_50 while in 1.49 (and below): libboost_exception-vc90-mt-gd-1_49 Regards, Szymon Gatner

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[ptr_container] Regression: ptr_multimap breaks Wextra build in version 1.49.0
by Philipp Münzel 29 Jun '12

29 Jun '12

Hi fellows, I'm using gcc 4.2.1 on OSX 10.7.4 and I've recently updated from boost 1.47 to 1.49.0. My project uses ptr_multimaps. My project is configured to use the gcc flags -Werror -Wall -Wextra because I like to be alerted early if something can go wrong. Using -Werror is kind of a self-imposed restriction to keep my code clean of dirty hacks. I've been used to compile my code this way since about boost 1.44. With the update to 1.49 however, building with -Werror -Wextra is no longer possible, because I'm getting the following warning: /usr/local/boost/include/boost/ptr_container/ptr_map_adapter.hpp: In copy constructor 'boost::ptr_multimap_adapter<T, VoidPtrMultiMap, CloneAllocator, Ordered>::ptr_multimap_adapter(const boost::ptr_multimap_adapter<T, VoidPtrMultiMap, CloneAllocator, Ordered>&) [with T = Foo, VoidPtrMultiMap = std::multimap<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, void*, std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, void*> > >, CloneAllocator = boost::heap_clone_allocator, bool Ordered = true]': /usr/local/boost/include/boost/ptr_container/ptr_map.hpp:89: instantiated from here /usr/local/boost/include/boost/ptr_container/ptr_map_adapter.hpp:727: warning: base class 'class boost::ptr_container_detail::ptr_map_adapter_base<Foo, std::multimap<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, void*, std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, void*> > >, boost::heap_clone_allocator, true>' should be explicitly initialized in the copy constructor The only possibility to compile this is to remove -Wextra, because gcc has no separate warning option to turn off the copy constructor check (see [1]), so I lose not only this check, but also everything else enabled by -Wextra, which I'd be very unhappy with. For the time being, I just removed -Werror, but this totally clutters up my build output now, which usually allows me to spot every problem really quick, because it is so brief. Since this is a regression (it worked until the 1.49.0 update), I'd be happy if someone can check how this was introduced in 1.49.0 and open a ticket for the incriminating change. Regards, Philipp [1] http://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html

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Re: [Boost-users] Visual Studio Express
by Tom Kent 28 Jun '12

28 Jun '12

Last I checked, the express editions of visual studio (vc8,vc9,vc10) wouldn't build all the debugging info into libraries. I just went searching on Microsoft's website, but couldn't find anywhere that spells out what is/isn't included with the express versions. Beyond that, there have been announcements that the VC11 express version wasn't going to be able to make non-metro apps. I think they have gone back on this, but it still sounds like it will be limited. I haven't looked into this issue for a few years, so it is quite likely that I'm wrong. I'd love to hear from someone with better knowledge on this issue. Tom On Thu, Jun 28, 2012 at 12:52 PM, David Sankel <camior(a)gmail.com> wrote: > On Thu, Jun 28, 2012 at 10:13 AM, Tom Kent <lists(a)teeks99.com> wrote: > >> I've built windows libraries (vc8, vc9, vc10) for this (32 and 64 >> bit), if you want them, you can get them from my website: >> http://boost.teeks99.com >> >> I'm also looking for a donation of VC11 when it comes out (express won't >> work). >> > > Why won't express work? > > David > > -- > David Sankel > Sankel Software > www.sankelsoftware.com > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users >

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self-referential boost functions
by Adam Crain 28 Jun '12

28 Jun '12

Inquiring as to whether this is possible or if there is a better pattern for simulating this behavior... Is it possible for boost::function to be self referential? I.e. how do I simulate behavior like the following: typedef boost::function<Func (int)> Func; A function that does something mutable and then returns the next function to be called or an empty function. thanks, Adam

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Re: [Boost-users] compilation error using boost/property_tree/ptree.hpp
by Pramod Subramanyan 28 Jun '12

28 Jun '12

Thanks for the tip, Lars. That was indeed the problem - one of the libraries we are using was defining a fail macro. Pramod

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compilation error using boost/property_tree/ptree.hpp
by Pramod Subramanyan 28 Jun '12

28 Jun '12

I am trying to use boost/property_tree/ptree.hpp in my application. All I have done so far is just add the following include statements to my program: > #include <boost/property_tree/ptree.hpp> > #include <boost/property_tree/xml_parser.hpp> After adding these lines, I compiled my modified application using g++ 4.6.3 on Ubuntu 12.04. I get the following errors: g++ -c -Wall -Werror -I../cudd-2.4.2//include/ -I /home/pramod/libraries/boost_1_50_0/ -O2 -Wno-unused-result -Wno-unused-function -c -o main.o main.cpp In file included from /home/pramod/libraries/boost_1_50_0/boost/property_tree/ptree.hpp:17:0, from main.h:10, from main.cpp:17: /home/pramod/libraries/boost_1_50_0/boost/property_tree/stream_translator.hpp: In static member function ‘static void boost::property_tree::customize_stream<Ch, Traits, bool, void>::extract(std::basic_istream<_CharT, _Traits>&, bool&)’: /home/pramod/libraries/boost_1_50_0/boost/property_tree/stream_translator.hpp:117:18: error: expected unqualified-id before ‘{’ token /home/pramod/libraries/boost_1_50_0/boost/property_tree/stream_translator.hpp:117:18: error: expected ‘)’ before ‘{’ token /home/pramod/libraries/boost_1_50_0/boost/property_tree/stream_translator.hpp: In member function ‘boost::optional<E> boost::property_tree::stream_translator<Ch, Traits, Alloc, E>::get_value(const internal_type&)’: /home/pramod/libraries/boost_1_50_0/boost/property_tree/stream_translator.hpp:191:20: error: expected unqualified-id before ‘{’ token /home/pramod/libraries/boost_1_50_0/boost/property_tree/stream_translator.hpp:191:20: error: expected ‘)’ before ‘{’ token make: *** [main.o] Error 1 When I look the lines117 and 191 in ptree.hpp, they are the following: s >> e; if(s.fail()) { // Try again in word form. and customized::extract(iss, e); if(iss.fail() || iss.bad() || iss.get() != Traits::eof()) { return boost::optional<E>(); I can't spot anything obviously wrong with either of these lines. Does anyone have any clues on what could be going wrong? Thanks! Pramod

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