- Boost-users - lists.boost.org

Boost Serialization - Overriding builtin implementation for std::wstring
by cpp_learner 05 Dec '14

05 Dec '14

Hi: The current serialization implementation for std::wstring is not portable across platforms. To make it cross platform, we would like to customize the serialization implementation for std::wstring (by splitting "serialize" and providing our own implementation for "save/load"). Is it possible to achieve this? One way to get around this is to provide our own implementation, and not include the header boost/serialization/string.hpp. This is not an option to us as there is no way for us to enforce clients to not include this header at all either directly or indirectly. And unfortunately, the compiler does not complain if the same compilation unit has two different serialization mechanism for std::wstring (the builtin and customized serialization implementation, in which case the builtin serialization implementation is picked, which is not portable). Many Thanks AB

1 0

Fusion Move Semantics
by Ovanes Markarian 05 Dec '14

05 Dec '14

Hi! I would like to ask does fusion supports move semantics, or are all the values going to get copied. I use C++11 (clang with libstdcxx) and boost 1.54 (but can upgrade). In my use case I have boost::fusion::map and was wondering, that in case of moving of that map, is it going to forward the move call to contained values or not. Many thanks for help, Ovanes

3 2

Boost BGL question regarding depth_first_visit / undirected_depth_first_visit
by Mark Fanara 04 Dec '14

04 Dec '14

I am looking to add a TerminatorFunc to undirected_depth_first_visit similar to what is in depth_first_visit. I think I have successfully made the changes through mimicry (I am an old school C++ guy and still don't understand generic programming) My problem is that I don't know how to declare/define my own terminate function. Nor do I know how to call undirected_depth_first_visit with the new argument. I have tried searching for examples of calling depth_first_visit with a TerminatorFunc argument, but can't find anything helpful. Appreciate any suggestions you might have.

1 0

Marriage of boost::any_range and boost::fusion?
by Ernest Zaslavsky 03 Dec '14

03 Dec '14

I'm trying to achieve the following. I have an any_range of const items, in runtime I need dynamically calculate and store values for each item, lets say two additional integers, what I expect to get in the end is an any_range with something like joint view of my const item and two integers. Is it possible? [Read More]<http://feeds.feedburner.com/~r/sizmek-blog/~6/1> [http://www.sizmek.com/Sizmek.png]<http://www.sizmek.com/>

1 0

Re: [Boost-users] how to lisk unique keys in boost multi_index_container
by Bill Tian 03 Dec '14

03 Dec '14

thanks for JoaquÃn M LÃ³pez MuÃ±oz 's reply. i have tried your code, it works as i need exactly. for(auto it=data.get<1>().begin(),it_end=data.get<1>().end(); it!=it_end; it=data.get<1>().upper_bound(it->m2)){ std::cout<<it->m2<<"\n"; // or whatever you need to do with the key } i'll use this method in reality, thanks! Bill

1 0

how to lisk unique keys in boost multi_index_container
by Bill Tian 03 Dec '14

03 Dec '14

hello,every one now i have a struct like this struct a { a(const std::string &m1_, const std::string &m2_, boost::int16_t m3_) : m1(m1_),m2(m2_), m3(m3_) {} std::string m1; std::string m2; boost::int16_t m3; }; typedef boost::multi_index::multi_index_container < a, boost::multi_index::indexed_by< boost::multi_index::hashed_unique< BOOST_MULTI_INDEX_MEMBER(a, std::string, m1) >, boost::multi_index::ordered_non_unique< BOOST_MULTI_INDEX_MEMBER(a, std::string, m2) >, boost::multi_index::ordered_non_unique < BOOST_MULTI_INDEX_MEMBER(a, boost::uint16_t, m3) > > > my_data; i want to list all unique keys of m2 and m3 after the container has been filled with a lot of records, is there a example ? my_data data; data.insert(a("a1","k1", 1)); data.insert(a("a2","k1", 2)); data.insert(a("a3","k2", 3)); ..... data.insert(a("a10000","k1", 1)); i want to get all data that m2 equal to "k1", when this data has been processed, get all data that m2 equal to "k2" ... but i do not how many unique keys in the container, am i need to store another set to store that when i fill the container? i need a function to get the keys like the SQL:"select distinct(m2) from data". thanks a lot! best regards. Bill

2 1

Error "Used Uninitialized" in boyer_myrvold_impl.hpp
by wanglurg 03 Dec '14

03 Dec '14

Hi, guys, I'm a new boost graph library user. I met an error when using boyer_myrvold_planar_test() function in Boost_1_55_0 to generate the kuratowski subgraph. Error message is listed as follows: ./boost/graph/planar_detail/boyer_myrvold_impl.hpp:1545:11 error: 'z' may be used uninitialized in this function. I added a "Wno-maybe-uninitialized" flag to Makefile to remove this error temporarily, but it's not a good method. I'm looking for a better way to fix this. Does anyone encounter the same case? Best regards, Lu Wang -- View this message in context: http://boost.2283326.n4.nabble.com/Error-Used-Uninitialized-in-boyer-myrvol… Sent from the Boost - Users mailing list archive at Nabble.com.

2 2

Does Boost 1.56 boost::async support auto scheduling (launch deferred)?
by Adi Shavit 02 Dec '14

02 Dec '14

Hi, Onc of the design choices for async() default launch policy was to allow the OS scheduler to decide whether or not to launch a new thread or remain on the same thread (presumably based on available system resources). Does Boost 1.56 or 1.57 support this default auto scheduling yet? It seems to be launching as many threads as tasks. Thanks, Adi

2 2

Boost build and first program
by Great Avenger Singh 02 Dec '14

02 Dec '14

Hi I am first time boost user. I build it using following procedure on Ubuntu Linux 14.04. cd /boost-src/ ./bootstrap.sh and followed instructions. after the completion it gave me following suggestion: The Boost libraries were successfully built. Following directory should be included to compiler include paths; /home/metal-machine/boost-src Following directory should be included to linker library paths; /home/metal-machine/boost-src/stage/lib Now I try to compile and program with following options from command line: $ g++ -I "/home/metal-machine/boost-src/" -L "/home/metal-machine/boost-src/stage/lib/" boostlist.cpp -lboost_system -lboost_filesystem -o honey $ ./honey ./honey: error while loading shared libraries: libboost_system.so.1.57.0: cannot open shared object file: No such file or directory But on the other hand if I compile and run as follows: $ g++ boostlist.cpp -lboost_system -lboost_filesystem -o honey $./honey ->it works fine I am using thiscode: https://gist.github.com/vivithemage/9517678 Where I am doing wrong? -- Thanks Arshpreet Singh http://arshpreetsingh.wordpress.com/ “If we all did the things we are really capable of doing, we would literally astound ourselves …” T. E. ------------------------------------------------------------------------------ Slashdot TV. Video for Nerds. Stuff that matters. http://tv.slashdot.org/

3 2

fatal error: 'boost/utility/detail/result_of_iterate.hpp' file not found
by Ted Middleton 02 Dec '14

02 Dec '14

I'm trying to build boost 1.56.0 for OSX 10.10 with Xcode 5.1.1 (clang-503.0.40). Xcode 5.1.1 Build version 5B1008 Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn) Target: x86_64-apple-darwin14.0.0 Thread model: posix When I try to build boost thread, the compile fails building thread.cpp on the command: "g++" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline -Wall -pedantic -gdwarf-2 -fexceptions -Wno-long-long -Wextra -Wno-long-long -Wno-variadic-macros -Wunused-function -fpermissive -pedantic -DBOOST_ALL_NO_LIB=1 -DBOOST_ATOMIC_STATIC_LINK=1 -DBOOST_SYSTEM_STATIC_LINK=1 -DBOOST_THREAD_BUILD_LIB=1 -DBOOST_THREAD_DONT_USE_CHRONO -DBOOST_THREAD_POSIX -DNDEBUG -I"." -c -o "bin.v2/libs/thread/build/darwin-4.2.1/release/link-static/threading-multi/pthread/thread.o" "libs/thread/src/pthread/thread.cpp" The error is: In file included from libs/thread/src/pthread/thread.cpp:19: In file included from ./boost/thread/future.hpp:22: In file included from ./boost/thread/detail/invoker.hpp:28: In file included from ./boost/utility/result_of.hpp:202: ./boost/preprocessor/iteration/detail/iter/forward1.hpp:47:18: fatal error: 'boost/utility/detail/result_of_iterate.hpp' file not found ./boost/preprocessor/iteration/detail/iter/forward1.hpp:27:56: note: expanded from macro 'BOOST_PP_FILENAME_1' # define BOOST_PP_FILENAME_1 BOOST_PP_ARRAY_ELEM(2, BOOST_PP_ITERATION_PARAMS_1) ^ ./boost/utility/result_of.hpp:201:68: note: expanded from macro 'BOOST_PP_ITERATION_PARAMS_1' #define BOOST_PP_ITERATION_PARAMS_1 (3,(0,BOOST_RESULT_OF_NUM_ARGS,<boost/utility/detail/result_of_iterate.hpp>)) ^ ./boost/preprocessor/array/elem.hpp:23:114: note: expanded from macro 'BOOST_PP_ARRAY_ELEM' # define BOOST_PP_ARRAY_ELEM(i, array) BOOST_PP_TUPLE_ELEM(BOOST_PP_ARRAY_SIZE(array), i, BOOST_PP_ARRAY_DATA(array)) ^ note: (skipping 10 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all) ./boost/preprocessor/tuple/rem.hpp:23:31: note: expanded from macro 'BOOST_PP_REM' # define BOOST_PP_REM(...) __VA_ARGS__ ^ ./boost/preprocessor/variadic/elem.hpp:26:89: note: expanded from macro 'BOOST_PP_VARIADIC_ELEM' # define BOOST_PP_VARIADIC_ELEM(n, ...) BOOST_PP_CAT(BOOST_PP_VARIADIC_ELEM_, n)(__VA_ARGS__,) ^ ./boost/preprocessor/variadic/elem.hpp:30:55: note: expanded from macro 'BOOST_PP_VARIADIC_ELEM_2' # define BOOST_PP_VARIADIC_ELEM_2(e0, e1, e2, ...) e2 Sure enough, boost/utility/detail/result_of_iterate.hpp doesn't exist from the base of the project. It does if you start at libs/utlility/include/boost/utility/detail, though. Most of what's in boost/ is a symlink to directories in libs (I guess this is how modulization works), and if boost/utility were a symlink libs/utility/include/boost/utility, I think this code in forward1.hpp would work. But boost/utility isn't a symlink - boost/utility is an actual directory with a few symlinks to files in it, but none of them leads to result_of_iterate.hpp. There's an email (http://lists.boost.org/Archives/boost/2014/07/215233.php) to the developers list from back in July discussing this build break in the 1.56.0 beta 1, but I'm seeing this at the tag boost-1.56.0 for the 1.56.0 release in git.I don't seem to be able to build 1.57.0 either. Boost 1.56.0 wouldn't have shipped with a broken boost thread compile on OSX 64-bit, so I'm certain that its something bad that I've done. Can anyone figure out what I'm doing wrong from that command line or the error printout?

1 1