December 2015 - Boost-users - lists.preview.boost.org

Johnson all pair shortest path and output in a C array
by Paolo Bolzoni 22 Dec '15

22 Dec '15

Dear list, I need to get the all pair shortest path in a C array, to pass it to a java program. However johnson all pair shortest path[1] requires a BasicMatrix[2] as output, so a simple array won't do. At the moment I used few classes (see Matrix and MatrixR[3]) as wrapper around a std::vector and it works fine, but I was wondering if I am missing a simpler solution. Is there? Yours faithfully, Paolo [1]http://www.boost.org/doc/libs/release/libs/graph/doc/johnson_all_pairs_sh… [2]http://www.boost.org/doc/libs/release/libs/graph/doc/BasicMatrix.html [3] struct Matrix { Matrix(std::vector<int64_t>& storage, size_t rows, size_t columns) : m_(storage), columns_(columns) { m_.clear(); m_.resize(rows * columns_, int64_t{0}); } int64_t& get(size_t row, size_t column) { return m_[row * columns_ + column]; } std::vector<int64_t>& m_; size_t columns_; }; struct MatrixR; struct MatrixRR { MatrixRR(MatrixR const& m, size_t column) : m_(m), column_(column) {} int64_t& operator[] (size_t row) const; MatrixR const& m_; size_t column_; }; struct MatrixR { MatrixR(Matrix& m) : m_(m) {} MatrixRR operator[] (size_t column) const { return MatrixRR(*this, column); } Matrix& m_; }; int64_t & MatrixRR :: operator[] (size_t row) const { return m_.m_.get(row, column_); }

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Re: [Boost-users] [container] Boost 1.60 Release link error
by Hickman, Steve (AdvTech) 21 Dec '15

21 Dec '15

I'm using VS2012 on Win 7 64bit building 32bit executables. --- Steve H. From: Hickman, Steve (AdvTech) Sent: Monday, December 21, 2015 11:14 AM To: 'boost-users(a)lists.boost.org' <boost-users(a)lists.boost.org> Subject: [container] Boost 1.60 Release link error Getting a linker error with the Windows version of Boost on release only (not debug) using v 1.60. This did not show up with 1.58 (I skipped 1.59 so I have no comment on it). I'm using the prebuilt libraries: 8> Creating library D:\GITRepos\fd_x-current_feature\source\Devices\MockDevice\Test\Release\MockTest.lib and object D:\GITRepos\fd_x-current_feature\source\Devices\MockDevice\Test\Release\MockTest.exp 8>MockDevice.lib(Mock.obj) : error LNK2001: unresolved external symbol "public: void __thiscall boost::container::container_detail::has_member_function_named_construct<class boost::container::new_allocator<char> >::BaseMixin::construct(void)" (?construct@BaseMixin@?$has_member_function_named_construct@V?$new_allocator@D@container@boost@@@container_detail@container@boost@@QAEXXZ) 8>MockDevice.lib(Mock.obj) : error LNK2001: unresolved external symbol "public: void __thiscall boost::container::container_detail::has_member_function_named_construct<class boost::container::new_allocator<struct boost::container::container_detail::tree_node<struct std::pair<class boost::container::basic_string<char,struct std::char_traits<char>,class boost::container::new_allocator<char> > const ,struct boost::interprocess::ipcdetail::ref_count_ptr>,void *,0,1> > >::BaseMixin::construct(void)" (?construct@BaseMixin@?$has_member_function_named_construct@V?$new_allocator@U?$tree_node@U?$pair@$$CBV?$basic_string@DU?$char_traits@D@std@@V?$new_allocator@D@container@boost@@@container@boost@@Uref_count_ptr@ipcdetail@interprocess@3@@std@@PAX$0A@$00@container_detail@container@boost@@@container@boost@@@container_detail@container@boost@@QAEXXZ) 8>D:\GITRepos\fd_x-current_feature\source\Devices\MockDevice\Test\Release\MockTest.exe : fatal error LNK1120: 2 unresolved externals Steve Hickman System Architect, Human Machine Collaboration Honeywell | Aerospace Office: 480-236-8367 steve.hickman(a)honeywell.com<mailto:steve.hickman@honeywell.com> https://in.honeywell.com/sites/aero/Pages/Home.aspx

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segfault using boost::thread_specific_ptr
by Michael P. Soulier 21 Dec '15

21 Dec '15

Hello, I’m trying to implement a thread-safe logger that uses a boost::thread_specific_ptr to a std::stringstream as a logging buffer. static boost::thread_specific_ptr<std::stringstream> tls_buffer; class MLoggerHandler { public: MLoggerHandler(boost::mutex& mutex, std::ostream& ostream); ~MLoggerHandler(); void setLevel(int level); template <class T> // For handling << from any object. MLoggerHandler& operator <<(T input) { std::cerr << "Adding to buffer" << std::endl; if (m_start) { *tls_buffer << localDateTime() << " " << input; <================= SEGFAULT m_start = false; } else { *tls_buffer << input; } std::cerr << "On buffer: " << tls_buffer->str() << std::endl; return *this; } // For handling std::endl std::ostream& operator <<(std::ostream& (*f)(std::ostream&)) { std::cerr << "Flushing buffer" << std::endl; m_start = true; std::ostream& rv = f(m_ostream); m_mutex.lock(); m_ostream << tls_buffer->str(); m_mutex.unlock(); tls_buffer->str(""); return rv; } private: // A flag to indicate the beginning of a new line. bool m_start = true; // A mutex passed in from the main logger for synchronization. boost::mutex& m_mutex; // The logging level. int m_level; // The output stream. std::ostream& m_ostream; // Return the current date and time as a localized string. const std::string localDateTime(); }; The initial idea, was to flush the buffer and write when a terminating std::endl was encountered. But, just trying to dereference the pointer and write to the std::stringstream is crashing. Do I need to initialize the std::stringstream, or is it initialized in constructor? Thanks, Mike

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Problems building with Windows 10.0.10586.0 SDK
by Isaac Lascasas 21 Dec '15

21 Dec '15

I have just downloaded boost 1.60 for a regular update, I have found some kind of build problem with my environment (vs2015 update 1 with Windows SDK 10.0.10586.0). I usually just do this to get a build: call bootstrap b2 headers bjam --build-type=complete --toolset=msvc-14.0 -j13 address-model=64 stage I have never required vcvarsall.bat as boost build allways finds its way. However today it wasn't able to find my windows headers so I manually did this: %comspec% /k ""C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat"" x86_amd64 10.0.10586.0 Even so I found that boost was looking for sdk 10.0.10240.0 (an older one). In my system I still had that sdk directory, however it only contained some UCRT stuff. I uninstalled deliberately that version with my visual studio setup some days ago to upgrade to the new SDK. Until now I didn't found any problems. Maybe you should check this out a bit, I can't figure out if this is a problem of my environment, microsoft or boost build. Bringing 10240 back allows me to build boost 1.60 without any problems. My biggest concern is that boost is building against 10240 when 10586 is available and both are installed, even after an explicit vcvars call to stick to 10586. Best, Isaac Lascasas.

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Duplicate function in composite_key.hpp ?
by John M. Dlugosz 21 Dec '15

21 Dec '15

I'm getting E:\C++Libs\boost_1_59_0\boost/multi_index/composite_key.hpp(638): error C2535: 'boost::multi_index::composite_key_result<boost::multi_index::composite_key<const vst::Foo1::Bar2::Baz3,boost::multi_index::const_mem_fun<vst::Foo1::Bar2::Baz3,UID,UID vst::Foo1::Bar2::Baz3::owner(void) const>,boost::multi_index::member<vst::Foo1::Bar2::Baz3,const uint32_t,pointer-to-member(0x18)>,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>> boost::multi_index::composite_key<const vst::Foo1::Bar2::Baz3,boost::multi_index::const_mem_fun<vst::Foo1::Bar2::Baz3,UID,UID vst::Foo1::Bar2::Baz3::owner(void) const>,boost::multi_index::member<vst::Foo1::Bar2::Baz3,const uint32_t,pointer-to-member(0x18)>,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>::operator ()(const boost::reference_wrapper<const Class> &) const': member function already defined or declared with [ Class=vst::Foo1::Bar2::Baz3 ] (compiling source file Bar2\Delta.cpp) (actual names from my code have been sanitized) Using Boost 1.59 and VS2015. The function it points to is result_type operator()(const reference_wrapper<value_type>& x)const but the error message looks like it is duplicating the previous function in the file, result_type operator()(const reference_wrapper<const value_type>& x)const and the chain of instantiation comes through composite_key.hpp, detail/ord_index_args.hpp(46), mpl/eval_if.hpp(41), detail/ord_index_args.hpp(70), ordered_index.hpp(65) with [ Arg1=boost::multi_index::tag<UID,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na>, Arg2=boost::multi_index::composite_key<const vst::Foo1::Bar2::Baz3,boost::multi_index::const_mem_fun<vst::Foo1::Bar2::Baz3,UID,UID vst::Foo1::Bar2::Baz3::owner(void) const>,boost::multi_index::member<vst::Foo1::Bar2::Baz3,const uint32_t,pointer-to-member(0x18)>,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>, Arg3=boost::mpl::na ] What's going on here? This worked previously with Boost 1.55 and VS2010.

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[serialization] How to serialize an atomic<> value?
by Merrill Cornish 20 Dec '15

20 Dec '15

I am running Boost_1_60_0 on Windows 10 64bit on MinGW64: I have this class data member I want to serialize: std::atomic< std::time_t > mUpdate; Since I'm on a 64-bit machine, serialization recognizes that as atomic< long long int >. However, given ar & mUpdate; serialization says it does not know how to serialize atomic< long long int >. My solution, which compiles cleanly, is std::time_t updateTime = mUpdateTime.load(); ar & updateTime; mUpdateTime = updateTime; // assign is atomic My reasoning is that on load (ar => mUpdateTime), the first line is useless, but harmless. Similarly, on save (ar <= mUpdateTime), the last line is redundant, but also harmless. Of course, the application is not executing during serialization and de-serialization. As I said, this compiles without error or warning; but I worry that I have missed something. Any thoughts? Merrill Cornish Once I see how to get the above working, my next project will be std::atomic< std::shared_ptr< boost::variant<...> > mValue;

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Why does BOOST_TEST() treat std::string as a collection?
by Brad Spencer 20 Dec '15

20 Dec '15

Why does BOOST_TEST() compare std::string values as collections instead of scalars (by default)? It's odd that the following produce different output, for example: BOOST_TEST(std::string("a") == "b"); BOOST_TEST(std::string("a") == std::string("b")); This will output: test.cc(6): error: in "test": check std::string("a") == "b" has failed [a != b] test.cc(7): error: in "test": check std::string("a") == std::string("b") has failed Note the lack of "[a != b]" on the second case. Also note that BOOST_CHECK_EQUAL() would emit as in the first form. This seems to be because std::string is_forward_iterable, and thus falls into the collection_comparison_op.hpp comparators instead of the scalar comparators. Is this intentional or an oversight? As a simple fix, adding a condition to the partial specialization of the collection_comparison_op.hpp comparators that specifically excludes std::string is enough to have std::string treated as scalars. For example, to handle std::string but not std::wstring with C++11 support: template<typename Lhs,typename Rhs> struct name<Lhs,Rhs,typename boost::enable_if_c< unit_test::is_forward_iterable<Lhs>::value && unit_test::is_forward_iterable<Rhs>::value && !(std::is_same<typename std::decay<Lhs>::type, std::string>::value || std::is_same<typename std::decay<Rhs>::type, std::string>::value) >::type (The above is an example and not a complete change supporting std::wstring and C++98.) -- Brad Spencer

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Boost.Serialization broken for wchar_t
by gast128 19 Dec '15

19 Dec '15

following code used to work in boost 1.57 void f() { std::wstring wstr = L"\u20AC"; std::wofstream ofs(L"c:\\temp\\bla.xml"); boost::archive::xml_woarchive oa(ofs); oa << boost::serialization::make_nvp("tag", wstr); } However in 1.60 it gives an exception, since it cannot convert the uniocde character. It seems that in 1.57 in xml_woarchive_impl the utf8_codecvt_facet is set, but this has been disabled in 1.60. What is the solution / workaround?

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boost::property_tree::read_json fails on previously supported comments 1.59
by Millman, Mark 18 Dec '15

18 Dec '15

I recently upgraded from 1.56 to 1.59 and my hundreds of well commented JSON parameter files now all fail on the first commented line. This is true for /* */ and // style comments. The exception.what() string thrown by boost::property_tree::read_json(filename,propertyTree) is filename.json(linenumber): expected key string. As I remove comments from my test JSON file the line number advances to the next comment. Any hints as to how to deal with this? Removing all my comments is not an option. Thanks, Mark --

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[boost.users] [statechart] question about event processing rules in orthogonal states.
by Ernesto Rodriguez Reina 18 Dec '15

18 Dec '15

Hi everyone, The statechart search for an event handler in post-order (children first then parent), however when we have orthogonal states involved then the behaviour I am experiencing is different. Let say we have an state X with two children [orthogonal] states Y and W. Assuming none of the handlers discard (or defer) an event, the handler for that event is called in the following order: Y, X, W, X. Note that the handler of X is called twice. The following code demonstrates the issue: <code> struct EvTest : sc::event< EvTest > {}; struct Test; struct Inner1; struct Inner2; struct Machine : sc::state_machine< Machine, Test > {}; struct Test : sc::simple_state<Test, Machine, mpl::list<Inner1, Inner2> >{ typedef sc::custom_reaction< EvTest > reactions; sc::result react( const EvTest){ std::cout << "Test" << std::endl; // return discard_event(); return forward_event(); } }; struct Inner1 : sc::simple_state<Inner1, Test::orthogonal< 0 > >{}; struct Inner2 : sc::simple_state<Inner2, Test::orthogonal< 1 > >{ typedef sc::custom_reaction< EvTest > reactions; sc::result react( const EvTest){ std::cout << "Inner2" << std::endl; return forward_event(); } }; </code> When the event "EvTest" is received, the output I am getting is: <output> Test Inner2 Test </output> If there something that I am missing? Best, Ernesto Rodriguez Reina

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