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Build: Clang, libstdc++ and Mac 10.8
by Tim Burgess 07 Feb '14

07 Feb '14

Hi, Due to the requirements of another library I have to use, I need to build Boost 1.55.0 on my Mac 10.8 system using the libstdc++ STL library, rather then libc++. I've now got myself royally confused with the build configuration process, as to where I specify toolsets and other options to achieve what I need. I'm failing with: Cd /users/tim/developer/libraries/boost_1_55_0 ./b2 clean sudo sh bootstrap.sh macosx-version=10.8 macosx-version-min=10.7 architecture=combined threading=multi link=static address-model=32_64 ./b2 toolset=clang -std=c++11 cxxflags="-stdlib=libstdc++" linkflags="-stdlib=libstdc++" I don't actually need the c++11 support. Can anybody advise, please? Best wishes. Tim Burgess

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lexical_cast: fatal error
by Tim Burgess 07 Feb '14

07 Feb '14

Hi, Using 1.55.0 in my Xcode project with clang as the compiler I'm getting: "/boost/type_traits/is_fundamental.hpp:26:20: fatal error: recursive template instantiation exceeded maximum depth of 128"::boost::is_arithmetic<T>::value This error is triggered by me including lexical_cast.hpp. Has anybody else encountered this and, if so, found a solution, please? Best wishes. Tim Burgess

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Boost Accumulators Tail
by Jon Lederman 06 Feb '14

06 Feb '14

Hi, I am a newbie to using boost accumulators. I have tried a simple program using examples from the boost website. I have something as simple as: #include <boost/accumulators/accumulators.hpp> #include <boost/accumulators/statistics/stats.hpp> #include <boost/accumulators/statistics/tail.hpp> include <boost/accumulators/statistics/tail_quantile.hpp> using namespace boost::accumulators; typedef accumulator_set<double, stats<tag::tail_quantile<right> > > accumulator_t_right; typedef accumulator_set<double, stats<tag::tail_quantile<left> > > accumulator_t_left; accumulator_t_right acc0( tag::tail<right>::cache_size = 1000 ); accumulator_t_right acc1( tag::tail<right>::cache_size = 1000 ); accumulator_t_left acc2( tag::tail<left>::cache_size = 1000 ); accumulator_t_left acc3( tag::tail<left>::cache_size = 1000 ); I am met with: /usr/local/src/freeswitch/src/mod/applications/mod_soundtouch/mod_soundtouch.cpp:56:63: error: template argument 1 is invalid /usr/local/src/freeswitch/src/mod/applications/mod_soundtouch/mod_soundtouch.cpp:56:65: error: template argument 1 is invalid /usr/local/src/freeswitch/src/mod/applications/mod_soundtouch/mod_soundtouch.cpp:56:67: error: template argument 2 is invalid /usr/local/src/freeswitch/src/mod/applications/mod_soundtouch/mod_soundtouch.cpp:56:88: error: invalid type in declaration before ';' token /usr/local/src/freeswitch/src/mod/applications/mod_soundtouch/mod_soundtouch.cpp:57:62: error: template argument 1 is invalid /usr/local/src/freeswitch/src/mod/applications/mod_soundtouch/mod_soundtouch.cpp:57:64: error: template argument 1 is invalid /usr/local/src/freeswitch/src/mod/applications/mod_soundtouch/mod_soundtouch.cpp:57:66: error: template argument 2 is invalid /usr/local/src/freeswitch/src/mod/applications/mod_soundtouch/mod_soundtouch.cpp:57:86: error: invalid type in declaration before ';' token /usr/local/src/freeswitch/src/mod/applications/mod_soundtouch/mod_soundtouch.cpp:59:42: error: template argument 1 is invalid /usr/local/src/freeswitch/src/mod/applications/mod_soundtouch/mod_soundtouch.cpp:59:56: error: expected unqualified-id before '=' token /usr/local/src/freeswitch/src/mod/applications/mod_soundtouch/mod_soundtouch.cpp:60:42: error: template argument 1 is invalid /usr/local/src/freeswitch/src/mod/applications/mod_soundtouch/mod_soundtouch.cpp:60:56: error: expected unqualified-id before '=' token /usr/local/src/freeswitch/src/mod/applications/mod_soundtouch/mod_soundtouch.cpp:61:41: error: template argument 1 is invalid /usr/local/src/freeswitch/src/mod/applications/mod_soundtouch/mod_soundtouch.cpp:61:55: error: expected unqualified-id before '=' token /usr/local/src/freeswitch/src/mod/applications/mod_soundtouch/mod_soundtouch.cpp:62:41: error: template argument 1 is invalid /usr/local/src/freeswitch/src/mod/applications/mod_soundtouch/mod_soundtouch.cpp:62:55: error: expected unqualified-id before '=' token Do I need to use a specific namespace for the right and left arguments? Where are these defined? Or is something else wrong. Any help would be greatly appreciated. Thank you in advance. Regards, Jon

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Building Boost dynamically linkable gives linking error?
by Mehmet Emin Erük 06 Feb '14

06 Feb '14

I am trying to build boost and generate dll's but whatever I have done did not solve the problem. Here what I have got: Creating library bin.v2\libs\thread\build\msvc-11.0\dbg\adrs-mdl-32\async-excpt-on\thrd-mlt\boost_thread-vc110-mt-gd-1_53.lib and object bin.v2\libs\thread\build\msvc-11.0\dbg\adrs-mdl-32\async-excpt-on\thrd-mlt\boost_thread-vc110-mt-gd-1_53.exp thread.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall boost::gregorian::greg_month::greg_month(unsigned short)" (__imp_??0greg_month@gregorian@boost@@QAE@G@Z) referenced in function "public: __thiscall boost::gregorian::date::date(enum boost::date_time::special_values)" (??0date@gregorian@boost@@QAE@W4special_values@date_time@2@@Z) thread.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall boost::gregorian::greg_month::operator unsigned short(void)const " (__imp_??Bgreg_month@gregorian@boost@@QBEGXZ) referenced in function __catch$?make_external_thread_data@?A0x9b8c45f0@boost@@YAXXZ$0 bin.v2\libs\thread\build\msvc-11.0\dbg\adrs-mdl-32\async-excpt-on\thrd-mlt\boost_thread-vc110-mt-gd-1_53.dll : fatal error LNK1120: 2 unresolved externals Here some information about the setup: OS: W7 x64 Command to build: b2 -j%NUMBER_OF_PROCESSORS% --abbreviate-paths toolset=msvc-11.0 define=_SECURE_SCL=0 define=_CRT_SECURE_NO_DEPRECATE define=_CRT_SECURE_NO_WARNINGS --without-mpi address-model=32 variant=debug install link=shared runtime-link=shared threading=multi asynch-exceptions=on exception-handling=on extern-c-nothrow=off --prefix=..\boost cd .. I have CYGWin installed to the computer. *Here what I have tried till now;* *I have tried to build it in 32 bit command window (I am using jenkins to build boost) <tns:build tns:position='boost/boost_1_53_0' tns:command='C:\Windows\SysWOW64\cmd /C bootstrap.bat'/> <tns:build tns:position='boost/boost_1_53_0' tns:command='C:\Windows\SysWOW64\cmd /C build_boost-win32-debug-vs2012.cmd'/> *I wrote #define BOOST_ALL_DYN_LINK in the boost config/user.hpp *I wrote #define BOOST_ALL_NO_LIB in the boost config/user.hpp Is there anyone who experienced such a problem before? I really could not find anything in anywhere? -- bir gün herkes özgür olacak

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[Move, Container] returning a move-only type
by John M. Dlugosz 05 Feb '14

05 Feb '14

The definition of boost::container::vector includes: BOOST_COPYABLE_AND_MOVABLE rather than BOOST_MOVABLE_BUT_NOT_COPYABLE if the element type cannot be copied. If I have: typedef boost::container::vector<MyType> VecType; VecType foo() { ⋮ return boost::move(some_other_vec); } VecType x= foo(); On a configuration with BOOST_NO_RVALUE_REFERENCES defined, this gives an error within VecType's copy constructor, since MyType cannot be copied. If I write VecType x= boost::move(foo()); then I get an error that no matching move is viable, as the move(T&) wants an lvalue as the argument. I can't write the return type of foo to be rv<VecType> because that can't be copied (fake move-out like auto_pointer) either; the members are declared private and never defined. I'm thinking that if VecType were BOOST_MOVABLE_BUT_NOT_COPYABLE then it would work as expected, since operator rv<VecType>& would be provided. How can I make this work without surgery on the Boost headers, and hopefully without something ugly like deriving from vector and having to re-define and forward all the various constructors and such? —John

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[Range, Container] range of to-be-moved values ?
by John M. Dlugosz 05 Feb '14

05 Feb '14

Given a boost::container::vector<C> vec; I can write vec.push_back(move(value)) for a move-only (non-copyable) type C, instead of vec.push_back(value) as usual. But what would I write instead of vec.insert(pos,b,e) where (b,e] is a range of values? I'm particularly fond of Range concept, rather than loose iterators, so my function would be something that takes something that works as a Range; e.g. template <typename R> void prepend (const R& src_range) { auto b= boost::begin(src_range); auto e= boost::end(src_range); vec.insert(vec.begin(), b, e); } An rvalue reference to a range is not the same thing as a range of values that I may move from. I could have a differently named function and pass it a range with the implicit assumption that the function will modify the values, but is there a proper way to indicate that as part of the type? src_range can be, say, a pair of (non-const) iterator s as opposed to a pair of const_iterator s, or otherwise range_iterator<R>::type is dereferencable to a const value or not. But that itself is hard to see in general let alone overload against! If my function were called prepend_and_destroy_original(src) it might clue in the caller, but in general it is surprising that a parameter of (const R&) will modify the values. src itself doesn't change, and now refers to the same range of values which are now swapped out with defaults. With built-in pointers and even shared_ptr I can distinguish between an in-out parameter and a parameter that dereferences to a modifiable or const value. But what about with Ranges? Even with lower-case ranges provided by two iterators, How can you call something like boost::container::vector v2 (InIt_start, InIt_end); to convert a std::vector or some other container of move-only items? Only if the types match exactly can the vector(vector&&) constructor be used. —John

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[iostreams] Why does boost::iostreams::copy close the Sink & Source?
by Sebastian Karlsson 05 Feb '14

05 Feb '14

What's the rationale behind this decision? I don't find it intuitive and reduces the utility of the function. In my case I read from a file into a stream which I want to later use, the signature of the device is important. But as soon as I've copied my data over to the device it's destroyed and along side the data goes down the drain. Kind regards, Sebastian Karlsson

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Boost.MultiIndex. Using several keys together.
by syvyi 05 Feb '14

05 Feb '14

Hello, there's a structure struct person { std::string name; std::string surname; int birth_year; std::string craft; }; How to create such a multiindex container that dumping could performed using an index as name, surname and year triple alltogether? -- View this message in context: http://boost.2283326.n4.nabble.com/Boost-MultiIndex-Using-several-keys-toge… Sent from the Boost - Users mailing list archive at Nabble.com.

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boost::python wrapping a container of boost::variant?
by Mario Lang 05 Feb '14

05 Feb '14

Hi. Does anyone have ideas how to convince boost::python to wrap a container of boost::variant? I need this to generate useful python bindings for a project of mine which uses boost::variant internally. Since python supports heterogenous containers natively, it seems to me this should be doable. However, I have attempted to find a solution on my own on several occasions, and always failed. One obvious hint is the indexing_suite. However, now that I looked at it again, I think I know where the problem is: The get_item method of indexing_suite always returns a data_type object, which is value_type from the container in question. However, from what I can see, I'd need something that converts to boost::python::object, so that I can return whatever class is appropriate for the actual variant instance. In other words, get_item would need to return a boost::python::object instead of data_type. To illustrate in code what I want, here is a minimal example: #include <boost/python.hpp> #include <boost/variant.hpp> struct a { int x; }; struct b { double y; }; typedef boost::variant<a, b> variant; typedef std::vector<variant> vector; BOOST_PYTHON_MODULE(bpv) { using namespace boost::python; class_<a>("a", init<a>()) .def(init<>()) .def_readonly("x", &a::x); class_<b>("b", init<b>()) .def(init<>()) .def_readonly("y", &b::y); } The question is, how do I expose std::vector<variant> to Python? I guess I need to define a static_visitor that returns python objects, something like: struct to_python_visitor : boost::static_visitor<boost::python::object> { result_type operator()(a const &a_) const { // return a boost::python::object that refers to a_ } ... }; And hook that up to the container support somehow such that boost::apply_visitor(to_python_visitor(), variant_instance) is called whenever a value is retrieved from the container. Can this even be done with current Boost.Python? Any hints, maybe even concrete code examples, would be highly appreciated. -- CYa, ⡍⠁⠗⠊⠕

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boost::none for boost::shared_ptr
by Chris Stankevitz 03 Feb '14

03 Feb '14

Hello, Does boost::shared_ptr offer a way to create an empty shared pointer without a lot of typing? Perhaps something analogous to boost::none. I am not using c++11. Thank you, Chris == using boost::none; using boost::optional; // declare f(optional<CSomeReallyLongClassName> Item); g(shared_ptr<CSomeReallyLongClassName> pItem); // invoke f with empty object f(none); // invoke g with empty object g(shared_ptr<CSomeReallyLongClassName>());

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