- Boost-users - lists.boost.org

Re: [Boost-users] Dynamic function call question
by Alan M. Carroll 26 Feb '09

26 Feb '09

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accumulator taking a deduced argument - endless compilation time
by er 26 Feb '09

26 Feb '09

Hello, Comments are in the code. Any help appreciated. *.hpp template<typename RealType,typename Id> class mu : public accumulator_base { typedef mu<RealType,Id> self_type; typedef parameter::deduced<self_type> par0_type; typedef parameter::parameters<par0_type> params; public: typedef RealType result_type; mu(result_type value):value_(value){} template<typename Args> mu(const Args& args):value_((result_type)(0)){ // compile bottleneck (caused by the assigment, not the rhs) const self_type& input = params()(args); value_ = input.value_; } private: result_type value_; }; *cpp: typedef mpl::int_<0> id0_t; typedef accumulators::tag::mu<id0_t> mu0_t; typedef boost::mpl::vector< mu0_t > explicit_entities; typedef double value_type; typedef accumulators::accumulator_set< value_type, explicit_entities > acc_type; typedef mpl::apply<mu0_t::impl,value_type>::type input0_type; input0_type input0(0.5); // acc_type acc; // compiles fast acc_type acc((input0)); // compiles forever

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C_time.hpp fails to get a vaild time
by Lukas.Orlowski＠dlr.de 26 Feb '09

26 Feb '09

Dear Boost users I'm experiencing problem with the latest Boost version 1.3.8. When ever I try to get the current system time or do anything that needs the system time like: boost::xtime xt; boost::xtime_get(&xt, boost::TIME_UTC); The function c_time.hpp "static std::tm* gmtime(const std::time_t* t, std::tm* result) " Throws it's "could not convert calendar time to UTC time" exception. This might be thread specific but since xtime.hpp uses date_time functions I'm certain it is not. Version 1.3.6 does work fine. Am I missing some API changes? Regards Luke

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best way to remove duplicates from forwardIterator [startIter, endIter]
by Sandeep Gupta 26 Feb '09

26 Feb '09

Hi, Given a collection in terms of [startIter, endIter] how can obtain [uniqBeginIter, uniqEndIter] that represents unique elements of the original container. I can always explicitly instantiate a set S of [startIter, endIter] and use [S.begin(), S.end()]. Is it possible to express this in terms of algorithms. Please note that I won't be able to use std::sort as startIter does not conform to RandomAccessIterator. Its a forward iterator. Thanks Sandeep

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Boost.Test on Non Exported Dll Classes
by Jon Black 26 Feb '09

26 Feb '09

I have a bunch of dll projects that make up an application. I'd like to unit test these projects, but I have two problems: 1) The classes I'd like to test are in the dll and not all of them are exported; 2) Boost.Test doesn't have a main entry point, so if I solve 1 by packing my tests in the dll, how can I run them? If there is a better solution to 1, I'd love to hear it. Otherwise, how can I solve 2?

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[TR1] How to say BOOST_USE_BOOST_TR1
by Markus Werle 26 Feb '09

26 Feb '09

Hi! I'd like to #include <boost/tr1/*.hpp> while at the same time state that I am *not* interested in the compiler's TR1 implementation (vc9 ...) Any MACRO BOST_HAS_NO_TR1 I missed? The opposite (BOOST_HAS_TR1) exists. Markus

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Re: [Boost-users] Boost-users Digest, Vol 1918, Issue 3
by Stefan Funck 26 Feb '09

26 Feb '09

I'm not sure how that could work, since I want different access rights for the very same object? Stefan > Though I have not used it myself, there is enable_if or disable_if in BOOST. That might help. > > -dhruva > > > > ----- Original Message ---- >> From: Stefan Funck <stefanfunck(a)web.de> >> To: boost-users(a)lists.boost.org >> Sent: Thursday, 26 February, 2009 7:34:01 PM >> Subject: [Boost-users] make member functions (in)accessible >> >> Dear all, >> >> I'm trying to find some magic that makes a member function of some object x >> accessible if and only if it were called from within a class that has object x >> as a member. Is there a (boost)-way of doing this? >> >> As this may seem a bit obscure, I'm trying to give an example: >> >> template <typename T, bool Writable> >> class Property >> { >> public: >> T get() const; >> void set(const T& val); >> private: >> T m_val; >> }; >> is a simple class holding a value of T. >> >> I have some classes holding potentially many Properties. I'd like to have these >> properties publically available, some as only readable, others writable as well, >> so that others (e.g. gui-classes) can access them: >> >> class A >> { >> public: >> Property propA; >> Property propB; >> }; >> >> so I may do: >> >> A a; >> a.propA.get(); >> a.propA.set(0.5); >> a.propB.get(); >> >> but NOT: >> >> a.propB.set(1); >> >> because propB was defined with Writable=false. BUT, from within class A, I would >> like to do >> >> propB.set(1); >> >> because otherwise this property is useless. (How) can this be achieved (with >> boost)? >> >> I could make set() private in the Writable=false - specialisation of Property >> and declare A as a friend, but that's prohibitive since Property shouldn't know >> about A and it won't work for derived classes of A. Another option would be >> >> class A >> { >> public: >> A() : propA(propA_priv), propB(propB_priv) {} >> >> PropertyWrapper propA; >> PropertyWrapper propB; >> private: >> Property propA_priv; >> Property propB_priv; >> }; >> >> so the actual properties are private and the wrapper provides the actual >> interface to the outside world. But as there may be many properties I'd like to >> get away without the wrapper objects ... >> >> Thanks for any ideas! >> Stefan

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[archive]: Problem with creating a C-Interface DLL using Serialization/Archive
by von Arx, Martin 26 Feb '09

26 Feb '09

I'm writing a DLL which uses Boost for the Serialization (version 1.36.0). Because it has to maintain in different system I want to maintain a pure C-Interface DLL. As soon as I use the Boost-Library by activating the two lines boost::archive::text_iarchive ia(is); ia >> foo; in the function CNwDeSerialize_Test( ) it's C++ Interface becomes exposed in my C-Interface. Anybody got an idea why and what I can do to prevent it ? Regards Martin //===================================================== // Modul: stdafx.h #include <boost/archive/tmpdir.hpp> #include <boost/archive/text_iarchive.hpp> #include <boost/archive/text_oarchive.hpp> #include <boost/serialization/base_object.hpp> #include <boost/serialization/utility.hpp> #include <boost/serialization/list.hpp> #include <boost/serialization/assume_abstract.hpp> #include <boost/shared_ptr.hpp> //===================================================== // Modul: ChannelNwManager.h // ChannelNwManager.h : Defines the exported functions for the DLL application. // #ifdef __cplusplus extern "C" { #endif #ifdef CHANNELNWMANAGER_EXPORTS #define CHNNWMANAGER_API extern "C" __declspec(dllexport) #else #define CHNNWMANAGER_API extern "C" __declspec(dllimport) #endif CHNNWMANAGER_API void CNwDeSerialize_Test( void ); #ifdef __cplusplus } #endif //===================================================== // Modul: ChannelNwManager.cpp #include "stdafx.h" extern "C" __declspec(dllexport) void CNwDeSerialize_Test( ) { int foo; std::istringstream is("1"); // boost::archive::text_iarchive ia(is); // ia >> foo; } // ===================================================== // Modul: ChannelNwManager.cpp #include "stdafx.h" extern "C" __declspec(dllexport) void CNwDeSerialize_Test( ) { int foo; std::istringstream is("1"); boost::archive::text_iarchive ia(is); ia >> foo; }

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problems building with boost filesystem on Solaris 9
by Guy LaCrosse 26 Feb '09

26 Feb '09

here is my make file # Makefile for tpg5webapp CC=g++ CFLAGS = -static -m32 -fPIC -Wall BOOSTINC = -I/export/home/mlacrosse/boost/include/boost-1_38 STATIC_LIB_OPT = -Wl,"-Bstatic" LINK_OPTS = -v -fident -Wl,"-Bdirect" -Wl,"-m" -z defs -z rescan BOOST_LIBPATH = -L/export/home/mlacrosse/boost/lib/ -lboost_filesystem-gcc34-mt -lboost_system-gcc34-mt BOOST_LIBS = $(STATIC_LIB_OPT) $(BOOST_LIBPATH) TNLIBS = -L/export/home/jshelly/work/tserve4/lib TNINCLUDE = -I/export/home/jshelly/work/tserve4/pub/include BASE_LIBS= -L/usr/local/lib LOCALLIB = -L/export/home/mlacrosse/work/gccroot/usr/local/lib INCLUDES = -I. -I./h $(BOOSTINC) $(TNINCLUDE) LIBS = $(BOOST_LIBS) $(TNLIBS) $(BASE_LIBS) $(LOCALLIBS) DEFINES = -D__SOLARIS__ -DBSD_COMP -DSTRICT_PROTO -DSSBIGENDIAN all: tpg5webapp tpg5webapp: tpg5webapp.cpp ConfigFile.cpp $(CC) $(CFLAGS) $(DEFINES) $(INCLUDES) $(LIBS) \ -o tpg5webapp ConfigFile.cpp tpg5webapp.cpp run: tpg5webapp ./tpg5webapp | tee tpg5webapp.out tidy: @ rm -f *.o clean: tidy @ rm -f tpg5webapp tpg5webapp.out core* here are the error message that I'm getting Undefined first referenced symbol in file boost::filesystem::detail::dir_itr_first(void*&, void*&, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&, boost::filesystem::file_status&, boost::filesys tem::file_status&)/var/tmp//ccOQOOR8.o boost::system::get_generic_category() /var/tmp//ccOQOOR8.o boost::filesystem::detail::dir_itr_increment(void*&, void*&, std::basic_string<char, std::char_traits<char>, std::allocator<char > >&, boost::filesystem::file_status&, boost::filesystem::file_status&)/var/tmp//ccOQOOR8.o boost::system::get_system_category() /var/tmp//ccOQOOR8.o boost::filesystem::detail::not_found_error() /var/tmp//ccOQOOR8.o boost::filesystem::detail::symlink_status_api(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, boo st::system::error_code&)/var/tmp//ccOQOOR8.o boost::filesystem::detail::remove_api(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)/var/tmp//cc OQOOR8.o boost::filesystem::detail::create_directory_api(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)/v ar/tmp//ccOQOOR8.o boost::filesystem::detail::dir_itr_close(void*&, void*&)/var/tmp//ccOQOOR8.o boost::filesystem::detail::copy_file_api(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::bas ic_string<char, std::char_traits<char>, std::allocator<char> > const&)/var/tmp//ccOQOOR8.o boost::filesystem::detail::status_api(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, boost::syst em::error_code&)/var/tmp//ccOQOOR8.o boost::filesystem::detail::get_current_path_api(std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)/var/tmp //ccOQOOR8.o ld: fatal: Symbol referencing errors. No output written to tpg5webapp collect2: ld returned 1 exit status make: *** [tpg5webapp] Error 1

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Some questions about cross-compiling boost
by 磊周 26 Feb '09

26 Feb '09

Hi,everyone. The version of boost I used is 1.38. I have tried to cross-compile the boost library for a platform with ARM and Linux, but I failed. What I did is listed following: #cd mypath/boost_1_38_0/tools/jam/src #./build/build.sh By doing these, I got a executable file named bjam in the folder "bin.linuxx86". I copied the bjam to the directory "mypath/boost_1_38_0/", then : #cd mypath/boost_1_38_0 #./bjam "-sGCC_ROOT_DIRECTORY=/opt/mv_pro_4.0/montavista/pro/devkit/arm/v5t_le" "-sGCC=arm_v5t_le-gcc" "-sGXX=arm_v5t_le-g++" "-sGCC_BIN_DIRECTORY=/opt/mv_pro_4.0/montavista/pro/devkit/arm/v5t_le/bin" finally, there were some libraries gengerated in "usr/local/lib". Unfortunately, these libraries just can be used in the X86 platform but not ARM platform. Maybe my method was incorrect. Could anyone give me some advices to deal with my problem? Thanks! Best wishes Zou ___________________________________________________________ 好玩贺卡等你发，邮箱贺卡全新上线！ http://card.mail.cn.yahoo.com/

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