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Re: [Boost-users] [serialization] Works when statically linked but not as a DLL using VS2012 on Win7 64bit [Honeywell Internal]
by Hickman, Steve (AdvTech) 22 May '14

22 May '14

Classification: Honeywell Internal I'm using Boost 1.55 --- Steve H. ============================================================================================================================================================================================================ This message classified as Honeywell Internal by Hickman, Steve (AdvTech) on Thursday, May 22, 2014 at 11:01:53 AM. The above classification labels are in accordance with the Honeywell Corporate Classification Policy. The information contained in this electronic message is confidential and intended only for the use of the individual/entity named above, and the information may be privileged. If you, the reader of this message, are not the intended recipient or an employee or agent responsible to deliver this message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please immediately notify the sender and delete the original message. ============================================================================================================================================================================================================ From: Hickman, Steve (AdvTech) Sent: Thursday, May 22, 2014 10:56 AM To: 'boost-users(a)lists.boost.org' Subject: [serialization] Works when statically linked but not as a DLL using VS2012 on Win7 64bit [Honeywell Internal] Classification: Honeywell Internal I'm using Boost.Serialization on a 64 bit Win7 machine using VS 2012. I have instances from a class hierarchy that I'm serializing through a base class pointer. I'm building a 32 bit debug console application. I'm serializing to an input text archive then extracting the stringstream and deserializing via an output text archive. When I build the library containing the class hierarchy as a static library, I can serialize and deserialize consistently instances of any of the classes in the hierarchy multiple times. When I build the same library as a DLL, serialization/ deserialization works for some of the classes but fails consistently when deserializing one of the derived classes. I've checked the following things: 1) All of the data fields of the instances are initialized. They are fundamental types (bool, int, long), std::string, a std::chrono (which has a serialization I found on the 'Net) and one enumerated type (removing the enumerated type doesn't fix the problem). 2) The serialize code is in the .cpp files (not headers) along with the instantiations for the archive I use so I don't have multiple instantiations of the serialize methods 3) The test driver does nothing but run the tests - so the DLL containing the library shouldn't be loaded multiple times. 4) The output archive is closed before I open the input archive, so there shouldn't be characters missing at the end of the stringstream. 5) I'm building UNICODE for both the library and the test driver, so character size shouldn't be changing. I know is that the Microsoft compiler does create an executable that will execute static code that is not reachable via main. I have not (to my knowledge) included static code that is unreachable via main, but I haven't delved into the Serialization EXPORT macros to see what exactly they are doing. I don't know if that is a source of the problem. When I build the library, I do get linker warnings (see examples at bottom) that I'm importing locally defined symbols. Since all of the classes in the library must be visible externally because they are used externally, they must all be exported. Since they are part of a class hierarchy, they must be available to the other classes in the library that derive from them. I don't know if these warnings point to the problem. I also don't know how to get rid of them given the above. My question is: Why is this happening? How do I fix it? Other notes: all of the library classes have "DECL" macros that resolve to __declspec(dllexport) or __declspec(dllimport) when building the dll. When I build the static library, these resolve to "" (nothing). I'm attaching copies of relevant files. All files named "Raw*Event" are part of the library. MinimalTest.cpp is the test driver. Chrono.hpp is the serialization header that is not part of the Boost serialization library. Compiler flags for the library when building it as a DLL: (C/C++): /GS /analyze- /W3 /wd"4996" /Zc:wchar_t /I"C:\GITRepos\fd_x\source" /I"C:\GITRepos\fd_x\lib\boost-aux" /I"c:\GITRepos\fd_x\lib\boost_1_55_0\\" /I"C:\GITRepos\TRACS\inc" /ZI /Gm /Od /sdl /Fd"Win32\Debug\vc110.pdb" /fp:precise /D "_WINDLL" /D "_UNICODE" /D "UNICODE" /errorReport:prompt /doc"Win32\Debug\" /WX- /Zc:forScope /RTC1 /Gd /Oy- /MDd /Fa"Win32\Debug\" /EHsc /nologo /Fo"Win32\Debug\" /Fp"Win32\Debug\Input.pch" (Linker) /OUT:"C:\GITRepos\fd_x\build\Win32\Debug\Input.dll" /MANIFEST /NXCOMPAT /PDB:"C:\GITRepos\fd_x\build\Win32\Debug\Input.pdb" /DYNAMICBASE "kernel32.lib" "user32.lib" "gdi32.lib" "winspool.lib" "comdlg32.lib" "advapi32.lib" "shell32.lib" "ole32.lib" "oleaut32.lib" "uuid.lib" "odbc32.lib" "odbccp32.lib" /IMPLIB:"C:\GITRepos\fd_x\build\Win32\Debug\Input.lib" /DEBUG /DLL /MACHINE:X86 /INCREMENTAL /PGD:"C:\GITRepos\fd_x\build\Win32\Debug\Input.pgd" /MANIFESTUAC:"level='asInvoker' uiAccess='false'" /ManifestFile:"Win32\Debug\Input.dll.intermediate.manifest" /ERRORREPORT:PROMPT /NOLOGO /LIBPATH:"C:\GITRepos\fd_x\build\Debug\" /LIBPATH:"c:\GITRepos\fd_x\lib\TRACS" /LIBPATH:"c:\Boost\v1.55\lib-VS2012" /TLBID:1 Compiler flags for the test driver when linking the DLL: (C/C++) /GS /analyze- /W3 /Zc:wchar_t /I"C:\GITRepos\fd_x\source" /I"c:\GITRepos\fd_x\lib\boost_1_55_0\" /I"C:\GITRepos\fd_x\lib\boost-aux" /I"C:\GITRepos\TRACS\inc" /ZI /Gm /Od /sdl /Fd"Win32\Debug\vc110.pdb" /fp:precise /D "WIN32" /D "_DEBUG" /D "_CONSOLE" /D "_UNICODE" /D "UNICODE" /errorReport:prompt /WX- /Zc:forScope /RTC1 /GR /Gd /Oy- /MDd /Fa"Win32\Debug\" /EHsc /nologo /Fo"Win32\Debug\" /Fp"Win32\Debug\InputTest-Win32.pch" (Linker) /OUT:"C:\GITRepos\fd_x\build\Win32\Debug\InputTest-Win32.exe" /MANIFEST /NXCOMPAT /PDB:"C:\GITRepos\fd_x\build\Win32\Debug\InputTest-Win32.pdb" /DYNAMICBASE "Input.lib" "Utilities.lib" "calsim_d.lib" "kernel32.lib" "user32.lib" "gdi32.lib" "winspool.lib" "comdlg32.lib" "advapi32.lib" "shell32.lib" "ole32.lib" "oleaut32.lib" "uuid.lib" "odbc32.lib" "odbccp32.lib" /DEBUG /MACHINE:X86 /INCREMENTAL /PGD:"C:\GITRepos\fd_x\build\Win32\Debug\InputTest-Win32.pgd" /SUBSYSTEM:CONSOLE /MANIFESTUAC:"level='asInvoker' uiAccess='false'" /ManifestFile:"Win32\Debug\InputTest-Win32.exe.intermediate.manifest" /ERRORREPORT:PROMPT /NOLOGO /LIBPATH:"C:\GITRepos\fd_x\build\Win32\Debug\" /LIBPATH:"c:\Boost\v1.55\lib-VS2012" /LIBPATH:"C:\GITRepos\TRACS\\lib" /TLBID:1 Compiler flags for the library when building it as a static library: (C++) /GS /analyze- /W3 /wd"4996" /Zc:wchar_t /I"C:\GITRepos\fd_x\source" /I"C:\GITRepos\fd_x\lib\boost-aux" /I"c:\GITRepos\fd_x\lib\boost_1_55_0\\" /I"C:\GITRepos\TRACS\inc" /ZI /Gm /Od /sdl /Fd"Win32\Debug\vc110.pdb" /fp:precise /D "_UNICODE" /D "UNICODE" /errorReport:prompt /doc"Win32\Debug\" /WX- /Zc:forScope /RTC1 /Gd /Oy- /MDd /Fa"Win32\Debug\" /EHsc /nologo /Fo"Win32\Debug\" /Fp"Win32\Debug\Input.pch" (Librarian) /OUT:"C:\GITRepos\fd_x\build\Win32\Debug\Input.lib" /NOLOGO /LIBPATH:"C:\GITRepos\fd_x\build\Win32\Debug\" Compiler flags for the test driver when linking the static library: (C++) /GS /analyze- /W3 /Zc:wchar_t /I"C:\GITRepos\fd_x\source" /I"c:\GITRepos\fd_x\lib\boost_1_55_0\" /I"C:\GITRepos\fd_x\lib\boost-aux" /I"C:\GITRepos\TRACS\inc" /ZI /Gm /Od /sdl /Fd"Win32\Debug\vc110.pdb" /fp:precise /D "WIN32" /D "_DEBUG" /D "_CONSOLE" /D "_UNICODE" /D "UNICODE" /errorReport:prompt /WX- /Zc:forScope /RTC1 /GR /Gd /Oy- /MDd /Fa"Win32\Debug\" /EHsc /nologo /Fo"Win32\Debug\" /Fp"Win32\Debug\InputTest-Win32.pch" (Linker) /OUT:"C:\GITRepos\fd_x\build\Win32\Debug\InputTest-Win32.exe" /MANIFEST /NXCOMPAT /PDB:"C:\GITRepos\fd_x\build\Win32\Debug\InputTest-Win32.pdb" /DYNAMICBASE "Input.lib" "Utilities.lib" "calsim_d.lib" "kernel32.lib" "user32.lib" "gdi32.lib" "winspool.lib" "comdlg32.lib" "advapi32.lib" "shell32.lib" "ole32.lib" "oleaut32.lib" "uuid.lib" "odbc32.lib" "odbccp32.lib" /DEBUG /MACHINE:X86 /INCREMENTAL /PGD:"C:\GITRepos\fd_x\build\Win32\Debug\InputTest-Win32.pgd" /SUBSYSTEM:CONSOLE /MANIFESTUAC:"level='asInvoker' uiAccess='false'" /ManifestFile:"Win32\Debug\InputTest-Win32.exe.intermediate.manifest" /ERRORREPORT:PROMPT /NOLOGO /LIBPATH:"C:\GITRepos\fd_x\build\Win32\Debug\" /LIBPATH:"c:\Boost\v1.55\lib-VS2012" /LIBPATH:"C:\GITRepos\TRACS\\lib" /TLBID:1 Example link warnings when building the DLL: 1>RawUIEvent.obj : warning LNK4217: locally defined symbol ??$serialize@Vbinary_iarchive@archive@boost@@@RawEvent@Input@@IAEXAAVbinary_iarchive@archive@boost@@I@Z (protected: void __thiscall Input::RawEvent::serialize<class boost::archive::binary_iarchive>(class boost::archive::binary_iarchive &,unsigned int)) imported in function "public: static void __cdecl boost::serialization::access::serialize<class boost::archive::binary_iarchive,class Input::RawEvent>(class boost::archive::binary_iarchive &,class Input::RawEvent &,unsigned int)" (??$serialize@Vbinary_iarchive@archive@boost@@VRawEvent@Input@@@access@serialization@boost@@SAXAAVbinary_iarchive@archive@2@AAVRawEvent@Input@@I@Z) 1>RawUIEvent.obj : warning LNK4217: locally defined symbol ??$serialize@Vbinary_oarchive@archive@boost@@@RawEvent@Input@@IAEXAAVbinary_oarchive@archive@boost@@I@Z (protected: void __thiscall Input::RawEvent::serialize<class boost::archive::binary_oarchive>(class boost::archive::binary_oarchive &,unsigned int)) imported in function "public: static void __cdecl boost::serialization::access::serialize<class boost::archive::binary_oarchive,class Input::RawEvent>(class boost::archive::binary_oarchive &,class Input::RawEvent &,unsigned int)" (??$serialize@Vbinary_oarchive@archive@boost@@VRawEvent@Input@@@access@serialization@boost@@SAXAAVbinary_oarchive@archive@2@AAVRawEvent@Input@@I@Z) 1> Input.vcxproj -> C:\GITRepos\fd_x\build\Win32\Debug\Input.dll Steve Hickman 480-236-8367 ============================================================================================================================================================================================================ This message classified as Honeywell Internal by Hickman, Steve (AdvTech) on Thursday, May 22, 2014 at 10:56:21 AM. The above classification labels are in accordance with the Honeywell Corporate Classification Policy. The information contained in this electronic message is confidential and intended only for the use of the individual/entity named above, and the information may be privileged. If you, the reader of this message, are not the intended recipient or an employee or agent responsible to deliver this message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please immediately notify the sender and delete the original message. ============================================================================================================================================================================================================

1 0

[serialization] Works when statically linked but not as a DLL using VS2012 on Win7 64bit [Honeywell Internal]
by Hickman, Steve (AdvTech) 22 May '14

22 May '14

Classification: Honeywell Internal I'm using Boost.Serialization on a 64 bit Win7 machine using VS 2012. I have instances from a class hierarchy that I'm serializing through a base class pointer. I'm building a 32 bit debug console application. I'm serializing to an input text archive then extracting the stringstream and deserializing via an output text archive. When I build the library containing the class hierarchy as a static library, I can serialize and deserialize consistently instances of any of the classes in the hierarchy multiple times. When I build the same library as a DLL, serialization/ deserialization works for some of the classes but fails consistently when deserializing one of the derived classes. I've checked the following things: 1) All of the data fields of the instances are initialized. They are fundamental types (bool, int, long), std::string, a std::chrono (which has a serialization I found on the 'Net) and one enumerated type (removing the enumerated type doesn't fix the problem). 2) The serialize code is in the .cpp files (not headers) along with the instantiations for the archive I use so I don't have multiple instantiations of the serialize methods 3) The test driver does nothing but run the tests - so the DLL containing the library shouldn't be loaded multiple times. 4) The output archive is closed before I open the input archive, so there shouldn't be characters missing at the end of the stringstream. 5) I'm building UNICODE for both the library and the test driver, so character size shouldn't be changing. I know is that the Microsoft compiler does create an executable that will execute static code that is not reachable via main. I have not (to my knowledge) included static code that is unreachable via main, but I haven't delved into the Serialization EXPORT macros to see what exactly they are doing. I don't know if that is a source of the problem. When I build the library, I do get linker warnings (see examples at bottom) that I'm importing locally defined symbols. Since all of the classes in the library must be visible externally because they are used externally, they must all be exported. Since they are part of a class hierarchy, they must be available to the other classes in the library that derive from them. I don't know if these warnings point to the problem. I also don't know how to get rid of them given the above. My question is: Why is this happening? How do I fix it? Other notes: all of the library classes have "DECL" macros that resolve to __declspec(dllexport) or __declspec(dllimport) when building the dll. When I build the static library, these resolve to "" (nothing). I'm attaching copies of relevant files. All files named "Raw*Event" are part of the library. MinimalTest.cpp is the test driver. Chrono.hpp is the serialization header that is not part of the Boost serialization library. Compiler flags for the library when building it as a DLL: (C/C++): /GS /analyze- /W3 /wd"4996" /Zc:wchar_t /I"C:\GITRepos\fd_x\source" /I"C:\GITRepos\fd_x\lib\boost-aux" /I"c:\GITRepos\fd_x\lib\boost_1_55_0\\" /I"C:\GITRepos\TRACS\inc" /ZI /Gm /Od /sdl /Fd"Win32\Debug\vc110.pdb" /fp:precise /D "_WINDLL" /D "_UNICODE" /D "UNICODE" /errorReport:prompt /doc"Win32\Debug\" /WX- /Zc:forScope /RTC1 /Gd /Oy- /MDd /Fa"Win32\Debug\" /EHsc /nologo /Fo"Win32\Debug\" /Fp"Win32\Debug\Input.pch" (Linker) /OUT:"C:\GITRepos\fd_x\build\Win32\Debug\Input.dll" /MANIFEST /NXCOMPAT /PDB:"C:\GITRepos\fd_x\build\Win32\Debug\Input.pdb" /DYNAMICBASE "kernel32.lib" "user32.lib" "gdi32.lib" "winspool.lib" "comdlg32.lib" "advapi32.lib" "shell32.lib" "ole32.lib" "oleaut32.lib" "uuid.lib" "odbc32.lib" "odbccp32.lib" /IMPLIB:"C:\GITRepos\fd_x\build\Win32\Debug\Input.lib" /DEBUG /DLL /MACHINE:X86 /INCREMENTAL /PGD:"C:\GITRepos\fd_x\build\Win32\Debug\Input.pgd" /MANIFESTUAC:"level='asInvoker' uiAccess='false'" /ManifestFile:"Win32\Debug\Input.dll.intermediate.manifest" /ERRORREPORT:PROMPT /NOLOGO /LIBPATH:"C:\GITRepos\fd_x\build\Debug\" /LIBPATH:"c:\GITRepos\fd_x\lib\TRACS" /LIBPATH:"c:\Boost\v1.55\lib-VS2012" /TLBID:1 Compiler flags for the test driver when linking the DLL: (C/C++) /GS /analyze- /W3 /Zc:wchar_t /I"C:\GITRepos\fd_x\source" /I"c:\GITRepos\fd_x\lib\boost_1_55_0\" /I"C:\GITRepos\fd_x\lib\boost-aux" /I"C:\GITRepos\TRACS\inc" /ZI /Gm /Od /sdl /Fd"Win32\Debug\vc110.pdb" /fp:precise /D "WIN32" /D "_DEBUG" /D "_CONSOLE" /D "_UNICODE" /D "UNICODE" /errorReport:prompt /WX- /Zc:forScope /RTC1 /GR /Gd /Oy- /MDd /Fa"Win32\Debug\" /EHsc /nologo /Fo"Win32\Debug\" /Fp"Win32\Debug\InputTest-Win32.pch" (Linker) /OUT:"C:\GITRepos\fd_x\build\Win32\Debug\InputTest-Win32.exe" /MANIFEST /NXCOMPAT /PDB:"C:\GITRepos\fd_x\build\Win32\Debug\InputTest-Win32.pdb" /DYNAMICBASE "Input.lib" "Utilities.lib" "calsim_d.lib" "kernel32.lib" "user32.lib" "gdi32.lib" "winspool.lib" "comdlg32.lib" "advapi32.lib" "shell32.lib" "ole32.lib" "oleaut32.lib" "uuid.lib" "odbc32.lib" "odbccp32.lib" /DEBUG /MACHINE:X86 /INCREMENTAL /PGD:"C:\GITRepos\fd_x\build\Win32\Debug\InputTest-Win32.pgd" /SUBSYSTEM:CONSOLE /MANIFESTUAC:"level='asInvoker' uiAccess='false'" /ManifestFile:"Win32\Debug\InputTest-Win32.exe.intermediate.manifest" /ERRORREPORT:PROMPT /NOLOGO /LIBPATH:"C:\GITRepos\fd_x\build\Win32\Debug\" /LIBPATH:"c:\Boost\v1.55\lib-VS2012" /LIBPATH:"C:\GITRepos\TRACS\\lib" /TLBID:1 Compiler flags for the library when building it as a static library: (C++) /GS /analyze- /W3 /wd"4996" /Zc:wchar_t /I"C:\GITRepos\fd_x\source" /I"C:\GITRepos\fd_x\lib\boost-aux" /I"c:\GITRepos\fd_x\lib\boost_1_55_0\\" /I"C:\GITRepos\TRACS\inc" /ZI /Gm /Od /sdl /Fd"Win32\Debug\vc110.pdb" /fp:precise /D "_UNICODE" /D "UNICODE" /errorReport:prompt /doc"Win32\Debug\" /WX- /Zc:forScope /RTC1 /Gd /Oy- /MDd /Fa"Win32\Debug\" /EHsc /nologo /Fo"Win32\Debug\" /Fp"Win32\Debug\Input.pch" (Librarian) /OUT:"C:\GITRepos\fd_x\build\Win32\Debug\Input.lib" /NOLOGO /LIBPATH:"C:\GITRepos\fd_x\build\Win32\Debug\" Compiler flags for the test driver when linking the static library: (C++) /GS /analyze- /W3 /Zc:wchar_t /I"C:\GITRepos\fd_x\source" /I"c:\GITRepos\fd_x\lib\boost_1_55_0\" /I"C:\GITRepos\fd_x\lib\boost-aux" /I"C:\GITRepos\TRACS\inc" /ZI /Gm /Od /sdl /Fd"Win32\Debug\vc110.pdb" /fp:precise /D "WIN32" /D "_DEBUG" /D "_CONSOLE" /D "_UNICODE" /D "UNICODE" /errorReport:prompt /WX- /Zc:forScope /RTC1 /GR /Gd /Oy- /MDd /Fa"Win32\Debug\" /EHsc /nologo /Fo"Win32\Debug\" /Fp"Win32\Debug\InputTest-Win32.pch" (Linker) /OUT:"C:\GITRepos\fd_x\build\Win32\Debug\InputTest-Win32.exe" /MANIFEST /NXCOMPAT /PDB:"C:\GITRepos\fd_x\build\Win32\Debug\InputTest-Win32.pdb" /DYNAMICBASE "Input.lib" "Utilities.lib" "calsim_d.lib" "kernel32.lib" "user32.lib" "gdi32.lib" "winspool.lib" "comdlg32.lib" "advapi32.lib" "shell32.lib" "ole32.lib" "oleaut32.lib" "uuid.lib" "odbc32.lib" "odbccp32.lib" /DEBUG /MACHINE:X86 /INCREMENTAL /PGD:"C:\GITRepos\fd_x\build\Win32\Debug\InputTest-Win32.pgd" /SUBSYSTEM:CONSOLE /MANIFESTUAC:"level='asInvoker' uiAccess='false'" /ManifestFile:"Win32\Debug\InputTest-Win32.exe.intermediate.manifest" /ERRORREPORT:PROMPT /NOLOGO /LIBPATH:"C:\GITRepos\fd_x\build\Win32\Debug\" /LIBPATH:"c:\Boost\v1.55\lib-VS2012" /LIBPATH:"C:\GITRepos\TRACS\\lib" /TLBID:1 Example link warnings when building the DLL: 1>RawUIEvent.obj : warning LNK4217: locally defined symbol ??$serialize@Vbinary_iarchive@archive@boost@@@RawEvent@Input@@IAEXAAVbinary_iarchive@archive@boost@@I@Z (protected: void __thiscall Input::RawEvent::serialize<class boost::archive::binary_iarchive>(class boost::archive::binary_iarchive &,unsigned int)) imported in function "public: static void __cdecl boost::serialization::access::serialize<class boost::archive::binary_iarchive,class Input::RawEvent>(class boost::archive::binary_iarchive &,class Input::RawEvent &,unsigned int)" (??$serialize@Vbinary_iarchive@archive@boost@@VRawEvent@Input@@@access@serialization@boost@@SAXAAVbinary_iarchive@archive@2@AAVRawEvent@Input@@I@Z) 1>RawUIEvent.obj : warning LNK4217: locally defined symbol ??$serialize@Vbinary_oarchive@archive@boost@@@RawEvent@Input@@IAEXAAVbinary_oarchive@archive@boost@@I@Z (protected: void __thiscall Input::RawEvent::serialize<class boost::archive::binary_oarchive>(class boost::archive::binary_oarchive &,unsigned int)) imported in function "public: static void __cdecl boost::serialization::access::serialize<class boost::archive::binary_oarchive,class Input::RawEvent>(class boost::archive::binary_oarchive &,class Input::RawEvent &,unsigned int)" (??$serialize@Vbinary_oarchive@archive@boost@@VRawEvent@Input@@@access@serialization@boost@@SAXAAVbinary_oarchive@archive@2@AAVRawEvent@Input@@I@Z) 1> Input.vcxproj -> C:\GITRepos\fd_x\build\Win32\Debug\Input.dll Steve Hickman 480-236-8367 ============================================================================================================================================================================================================ This message classified as Honeywell Internal by Hickman, Steve (AdvTech) on Thursday, May 22, 2014 at 10:56:21 AM. The above classification labels are in accordance with the Honeywell Corporate Classification Policy. The information contained in this electronic message is confidential and intended only for the use of the individual/entity named above, and the information may be privileged. If you, the reader of this message, are not the intended recipient or an employee or agent responsible to deliver this message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please immediately notify the sender and delete the original message. ============================================================================================================================================================================================================

1 0

boost::throw_exception(...) behaviour and use case
by Arindam Mukherjee 22 May '14

22 May '14

I was wondering what behaviour or idiom does boost::throw_exception enable. I must be dense but the documentation here (http://www.boost.org/doc/libs/1_55_0/libs/exception/doc/throw_exception.html) does not immediately ring a bell. Is it meant to somehow help write code that runs both in environments where exceptions are enabled and where they are not? Since the structure of code that does not use exception handling tends to be quite different from that which does, I was wondering what's a correct idiomatic use of Boost. Of course I am aware that my basic assumption might be incorrect. Thanks, Arindam

2 1

[units] Problem with conversion of compound units
by Norman, Ben 22 May '14

22 May '14

First, thanks for the most excellent boost::units library. We are making good use of it in a scientific software project. I confess that there more than a few things that remain mysterious to me, but I'll focus on one example here: ---------------------------------------------------------------- #include <iostream> #include <boost/units/make_scaled_unit.hpp> #include <boost/units/systems/si.hpp> using namespace std; using namespace boost::units; /** @brief electron volts */ struct ev_base_unit : public base_unit<ev_base_unit, energy_dimension, 9999>{ /** @brief Get the unit name */ static const char* name() { return "electron-Volt"; } /** @brief Get the unit symbol */ static const char* symbol() { return "eV"; } }; typedef ev_base_unit::unit_type ev_unit; BOOST_UNITS_STATIC_CONSTANT(eV, ev_unit); // keV typedef make_scaled_unit<ev_unit, scale<10, static_rational<3> > >::type kev_unit; BOOST_UNITS_STATIC_CONSTANT(keV, kev_unit); // can only define conversion from a base unit. BOOST_UNITS_DEFINE_CONVERSION_FACTOR(ev_base_unit, si::energy, double, 1.60217653e-19); // without this, conversion from si::energy to eV doesn't work BOOST_UNITS_DEFAULT_CONVERSION(ev_base_unit, si::energy); int main(int argc, char **argv){ // "natural" direction (ev -> joule) cerr << "conversion ev to joule: " << conversion_factor(eV, si::joule) << endl; cerr << "conversion kev/s to joule/s: " << conversion_factor(keV/si::second, si::joule/si::second) << endl; // "reverse" direction (joule -> ev) cerr << "conversion joule to ev: " << conversion_factor(si::joule, eV) << endl; cerr << "conversion from joule/s to kev/s: " << conversion_factor(si::joule/si::second, keV/si::second) << endl; // eV to keV conversions cerr << "conversion ev to kev: " << conversion_factor(eV, keV) << endl; cerr << "conversion ev/s to kev/s: " // Fails to compile: << conversion_factor(eV/si::second, keV/si::second) << endl; return 0; } ---------------------------------------------------------------- When compiling the program above with gcc 4.8.2 and boost 1.54, I get the error below. All the conversions for eV and keV to and from joules work fine (even when divided by time as a test), but going between eV/second and keV/second explodes. Is this a limitation of make_scaled_unit? I have also tried with scaled_base_unit, but the results are the same. Thanks for any help, Ben In file included from /usr/include/boost/units/heterogeneous_system.hpp:39:0, from /usr/include/boost/units/make_scaled_unit.hpp:15, from test.cpp:3: /usr/include/boost/units/detail/linear_algebra.hpp: In instantiation of ‘struct boost::units::detail::determine_extra_equations_skip_zeros_impl<true, false>::apply<boost::units::list<boost::units::list<boost::units::static_rational<0l, 1l>, boost::units::list<boost::units::static_rational<1l>, boost::units::dimensionless_type> >, boost::units::dimensionless_type>, 1, 1, 3, boost::units::list<boost::units::list<boost::units::static_rational<0l, 1l>, boost::units::list<boost::units::static_rational<0l, 1l>, boost::units::list<boost::units::static_rational<1l>, boost::units::dimensionless_type> > >, boost::units::list<boost::units::list<boost::units::static_rational<2l>, boost::units::list<boost::units::static_rational<1l>, boost::units::list<boost::units::static_rational<-2l>, boost::units::dimensionless_type> > >, boost::units::dimensionless_type> > >’: /usr/include/boost/units/detail/linear_algebra.hpp:259:54: required from ‘struct boost::units::detail::determine_extra_equations<2, false>::apply<boost::units::list<boost::units::list<boost::units::static_rational<0l, 1l>, boost::units::list<boost::units::static_rational<1l>, boost::units::dimensionless_type> >, boost::units::dimensionless_type>, 3, boost::units::list<boost::units::list<boost::units::static_rational<0l, 1l>, boost::units::list<boost::units::static_rational<0l, 1l>, boost::units::list<boost::units::static_rational<1l>, boost::units::dimensionless_type> > >, boost::units::list<boost::units::list<boost::units::static_rational<2l>, boost::units::list<boost::units::static_rational<1l>, boost::units::list<boost::units::static_rational<-2l>, boost::units::dimensionless_type> > >, boost::units::dimensionless_type> > >’ /usr/include/boost/units/detail/linear_algebra.hpp:264:17: required from ‘struct boost::units::detail::determine_extra_equations<3, false>::apply<boost::units::list<boost::units::list<boost::units::static_rational<0l, 1l>, boost::units::list<boost::units::static_rational<0l, 1l>, boost::units::list<boost::units::static_rational<1l>, boost::units::dimensionless_type> > >, boost::units::list<boost::units::list<boost::units::static_rational<2l>, boost::units::list<boost::units::static_rational<1l>, boost::units::list<boost::units::static_rational<-2l>, boost::units::dimensionless_type> > >, boost::units::dimensionless_type> >, 3, boost::units::list<boost::units::list<boost::units::static_rational<0l, 1l>, boost::units::list<boost::units::static_rational<0l, 1l>, boost::units::list<boost::units::static_rational<1l>, boost::units::dimensionless_type> > >, boost::units::list<boost::units::list<boost::units::static_rational<2l>, boost::units::list<boost::units::static_rational<1l>, boost::units::list<boost::units::static_rational<-2l>, boost::units::dimensionless_type> > >, boost::units::dimensionless_type> > >’ /usr/include/boost/units/detail/linear_algebra.hpp:538:13: required from ‘struct boost::units::detail::make_square_and_invert<boost::units::list<boost::units::list<boost::units::static_rational<0l, 1l>, boost::units::list<boost::units::static_rational<0l, 1l>, boost::units::list<boost::units::static_rational<1l>, boost::units::dimensionless_type> > >, boost::units::list<boost::units::list<boost::units::static_rational<2l>, boost::units::list<boost::units::static_rational<1l>, boost::units::list<boost::units::static_rational<-2l>, boost::units::dimensionless_type> > >, boost::units::dimensionless_type> > >’ /usr/include/boost/units/detail/linear_algebra.hpp:828:59: required from ‘struct boost::units::detail::normalize_units<boost::units::list<boost::units::si::second_base_unit, boost::units::list<ev_base_unit, boost::units::dimensionless_type> > >’ /usr/include/boost/units/detail/linear_algebra.hpp:1035:17: [ skipping 2 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ] /usr/include/boost/units/heterogeneous_system.hpp:243:93: required from ‘struct boost::units::detail::make_heterogeneous_system<boost::units::list<boost::units::dim<boost::units::time_base_dimension, boost::units::static_rational<1l> >, boost::units::dimensionless_type>, boost::units::homogeneous_system<boost::units::list<boost::units::si::second_base_unit, boost::units::list<ev_base_unit, boost::units::dimensionless_type> > > >’ /usr/include/boost/units/unit.hpp:93:7: required from ‘struct boost::units::reduce_unit<boost::units::unit<boost::units::list<boost::units::dim<boost::units::time_base_dimension, boost::units::static_rational<1l> >, boost::units::dimensionless_type>, boost::units::homogeneous_system<boost::units::list<boost::units::si::second_base_unit, boost::units::list<ev_base_unit, boost::units::dimensionless_type> > >, void> >’ /usr/include/boost/units/detail/conversion_impl.hpp:314:89: required from ‘struct boost::units::detail::conversion_impl<2>::apply<boost::units::list<boost::units::heterogeneous_system_dim<boost::units::si::second_base_unit, boost::units::static_rational<-1l> >, boost::units::list<boost::units::heterogeneous_system_dim<ev_base_unit, boost::units::static_rational<1l> >, boost::units::dimensionless_type> >, boost::units::homogeneous_system<boost::units::list<boost::units::si::second_base_unit, boost::units::list<ev_base_unit, boost::units::dimensionless_type> > > >’ /usr/include/boost/units/detail/conversion_impl.hpp:445:13: required from ‘struct boost::units::detail::conversion_factor_helper<boost::units::unit<boost::units::list<boost::units::dim<boost::units::length_base_dimension, boost::units::static_rational<2l> >, boost::units::list<boost::units::dim<boost::units::mass_base_dimension, boost::units::static_rational<1l> >, boost::units::list<boost::units::dim<boost::units::time_base_dimension, boost::units::static_rational<-3l> >, boost::units::dimensionless_type> > >, boost::units::heterogeneous_system<boost::units::heterogeneous_system_impl<boost::units::list<boost::units::heterogeneous_system_dim<boost::units::si::second_base_unit, boost::units::static_rational<-1l> >, boost::units::list<boost::units::heterogeneous_system_dim<ev_base_unit, boost::units::static_rational<1l> >, boost::units::dimensionless_type> >, boost::units::list<boost::units::dim<boost::units::length_base_dimension, boost::units::static_rational<2l> >, boost::units::list<boost::units::dim<boost::units::mass_base_dimension, boost::units::static_rational<1l> >, boost::units::list<boost::units::dim<boost::units::time_base_dimension, boost::units::static_rational<-3l> >, boost::units::dimensionless_type> > >, boost::units::dimensionless_type> >, void>, boost::units::unit<boost::units::list<boost::units::dim<boost::units::length_base_dimension, boost::units::static_rational<2l> >, boost::units::list<boost::units::dim<boost::units::mass_base_dimension, boost::units::static_rational<1l> >, boost::units::list<boost::units::dim<boost::units::time_base_dimension, boost::units::static_rational<-3l> >, boost::units::dimensionless_type> > >, boost::units::heterogeneous_system<boost::units::heterogeneous_system_impl<boost::units::list<boost::units::heterogeneous_system_dim<boost::units::si::second_base_unit, boost::units::static_rational<-1l> >, boost::units::list<boost::units::heterogeneous_system_dim<ev_base_unit, boost::units::static_rational<1l> >, boost::units::dimensionless_type> >, boost::units::list<boost::units::dim<boost::units::length_base_dimension, boost::units::static_rational<2l> >, boost::units::list<boost::units::dim<boost::units::mass_base_dimension, boost::units::static_rational<1l> >, boost::units::list<boost::units::dim<boost::units::time_base_dimension, boost::units::static_rational<-3l> >, boost::units::dimensionless_type> > >, boost::units::list<boost::units::scale_list_dim<boost::units::scale<10l, boost::units::static_rational<3l> > >, boost::units::dimensionless_type> > >, void> >’ /usr/include/boost/units/conversion.hpp:176:1: required by substitution of ‘template<class FromUnit, class ToUnit> typename boost::units::one_to_double_type<typename boost::units::detail::conversion_factor_helper<Source, Dest>::type>::type boost::units::conversion_factor(const FromUnit&, const ToUnit&) [with FromUnit = boost::units::unit<boost::units::list<boost::units::dim<boost::units::length_base_dimension, boost::units::static_rational<2l> >, boost::units::list<boost::units::dim<boost::units::mass_base_dimension, boost::units::static_rational<1l> >, boost::units::list<boost::units::dim<boost::units::time_base_dimension, boost::units::static_rational<-3l> >, boost::units::dimensionless_type> > >, boost::units::heterogeneous_system<boost::units::heterogeneous_system_impl<boost::units::list<boost::units::heterogeneous_system_dim<boost::units::si::second_base_unit, boost::units::static_rational<-1l> >, boost::units::list<boost::units::heterogeneous_system_dim<ev_base_unit, boost::units::static_rational<1l> >, boost::units::dimensionless_type> >, boost::units::list<boost::units::dim<boost::units::length_base_dimension, boost::units::static_rational<2l> >, boost::units::list<boost::units::dim<boost::units::mass_base_dimension, boost::units::static_rational<1l> >, boost::units::list<boost::units::dim<boost::units::time_base_dimension, boost::units::static_rational<-3l> >, boost::units::dimensionless_type> > >, boost::units::dimensionless_type> >, void>; ToUnit = boost::units::unit<boost::units::list<boost::units::dim<boost::units::length_base_dimension, boost::units::static_rational<2l> >, boost::units::list<boost::units::dim<boost::units::mass_base_dimension, boost::units::static_rational<1l> >, boost::units::list<boost::units::dim<boost::units::time_base_dimension, boost::units::static_rational<-3l> >, boost::units::dimensionless_type> > >, boost::units::heterogeneous_system<boost::units::heterogeneous_system_impl<boost::units::list<boost::units::heterogeneous_system_dim<boost::units::si::second_base_unit, boost::units::static_rational<-1l> >, boost::units::list<boost::units::heterogeneous_system_dim<ev_base_unit, boost::units::static_rational<1l> >, boost::units::dimensionless_type> >, boost::units::list<boost::units::dim<boost::units::length_base_dimension, boost::units::static_rational<2l> >, boost::units::list<boost::units::dim<boost::units::mass_base_dimension, boost::units::static_rational<1l> >, boost::units::list<boost::units::dim<boost::units::time_base_dimension, boost::units::static_rational<-3l> >, boost::units::dimensionless_type> > >, boost::units::list<boost::units::scale_list_dim<boost::units::scale<10l, boost::units::static_rational<3l> > >, boost::units::dimensionless_type> > >, void>]’ test.cpp:50:58: required from here /usr/include/boost/units/detail/linear_algebra.hpp:197:48: error: no type named ‘item’ in ‘boost::units::list<boost::units::list<boost::units::static_rational<0l, 1l>, boost::units::list<boost::units::static_rational<1l>, boost::units::dimensionless_type> >, boost::units::dimensionless_type>::next {aka struct boost::units::dimensionless_type}’ typedef typename RowsBegin::next::item next_row; ^ /usr/include/boost/units/detail/linear_algebra.hpp:199:39: error: no type named ‘item’ in ‘boost::units::list<boost::units::list<boost::units::static_rational<0l, 1l>, boost::units::list<boost::units::static_rational<1l>, boost::units::dimensionless_type> >, boost::units::dimensionless_type>::next {aka struct boost::units::dimensionless_type}’ next_row::item::Numerator == 0, ^ /usr/include/boost/units/detail/linear_algebra.hpp:199:39: error: no type named ‘item’ in ‘boost::units::list<boost::units::list<boost::units::static_rational<0l, 1l>, boost::units::list<boost::units::static_rational<1l>, boost::units::dimensionless_type> >, boost::units::dimensionless_type>::next {aka struct boost::units::dimensionless_type}’ /usr/include/boost/units/detail/linear_algebra.hpp: In instantiation of ‘struct boost::units::detail::calculate_base_unit_exponents_impl<false>::apply<boost::units::list<boost::units::si::second_base_unit, boost::units::list<ev_base_unit, boost::units::dimensionless_type> >, boost::units::list<boost::units::dim<boost::units::time_base_dimension, boost::units::static_rational<1l> >, boost::units::dimensionless_type> >’: /usr/include/boost/units/detail/linear_algebra.hpp:1051:122: required from ‘struct boost::units::detail::calculate_base_unit_exponents<boost::units::list<boost::units::si::second_base_unit, boost::units::list<ev_base_unit, boost::units::dimensionless_type> >, boost::units::list<boost::units::dim<boost::units::time_base_dimension, boost::units::static_rational<1l> >, boost::units::dimensionless_type> >’ /usr/include/boost/units/heterogeneous_system.hpp:243:93: required from ‘struct boost::units::detail::make_heterogeneous_system<boost::units::list<boost::units::dim<boost::units::time_base_dimension, boost::units::static_rational<1l> >, boost::units::dimensionless_type>, boost::units::homogeneous_system<boost::units::list<boost::units::si::second_base_unit, boost::units::list<ev_base_unit, boost::units::dimensionless_type> > > >’ /usr/include/boost/units/unit.hpp:93:7: required from ‘struct boost::units::reduce_unit<boost::units::unit<boost::units::list<boost::units::dim<boost::units::time_base_dimension, boost::units::static_rational<1l> >, boost::units::dimensionless_type>, boost::units::homogeneous_system<boost::units::list<boost::units::si::second_base_unit, boost::units::list<ev_base_unit, boost::units::dimensionless_type> > >, void> >’ /usr/include/boost/units/detail/conversion_impl.hpp:314:89: required from ‘struct boost::units::detail::conversion_impl<2>::apply<boost::units::list<boost::units::heterogeneous_system_dim<boost::units::si::second_base_unit, boost::units::static_rational<-1l> >, boost::units::list<boost::units::heterogeneous_system_dim<ev_base_unit, boost::units::static_rational<1l> >, boost::units::dimensionless_type> >, boost::units::homogeneous_system<boost::units::list<boost::units::si::second_base_unit, boost::units::list<ev_base_unit, boost::units::dimensionless_type> > > >’ /usr/include/boost/units/detail/conversion_impl.hpp:445:13: required from ‘struct boost::units::detail::conversion_factor_helper<boost::units::unit<boost::units::list<boost::units::dim<boost::units::length_base_dimension, boost::units::static_rational<2l> >, boost::units::list<boost::units::dim<boost::units::mass_base_dimension, boost::units::static_rational<1l> >, boost::units::list<boost::units::dim<boost::units::time_base_dimension, boost::units::static_rational<-3l> >, boost::units::dimensionless_type> > >, boost::units::heterogeneous_system<boost::units::heterogeneous_system_impl<boost::units::list<boost::units::heterogeneous_system_dim<boost::units::si::second_base_unit, boost::units::static_rational<-1l> >, boost::units::list<boost::units::heterogeneous_system_dim<ev_base_unit, boost::units::static_rational<1l> >, boost::units::dimensionless_type> >, boost::units::list<boost::units::dim<boost::units::length_base_dimension, boost::units::static_rational<2l> >, boost::units::list<boost::units::dim<boost::units::mass_base_dimension, boost::units::static_rational<1l> >, boost::units::list<boost::units::dim<boost::units::time_base_dimension, boost::units::static_rational<-3l> >, boost::units::dimensionless_type> > >, boost::units::dimensionless_type> >, void>, boost::units::unit<boost::units::list<boost::units::dim<boost::units::length_base_dimension, boost::units::static_rational<2l> >, boost::units::list<boost::units::dim<boost::units::mass_base_dimension, boost::units::static_rational<1l> >, boost::units::list<boost::units::dim<boost::units::time_base_dimension, boost::units::static_rational<-3l> >, boost::units::dimensionless_type> > >, boost::units::heterogeneous_system<boost::units::heterogeneous_system_impl<boost::units::list<boost::units::heterogeneous_system_dim<boost::units::si::second_base_unit, boost::units::static_rational<-1l> >, boost::units::list<boost::units::heterogeneous_system_dim<ev_base_unit, boost::units::static_rational<1l> >, boost::units::dimensionless_type> >, boost::units::list<boost::units::dim<boost::units::length_base_dimension, boost::units::static_rational<2l> >, boost::units::list<boost::units::dim<boost::units::mass_base_dimension, boost::units::static_rational<1l> >, boost::units::list<boost::units::dim<boost::units::time_base_dimension, boost::units::static_rational<-3l> >, boost::units::dimensionless_type> > >, boost::units::list<boost::units::scale_list_dim<boost::units::scale<10l, boost::units::static_rational<3l> > >, boost::units::dimensionless_type> > >, void> >’ /usr/include/boost/units/conversion.hpp:176:1: required by substitution of ‘template<class FromUnit, class ToUnit> typename boost::units::one_to_double_type<typename boost::units::detail::conversion_factor_helper<Source, Dest>::type>::type boost::units::conversion_factor(const FromUnit&, const ToUnit&) [with FromUnit = boost::units::unit<boost::units::list<boost::units::dim<boost::units::length_base_dimension, boost::units::static_rational<2l> >, boost::units::list<boost::units::dim<boost::units::mass_base_dimension, boost::units::static_rational<1l> >, boost::units::list<boost::units::dim<boost::units::time_base_dimension, boost::units::static_rational<-3l> >, boost::units::dimensionless_type> > >, boost::units::heterogeneous_system<boost::units::heterogeneous_system_impl<boost::units::list<boost::units::heterogeneous_system_dim<boost::units::si::second_base_unit, boost::units::static_rational<-1l> >, boost::units::list<boost::units::heterogeneous_system_dim<ev_base_unit, boost::units::static_rational<1l> >, boost::units::dimensionless_type> >, boost::units::list<boost::units::dim<boost::units::length_base_dimension, boost::units::static_rational<2l> >, boost::units::list<boost::units::dim<boost::units::mass_base_dimension, boost::units::static_rational<1l> >, boost::units::list<boost::units::dim<boost::units::time_base_dimension, boost::units::static_rational<-3l> >, boost::units::dimensionless_type> > >, boost::units::dimensionless_type> >, void>; ToUnit = boost::units::unit<boost::units::list<boost::units::dim<boost::units::length_base_dimension, boost::units::static_rational<2l> >, boost::units::list<boost::units::dim<boost::units::mass_base_dimension, boost::units::static_rational<1l> >, boost::units::list<boost::units::dim<boost::units::time_base_dimension, boost::units::static_rational<-3l> >, boost::units::dimensionless_type> > >, boost::units::heterogeneous_system<boost::units::heterogeneous_system_impl<boost::units::list<boost::units::heterogeneous_system_dim<boost::units::si::second_base_unit, boost::units::static_rational<-1l> >, boost::units::list<boost::units::heterogeneous_system_dim<ev_base_unit, boost::units::static_rational<1l> >, boost::units::dimensionless_type> >, boost::units::list<boost::units::dim<boost::units::length_base_dimension, boost::units::static_rational<2l> >, boost::units::list<boost::units::dim<boost::units::mass_base_dimension, boost::units::static_rational<1l> >, boost::units::list<boost::units::dim<boost::units::time_base_dimension, boost::units::static_rational<-3l> >, boost::units::dimensionless_type> > >, boost::units::list<boost::units::scale_list_dim<boost::units::scale<10l, boost::units::static_rational<3l> > >, boost::units::dimensionless_type> > >, void>]’ test.cpp:50:58: required from here /usr/include/boost/units/detail/linear_algebra.hpp:1045:96: error: could not convert template argument ‘boost::units::detail::normalize_units<boost::units::list<boost::units::si::second_base_unit, boost::units::list<ev_base_unit, boost::units::dimensionless_type> > >::extra’ to ‘int’ typedef typename strip_zeroes_impl<base_solutions::extra>::template apply<units>::type type; ^ test.cpp: In function ‘int main(int, char**)’: test.cpp:50:58: error: no matching function for call to ‘conversion_factor(boost::units::divide_typeof_helper<boost::units::unit<boost::units::list<boost::units::dim<boost::units::length_base_dimension, boost::units::static_rational<2l> >, boost::units::list<boost::units::dim<boost::units::mass_base_dimension, boost::units::static_rational<1l> >, boost::units::list<boost::units::dim<boost::units::time_base_dimension, boost::units::static_rational<-2l> >, boost::units::dimensionless_type> > >, boost::units::heterogeneous_system<boost::units::heterogeneous_system_impl<boost::units::list<boost::units::heterogeneous_system_dim<ev_base_unit, boost::units::static_rational<1l> >, boost::units::dimensionless_type>, boost::units::list<boost::units::dim<boost::units::length_base_dimension, boost::units::static_rational<2l> >, boost::units::list<boost::units::dim<boost::units::mass_base_dimension, boost::units::static_rational<1l> >, boost::units::list<boost::units::dim<boost::units::time_base_dimension, boost::units::static_rational<-2l> >, boost::units::dimensionless_type> > >, boost::units::dimensionless_type> >, void>, boost::units::unit<boost::units::list<boost::units::dim<boost::units::time_base_dimension, boost::units::static_rational<1l> >, boost::units::dimensionless_type>, boost::units::homogeneous_system<boost::units::list<boost::units::si::meter_base_unit, boost::units::list<boost::units::scaled_base_unit<boost::units::cgs::gram_base_unit, boost::units::scale<10l, boost::units::static_rational<3l> > >, boost::units::list<boost::units::si::second_base_unit, boost::units::list<boost::units::si::ampere_base_unit, boost::units::list<boost::units::si::kelvin_base_unit, boost::units::list<boost::units::si::mole_base_unit, boost::units::list<boost::units::si::candela_base_unit, boost::units::list<boost::units::angle::radian_base_unit, boost::units::list<boost::units::angle::steradian_base_unit, boost::units::dimensionless_type> > > > > > > > > > > >::type, boost::units::divide_typeof_helper<boost::units::unit<boost::units::list<boost::units::dim<boost::units::length_base_dimension, boost::units::static_rational<2l> >, boost::units::list<boost::units::dim<boost::units::mass_base_dimension, boost::units::static_rational<1l> >, boost::units::list<boost::units::dim<boost::units::time_base_dimension, boost::units::static_rational<-2l> >, boost::units::dimensionless_type> > >, boost::units::heterogeneous_system<boost::units::heterogeneous_system_impl<boost::units::list<boost::units::heterogeneous_system_dim<ev_base_unit, boost::units::static_rational<1l> >, boost::units::dimensionless_type>, boost::units::list<boost::units::dim<boost::units::length_base_dimension, boost::units::static_rational<2l> >, boost::units::list<boost::units::dim<boost::units::mass_base_dimension, boost::units::static_rational<1l> >, boost::units::list<boost::units::dim<boost::units::time_base_dimension, boost::units::static_rational<-2l> >, boost::units::dimensionless_type> > >, boost::units::list<boost::units::scale_list_dim<boost::units::scale<10l, boost::units::static_rational<3l> > >, boost::units::dimensionless_type> > >, void>, boost::units::unit<boost::units::list<boost::units::dim<boost::units::time_base_dimension, boost::units::static_rational<1l> >, boost::units::dimensionless_type>, boost::units::homogeneous_system<boost::units::list<boost::units::si::meter_base_unit, boost::units::list<boost::units::scaled_base_unit<boost::units::cgs::gram_base_unit, boost::units::scale<10l, boost::units::static_rational<3l> > >, boost::units::list<boost::units::si::second_base_unit, boost::units::list<boost::units::si::ampere_base_unit, boost::units::list<boost::units::si::kelvin_base_unit, boost::units::list<boost::units::si::mole_base_unit, boost::units::list<boost::units::si::candela_base_unit, boost::units::list<boost::units::angle::radian_base_unit, boost::units::list<boost::units::angle::steradian_base_unit, boost::units::dimensionless_type> > > > > > > > > > > >::type)’ << conversion_factor(eV/si::second, keV/si::second) ^ test.cpp:50:58: note: candidate is: In file included from /usr/include/boost/units/quantity.hpp:29:0, from /usr/include/boost/units/systems/si.hpp:19, from test.cpp:4: /usr/include/boost/units/conversion.hpp:176:1: note: template<class FromUnit, class ToUnit> typename boost::units::one_to_double_type<typename boost::units::detail::conversion_factor_helper<Source, Dest>::type>::type boost::units::conversion_factor(const FromUnit&, const ToUnit&) conversion_factor(const FromUnit&,const ToUnit&) ^ /usr/include/boost/units/conversion.hpp:176:1: note: substitution of deduced template arguments resulted in errors seen above

2 1

Name generators for Boost Uuids
by Arindam Mukherjee 22 May '14

22 May '14

What is the specific use case for name generators for Boost Uuids? The generated uuids are still globally unique right, not just in the scope of a named domain? How is the algorithm different from the random generator? Are MAC addresses used in both cases? Thanks, Arindam

1 0

[Xpressive] Placeholder for user defined assertion
by LOL 22 May '14

22 May '14

I am trying to use a placeholder object for the check function in an xpressive regex. The error I usually get is "error C2064: term does not evaluate to a function taking 1 arguments" Please see my example below that uses the three_or_six user-defined assertion as described at http://www.boost.org/doc/libs/1_51_0/doc/html/xpressive/user_s_guide.html#b…. I am using boost 1.51 and Visual Studio 2010 Express. This is a contrived example; the real reason I am trying to do this is because my assertion has state that is not known at the time the regex is compiled. In the interim I have worked around it by using static variables instead of placeholders but that makes for more brittle code than I would like. Also, is there any way to reuse the match_results objects that are created by the iterator syntax? Thanks, Michael Mitchell //Inspired by https://groups.google.com/forum/#!topic/boost-list/hTBAT7KMgd4 #include <iostream> #include <boost/xpressive/regex_actions.hpp> #include <boost/xpressive/xpressive_static.hpp> using namespace std; using namespace boost::xpressive; // A predicate that is true IFF a sub-match is // either 3 or 6 characters long. struct three_or_six { bool operator()(ssub_match const &sub) const { return sub.length() == 3 || sub.length() == 6; } }; int main(int argc, char* argv[]) { int cnt = 0; string a_str("a_aaaaa___a_aa_aaa_"); // match words of 3 characters or 6 characters (this works). sregex expr1 = (bow >> +_w >> eow)[ check(three_or_six()) ] ; placeholder<three_or_six> tos_ph; sregex expr2 = (bow >> +_w >> eow)[ check(tos_ph) ] ; // The above does not work (error C2064: term does not evaluate to a function taking 1 arguments) placeholder<three_or_six*> tos_ptr_ph; sregex expr3 = (bow >> +_w >> eow)[ check(*tos_ptr_ph) ] ; // The above does not work (error 2676: binary '&&' : 'three_or_six' does not define this operator or a converstion to a type acceptable to the predefinied operator) sregex_iterator iter1(a_str.begin(), a_str.end(), expr1); three_or_six tos; sregex_iterator iter2(a_str.begin(), a_str.end(), expr2, let(tos_ph = tos)); three_or_six* tos_ptr = new three_or_six(); sregex_iterator iter3(a_str.begin(), a_str.end(), expr3, let(tos_ptr_ph = tos_ptr)); return 0; }

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[ANN] libstudxml - modern XML API for C++
by Boris Kolpackov 21 May '14

21 May '14

Hi, libstudxml is an XML library for modern, standard C++. It has an API that I believe should have already been in Boost or even in the C++ standard library. The API was first presented at the C++Now 2014 conference. Based on the positive feedback and encouragement I received during the talk, I've decided to make the implementation generally available. As an example, we can parse this XML: <person id="123"> <name>John Doe</name> <age>23</age> <gender>male</gender> </person> With the following C++ code, which performs all the validation necessary for this XML vocabulary: enum class gender {...}; ifstream ifs (argv[1]); parser p (ifs, argv[1]); p.next_expect (parser::start_element, "person", content::complex); long id = p.attribute<long> ("id"); string n = p.element ("name"); short a = p.element<short> ("age"); gender g = p.element<gender> ("gender"); p.next_expect (parser::end_element); // person The API has the following interesting features: * Streaming pull parser and streaming serializer * Two-level API: minimum overhead low-level & more convenient high-level * Content model-aware (empty, simple, complex, mixed) * Whitespace processing based on content model * Validation based on content model * Validation of missing/extra attributes * Validation of unexpected events (elements, etc) * Data extraction to value types * Attribute map with extended lifetime (high-level API) libstudxml is compact, external dependency-free, and reasonably efficient. The XML parser is a conforming, non-validating XML 1.0 implementation that is based on tested and proven code. The library is released under the MIT license. More information, documentation, and source code are available from: http://www.codesynthesis.com/projects/libstudxml/ Or, you can jump directly to the API description with examples: http://www.codesynthesis.com/projects/libstudxml/doc/intro.xhtml#2 Enjoy, Boris

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Boost test and openmpi
by Martin Vymazal 21 May '14

21 May '14

Hello, I have the following code: #define BOOST_TEST_DYN_LINK #define BOOST_TEST_MODULE mpi_functionality #include <boost/test/unit_test.hpp> #include "mpi.h" struct MPI_Functionality_Fixture { MPI_Functionality_Fixture() { m_argc = boost::unit_test::framework::master_test_suite().argc; m_argv = boost::unit_test::framework::master_test_suite().argv; } int m_argc; char** m_argv; }; BOOST_FIXTURE_TEST_SUITE( MPI_Functionality_TestSuite, MPI_Functionality_Fixture ) BOOST_AUTO_TEST_CASE( mpi_functionality_parenv_init ) { MPI_Init(&m_argc,&m_argv); } BOOST_AUTO_TEST_CASE( mpi_functionality_parenv_finalize ) { MPI_Finalize(); } BOOST_AUTO_TEST_SUITE_END() The code compiles fine, but I have the following problem when I try to run it. When I run as 'mpirun ./my_executable' or 'mpirun -np 3 ./my_executable' everything goes fine. On the other hand, when I run as ./my_executable I get the following error: unknown location(0): fatal error in "mpi_functionality_parenv_finalize": unrecognized signal Outside of Boost, it is perfectly possible to write a program which calls MPI_Init and MPI_Finalize and it does not have to be used with mpirun. I wonder if this (different) behavior of Boost test is normal. I did not find any remarks regarding Boost test and mpi in the tutorial. Best regards, Martin Vymazal

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Wrapper for maybe an iterator
by Jens Müller 20 May '14

20 May '14

Hi, I am looking for an iterator that can be incremented safely (but not dereferenced) without when it has been default-constructed, and when it has been constructed with another iterator, it is just a proxy for that iterator. Is there such a thing in Boost? BR, Jens

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Graph Library Question
by Ken Kazinski 20 May '14

20 May '14

Hi, I was able to find the shortest distances between my starting node and the rest of the nodes. Now I would like to output the path between my starting node and destination node. I have tried a number of different examples but none of them seem to do what I want. I am pretty sure I need to use some type of get but I can not find it in the documentation. Thanks for any help.

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