template <class T, class U> struct is_same : public true_type-or-false_type {}; 'boost::is_same' : invalid template argument for 'T', type expected is_same need type, not const value. You can use: BOOST_STATIC_ASSERT((P == eDivide && Q == eMinus) || (P == eMult && Q == ePlus));
Message: 4 Date: Fri, 27 May 2011 10:22:24 +0100 From: przemyslaw.sliwa@uk.bnpparibas.com To: boost-users@lists.boost.org Subject: [Boost-users] using boost::is_same with enums Message-ID: <OF533BB172.765E47C7-ON8025789D.00332EF1-8025789D.00337D99@bnpparibas .com>
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Hello,
I am trying to use boost::is_same in the folloting case
enum eOperation { ePlus = 0, eMinus, eMult, eDivide };
template<eOperation P, eOperation Q> boost::shared_ptr<std::vector<intervalPtr> > convertIntervals() const { BOOST_STATIC_ASSERT( (boost::is_same<P, eDivide>::value && boost::is_same<Q, eMinus>::value) || (boost::is_same<P, eMult>::value && boost::is_same<Q, ePlus>::value));
static const double dNoOfSecsInADay(3600*24); boost::shared_ptr<std::vector<intervalPtr> > out(new std::vector<intervalPtr>(m_intervals.size()));
// more code here
return out; }
Could someone help me with this? it does not compile at all on VC++2010. The error i get is
1>Pshemek -> this needs to be improved, no constructor calls at all when merged back to HEAD 1>d:\dev\13_1x\development\cpp\market\event.cpp(668) : error C2974: 'boost::is_same' : invalid template argument for 'T', type expected 1> d:\dev\13_1x\thirdparty\boost\type_traits\is_same.hpp(37) : see declaration of 'boost::is_same' 1> d:\dev\13_1x\development\cpp\market\event.cpp(689) : see reference to function template instantiation 'boost::shared_ptr<T> SohoEvents::StandardDayEvent::convertIntervals<eDivide,eMinus>(void) const' being compiled 1> with 1> [ 1> T=std::vector<SohoEvents::intervalPtr> 1> ] 1>d:\dev\13_1x\development\cpp\market\event.cpp(668) : error C2974: 'boost::is_same' : invalid template argument for 'U', type expected 1> d:\dev\13_1x\thirdparty\boost\type_traits\is_same.hpp(37) : see declaration of 'boost::is_same' 1>d:\dev\13_1x\development\cpp\market\event.cpp(668) : error C2955: 'boost::is_same' : use of class template requires template argument list 1> d:\dev\13_1x\thirdparty\boost\type_traits\is_same.hpp(37) : see declaration of 'boost::is_same' 1>d:\dev\13_1x\development\cpp\market\event.cpp(668) : error C2974: 'boost::is_same' : invalid template argument for 'T', type expected 1> d:\dev\13_1x\thirdparty\boost\type_traits\is_same.hpp(37) : see declaration of 'boost::is_same' 1>d:\dev\13_1x\development\cpp\market\event.cpp(668) : error C2974: 'boost::is_same' : invalid template argument for 'U', type expected 1> d:\dev\13_1x\thirdparty\boost\type_traits\is_same.hpp(37) : see declaration of 'boost::is_same' 1>d:\dev\13_1x\development\cpp\market\event.cpp(668) : error C2955: 'boost::is_same' : use of class template requires template argument list 1> d:\dev\13_1x\thirdparty\boost\type_traits\is_same.hpp(37) : see declaration of 'boost::is_same' 1>d:\dev\13_1x\development\cpp\market\event.cpp(668) : error C2974: 'boost::is_same' : invalid template argument for 'T', type expected 1> d:\dev\13_1x\thirdparty\boost\type_traits\is_same.hpp(37) : see declaration of 'boost::is_same' 1>d:\dev\13_1x\development\cpp\market\event.cpp(668) : error C2974: 'boost::is_same' : invalid template argument for 'U', type expected 1> d:\dev\13_1x\thirdparty\boost\type_traits\is_same.hpp(37) : see declaration of 'boost::is_same' 1>d:\dev\13_1x\development\cpp\market\event.cpp(668) : error C2955: 'boost::is_same' : use of class template requires template argument list 1> d:\dev\13_1x\thirdparty\boost\type_traits\is_same.hpp(37) : see declaration of 'boost::is_same' 1>d:\dev\13_1x\development\cpp\market\event.cpp(668) : error C2974: 'boost::is_same' : invalid template argument for 'T', type expected 1> d:\dev\13_1x\thirdparty\boost\type_traits\is_same.hpp(37) : see declaration of 'boost::is_same' 1>d:\dev\13_1x\development\cpp\market\event.cpp(668) : error C2974: 'boost::is_same' : invalid template argument for 'U', type expected 1> d:\dev\13_1x\thirdparty\boost\type_traits\is_same.hpp(37) : see declaration of 'boost::is_same' 1>d:\dev\13_1x\development\cpp\market\event.cpp(668) : error C2955: 'boost::is_same' : use of class template requires template argument list 1> d:\dev\13_1x\thirdparty\boost\type_traits\is_same.hpp(37) : see declaration of 'boost::is_same' 1>d:\dev\13_1x\development\cpp\market\event.cpp(668) : error C2027: use of undefined type 'boost::STATIC_ASSERTION_FAILURE<x>' 1> with 1> [ 1> x=false 1> ] 1>d:\dev\13_1x\development\cpp\market\event.cpp(668) : error C2974: 'boost::is_same' : invalid template argument for 'T', type expected 1> d:\dev\13_1x\thirdparty\boost\type_traits\is_same.hpp(37) : see declaration of 'boost::is_same' 1> d:\dev\13_1x\development\cpp\market\event.cpp(713) : see reference to function template instantiation 'boost::shared_ptr<T> SohoEvents::StandardDayEvent::convertIntervals<eMult,ePlus>(void) const' being compiled 1> with 1> [ 1> T=std::vector<SohoEvents::intervalPtr> 1> ] 1>d:\dev\13_1x\development\cpp\market\event.cpp(668) : error C2974: 'boost::is_same' : invalid template argument for 'U', type expected 1> d:\dev\13_1x\thirdparty\boost\type_traits\is_same.hpp(37) : see declaration of 'boost::is_same' 1>d:\dev\13_1x\development\cpp\market\event.cpp(668) : error C2955: 'boost::is_same' : use of class template requires template argument list 1> d:\dev\13_1x\thirdparty\boost\type_traits\is_same.hpp(37) : see declaration of 'boost::is_same' 1>d:\dev\13_1x\development\cpp\market\event.cpp(668) : error C2974: 'boost::is_same' : invalid template argument for 'T', type expected 1> d:\dev\13_1x\thirdparty\boost\type_traits\is_same.hpp(37) : see declaration of 'boost::is_same' 1>d:\dev\13_1x\development\cpp\market\event.cpp(668) : error C2974: 'boost::is_same' : invalid template argument for 'U', type expected 1> d:\dev\13_1x\thirdparty\boost\type_traits\is_same.hpp(37) : see declaration of 'boost::is_same' 1>d:\dev\13_1x\development\cpp\market\event.cpp(668) : error C2955: 'boost::is_same' : use of class template requires template argument list 1> d:\dev\13_1x\thirdparty\boost\type_traits\is_same.hpp(37) : see declaration of 'boost::is_same' 1>d:\dev\13_1x\development\cpp\market\event.cpp(668) : error C2974: 'boost::is_same' : invalid template argument for 'T', type expected 1> d:\dev\13_1x\thirdparty\boost\type_traits\is_same.hpp(37) : see declaration of 'boost::is_same' 1>d:\dev\13_1x\development\cpp\market\event.cpp(668) : error C2974: 'boost::is_same' : invalid template argument for 'U', type expected 1> d:\dev\13_1x\thirdparty\boost\type_traits\is_same.hpp(37) : see declaration of 'boost::is_same' 1>d:\dev\13_1x\development\cpp\market\event.cpp(668) : error C2955: 'boost::is_same' : use of class template requires template argument list 1> d:\dev\13_1x\thirdparty\boost\type_traits\is_same.hpp(37) : see declaration of 'boost::is_same' 1>d:\dev\13_1x\development\cpp\market\event.cpp(668) : error C2974: 'boost::is_same' : invalid template argument for 'T', type expected 1> d:\dev\13_1x\thirdparty\boost\type_traits\is_same.hpp(37) : see declaration of 'boost::is_same' 1>d:\dev\13_1x\development\cpp\market\event.cpp(668) : error C2974: 'boost::is_same' : invalid template argument for 'U', type expected 1> d:\dev\13_1x\thirdparty\boost\type_traits\is_same.hpp(37) : see declaration of 'boost::is_same' 1>d:\dev\13_1x\development\cpp\market\event.cpp(668) : error C2955: 'boost::is_same' : use of class template requires template argument list 1> d:\dev\13_1x\thirdparty\boost\type_traits\is_same.hpp(37) : see declaration of 'boost::is_same' 1>d:\dev\13_1x\development\cpp\market\event.cpp(668) : error C2027: use of undefined type 'boost::STATIC_ASSERTION_FAILURE<x>' 1> with 1> [ 1> x=false 1> ] 1>Build log was saved at "file://d:\Dev\13_1X\Development\CPP\market\Debug\BuildLog.htm" 1>Market - 26 error(s), 0 warning(s) ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
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