72 lines · cpp
1#include <tuple>2 3template <int Arg>4class TestObj5{6public:7 int getArg()8 {9 return Arg;10 }11};12 13//----------------------------------------------------------------------14// Define a template class that we can specialize with an enumeration15//----------------------------------------------------------------------16enum class EnumType17{18 Member,19 Subclass20};21 22template <EnumType Arg> class EnumTemplate;23 24//----------------------------------------------------------------------25// Specialization for use when "Arg" is "EnumType::Member"26//----------------------------------------------------------------------27template <>28class EnumTemplate<EnumType::Member> 29{30public:31 EnumTemplate(int m) :32 m_member(m)33 {34 }35 36 int getMember() const37 {38 return m_member;39 }40 41protected:42 int m_member;43};44 45//----------------------------------------------------------------------46// Specialization for use when "Arg" is "EnumType::Subclass"47//----------------------------------------------------------------------48template <>49class EnumTemplate<EnumType::Subclass> : 50 public EnumTemplate<EnumType::Member> 51{52public:53 EnumTemplate(int m) : EnumTemplate<EnumType::Member>(m)54 {55 } 56};57 58template <typename FLOAT> struct T1 { FLOAT f = 1.5; };59template <typename FLOAT> struct T2 { FLOAT f = 2.5; int i = 42; };60template <typename FLOAT, template <typename> class ...Args> class C { std::tuple<Args<FLOAT>...> V; };61 62int main(int argc, char **argv)63{64 TestObj<1> testpos;65 TestObj<-1> testneg;66 EnumTemplate<EnumType::Member> member(123);67 EnumTemplate<EnumType::Subclass> subclass(123*2);68 C<float, T1> c1;69 C<double, T1, T2> c2;70 return testpos.getArg() - testneg.getArg() + member.getMember()*2 - subclass.getMember(); // Breakpoint 171}72