1 #include <tuple>
2 
3 template <int Arg>
4 class TestObj
5 {
6 public:
getArg()7   int getArg()
8   {
9     return Arg;
10   }
11 };
12 
13 //----------------------------------------------------------------------
14 // Define a template class that we can specialize with an enumeration
15 //----------------------------------------------------------------------
16 enum class EnumType
17 {
18     Member,
19     Subclass
20 };
21 
22 template <EnumType Arg> class EnumTemplate;
23 
24 //----------------------------------------------------------------------
25 // Specialization for use when "Arg" is "EnumType::Member"
26 //----------------------------------------------------------------------
27 template <>
28 class EnumTemplate<EnumType::Member>
29 {
30 public:
EnumTemplate(int m)31     EnumTemplate(int m) :
32         m_member(m)
33     {
34     }
35 
getMember() const36     int getMember() const
37     {
38         return m_member;
39     }
40 
41 protected:
42     int m_member;
43 };
44 
45 //----------------------------------------------------------------------
46 // Specialization for use when "Arg" is "EnumType::Subclass"
47 //----------------------------------------------------------------------
48 template <>
49 class EnumTemplate<EnumType::Subclass> :
50     public EnumTemplate<EnumType::Member>
51 {
52 public:
EnumTemplate(int m)53     EnumTemplate(int m) : EnumTemplate<EnumType::Member>(m)
54     {
55     }
56 };
57 
58 template <typename FLOAT> struct T1 { FLOAT f = 1.5; };
59 template <typename FLOAT> struct T2 { FLOAT f = 2.5; int i = 42; };
60 template <typename FLOAT, template <typename> class ...Args> class C { std::tuple<Args<FLOAT>...> V; };
61 
main(int argc,char ** argv)62 int 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 1
71 }
72