gcc/testsuite/g++.dg/cpp2a/nontype-class8.C

   1 // If the entity is a template parameter object for a template parameter of
   2 // type T, the type of the expression is const T.
   3
   4 // { dg-do compile { target c++2a } }
   5
   6 template <class T, class U> struct same;
   7 template <class T> struct same<T,T> {};
   8
   9 struct A {
  10   int i;
  11   // auto operator<=> (const A&) = default;
  12 };
  13 void f(A&) = delete;
  14 void f(const A&) { }
  15
  16 template < A a > struct B
  17 {
  18   B()
  19   {
  20     f(a);
  21     same<A,decltype(a)> s;
  22     same<const A&,decltype((a))> s2;
  23   }
  24 };
  25
  26 B<A{42}> b;