gcc/testsuite/g++.dg/cpp1y/static_assert1.C

   1 // { dg-do compile }
   2 // { dg-options "-std=gnu++14 -pedantic" }
   3
   4 template<typename T>
   5   struct is_float
   6   {
   7     static constexpr bool value = false;
   8   };
   9
  10 template<>
  11   struct is_float<float>
  12   {
  13     static constexpr bool value = true;
  14   };
  15
  16 template<typename T>
  17   T
  18   float_thing(T __x)
  19   {
  20     static_assert(is_float<T>::value, ""); // { dg-error "static assertion failed" }
  21     static_assert(is_float<T>::value); // { dg-error "static assertion failed" }
  22     return T();
  23   }
  24
  25 int
  26 main()
  27 {
  28   float_thing(1);
  29 }
  30
  31 // { dg-warning "'static_assert' without a message only available with " "" { target *-*-* } 21 }