gcc/testsuite/g++.dg/cpp0x/constexpr-63265.C

   1 // PR c++/63265
   2 // { dg-do compile { target c++11 } }
   3
   4 #define LSHIFT (sizeof(unsigned int) * __CHAR_BIT__)
   5
   6 template <int lshift>
   7 struct SpuriouslyWarns1 {
   8     static constexpr unsigned int v = lshift < LSHIFT ? 1U << lshift : 0;
   9 };
  10
  11 static_assert(SpuriouslyWarns1<LSHIFT>::v == 0, "Impossible occurred");
  12
  13 template <int lshift>
  14 struct SpuriouslyWarns2 {
  15     static constexpr bool okay = lshift < LSHIFT;
  16     static constexpr unsigned int v = okay ? 1U << lshift : 0;
  17 };
  18
  19 static_assert(SpuriouslyWarns2<LSHIFT>::v == 0, "Impossible occurred");