File: sfinae32.C

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gcc-arm-none-eabi 15%3A8-2019-q3-1
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// PR c++/51989
// { dg-do compile { target c++11 } }

template <typename T>
struct is_container
{
  template <typename U, typename V = decltype(((U*)0)->begin())>
  static char test(U* u);

  template <typename U> static long test(...);

  enum { value = sizeof test<T>(0) == 1 };
};

int main()
{
  return is_container<void>::value;
}