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// { dg-options -std=c++0x }

template

struct IsNegative {

  int dummy; // Workaround for empty class problem

  constexpr IsNegative() : dummy(0) {}

  constexpr bool operator()(const T& x) {

    return x < T(0);

  }

};

template

constexpr bool has_neg(T (&x)[N], Pred p) {

  return p(x[0]) || p(x[1]);

}

constexpr int a[] = {1, -2};

constexpr auto answer = has_neg(a, IsNegative{}); // #1

static_assert(answer, "Error");