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// { dg-do compile { target c++11 } }
template<class T>
constexpr T do_last(T* x, int n) {
return x[n - 1]; //
}
template<class T, int N>
constexpr T last(T (&x)[N]) {
return do_last(x, N);
}
constexpr bool is_negative(int x) { return x < 0; }
template<class T>
struct IsNegative {
constexpr bool operator()(const T& x) {
return x < T(0);
}
};
template<class T, int N, class Pred>
constexpr bool has_neg(T (&x)[N], Pred p) {
return p(last(x)); // Line 22
}
constexpr int a[] = {1, -2};
constexpr auto answer1 = has_neg(a, IsNegative<int>{}); // Line 27
constexpr auto answer2 = has_neg(a, is_negative);
static_assert(answer2 == answer1, "Error");
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