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// { dg-do compile { target c++11 } }
// From N2235
// 4.5.3 constant expressions
// p 4
struct A {
constexpr A(int i) : val(i) { }
constexpr operator int() { return val; }
constexpr operator long() { return -1; }
private:
int val;
};
template<int I> struct X { static const int i = I; };
constexpr A a = 42;
X<a> x; // OK: unique conversion to int
int ar[X<a>::i]; // also OK
int ary[a]; // { dg-error "ambiguous|conversion|array" } ambiguous conversion
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