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// P1091R3
// { dg-do compile { target { c++17 && c++14_down } } }
namespace std {
template<typename T> struct tuple_size;
template<int, typename> struct tuple_element;
}
struct A {
int i;
A(int x) : i(x) {}
template <int I> int& get() { return i; }
};
struct B { int a, b, c; };
template<> struct std::tuple_size<A> { static const int value = 2; };
template<int I> struct std::tuple_element<I,A> { using type = int; };
B s = { 1, 2, 3 };
#line 1
static auto [ d, e, f ] = s;
static auto [ g, h ] = A (42);
int &
foo (int x)
{
switch (x)
{
case 0: return d;
case 1: return e;
case 2: return f;
case 3: return g;
default: return h;
}
}
int
bar (int x)
{
#line 3
static auto [ m, n, o ] = s;
static auto [ p, q ] = A (43);
switch (x)
{
case 0: return ++m;
case 1: return ++n;
case 2: return ++o;
case 3: return ++p;
default: return ++q;
}
}
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