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// PR c++/83205
// { dg-do compile { target c++11 } }
// { dg-options "" }
struct A { int i; };
struct B { int i; };
namespace std {
template <typename T> struct tuple_size;
template <> struct tuple_size<A> {
static constexpr int value = -1;
};
#ifdef __SIZEOF_INT128__
template <> struct tuple_size<B> {
static constexpr unsigned __int128 value = -1;
};
#endif
}
auto [a] = A{}; // { dg-error "1 name provided" }
// { dg-message "while 'A' decomposes into -1 elements" "" { target *-*-* } .-1 }
// { dg-warning "structured bindings only available with" "" { target c++14_down } .-2 }
#ifdef __SIZEOF_INT128__
auto [b] = B{}; // { dg-error "1 name provided" "" { target int128 } }
// { dg-message "while 'B' decomposes into \[0-9xa-fXA-F]* elements" "" { target int128 } .-1 }
// { dg-warning "structured bindings only available with" "" { target { c++14_down && int128 } } .-2 }
auto [c, d] = B{}; // { dg-error "2 names provided" "" { target int128 } }
// { dg-message "while 'B' decomposes into \[0-9xa-fXA-F]* elements" "" { target int128 } .-1 }
// { dg-warning "structured bindings only available with" "" { target { c++14_down && int128 } } .-2 }
#endif
auto [e, f, g] = A{}; // { dg-error "3 names provided" }
// { dg-message "while 'A' decomposes into -1 elements" "" { target *-*-* } .-1 }
// { dg-warning "structured bindings only available with" "" { target c++14_down } .-2 }
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