2 // { dg-do compile { target c++11 } }
8 template <typename T> struct tuple_size;
9 template <> struct tuple_size<A> {
10 static constexpr int value = -1;
12 #ifdef __SIZEOF_INT128__
13 template <> struct tuple_size<B> {
14 static constexpr unsigned __int128 value = -1;
19 auto [a] = A{}; // { dg-error "1 name provided" }
20 // { dg-message "while 'A' decomposes into -1 elements" "" { target *-*-* } .-1 }
21 // { dg-warning "structured bindings only available with" "" { target c++14_down } .-2 }
22 #ifdef __SIZEOF_INT128__
23 auto [b] = B{}; // { dg-error "1 name provided" "" { target int128 } }
24 // { dg-message "while 'B' decomposes into \[0-9xa-fXA-F]* elements" "" { target int128 } .-1 }
25 // { dg-warning "structured bindings only available with" "" { target { c++14_down && int128 } } .-2 }
26 auto [c, d] = B{}; // { dg-error "2 names provided" "" { target int128 } }
27 // { dg-message "while 'B' decomposes into \[0-9xa-fXA-F]* elements" "" { target int128 } .-1 }
28 // { dg-warning "structured bindings only available with" "" { target { c++14_down && int128 } } .-2 }
30 auto [e, f, g] = A{}; // { dg-error "3 names provided" }
31 // { dg-message "while 'A' decomposes into -1 elements" "" { target *-*-* } .-1 }
32 // { dg-warning "structured bindings only available with" "" { target c++14_down } .-2 }