| // 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 } |
