xref: /llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_v.verify.cpp (revision 4528c44d0a82f2b5fe25757b28b185c3c880cfb2)
1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 // UNSUPPORTED: c++03, c++11, c++14
10 
11 // <tuple>
12 
13 // template <class T> constexpr size_t tuple_size_v = tuple_size<T>::value;
14 
15 // Expect failures with a reference type, pointer type, and a non-tuple type.
16 
17 #include <tuple>
18 
f()19 void f() {
20   (void)std::tuple_size_v<std::tuple<>&>; // expected-note {{requested here}}
21   (void)std::tuple_size_v<int>;           // expected-note {{requested here}}
22   (void)std::tuple_size_v<std::tuple<>*>; // expected-note {{requested here}}
23                                           // expected-error@*:* 3 {{implicit instantiation of undefined template}}
24 }
25