test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_v.fail.cpp


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//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// UNSUPPORTED: c++98, c++03, c++11, c++14

// <tuple>

// template <class T> constexpr size_t tuple_size_v = tuple_size<T>::value;

// Expect failures with a reference type, pointer type, and a non-tuple type.

#include <tuple>

int main()
{
    (void)std::tuple_size_v<std::tuple<> &>; // expected-note {{requested here}}
    (void)std::tuple_size_v<int>; // expected-note {{requested here}}
    (void)std::tuple_size_v<std::tuple<>*>; // expected-note {{requested here}}
    // expected-error@tuple:* 3 {{implicit instantiation of undefined template}}
}