blob: aad003039ecda9dec0cd202bfd7f6c696230eb88 [file] [log] [blame]
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// <tuple>
// template <class... Types> class tuple;
// template <class... Types>
// class tuple_size<tuple<Types...>>
// : public integral_constant<size_t, sizeof...(Types)> { };
// XFAIL: gcc-4.9
// UNSUPPORTED: c++98, c++03
#include <tuple>
#include <type_traits>
#include "test_macros.h"
template <class T, class = decltype(std::tuple_size<T>::value)>
constexpr bool has_value(int) { return true; }
template <class> constexpr bool has_value(long) { return false; }
template <class T> constexpr bool has_value() { return has_value<T>(0); }
struct Dummy {};
int main(int, char**) {
// Test that the ::value member does not exist
static_assert(has_value<std::tuple<int> const>(), "");
static_assert(has_value<std::pair<int, long> volatile>(), "");
static_assert(!has_value<int>(), "");
static_assert(!has_value<const int>(), "");
static_assert(!has_value<volatile void>(), "");
static_assert(!has_value<const volatile std::tuple<int>&>(), "");
return 0;
}