| 1 | //===----------------------------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | // <tuple> |
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| 10 | |
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| 11 | // template <class... Types> class tuple; |
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| 12 | |
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| 13 | // template <class... Types> |
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| 14 | // class tuple_size<tuple<Types...>> |
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| 15 | // : public integral_constant<size_t, sizeof...(Types)> { }; |
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| 16 | |
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| 17 | // UNSUPPORTED: c++03 |
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| 18 | |
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| 19 | #include <tuple> |
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| 20 | #include <utility> |
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| 21 | |
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| 22 | #include "test_macros.h" |
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| 23 | |
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| 24 | template <class T, class = decltype(std::tuple_size<T>::value)> |
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| 25 | constexpr bool has_value(int) { return true; } |
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| 26 | template <class> constexpr bool has_value(long) { return false; } |
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| 27 | template <class T> constexpr bool has_value() { return has_value<T>(0); } |
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| 28 | |
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| 29 | struct Dummy {}; |
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| 30 | |
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| 31 | int main(int, char**) { |
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| 32 | // Test that the ::value member does not exist |
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| 33 | static_assert(has_value<std::tuple<int> const>(), "" ); |
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| 34 | static_assert(has_value<std::pair<int, long> volatile>(), "" ); |
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| 35 | static_assert(!has_value<int>(), "" ); |
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| 36 | static_assert(!has_value<const int>(), "" ); |
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| 37 | static_assert(!has_value<volatile void>(), "" ); |
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| 38 | static_assert(!has_value<const volatile std::tuple<int>&>(), "" ); |
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| 39 | |
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| 40 | return 0; |
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| 41 | } |
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| 42 | |
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