| 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 <type_traits> |
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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, std::size_t N> |
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| 25 | void test() |
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| 26 | { |
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| 27 | static_assert((std::is_base_of<std::integral_constant<std::size_t, N>, |
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| 28 | std::tuple_size<T> >::value), "" ); |
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| 29 | static_assert((std::is_base_of<std::integral_constant<std::size_t, N>, |
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| 30 | std::tuple_size<const T> >::value), "" ); |
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| 31 | static_assert((std::is_base_of<std::integral_constant<std::size_t, N>, |
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| 32 | std::tuple_size<volatile T> >::value), "" ); |
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| 33 | static_assert((std::is_base_of<std::integral_constant<std::size_t, N>, |
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| 34 | std::tuple_size<const volatile T> >::value), "" ); |
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| 35 | } |
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| 36 | |
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| 37 | int main(int, char**) |
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| 38 | { |
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| 39 | test<std::tuple<>, 0>(); |
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| 40 | test<std::tuple<int>, 1>(); |
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| 41 | test<std::tuple<char, int>, 2>(); |
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| 42 | test<std::tuple<char, char*, int>, 3>(); |
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| 43 | |
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| 44 | return 0; |
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| 45 | } |
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| 46 | |
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