41 lines
1.4 KiB
C++
41 lines
1.4 KiB
C++
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//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <tuple>
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// template <class... Types> class tuple;
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// template <class... Types>
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// class tuple_size<tuple<Types...>>
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// : public integral_constant<size_t, sizeof...(Types)> { };
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#include <tuple>
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#include <type_traits>
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template <class T, std::size_t N>
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void test()
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{
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static_assert((std::is_base_of<std::integral_constant<std::size_t, N>,
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std::tuple_size<T> >::value), "");
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static_assert((std::is_base_of<std::integral_constant<std::size_t, N>,
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std::tuple_size<const T> >::value), "");
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static_assert((std::is_base_of<std::integral_constant<std::size_t, N>,
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std::tuple_size<volatile T> >::value), "");
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static_assert((std::is_base_of<std::integral_constant<std::size_t, N>,
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std::tuple_size<const volatile T> >::value), "");
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}
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int main()
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{
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test<std::tuple<>, 0>();
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test<std::tuple<int>, 1>();
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test<std::tuple<char, int>, 2>();
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test<std::tuple<char, char*, int>, 3>();
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}
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