1//===----------------------------------------------------------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is dual licensed under the MIT and the University of Illinois Open 6// Source Licenses. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9 10// <tuple> 11 12// template <class... Types> class tuple; 13 14// template <class... Types> 15// class tuple_size<tuple<Types...>> 16// : public integral_constant<size_t, sizeof...(Types)> { }; 17 18// UNSUPPORTED: c++98, c++03 19 20#include <tuple> 21#include <type_traits> 22 23template <class T, std::size_t N> 24void test() 25{ 26 static_assert((std::is_base_of<std::integral_constant<std::size_t, N>, 27 std::tuple_size<T> >::value), ""); 28 static_assert((std::is_base_of<std::integral_constant<std::size_t, N>, 29 std::tuple_size<const T> >::value), ""); 30 static_assert((std::is_base_of<std::integral_constant<std::size_t, N>, 31 std::tuple_size<volatile T> >::value), ""); 32 static_assert((std::is_base_of<std::integral_constant<std::size_t, N>, 33 std::tuple_size<const volatile T> >::value), ""); 34} 35 36int main() 37{ 38 test<std::tuple<>, 0>(); 39 test<std::tuple<int>, 1>(); 40 test<std::tuple<char, int>, 2>(); 41 test<std::tuple<char, char*, int>, 3>(); 42} 43