tuple_element.pass.cpp revision 86ed8aefb29692a231ce218815ad1077f2329cc5
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 <size_t I, class... Types> 15// class tuple_element<I, tuple<Types...> > 16// { 17// public: 18// typedef Ti type; 19// }; 20 21#include <tuple> 22#include <type_traits> 23 24template <class T, std::size_t N, class U> 25void test() 26{ 27 static_assert((std::is_same<typename std::tuple_element<N, T>::type, U>::value), ""); 28 static_assert((std::is_same<typename std::tuple_element<N, const T>::type, const U>::value), ""); 29 static_assert((std::is_same<typename std::tuple_element<N, volatile T>::type, volatile U>::value), ""); 30 static_assert((std::is_same<typename std::tuple_element<N, const volatile T>::type, const volatile U>::value), ""); 31} 32int main() 33{ 34 test<std::tuple<int>, 0, int>(); 35 test<std::tuple<char, int>, 0, char>(); 36 test<std::tuple<char, int>, 1, int>(); 37 test<std::tuple<int*, char, int>, 0, int*>(); 38 test<std::tuple<int*, char, int>, 1, char>(); 39 test<std::tuple<int*, char, int>, 2, int>(); 40} 41