1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// <tuple>
// template <class... Types> class tuple;
// template <size_t I, class... Types>
// class tuple_element<I, tuple<Types...> >
// {
// public:
// typedef Ti type;
// };
#include <tuple>
#include <type_traits>
template <class T, std::size_t N, class U>
void test()
{
static_assert((std::is_same<typename std::tuple_element<N, T>::type, U>::value), "");
static_assert((std::is_same<typename std::tuple_element<N, const T>::type, const U>::value), "");
static_assert((std::is_same<typename std::tuple_element<N, volatile T>::type, volatile U>::value), "");
static_assert((std::is_same<typename std::tuple_element<N, const volatile T>::type, const volatile U>::value), "");
#if _LIBCPP_STD_VER > 11
static_assert((std::is_same<typename std::tuple_element_t<N, T>, U>::value), "");
static_assert((std::is_same<typename std::tuple_element_t<N, const T>, const U>::value), "");
static_assert((std::is_same<typename std::tuple_element_t<N, volatile T>, volatile U>::value), "");
static_assert((std::is_same<typename std::tuple_element_t<N, const volatile T>, const volatile U>::value), "");
#endif
}
int main()
{
test<std::tuple<int>, 0, int>();
test<std::tuple<char, int>, 0, char>();
test<std::tuple<char, int>, 1, int>();
test<std::tuple<int*, char, int>, 0, int*>();
test<std::tuple<int*, char, int>, 1, char>();
test<std::tuple<int*, char, int>, 2, int>();
}
|
