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
48
49
50
51
52
53
54
|
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// <tuple>
// template <class... Types> class tuple;
// template <size_t I, class... Types>
// struct tuple_element<I, tuple<Types...> >
// {
// typedef Ti type;
// };
//
// LWG #2212 says that tuple_size and tuple_element must be
// available after including <utility>
#include <array>
#include <type_traits>
#include "test_macros.h"
template <class T, std::size_t N, class U, std::size_t idx>
void test()
{
static_assert((std::is_base_of<std::integral_constant<std::size_t, N>,
std::tuple_size<T> >::value), "");
static_assert((std::is_base_of<std::integral_constant<std::size_t, N>,
std::tuple_size<const T> >::value), "");
static_assert((std::is_base_of<std::integral_constant<std::size_t, N>,
std::tuple_size<volatile T> >::value), "");
static_assert((std::is_base_of<std::integral_constant<std::size_t, N>,
std::tuple_size<const volatile T> >::value), "");
static_assert((std::is_same<typename std::tuple_element<idx, T>::type, U>::value), "");
static_assert((std::is_same<typename std::tuple_element<idx, const T>::type, const U>::value), "");
static_assert((std::is_same<typename std::tuple_element<idx, volatile T>::type, volatile U>::value), "");
static_assert((std::is_same<typename std::tuple_element<idx, const volatile T>::type, const volatile U>::value), "");
}
int main(int, char**)
{
test<std::array<int, 5>, 5, int, 0>();
test<std::array<int, 5>, 5, int, 1>();
test<std::array<const char *, 4>, 4, const char *, 3>();
test<std::array<volatile int, 4>, 4, volatile int, 3>();
test<std::array<char *, 3>, 3, char *, 1>();
test<std::array<char *, 3>, 3, char *, 2>();
return 0;
}
|
