You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
54 lines
2.2 KiB
C++
54 lines
2.2 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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 <class... Types>
|
|
// class tuple_size<tuple<Types...>>
|
|
// : public integral_constant<size_t, sizeof...(Types)> { };
|
|
//
|
|
// LWG #2212 says that tuple_size and tuple_element must be
|
|
// available after including <utility>
|
|
|
|
#include <cstddef>
|
|
#include <utility>
|
|
#include <type_traits>
|
|
|
|
#include "test_macros.h"
|
|
|
|
template <class T, std::size_t N, class U, 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::pair<int, int>, 2, int, 0>();
|
|
test<std::pair<int, int>, 2, int, 1>();
|
|
test<std::pair<const int, int>, 2, int, 1>();
|
|
test<std::pair<int, volatile int>, 2, volatile int, 1>();
|
|
test<std::pair<char *, int>, 2, char *, 0>();
|
|
test<std::pair<char *, int>, 2, int, 1>();
|
|
|
|
return 0;
|
|
}
|