76 lines
2.3 KiB
C++
76 lines
2.3 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
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// UNSUPPORTED: c++98, c++03, c++11, c++14
|
|
|
|
// <utility>
|
|
|
|
// struct in_place_t {
|
|
// explicit in_place_t() = default;
|
|
// };
|
|
// inline constexpr in_place_t in_place{};
|
|
|
|
// template <class T>
|
|
// struct in_place_type_t {
|
|
// explicit in_place_type_t() = default;
|
|
// };
|
|
// template <class T>
|
|
// inline constexpr in_place_type_t<T> in_place_type{};
|
|
|
|
// template <size_t I>
|
|
// struct in_place_index_t {
|
|
// explicit in_place_index_t() = default;
|
|
// };
|
|
// template <size_t I>
|
|
// inline constexpr in_place_index_t<I> in_place_index{};
|
|
|
|
#include <utility>
|
|
#include <cassert>
|
|
#include <memory>
|
|
|
|
#include "test_macros.h"
|
|
#include "type_id.h"
|
|
|
|
template <class Tp, class Up>
|
|
constexpr bool check_tag(Up) {
|
|
return std::is_same<Tp, std::decay_t<Tp>>::value
|
|
&& std::is_same<Tp, Up>::value;
|
|
}
|
|
|
|
int main(int, char**) {
|
|
// test in_place_t
|
|
{
|
|
using T = std::in_place_t;
|
|
static_assert(check_tag<T>(std::in_place));
|
|
}
|
|
// test in_place_type_t
|
|
{
|
|
using T1 = std::in_place_type_t<void>;
|
|
using T2 = std::in_place_type_t<int>;
|
|
using T3 = std::in_place_type_t<const int>;
|
|
static_assert(!std::is_same<T1, T2>::value && !std::is_same<T1, T3>::value);
|
|
static_assert(!std::is_same<T2, T3>::value);
|
|
static_assert(check_tag<T1>(std::in_place_type<void>));
|
|
static_assert(check_tag<T2>(std::in_place_type<int>));
|
|
static_assert(check_tag<T3>(std::in_place_type<const int>));
|
|
}
|
|
// test in_place_index_t
|
|
{
|
|
using T1 = std::in_place_index_t<0>;
|
|
using T2 = std::in_place_index_t<1>;
|
|
using T3 = std::in_place_index_t<static_cast<size_t>(-1)>;
|
|
static_assert(!std::is_same<T1, T2>::value && !std::is_same<T1, T3>::value);
|
|
static_assert(!std::is_same<T2, T3>::value);
|
|
static_assert(check_tag<T1>(std::in_place_index<0>));
|
|
static_assert(check_tag<T2>(std::in_place_index<1>));
|
|
static_assert(check_tag<T3>(std::in_place_index<static_cast<size_t>(-1)>));
|
|
}
|
|
|
|
return 0;
|
|
}
|