1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// <memory>
10
11// unique_ptr
12
13// constexpr unique_ptr(nullptr_t); // constexpr since C++23
14
15#include <memory>
16#include <cassert>
17
18#include "test_macros.h"
19#include "unique_ptr_test_helper.h"
20
21#if TEST_STD_VER >= 11
22TEST_CONSTINIT std::unique_ptr<int> global_static_unique_ptr_single(nullptr);
23TEST_CONSTINIT std::unique_ptr<int[]> global_static_unique_ptr_runtime(nullptr);
24
25struct NonDefaultDeleter {
26 NonDefaultDeleter() = delete;
27 void operator()(void*) const {}
28};
29#endif
30
31template <class VT>
32TEST_CONSTEXPR_CXX23 void test_basic() {
33#if TEST_STD_VER >= 11
34 {
35 using U1 = std::unique_ptr<VT>;
36 using U2 = std::unique_ptr<VT, Deleter<VT> >;
37 static_assert(std::is_nothrow_constructible<U1, decltype(nullptr)>::value, "");
38 static_assert(std::is_nothrow_constructible<U2, decltype(nullptr)>::value, "");
39 }
40#endif
41 {
42 std::unique_ptr<VT> p(nullptr);
43 assert(p.get() == 0);
44 }
45 {
46 std::unique_ptr<VT, NCDeleter<VT> > p(nullptr);
47 assert(p.get() == 0);
48 assert(p.get_deleter().state() == 0);
49 }
50 {
51 std::unique_ptr<VT, DefaultCtorDeleter<VT> > p(nullptr);
52 assert(p.get() == 0);
53 assert(p.get_deleter().state() == 0);
54 }
55}
56
57template <class VT>
58TEST_CONSTEXPR_CXX23 void test_sfinae() {
59#if TEST_STD_VER >= 11
60 { // the constructor does not participate in overload resolution when
61 // the deleter is a pointer type
62 using U = std::unique_ptr<VT, void (*)(void*)>;
63 static_assert(!std::is_constructible<U, decltype(nullptr)>::value, "");
64 }
65 { // the constructor does not participate in overload resolution when
66 // the deleter is not default constructible
67 using Del = CDeleter<VT>;
68 using U1 = std::unique_ptr<VT, NonDefaultDeleter>;
69 using U2 = std::unique_ptr<VT, Del&>;
70 using U3 = std::unique_ptr<VT, Del const&>;
71 static_assert(!std::is_constructible<U1, decltype(nullptr)>::value, "");
72 static_assert(!std::is_constructible<U2, decltype(nullptr)>::value, "");
73 static_assert(!std::is_constructible<U3, decltype(nullptr)>::value, "");
74 }
75#endif
76}
77
78DEFINE_AND_RUN_IS_INCOMPLETE_TEST({
79 { doIncompleteTypeTest(0, nullptr); }
80 checkNumIncompleteTypeAlive(0);
81 { doIncompleteTypeTest<IncompleteType, NCDeleter<IncompleteType> >(0, nullptr); }
82 checkNumIncompleteTypeAlive(0);
83 { doIncompleteTypeTest<IncompleteType[]>(0, nullptr); }
84 checkNumIncompleteTypeAlive(0);
85 { doIncompleteTypeTest<IncompleteType[], NCDeleter<IncompleteType[]> >(0, nullptr); }
86 checkNumIncompleteTypeAlive(0);
87})
88
89TEST_CONSTEXPR_CXX23 bool test() {
90 {
91 test_basic<int>();
92 test_sfinae<int>();
93 }
94 {
95 test_basic<int[]>();
96 test_sfinae<int[]>();
97 }
98
99 return true;
100}
101
102int main(int, char**) {
103 test();
104#if TEST_STD_VER >= 23
105 static_assert(test());
106#endif
107
108 return 0;
109}
110

source code of libcxx/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/nullptr.pass.cpp