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