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 //=============================================================================
14 // TESTING std::unique_ptr::unique_ptr(pointer)
15 //
16 // Concerns:
17 //   1 The pointer constructor works for any default constructible deleter types.
18 //   2 The pointer constructor accepts pointers to derived types.
19 //   2 The stored type 'T' is allowed to be incomplete.
20 //
21 // Plan
22 //  1 Construct unique_ptr<T, D>'s with a pointer to 'T' and various deleter
23 //   types (C-1)
24 //  2 Construct unique_ptr<T, D>'s with a pointer to 'D' and various deleter
25 //    types where 'D' is derived from 'T'. (C-1,2)
26 //  3 Construct a unique_ptr<T, D> with a pointer to 'T' and various deleter
27 //    types where 'T' is an incomplete type (C-1,3)
28 
29 // Test unique_ptr(pointer) ctor
30 
31 #include <memory>
32 #include <cassert>
33 
34 #include "test_macros.h"
35 #include "unique_ptr_test_helper.h"
36 
37 // unique_ptr(pointer) ctor should only require default Deleter ctor
38 
39 template <bool IsArray>
40 void test_pointer() {
41   typedef typename std::conditional<!IsArray, A, A[]>::type ValueT;
42   const int expect_alive = IsArray ? 5 : 1;
43 #if TEST_STD_VER >= 11
44   {
45     using U1 = std::unique_ptr<ValueT>;
46     using U2 = std::unique_ptr<ValueT, Deleter<ValueT> >;
47 
48     // Test for noexcept
49     static_assert(std::is_nothrow_constructible<U1, A*>::value, "");
50     static_assert(std::is_nothrow_constructible<U2, A*>::value, "");
51 
52     // Test for explicit
53     static_assert(!std::is_convertible<A*, U1>::value, "");
54     static_assert(!std::is_convertible<A*, U2>::value, "");
55   }
56 #endif
57   {
58     A* p = newValue<ValueT>(expect_alive);
59     assert(A::count == expect_alive);
60     std::unique_ptr<ValueT> s(p);
61     assert(s.get() == p);
62   }
63   assert(A::count == 0);
64   {
65     A* p = newValue<ValueT>(expect_alive);
66     assert(A::count == expect_alive);
67     std::unique_ptr<ValueT, NCDeleter<ValueT> > s(p);
68     assert(s.get() == p);
69     assert(s.get_deleter().state() == 0);
70   }
71   assert(A::count == 0);
72 }
73 
74 void test_derived() {
75   {
76     B* p = new B;
77     assert(A::count == 1);
78     assert(B::count == 1);
79     std::unique_ptr<A> s(p);
80     assert(s.get() == p);
81   }
82   assert(A::count == 0);
83   assert(B::count == 0);
84   {
85     B* p = new B;
86     assert(A::count == 1);
87     assert(B::count == 1);
88     std::unique_ptr<A, NCDeleter<A> > s(p);
89     assert(s.get() == p);
90     assert(s.get_deleter().state() == 0);
91   }
92   assert(A::count == 0);
93   assert(B::count == 0);
94 }
95 
96 #if TEST_STD_VER >= 11
97 struct NonDefaultDeleter {
98   NonDefaultDeleter() = delete;
99   void operator()(void*) const {}
100 };
101 
102 struct GenericDeleter {
103   void operator()(void*) const;
104 };
105 #endif
106 
107 template <class T>
108 void test_sfinae() {
109 #if TEST_STD_VER >= 11
110   { // the constructor does not participate in overload resolution when
111     // the deleter is a pointer type
112     using U = std::unique_ptr<T, void (*)(void*)>;
113     static_assert(!std::is_constructible<U, T*>::value, "");
114   }
115   { // the constructor does not participate in overload resolution when
116     // the deleter is not default constructible
117     using Del = CDeleter<T>;
118     using U1 = std::unique_ptr<T, NonDefaultDeleter>;
119     using U2 = std::unique_ptr<T, Del&>;
120     using U3 = std::unique_ptr<T, Del const&>;
121     static_assert(!std::is_constructible<U1, T*>::value, "");
122     static_assert(!std::is_constructible<U2, T*>::value, "");
123     static_assert(!std::is_constructible<U3, T*>::value, "");
124   }
125 #endif
126 }
127 
128 static void test_sfinae_runtime() {
129 #if TEST_STD_VER >= 11
130   { // the constructor does not participate in overload resolution when
131     // a base <-> derived conversion would occur.
132     using UA = std::unique_ptr<A[]>;
133     using UAD = std::unique_ptr<A[], GenericDeleter>;
134     using UAC = std::unique_ptr<const A[]>;
135     using UB = std::unique_ptr<B[]>;
136     using UBD = std::unique_ptr<B[], GenericDeleter>;
137     using UBC = std::unique_ptr<const B[]>;
138 
139     static_assert(!std::is_constructible<UA, B*>::value, "");
140     static_assert(!std::is_constructible<UB, A*>::value, "");
141     static_assert(!std::is_constructible<UAD, B*>::value, "");
142     static_assert(!std::is_constructible<UBD, A*>::value, "");
143     static_assert(!std::is_constructible<UAC, const B*>::value, "");
144     static_assert(!std::is_constructible<UBC, const A*>::value, "");
145   }
146 #endif
147 }
148 
149 DEFINE_AND_RUN_IS_INCOMPLETE_TEST({
150   { doIncompleteTypeTest(1, getNewIncomplete()); }
151   checkNumIncompleteTypeAlive(0);
152   {
153     doIncompleteTypeTest<IncompleteType, NCDeleter<IncompleteType> >(
154         1, getNewIncomplete());
155   }
156   checkNumIncompleteTypeAlive(0);
157 })
158 
159 int main(int, char**) {
160   {
161     test_pointer</*IsArray*/ false>();
162     test_derived();
163     test_sfinae<int>();
164   }
165   {
166     test_pointer</*IsArray*/ true>();
167     test_sfinae<int[]>();
168     test_sfinae_runtime();
169   }
170 
171   return 0;
172 }
173