1 //
2 // Tests for
3 // template <typename U>
4 // intrusive_shared_ptr(intrusive_shared_ptr<U, RefcountPolicy>&& other);
5 //
6 // intrusive_shared_ptr(intrusive_shared_ptr&& other);
7 //
8
9 #include <libkern/c++/intrusive_shared_ptr.h>
10 #include <darwintest.h>
11 #include <darwintest_utils.h>
12 #include <type_traits>
13 #include <utility>
14 #include "test_policy.h"
15
16 struct Base { int i; };
17 struct Derived : Base { };
18
19 struct Base1 { int i; };
20 struct Base2 { long l; };
21 struct DerivedMultiple : Base1, Base2 {
DerivedMultipleDerivedMultiple22 DerivedMultiple(int i) : Base1{i}, Base2{i + 10}
23 {
24 }
25 };
26
27 struct Unrelated { };
28
29 template <typename Stored, typename From, typename To>
30 static void
tests()31 tests()
32 {
33 Stored obj{3};
34
35 // Test with non-null pointers
36 {
37 test_policy::retain_count = 0;
38 libkern::intrusive_shared_ptr<From, test_policy> from(&obj, libkern::retain);
39 CHECK(test_policy::retain_count == 1);
40 CHECK(from.get() == &obj);
41
42 libkern::intrusive_shared_ptr<To, test_policy> to(std::move(from)); // explicit
43 CHECK(test_policy::retain_count == 1);
44 CHECK(to.get() == &obj);
45 CHECK(from.get() == nullptr);
46 }
47 {
48 test_policy::retain_count = 0;
49 libkern::intrusive_shared_ptr<From, test_policy> from(&obj, libkern::retain);
50 CHECK(test_policy::retain_count == 1);
51 CHECK(from.get() == &obj);
52
53 libkern::intrusive_shared_ptr<To, test_policy> to{std::move(from)}; // explicit
54 CHECK(test_policy::retain_count == 1);
55 CHECK(to.get() == &obj);
56 CHECK(from.get() == nullptr);
57 }
58 {
59 test_policy::retain_count = 0;
60 libkern::intrusive_shared_ptr<From, test_policy> from(&obj, libkern::retain);
61 CHECK(test_policy::retain_count == 1);
62 CHECK(from.get() == &obj);
63
64 libkern::intrusive_shared_ptr<To, test_policy> to = std::move(from); // implicit
65 CHECK(test_policy::retain_count == 1);
66 CHECK(to.get() == &obj);
67 CHECK(from.get() == nullptr);
68 }
69
70 // Test with a null pointer
71 {
72 test_policy::retain_count = 3;
73 libkern::intrusive_shared_ptr<From, test_policy> from = nullptr;
74 libkern::intrusive_shared_ptr<To, test_policy> to = std::move(from);
75 CHECK(test_policy::retain_count == 3);
76 CHECK(to.get() == nullptr);
77 CHECK(from.get() == nullptr);
78 }
79 }
80
81 T_DECL(ctor_move, "intrusive_shared_ptr.ctor.move", T_META_TAG_VM_PREFERRED) {
82 tests</*stored*/ Derived, /*from*/ Derived, /*to*/ Derived>();
83 tests</*stored*/ Derived, /*from*/ Derived, /*to*/ Derived const>();
84 tests</*stored*/ Derived, /*from*/ Derived const, /*to*/ Derived const>();
85
86 tests</*stored*/ Derived, /*from*/ Derived, /*to*/ Base>();
87 tests</*stored*/ Derived, /*from*/ Derived, /*to*/ Base const>();
88 tests</*stored*/ Derived, /*from*/ Derived const, /*to*/ Base const>();
89
90 tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple, /*to*/ Base1>();
91 tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple const, /*to*/ Base1 const>();
92
93 tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple, /*to*/ Base2>();
94 tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple const, /*to*/ Base2 const>();
95
96 // Make sure basic trait querying works
97 static_assert(std::is_move_constructible_v<test_shared_ptr<Derived> >);
98
99 // Make sure downcasts are disabled
100 static_assert(!std::is_constructible_v</*to*/ test_shared_ptr<Derived>, /*from*/ test_shared_ptr<Base>&&>);
101 static_assert(!std::is_constructible_v</*to*/ test_shared_ptr<DerivedMultiple>, /*from*/ test_shared_ptr<Base1>&&>);
102 static_assert(!std::is_constructible_v</*to*/ test_shared_ptr<DerivedMultiple>, /*from*/ test_shared_ptr<Base2>&&>);
103 static_assert(!std::is_constructible_v</*to*/ test_shared_ptr<Base2>, /*from*/ test_shared_ptr<Base1>&&>);
104
105 // Make sure const-casting away doesn't work
106 static_assert(!std::is_constructible_v</*to*/ test_shared_ptr<Derived>, /*from*/ test_shared_ptr<Derived const>&&>);
107
108 // Make sure casting to unrelated types doesn't work
109 static_assert(!std::is_constructible_v</*to*/ test_shared_ptr<char>, /*from*/ test_shared_ptr<Derived>&&>);
110 static_assert(!std::is_constructible_v</*to*/ test_shared_ptr<Unrelated>, /*from*/ test_shared_ptr<Derived>&&>);
111 static_assert(!std::is_constructible_v</*to*/ test_shared_ptr<Base2>, /*from*/ test_shared_ptr<Base1>&&>);
112
113 // Make sure constructing with different policies doesn't work
114 static_assert(!std::is_constructible_v</*to*/ libkern::intrusive_shared_ptr<Derived, dummy_policy<2> >, /*from*/ libkern::intrusive_shared_ptr<Derived, dummy_policy<1> >&&>);
115 }
116