tests/intrusive_shared_ptr_src/ctor.move.cpp

   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 {
  22         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
  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") {
  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 }