tests/intrusive_shared_ptr_src/ctor.copy.cpp

   1 //
   2 // Tests for
   3 //  template <typename U>
   4 //  intrusive_shared_ptr(intrusive_shared_ptr<U, RefcountPolicy> const& other);
   5 //
   6 //  intrusive_shared_ptr(intrusive_shared_ptr const& 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 "test_policy.h"
  14
  15 struct Base { int i; };
  16 struct Derived : Base { };
  17
  18 struct Base1 { int i; };
  19 struct Base2 { long l; };
  20 struct DerivedMultiple : Base1, Base2 {
  21         DerivedMultiple(int i) : Base1{i}, Base2{i + 10}
  22         {
  23         }
  24 };
  25
  26 struct Unrelated { };
  27
  28 template <typename Stored, typename From, typename To>
  29 static void
  30 tests()
  31 {
  32         Stored obj{3};
  33
  34         // Test with non-null pointers
  35         {
  36                 test_policy::retain_count = 0;
  37                 libkern::intrusive_shared_ptr<From, test_policy> const from(&obj, libkern::retain);
  38                 libkern::intrusive_shared_ptr<To, test_policy> to(from); // explicit
  39                 CHECK(test_policy::retain_count == 2);
  40                 CHECK(to.get() == &obj);
  41         }
  42         {
  43                 test_policy::retain_count = 0;
  44                 libkern::intrusive_shared_ptr<From, test_policy> const from(&obj, libkern::retain);
  45                 libkern::intrusive_shared_ptr<To, test_policy> to{from}; // explicit
  46                 CHECK(test_policy::retain_count == 2);
  47                 CHECK(to.get() == &obj);
  48         }
  49         {
  50                 test_policy::retain_count = 0;
  51                 libkern::intrusive_shared_ptr<From, test_policy> const from(&obj, libkern::retain);
  52                 libkern::intrusive_shared_ptr<To, test_policy> to = from; // implicit
  53                 CHECK(test_policy::retain_count == 2);
  54                 CHECK(to.get() == &obj);
  55         }
  56
  57         // Test with a null pointer
  58         {
  59                 test_policy::retain_count = 0;
  60                 libkern::intrusive_shared_ptr<From, test_policy> const from = nullptr;
  61                 libkern::intrusive_shared_ptr<To, test_policy> to = from;
  62                 CHECK(test_policy::retain_count == 0);
  63                 CHECK(to.get() == nullptr);
  64         }
  65 }
  66
  67 T_DECL(ctor_copy, "intrusive_shared_ptr.ctor.copy") {
  68         tests</*stored*/ Derived, /*from*/ Derived, /*to*/ Derived>();
  69         tests</*stored*/ Derived, /*from*/ Derived, /*to*/ Derived const>();
  70         tests</*stored*/ Derived, /*from*/ Derived const, /*to*/ Derived const>();
  71
  72         tests</*stored*/ Derived, /*from*/ Derived, /*to*/ Base>();
  73         tests</*stored*/ Derived, /*from*/ Derived, /*to*/ Base const>();
  74         tests</*stored*/ Derived, /*from*/ Derived const, /*to*/ Base const>();
  75
  76         tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple, /*to*/ Base1>();
  77         tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple const, /*to*/ Base1 const>();
  78
  79         tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple, /*to*/ Base2>();
  80         tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple const, /*to*/ Base2 const>();
  81
  82         // Make sure basic trait querying works
  83         static_assert(std::is_copy_constructible_v<test_shared_ptr<Derived> >);
  84
  85         // Make sure downcasts are disabled
  86         static_assert(!std::is_constructible_v</*to*/ test_shared_ptr<Derived>, /*from*/ test_shared_ptr<Base> const&>);
  87         static_assert(!std::is_constructible_v</*to*/ test_shared_ptr<DerivedMultiple>, /*from*/ test_shared_ptr<Base1> const&>);
  88         static_assert(!std::is_constructible_v</*to*/ test_shared_ptr<DerivedMultiple>, /*from*/ test_shared_ptr<Base2> const&>);
  89         static_assert(!std::is_constructible_v</*to*/ test_shared_ptr<Base2>, /*from*/ test_shared_ptr<Base1> const&>);
  90
  91         // Make sure const-casting away doesn't work
  92         static_assert(!std::is_constructible_v</*to*/ test_shared_ptr<Derived>, /*from*/ test_shared_ptr<Derived const> const&>);
  93
  94         // Make sure casting to unrelated types doesn't work
  95         static_assert(!std::is_constructible_v</*to*/ test_shared_ptr<char>, /*from*/ test_shared_ptr<Derived> const&>);
  96         static_assert(!std::is_constructible_v</*to*/ test_shared_ptr<Unrelated>, /*from*/ test_shared_ptr<Derived> const&>);
  97         static_assert(!std::is_constructible_v</*to*/ test_shared_ptr<Base2>, /*from*/ test_shared_ptr<Base1> const&>);
  98
  99         // Make sure constructing with different policies doesn't work
 100         static_assert(!std::is_constructible_v</*to*/ libkern::intrusive_shared_ptr<Derived, dummy_policy<2> >, /*from*/ libkern::intrusive_shared_ptr<Derived, dummy_policy<1> > const &>);
 101 }