tests/intrusive_shared_ptr_src/cast.static.cpp

   1 //
   2 // Tests for
   3 //  template<typename To, typename From, typename R>
   4 //  intrusive_shared_ptr<To, R> static_pointer_cast(intrusive_shared_ptr<From, R> const& ptr) noexcept;
   5 //
   6 //  template<typename To, typename From, typename R>
   7 //  intrusive_shared_ptr<To, R> static_pointer_cast(intrusive_shared_ptr<From, R>&& ptr) noexcept
   8 //
   9
  10 #include <libkern/c++/intrusive_shared_ptr.h>
  11 #include <utility>
  12 #include <darwintest.h>
  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 template <typename Stored, typename From, typename To>
  27 static void
  28 tests()
  29 {
  30         Stored obj{3};
  31
  32         {
  33                 tracked_shared_ptr<From> const from(&obj, libkern::no_retain);
  34                 tracking_policy::reset();
  35                 tracked_shared_ptr<To> to = libkern::static_pointer_cast<To>(from);
  36                 CHECK(tracking_policy::retains == 1);
  37                 CHECK(tracking_policy::releases == 0);
  38                 CHECK(to.get() == static_cast<To const*>(&obj));
  39                 CHECK(from.get() == &obj);
  40         }
  41         {
  42                 tracked_shared_ptr<From> from(&obj, libkern::no_retain);
  43                 tracking_policy::reset();
  44                 tracked_shared_ptr<To> to = libkern::static_pointer_cast<To>(std::move(from));
  45                 CHECK(tracking_policy::retains == 0);
  46                 CHECK(tracking_policy::releases == 0);
  47                 CHECK(to.get() == static_cast<To const*>(&obj));
  48                 CHECK(from.get() == nullptr);
  49         }
  50
  51         // Test `static_pointer_cast`ing a null pointer
  52         {
  53                 tracked_shared_ptr<From> const from = nullptr;
  54                 tracking_policy::reset();
  55                 tracked_shared_ptr<To> to = libkern::static_pointer_cast<To>(from);
  56                 CHECK(tracking_policy::retains == 0);
  57                 CHECK(tracking_policy::releases == 0);
  58                 CHECK(to.get() == nullptr);
  59                 CHECK(from.get() == nullptr);
  60         }
  61         {
  62                 tracked_shared_ptr<From> from = nullptr;
  63                 tracking_policy::reset();
  64                 tracked_shared_ptr<To> to = libkern::static_pointer_cast<To>(std::move(from));
  65                 CHECK(tracking_policy::retains == 0);
  66                 CHECK(tracking_policy::releases == 0);
  67                 CHECK(to.get() == nullptr);
  68                 CHECK(from.get() == nullptr);
  69         }
  70 }
  71
  72 T_DECL(cast_static, "intrusive_shared_ptr.cast.static") {
  73         tests</*stored*/ Derived, /*from*/ Derived, /*to*/ Base>();
  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 }