tests/intrusive_shared_ptr_src/cast.const.cpp

   1 //
   2 // Tests for
   3 //  template<typename To, typename From, typename R>
   4 //  intrusive_shared_ptr<To, R> const_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> const_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 T { int i; };
  16
  17 template <typename Stored, typename From, typename To>
  18 static void
  19 tests()
  20 {
  21         Stored obj{3};
  22
  23         {
  24                 tracked_shared_ptr<From> const from(&obj, libkern::no_retain);
  25                 tracking_policy::reset();
  26                 tracked_shared_ptr<To> to = libkern::const_pointer_cast<To>(from);
  27                 CHECK(tracking_policy::retains == 1);
  28                 CHECK(tracking_policy::releases == 0);
  29                 CHECK(to.get() == const_cast<To*>(&obj));
  30                 CHECK(from.get() == &obj);
  31         }
  32         {
  33                 tracked_shared_ptr<From> from(&obj, libkern::no_retain);
  34                 tracking_policy::reset();
  35                 tracked_shared_ptr<To> to = libkern::const_pointer_cast<To>(std::move(from));
  36                 CHECK(tracking_policy::retains == 0);
  37                 CHECK(tracking_policy::releases == 0);
  38                 CHECK(to.get() == const_cast<To*>(&obj));
  39                 CHECK(from.get() == nullptr);
  40         }
  41
  42         // Test `const_pointer_cast`ing a null pointer
  43         {
  44                 tracked_shared_ptr<From> const from = nullptr;
  45                 tracking_policy::reset();
  46                 tracked_shared_ptr<To> to = libkern::const_pointer_cast<To>(from);
  47                 CHECK(tracking_policy::retains == 0);
  48                 CHECK(tracking_policy::releases == 0);
  49                 CHECK(to.get() == nullptr);
  50                 CHECK(from.get() == nullptr);
  51         }
  52         {
  53                 tracked_shared_ptr<From> from = nullptr;
  54                 tracking_policy::reset();
  55                 tracked_shared_ptr<To> to = libkern::const_pointer_cast<To>(std::move(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
  63 T_DECL(cast_const, "intrusive_shared_ptr.cast.const") {
  64         tests</*stored*/ T, /*from*/ T, /*to*/ T>();
  65         tests</*stored*/ T, /*from*/ T, /*to*/ T const>();
  66         tests</*stored*/ T, /*from*/ T const, /*to*/ T>();
  67 }