tests/bounded_ptr_src/reinterpret_cast.cpp

   1 //
   2 // Tests for
   3 //  template <typename T, typename U, typename Policy>
   4 //  bounded_ptr<T, Policy> reinterpret_pointer_cast(bounded_ptr<U, Policy> const& p) noexcept
   5 //
   6
   7 #include <libkern/c++/bounded_ptr.h>
   8 #include <array>
   9 #include <darwintest.h>
  10 #include <darwintest_utils.h>
  11 #include "test_utils.h"
  12
  13 #define _assert(...) T_ASSERT_TRUE((__VA_ARGS__), # __VA_ARGS__)
  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 non_default_policy {
  27         static constexpr void
  28         trap(char const*)
  29         {
  30         }
  31 };
  32
  33 template <typename Stored, typename From, typename To>
  34 static void
  35 tests()
  36 {
  37         std::array<Stored, 5> array = {Stored{0}, Stored{1}, Stored{2}, Stored{3}, Stored{4}};
  38
  39         {
  40                 test_bounded_ptr<From> from(array.begin() + 2, array.begin(), array.end());
  41                 test_bounded_ptr<To> to = libkern::reinterpret_pointer_cast<To>(from);
  42                 _assert(to.discard_bounds() == reinterpret_cast<To const*>(from.discard_bounds()));
  43         }
  44
  45         {
  46                 test_bounded_ptr<From> from(array.begin() + 2, array.begin(), array.end());
  47                 test_bounded_ptr<To> to = libkern::reinterpret_pointer_cast<To>(from);
  48                 _assert(to.discard_bounds() == reinterpret_cast<To const volatile*>(from.discard_bounds()));
  49         }
  50
  51         // Test `reinterpret_pointer_cast`ing a null pointer
  52         {
  53                 test_bounded_ptr<From> from(nullptr, nullptr, nullptr);
  54                 test_bounded_ptr<To> to = libkern::reinterpret_pointer_cast<To>(from);
  55                 _assert(to.unsafe_discard_bounds() == nullptr);
  56         }
  57
  58         // Test with a non-default policy
  59         {
  60                 libkern::bounded_ptr<From, non_default_policy> from(array.begin(), array.begin(), array.end());
  61                 libkern::bounded_ptr<To, non_default_policy> to = libkern::reinterpret_pointer_cast<To>(from);
  62                 _assert(to.discard_bounds() == reinterpret_cast<To const*>(from.discard_bounds()));
  63         }
  64 }
  65
  66 T_DECL(reinterpret_cast_, "bounded_ptr.reinterpret_cast") {
  67         tests</*stored*/ Derived, /*from*/ Derived, /*to*/ Base>();
  68         tests</*stored*/ Derived, /*from*/ Derived const, /*to*/ Base const>();
  69         tests</*stored*/ Derived, /*from*/ Derived volatile, /*to*/ Base volatile>();
  70         tests</*stored*/ Derived, /*from*/ Derived const volatile, /*to*/ Base const volatile>();
  71
  72         tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple, /*to*/ Base1>();
  73         tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple const, /*to*/ Base1 const>();
  74         tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple volatile, /*to*/ Base1 volatile>();
  75         tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple const volatile, /*to*/ Base1 const volatile>();
  76
  77         tests</*stored*/ Derived, /*from*/ Derived, /*to*/ void>();
  78         tests</*stored*/ Derived, /*from*/ Derived const, /*to*/ void const>();
  79         tests</*stored*/ Derived, /*from*/ Derived volatile, /*to*/ void volatile>();
  80         tests</*stored*/ Derived, /*from*/ Derived const volatile, /*to*/ void const volatile>();
  81
  82         tests</*stored*/ Derived, /*from*/ Derived, /*to*/ char>();
  83         tests</*stored*/ Derived, /*from*/ Derived const, /*to*/ char const>();
  84         tests</*stored*/ Derived, /*from*/ Derived volatile, /*to*/ char volatile>();
  85         tests</*stored*/ Derived, /*from*/ Derived const volatile, /*to*/ char const volatile>();
  86 }