xnu-7195.50.7.100.1.tar.gz

[apple/xnu.git] / tests / bounded_ptr_src / assign.convert.cpp

diff --git a/tests/bounded_ptr_src/assign.convert.cpp b/tests/bounded_ptr_src/assign.convert.cpp
new file mode 100644 (file)
index 0000000..379745d
--- /dev/null
+++ b/tests/bounded_ptr_src/assign.convert.cpp
@@ -0,0 +1,140 @@
+//
+// Tests for
+//  template <typename U, typename Policy>
+//  bounded_ptr& operator=(bounded_ptr<U, Policy> const& other);
+//
+
+#include <libkern/c++/bounded_ptr.h>
+#include <array>
+#include <darwintest.h>
+#include <darwintest_utils.h>
+#include "test_utils.h"
+
+#define _assert(...) T_ASSERT_TRUE((__VA_ARGS__), # __VA_ARGS__)
+
+struct Base { int i; };
+struct Derived : Base { };
+
+struct Base1 { int i; };
+struct Base2 { long l; };
+struct DerivedMultiple : Base1, Base2 {
+       DerivedMultiple(int i) : Base1{i}, Base2{i + 10}
+       {
+       }
+};
+
+struct Unrelated { };
+
+struct dummy_policy1 {
+       static constexpr void
+       trap(char const*)
+       {
+       }
+};
+struct dummy_policy2 {
+       static constexpr void
+       trap(char const*)
+       {
+       }
+};
+
+template <typename Stored, typename From, typename To>
+static void
+tests()
+{
+       std::array<Stored, 5> array = {Stored{0}, Stored{1}, Stored{2}, Stored{3}, Stored{4}};
+       Stored* const ptr1 = array.begin() + 2;
+       Stored* const ptr2 = array.begin() + 3;
+
+       {
+               test_bounded_ptr<From> const from(ptr1, array.begin(), array.end());
+               test_bounded_ptr<To> to;
+               test_bounded_ptr<To>& ref = (to = from);
+               _assert(to.discard_bounds() == static_cast<To const*>(ptr1));
+               _assert(&ref == &to); // make sure we return *this
+       }
+
+       // Test assigning to a non-null pointer
+       {
+               test_bounded_ptr<From> const from(ptr1, array.begin(), array.end());
+               test_bounded_ptr<To> to(ptr2, array.begin(), array.end());
+               _assert(to.discard_bounds() == static_cast<To const*>(ptr2));
+
+               test_bounded_ptr<To>& ref = (to = from);
+               _assert(to.discard_bounds() == static_cast<To const*>(ptr1));
+               _assert(&ref == &to); // make sure we return *this
+       }
+
+       // Test assigning from a null pointer
+       {
+               test_bounded_ptr<From> const from = nullptr;
+               test_bounded_ptr<To> to;
+               test_bounded_ptr<To>& ref = (to = from);
+               _assert(to.unsafe_discard_bounds() == nullptr);
+               _assert(&ref == &to); // make sure we return *this
+       }
+
+       // Test with different policies
+       {
+               libkern::bounded_ptr<From, dummy_policy1> from(ptr1, array.begin(), array.end());
+               libkern::bounded_ptr<To, dummy_policy2> to;
+               libkern::bounded_ptr<To, dummy_policy2>& ref = (to = from);
+               _assert(to.discard_bounds() == static_cast<To const*>(ptr1));
+               _assert(&ref == &to); // make sure we return *this
+       }
+
+       // T{0}     T{1}     T{2}     T{3}     T{4}     <one-past-last>
+       //   ^        ^                                       ^
+       //   |        |                                       |
+       // from     begin                                    end
+       {
+               test_bounded_ptr<From> const from(array.begin(), array.begin() + 1, array.end());
+               test_bounded_ptr<To> to;
+               to = from;
+               _assert(to.unsafe_discard_bounds() == static_cast<To const*>(array.begin()));
+       }
+}
+
+T_DECL(assign_convert, "bounded_ptr.assign.convert") {
+       tests</*stored*/ Derived, /*from*/ Derived, /*to*/ Derived>();
+       tests</*stored*/ Derived, /*from*/ Derived const, /*to*/ Derived const>();
+       tests</*stored*/ Derived, /*from*/ Derived volatile, /*to*/ Derived volatile>();
+       tests</*stored*/ Derived, /*from*/ Derived const volatile, /*to*/ Derived const volatile>();
+
+       tests</*stored*/ Derived, /*from*/ Derived, /*to*/ Base>();
+       tests</*stored*/ Derived, /*from*/ Derived const, /*to*/ Base const>();
+       tests</*stored*/ Derived, /*from*/ Derived volatile, /*to*/ Base volatile>();
+       tests</*stored*/ Derived, /*from*/ Derived const volatile, /*to*/ Base const volatile>();
+
+       tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple, /*to*/ Base1>();
+       tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple const, /*to*/ Base1 const>();
+       tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple volatile, /*to*/ Base1 volatile>();
+       tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple const volatile, /*to*/ Base1 const volatile>();
+
+       tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple, /*to*/ Base2>();
+       tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple const, /*to*/ Base2 const>();
+       tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple volatile, /*to*/ Base2 volatile>();
+       tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple const volatile, /*to*/ Base2 const volatile>();
+
+       tests</*stored*/ Derived, /*from*/ Derived, /*to*/ void>();
+       tests</*stored*/ Derived, /*from*/ Derived const, /*to*/ void const>();
+       tests</*stored*/ Derived, /*from*/ Derived volatile, /*to*/ void volatile>();
+       tests</*stored*/ Derived, /*from*/ Derived const volatile, /*to*/ void const volatile>();
+
+       // Make sure downcasts are disabled
+       static_assert(!std::is_assignable_v</*to*/ test_bounded_ptr<Derived>, /*from*/ test_bounded_ptr<Base> >);
+       static_assert(!std::is_assignable_v</*to*/ test_bounded_ptr<DerivedMultiple>, /*from*/ test_bounded_ptr<Base1> >);
+       static_assert(!std::is_assignable_v</*to*/ test_bounded_ptr<DerivedMultiple>, /*from*/ test_bounded_ptr<Base2> >);
+       static_assert(!std::is_assignable_v</*to*/ test_bounded_ptr<Base2>, /*from*/ test_bounded_ptr<Base1> >);
+
+       // Make sure const-casting away doesn't work
+       static_assert(!std::is_assignable_v</*to*/ test_bounded_ptr<Derived>, /*from*/ test_bounded_ptr<Derived const> >);
+
+       // Make sure casting to unrelated types doesn't work implicitly
+       static_assert(!std::is_assignable_v</*to*/ test_bounded_ptr<char>, /*from*/ test_bounded_ptr<Derived> >);
+       static_assert(!std::is_assignable_v</*to*/ test_bounded_ptr<Unrelated>, /*from*/ test_bounded_ptr<Derived> >);
+       static_assert(!std::is_assignable_v</*to*/ test_bounded_ptr<Base2>, /*from*/ test_bounded_ptr<Base1> >);
+
+       // Make sure we can't assign from raw pointers
+       static_assert(!std::is_assignable_v</*to*/ test_bounded_ptr<Derived>, /*from*/ Derived*>);
+}