xnu-7195.50.7.100.1.tar.gz

[apple/xnu.git] / tests / intrusive_shared_ptr_src / ctor.copy.cpp

diff --git a/tests/intrusive_shared_ptr_src/ctor.copy.cpp b/tests/intrusive_shared_ptr_src/ctor.copy.cpp
new file mode 100644 (file)
index 0000000..ea2d66c
--- /dev/null
+++ b/tests/intrusive_shared_ptr_src/ctor.copy.cpp
@@ -0,0 +1,101 @@
+//
+// Tests for
+//  template <typename U>
+//  intrusive_shared_ptr(intrusive_shared_ptr<U, RefcountPolicy> const& other);
+//
+//  intrusive_shared_ptr(intrusive_shared_ptr const& other);
+//
+
+#include <libkern/c++/intrusive_shared_ptr.h>
+#include <darwintest.h>
+#include <darwintest_utils.h>
+#include <type_traits>
+#include "test_policy.h"
+
+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 { };
+
+template <typename Stored, typename From, typename To>
+static void
+tests()
+{
+       Stored obj{3};
+
+       // Test with non-null pointers
+       {
+               test_policy::retain_count = 0;
+               libkern::intrusive_shared_ptr<From, test_policy> const from(&obj, libkern::retain);
+               libkern::intrusive_shared_ptr<To, test_policy> to(from); // explicit
+               CHECK(test_policy::retain_count == 2);
+               CHECK(to.get() == &obj);
+       }
+       {
+               test_policy::retain_count = 0;
+               libkern::intrusive_shared_ptr<From, test_policy> const from(&obj, libkern::retain);
+               libkern::intrusive_shared_ptr<To, test_policy> to{from}; // explicit
+               CHECK(test_policy::retain_count == 2);
+               CHECK(to.get() == &obj);
+       }
+       {
+               test_policy::retain_count = 0;
+               libkern::intrusive_shared_ptr<From, test_policy> const from(&obj, libkern::retain);
+               libkern::intrusive_shared_ptr<To, test_policy> to = from; // implicit
+               CHECK(test_policy::retain_count == 2);
+               CHECK(to.get() == &obj);
+       }
+
+       // Test with a null pointer
+       {
+               test_policy::retain_count = 0;
+               libkern::intrusive_shared_ptr<From, test_policy> const from = nullptr;
+               libkern::intrusive_shared_ptr<To, test_policy> to = from;
+               CHECK(test_policy::retain_count == 0);
+               CHECK(to.get() == nullptr);
+       }
+}
+
+T_DECL(ctor_copy, "intrusive_shared_ptr.ctor.copy") {
+       tests</*stored*/ Derived, /*from*/ Derived, /*to*/ Derived>();
+       tests</*stored*/ Derived, /*from*/ Derived, /*to*/ Derived const>();
+       tests</*stored*/ Derived, /*from*/ Derived const, /*to*/ Derived const>();
+
+       tests</*stored*/ Derived, /*from*/ Derived, /*to*/ Base>();
+       tests</*stored*/ Derived, /*from*/ Derived, /*to*/ Base const>();
+       tests</*stored*/ Derived, /*from*/ Derived const, /*to*/ Base const>();
+
+       tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple, /*to*/ Base1>();
+       tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple const, /*to*/ Base1 const>();
+
+       tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple, /*to*/ Base2>();
+       tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple const, /*to*/ Base2 const>();
+
+       // Make sure basic trait querying works
+       static_assert(std::is_copy_constructible_v<test_shared_ptr<Derived> >);
+
+       // Make sure downcasts are disabled
+       static_assert(!std::is_constructible_v</*to*/ test_shared_ptr<Derived>, /*from*/ test_shared_ptr<Base> const&>);
+       static_assert(!std::is_constructible_v</*to*/ test_shared_ptr<DerivedMultiple>, /*from*/ test_shared_ptr<Base1> const&>);
+       static_assert(!std::is_constructible_v</*to*/ test_shared_ptr<DerivedMultiple>, /*from*/ test_shared_ptr<Base2> const&>);
+       static_assert(!std::is_constructible_v</*to*/ test_shared_ptr<Base2>, /*from*/ test_shared_ptr<Base1> const&>);
+
+       // Make sure const-casting away doesn't work
+       static_assert(!std::is_constructible_v</*to*/ test_shared_ptr<Derived>, /*from*/ test_shared_ptr<Derived const> const&>);
+
+       // Make sure casting to unrelated types doesn't work
+       static_assert(!std::is_constructible_v</*to*/ test_shared_ptr<char>, /*from*/ test_shared_ptr<Derived> const&>);
+       static_assert(!std::is_constructible_v</*to*/ test_shared_ptr<Unrelated>, /*from*/ test_shared_ptr<Derived> const&>);
+       static_assert(!std::is_constructible_v</*to*/ test_shared_ptr<Base2>, /*from*/ test_shared_ptr<Base1> const&>);
+
+       // Make sure constructing with different policies doesn't work
+       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 &>);
+}