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UnrealEngineUWP/Engine/Source/Runtime/CoreUObject/Tests/ObjectHandleTest.cpp
phillip kavan 91d599b1c4 Create placeholder types/objects for package exports when type imports are missing/unresolved on editor map loads. 
Notes:
- This allows the export to deserialize its tagged property stream (TPS) data into a property bag (when enabled), while also keeping references to the object in place.
- The export can still be serialized to the same package on save with its TPS data still intact. In that case, we will serialize the property bag back into the package as a "normal" TPS data stream.
- Serialized references to placeholder objects are resolved as NULL. For FObjectPtr types, the value is resolved as NULL when dereferenced (for type safety), but is still serialized as a non-NULL reference to the original object (even if placeholder).
- Placeholders will not be created on load unless FUObjectSerializeContext::bSerializeUnknownProperty is set to TRUE in the serialization context. Otherwise, we immediately resolve the export as NULL, and its data is lost on load (previous behavior).

Change summary:
- Added FPropertyBagRepository::PropertyBagTypeRegistry (w/ thread-safe implementation). Currently using ARO to manage placeholder type object lifetime.
- Added FPropertyBagRepository::AddPropertyBagPlaceholderType()/IsPropertyBagPlaceholderType().
- Modified FLinkerLoad::CreateExport() to instance a "placeholder" package/object if the export is missing its type import on load. Otherwise falls back to returning NULL (previous behavior).
- Added UE_WITH_OBJECT_HANDLE_TYPE_SAFETY along with IsObjectHandleTypeSafe().
- Added UE::CoreUObject::Private::HasAnyFlags() to ObjectFwd.h (using int32 for the param here as the enum isn't defined at this level). Similar to internal APIs added for late resolve; avoid having to include Object.h.
- Added RF_HasPlaceholderType (reclaimed an unused bit). This allows FObjectPtr to do a faster query at resolve time for type safety when referencing a placeholder object (i.e. it will return NULL).
- Modified FObjectPtr::Get() and IsNull() variants to include an extra check for type safety. Right now this is only enabled in an editor build context.
- Modified FLinkerLoad::Preload() to narrow the serialization scope to the export's TPS data *only* (since the original base type is unknown, we need to skip any natively-serialized data that might also exist in the stream).
- Modified FLinkerLoad serialization of raw UObject* values to return NULL in the case of a placeholder object (for type safety at runtime).
- Modified FLinkerLoad serialization of FObjectPtr values to return NULL in the case of a placeholder object only if type safety features are disabled on FObjectPtr/FObjectHandle.
- Extended the LowLevel core NULL ptr tests to include additional tests for "unsafe type" objects wrapped by an FObjectPtr/TObjectPtr.

#jira UE-197358
#rb Francis.Hurteau

[CL 31258090 by phillip kavan in ue5-main branch]
2024-02-07 10:34:24 -05:00

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// Copyright Epic Games, Inc. All Rights Reserved.
#if WITH_LOW_LEVEL_TESTS
#include "ObjectPtrTestClass.h"
#include "UObject/ObjectHandle.h"
#include "UObject/ObjectPtr.h"
#include "UObject/Package.h"
#include "UObject/ObjectResource.h"
#include "UObject/MetaData.h"
#include "HAL/PlatformProperties.h"
#include "ObjectRefTrackingTestBase.h"
#include "IO/IoDispatcher.h"
#include "TestHarness.h"
#include "UObject/ObjectRef.h"
#include "UObject/ObjectPathId.h"
static_assert(sizeof(FObjectHandle) == sizeof(void*), "FObjectHandle type must always compile to something equivalent to a pointer size.");
class FObjectHandleTestBase : public FObjectRefTrackingTestBase
{
public:
protected:
#if UE_WITH_OBJECT_HANDLE_LATE_RESOLVE
void TestResolveFailure(UE::CoreUObject::Private::FPackedObjectRef PackedRef)
{
FSnapshotObjectRefMetrics ObjectRefMetrics(*this);
FObjectHandle TargetHandle = { PackedRef.EncodedRef };
UObject* ResolvedObject = FObjectPtr(TargetHandle).Get();
ObjectRefMetrics.TestNumResolves(TEXT("NumResolves should be incremented by one after a resolve attempt"), 1);
ObjectRefMetrics.TestNumReads(TEXT("NumReads should be incremented by one after a resolve attempt"), 1);
CHECK(ResolvedObject == nullptr);
ObjectRefMetrics.TestNumFailedResolves(TEXT("NumFailedResolves should be incremented by one after a failed resolve attempt"), 1);
}
#endif
#if UE_WITH_OBJECT_HANDLE_LATE_RESOLVE || UE_WITH_OBJECT_HANDLE_TRACKING
void TestResolvableNonNull(const ANSICHAR* PackageName, const ANSICHAR* ObjectName, bool bExpectSubRefReads)
{
FSnapshotObjectRefMetrics ObjectRefMetrics(*this);
FObjectRef TargetRef(FName(PackageName), NAME_None, NAME_None, UE::CoreUObject::Private::FObjectPathId(ObjectName));
UObject* ResolvedObject = TargetRef.Resolve();
FObjectPtr Ptr(ResolvedObject);
Ptr.Get();
TEST_TRUE(TEXT("expected not null"), ResolvedObject != nullptr);
ObjectRefMetrics.TestNumResolves(TEXT("NumResolves should be incremented by one after a resolve attempt"), 1);
ObjectRefMetrics.TestNumReads(TEXT("NumReads should be incremented by one after a resolve attempt"), 1, bExpectSubRefReads /*bAllowAdditionalReads*/);
ObjectRefMetrics.TestNumFailedResolves(TEXT("NumFailedResolves should not change after a successful resolve attempt"), 0);
}
void TestResolveFailure(const ANSICHAR* PackageName, const ANSICHAR* ObjectName)
{
FSnapshotObjectRefMetrics ObjectRefMetrics(*this);
FObjectRef TargetRef(FName(PackageName), NAME_None, NAME_None, UE::CoreUObject::Private::FObjectPathId(ObjectName));
const UObject* ResolvedObject = TargetRef.Resolve();
ObjectRefMetrics.TestNumResolves(TEXT("NumResolves should be incremented by one after a resolve attempt"), 1);
ObjectRefMetrics.TestNumReads(TEXT("NumReads should be incremented by one after a resolve attempt"), 1);
CHECK(ResolvedObject == nullptr);
ObjectRefMetrics.TestNumFailedResolves(TEXT("NumFailedResolves should be incremented by one after a failed resolve attempt"), 1);
}
#endif
};
TEST_CASE_METHOD(FObjectHandleTestBase, "CoreUObject::FObjectHandle::Null Behavior", "[CoreUObject][ObjectHandle]")
{
FObjectHandle TargetHandle = UE::CoreUObject::Private::MakeObjectHandle(nullptr);
TEST_TRUE(TEXT("Handle to target is null"), IsObjectHandleNull(TargetHandle));
TEST_TRUE(TEXT("Handle to target is resolved"), IsObjectHandleResolved(TargetHandle));
FSnapshotObjectRefMetrics ObjectRefMetrics(*this);
UObject* ResolvedObject = UE::CoreUObject::Private::ResolveObjectHandle(TargetHandle);
TEST_EQUAL(TEXT("Resolved object is equal to original object"), (UObject*)nullptr, ResolvedObject);
ObjectRefMetrics.TestNumFailedResolves(TEXT("NumFailedResolves should not change after a resolve attempt on a null handle"), 0);
ObjectRefMetrics.TestNumResolves(TEXT("NumResolves should not change after a resolve attempt on a null handle"), 0);
ObjectRefMetrics.TestNumReads(TEXT("NumReads should be incremented by one after a resolve attempt on a null handle"), 1);
}
TEST_CASE_METHOD(FObjectHandleTestBase, "CoreUObject::FObjectHandle::Pointer Behavior", "[CoreUObject][ObjectHandle]")
{
FObjectHandle TargetHandle = UE::CoreUObject::Private::MakeObjectHandle((UObject*)0x0042);
TEST_FALSE(TEXT("Handle to target is null"), IsObjectHandleNull(TargetHandle));
TEST_TRUE(TEXT("Handle to target is resolved"), IsObjectHandleResolved(TargetHandle));
FSnapshotObjectRefMetrics ObjectRefMetrics(*this);
UObject* ResolvedObject = UE::CoreUObject::Private::ResolveObjectHandle(TargetHandle);
TEST_EQUAL(TEXT("Resolved object is equal to original object"), (UObject*)0x0042, ResolvedObject);
ObjectRefMetrics.TestNumResolves(TEXT("NumResolves should not change after a resolve attempt on a pointer handle"), 0);
ObjectRefMetrics.TestNumFailedResolves(TEXT("NumFailedResolves should not change after a resolve attempt on a pointer handle"), 0);
ObjectRefMetrics.TestNumReads(TEXT("NumReads should be incremented by one after a resolve attempt on a pointer handle"),1);
}
#if UE_WITH_OBJECT_HANDLE_LATE_RESOLVE
TEST_CASE_METHOD(FObjectHandleTestBase, "CoreUObject::FObjectHandle::Resolve Engine Content Target", "[CoreUObject][ObjectHandle]")
{
const FName TestPackageName(TEXT("/Engine/Test/ObjectPtrDefaultSerialize/Transient"));
UPackage* TestPackage = NewObject<UPackage>(nullptr, TestPackageName, RF_Transient);
TestPackage->AddToRoot();
UObject* TestSoftObject = NewObject<UObjectPtrTestClass>(TestPackage, TEXT("DefaultSerializeObject"));
UObject* TestSubObject = NewObject<UObjectPtrTestClass>(TestSoftObject, TEXT("SubObject"));
ON_SCOPE_EXIT{
TestPackage->RemoveFromRoot();
};
TestResolvableNonNull("/Engine/Test/ObjectPtrDefaultSerialize/Transient", "DefaultSerializeObject.SubObject", true);
TestResolvableNonNull("/Engine/Test/ObjectPtrDefaultSerialize/Transient", "DefaultSerializeObject", false);
}
// TODO: Disabled until warnings and errors related to loading a non-existent package have been fixed.
DISABLED_TEST_CASE_METHOD(FObjectHandleTestBase, "CoreUObject::FObjectHandle::Resolve Non Existent Target", "[CoreUObject][ObjectHandle]")
{
// Confirm we don't successfully resolve an incorrect reference to engine content
TestResolveFailure("/Engine/EngineResources/NonExistentPackageName_0", "DefaultTexture");
const FName TestPackageName(TEXT("/Engine/Test/ObjectPtrDefaultSerialize/Transient"));
UPackage* TestPackage = NewObject<UPackage>(nullptr, TestPackageName, RF_Transient);
TestPackage->AddToRoot();
UObject* TestSoftObject = NewObject<UObjectPtrTestClass>(TestPackage, TEXT("DefaultSerializeObject"));
ON_SCOPE_EXIT{
TestPackage->RemoveFromRoot();
};
TestResolveFailure("/Engine/Test/ObjectPtrDefaultSerialize/Transient", "DefaultSerializeObject_DoesNotExist");
}
TEST_CASE_METHOD(FObjectHandleTestBase, "CoreUObject::FObjectHandle::Resolve Script Target", "[CoreUObject][ObjectHandle]")
{
// Confirm we successfully resolve a correct reference to engine content
TestResolvableNonNull("/Script/CoreUObject", "MetaData", true);
}
#endif
TEST_CASE_METHOD(FObjectHandleTestBase, "CoreUObject::TObjectPtr::HandleNullGetClass", "[CoreUObject][ObjectHandle]")
{
TObjectPtr<UObject> Ptr = nullptr;
TEST_TRUE(TEXT("TObjectPtr.GetClass should return null on a null object"), Ptr.GetClass() == nullptr);
}
#if UE_WITH_OBJECT_HANDLE_LATE_RESOLVE
TEST_CASE("CoreUObject::FObjectHandle::Names")
{
const FName TestPackageName(TEXT("/Engine/Test/PackageResolve/Transient"));
UPackage* TestPackage = NewObject<UPackage>(nullptr, TestPackageName, RF_Transient);
TestPackage->AddToRoot();
UObject* Obj1 = NewObject<UObjectPtrTestClass>(TestPackage, TEXT("DefaultSerializeObject"));
ON_SCOPE_EXIT{
TestPackage->RemoveFromRoot();
};
FObjectPtr Test;
FObjectPtr PackagePtr(MakeUnresolvedHandle(TestPackage));
FObjectPtr Obj1Ptr(MakeUnresolvedHandle(Obj1));
CHECK(!PackagePtr.IsResolved());
CHECK(TestPackage->GetPathName() == PackagePtr.GetPathName());
CHECK(TestPackage->GetFName() == PackagePtr.GetFName());
CHECK(TestPackage->GetName() == PackagePtr.GetName());
CHECK(TestPackage->GetFullName() == PackagePtr.GetFullName());
CHECK(!PackagePtr.IsResolved());
CHECK(!Obj1Ptr.IsResolved());
CHECK(Obj1->GetPathName() == Obj1Ptr.GetPathName());
CHECK(Obj1->GetFName() == Obj1Ptr.GetFName());
CHECK(Obj1->GetName() == Obj1Ptr.GetName());
CHECK(Obj1->GetFullName() == Obj1Ptr.GetFullName());
CHECK(!Obj1Ptr.IsResolved());
}
#endif
#if UE_WITH_OBJECT_HANDLE_TRACKING || UE_WITH_OBJECT_HANDLE_LATE_RESOLVE
TEST_CASE("CoreUObject::ObjectRef")
{
const FName TestPackageName(TEXT("/Engine/Test/ObjectRef/Transient"));
UPackage* TestPackage = NewObject<UPackage>(nullptr, TestPackageName, RF_Transient);
TestPackage->AddToRoot();
UObject* Obj1 = NewObject<UObjectPtrTestClass>(TestPackage, TEXT("DefaultSerializeObject"));
UObject* Inner1 = NewObject<UObjectPtrTestClass>(Obj1, TEXT("Inner"));
ON_SCOPE_EXIT{
TestPackage->RemoveFromRoot();
};
{
FObjectImport ObjectImport(Obj1);
FObjectRef ObjectRef(Obj1);
CHECK(ObjectImport.ClassPackage == ObjectRef.ClassPackageName);
CHECK(ObjectImport.ClassName == ObjectRef.ClassName);
CHECK(TestPackage->GetFName() == ObjectRef.PackageName);
}
{
FObjectImport ObjectImport(Inner1);
FObjectRef ObjectRef(Inner1);
CHECK(ObjectImport.ClassPackage == ObjectRef.ClassPackageName);
CHECK(ObjectImport.ClassName == ObjectRef.ClassName);
CHECK(TestPackage->GetFName() == ObjectRef.PackageName);
}
}
#endif
#if UE_WITH_OBJECT_HANDLE_LATE_RESOLVE
TEST_CASE_METHOD(FObjectHandleTestBase, "CoreUObject::TObjectPtr::Null Behavior", "[CoreUObject][ObjectHandle]")
{
TObjectPtr<UObject> Ptr = nullptr;
UObjectPtrTestClass* TestObject = nullptr;
uint32 ResolveCount = 0;
auto ResolveDelegate = [&ResolveCount](const FObjectRef& SourceRef, UPackage* ObjectPackage, UObject* Object)
{
++ResolveCount;
};
auto Handle = UE::CoreUObject::AddObjectHandleReferenceResolvedCallback(ResolveDelegate);
ON_SCOPE_EXIT
{
UE::CoreUObject::RemoveObjectHandleReferenceResolvedCallback(Handle);
};
//compare against all flavours of nullptr, should not try and resolve this pointer
CHECK(Ptr == nullptr); CHECK(ResolveCount == 0u);
CHECK(nullptr == Ptr); CHECK(ResolveCount == 0u);
CHECK_FALSE(Ptr != nullptr); CHECK(ResolveCount == 0u);
CHECK_FALSE(nullptr != Ptr); CHECK(ResolveCount == 0u);
CHECK(!Ptr); CHECK(ResolveCount == 0u);
//using an if otherwise the macros try to convert to a pointer and not use the bool operator
if (Ptr)
{
CHECK(false);
}
else
{
CHECK(true);
}
CHECK(ResolveCount == 0u);
CHECK(Ptr == TestObject); CHECK(ResolveCount == 0u);
CHECK(TestObject == Ptr); CHECK(ResolveCount == 0u);
CHECK_FALSE(Ptr != TestObject); CHECK(ResolveCount == 0u);
CHECK_FALSE(TestObject != Ptr); CHECK(ResolveCount == 0u);
FObjectRef TargetRef(FName("SomePackage"), FName("ClassPackageName"), FName("ClassName"), UE::CoreUObject::Private::FObjectPathId("ObjectName"));
UE::CoreUObject::Private::FPackedObjectRef PackedObjectRef = UE::CoreUObject::Private::MakePackedObjectRef(TargetRef);
FObjectPtr ObjectPtr({ PackedObjectRef.EncodedRef });
REQUIRE(!ObjectPtr.IsResolved()); //make sure not resolved
//an unresolved pointers compared against nullptr should still not resolve
Ptr = *reinterpret_cast<TObjectPtr<UObject>*>(&ObjectPtr);
CHECK_FALSE(Ptr == nullptr); CHECK(ResolveCount == 0u);
CHECK_FALSE(nullptr == Ptr); CHECK(ResolveCount == 0u);
CHECK(Ptr != nullptr); CHECK(ResolveCount == 0u);
CHECK(nullptr != Ptr); CHECK(ResolveCount == 0u);
CHECK_FALSE(!Ptr); CHECK(ResolveCount == 0u);
//using an if otherwise the macros try to convert to a pointer and not use the bool operator
if (Ptr)
{
CHECK(true);
}
else
{
CHECK(false);
}
CHECK(ResolveCount == 0u);
//test an unresolve pointer against a null raw pointer
CHECK_FALSE(Ptr == TestObject); CHECK(ResolveCount == 0u);
CHECK_FALSE(TestObject == Ptr); CHECK(ResolveCount == 0u);
CHECK(Ptr != TestObject); CHECK(ResolveCount == 0u);
CHECK(TestObject != Ptr); CHECK(ResolveCount == 0u);
//creating a real object for something that can resolve
const FName TestPackageName(TEXT("/Engine/Test/ObjectPtrDefaultSerialize/Transient"));
UPackage* TestPackage = NewObject<UPackage>(nullptr, TestPackageName, RF_Transient);
TestPackage->AddToRoot();
const FName TestObjectName(TEXT("MyObject"));
TestObject = NewObject<UObjectPtrTestClass>(TestPackage, TestObjectName, RF_Transient);
TObjectPtr<UObject> TestNotLazyObject = NewObject<UObjectPtrNotLazyTestClass>(TestPackage, TEXT("NotLazy"), RF_Transient);
//compare resolved ptr against nullptr
TObjectPtr<UObject> ResolvedPtr = TestObject;
CHECK(ResolvedPtr.IsResolved());
CHECK(Ptr != ResolvedPtr); CHECK(ResolveCount == 0u);
CHECK(ResolvedPtr != Ptr); CHECK(ResolveCount == 0u);
CHECK_FALSE(Ptr == ResolvedPtr); CHECK(ResolveCount == 0u);
CHECK_FALSE(ResolvedPtr == Ptr); CHECK(ResolveCount == 0u);
//compare unresolved against nullptr
FObjectPtr FPtr(MakeUnresolvedHandle(TestObject));
TObjectPtr<UObject> UnResolvedPtr = *reinterpret_cast<TObjectPtr<UObject>*>(&FPtr);
CHECK(!UnResolvedPtr.IsResolved());
CHECK_FALSE(Ptr == UnResolvedPtr); CHECK(ResolveCount == 0u);
CHECK_FALSE(UnResolvedPtr == Ptr); CHECK(ResolveCount == 0u);
CHECK(Ptr != UnResolvedPtr); CHECK(ResolveCount == 0u);
CHECK(UnResolvedPtr != Ptr); CHECK(ResolveCount == 0u);
//compare unresolved against resolved not equal
CHECK_FALSE(TestNotLazyObject == UnResolvedPtr); CHECK(ResolveCount == 0u);
CHECK_FALSE(UnResolvedPtr == TestNotLazyObject); CHECK(ResolveCount == 0u);
CHECK(TestNotLazyObject != UnResolvedPtr); CHECK(ResolveCount == 0u);
CHECK(UnResolvedPtr != TestNotLazyObject); CHECK(ResolveCount == 0u);
//compare resolved against naked pointer
Ptr = TestObject;
REQUIRE(Ptr.IsResolved());
CHECK(Ptr == TestObject); CHECK(ResolveCount == 0u);
CHECK(TestObject == Ptr); CHECK(ResolveCount == 0u);
CHECK_FALSE(Ptr != TestObject); CHECK(ResolveCount == 0u);
CHECK_FALSE(TestObject != Ptr); CHECK(ResolveCount == 0u);
//compare resolved pointer and unresolved of the same object
CHECK(Ptr == UnResolvedPtr); CHECK(ResolveCount == 0u);
CHECK(UnResolvedPtr == Ptr); CHECK(ResolveCount == 0u);
CHECK_FALSE(Ptr != UnResolvedPtr); CHECK(ResolveCount == 0u);
CHECK_FALSE(UnResolvedPtr != Ptr); CHECK(ResolveCount == 0u);
TestObject = nullptr;
CHECK_FALSE(Ptr == TestObject); CHECK(ResolveCount == 0u);
CHECK_FALSE(TestObject == Ptr); CHECK(ResolveCount == 0u);
CHECK(Ptr != TestObject); CHECK(ResolveCount == 0u);
CHECK(TestObject != Ptr); CHECK(ResolveCount == 0u);
TestObject = static_cast<UObjectPtrTestClass*>(Ptr.Get());
Ptr = nullptr;
CHECK_FALSE(Ptr == TestObject); CHECK(ResolveCount == 0u);
CHECK_FALSE(TestObject == Ptr); CHECK(ResolveCount == 0u);
CHECK(Ptr != TestObject); CHECK(ResolveCount == 0u);
CHECK(TestObject != Ptr); CHECK(ResolveCount == 0u);
}
#endif
#if UE_WITH_OBJECT_HANDLE_LATE_RESOLVE
TEST_CASE_METHOD(FObjectHandleTestBase, "CoreUObject::FObjectHandle::Resolve Malformed Handle", "[CoreUObject][ObjectHandle]")
{
// make one packed ref guarantee something is in the object handle index
FObjectRef TargetRef(FName("/Test/DummyPackage"), FName("ClassPackageName"), FName("ClassName"), UE::CoreUObject::Private::FObjectPathId("DummyObjectName"));
UE::CoreUObject::Private::MakePackedObjectRef(TargetRef);
uint32 ObjectId = ~0u;
UPTRINT PackedId = ObjectId << 1 | 1;
UE::CoreUObject::Private::FPackedObjectRef PackedObjectRef = { PackedId };
TestResolveFailure(PackedObjectRef); // packed ref has a valid package id but invalid object id
TestResolveFailure(UE::CoreUObject::Private::FPackedObjectRef { 0xFFFF'FFFF'FFFF'FFFFull });
TestResolveFailure(UE::CoreUObject::Private::FPackedObjectRef { 0xEFEF'EFEF'EFEF'EFEFull });
}
#endif // UE_WITH_OBJECT_HANDLE_LATE_RESOLVE
TEST_CASE_METHOD(FObjectHandleTestBase, "CoreUObject::FObjectHandle::Hash Object Without Index", "[CoreUObject][ObjectHandle]")
{
UObject DummyObjectWithInvalidIndex(EC_StaticConstructor, RF_NoFlags);
CHECK(DummyObjectWithInvalidIndex.GetUniqueID() == -1);
FObjectHandle DummyObjectHandle = UE::CoreUObject::Private::MakeObjectHandle(&DummyObjectWithInvalidIndex);
CHECK(GetTypeHash(DummyObjectHandle) == GetTypeHash(&DummyObjectWithInvalidIndex));
}
#if UE_WITH_OBJECT_HANDLE_TYPE_SAFETY
TEST_CASE_METHOD(FObjectHandleTestBase, "CoreUObject::FObjectHandle::Type Safety", "[CoreUObject][ObjectHandle]")
{
const FName TestPackageName(TEXT("/Engine/Test/ObjectHandle/TypeSafety/Transient"));
UPackage* TestPackage = NewObject<UPackage>(nullptr, TestPackageName, RF_Transient);
TestPackage->AddToRoot();
ON_SCOPE_EXIT
{
TestPackage->RemoveFromRoot();
};
// simulate an unsafe class type
UClass* TestClass = NewObject<UClass>(TestPackage, TEXT("TestClass"), RF_Transient);
TestClass->SetSuperStruct(UObject::StaticClass());
TestClass->Bind();
TestClass->StaticLink(/*bRelinkExistingProperties =*/ true);
UObject* TestClassDefaults = TestClass->GetDefaultObject();
TestClass->PostLoadDefaultObject(TestClassDefaults);
TestClassDefaults->SetFlags(RF_HasPlaceholderType);
// validate helper method(s)
CHECK_FALSE(UE::CoreUObject::Private::HasAnyFlags(TestClassDefaults, RF_NoFlags));
CHECK(UE::CoreUObject::Private::HasAnyFlags(TestClassDefaults, RF_HasPlaceholderType));
// construct objects for testing
UObject* TestSafeObject = NewObject<UObjectPtrTestClass>(TestPackage, TEXT("TestSafeObject"), RF_Transient);
UObject* TestUnsafeObject = NewObject<UObject>(TestPackage, TestClass, TEXT("TestUnsafeObject"), RF_Transient | RF_HasPlaceholderType);
// construct object handles for testing
FObjectHandle NullObjectHandle = UE::CoreUObject::Private::MakeObjectHandle(nullptr);
FObjectHandle TestSafeObjectHandle = UE::CoreUObject::Private::MakeObjectHandle(TestSafeObject);
FObjectHandle TestUnsafeObjectHandle = UE::CoreUObject::Private::MakeObjectHandle(TestUnsafeObject);
#if UE_WITH_OBJECT_HANDLE_LATE_RESOLVE
// note that unresolved object handles are type safe by definition (since it implies the underlying type was not a placeholder)
FObjectRef TestSafeObjectRef(TestSafeObject);
UE::CoreUObject::Private::FPackedObjectRef PackedSafeObjectRef = UE::CoreUObject::Private::MakePackedObjectRef(TestSafeObjectRef);
FObjectHandle TestUnresolvedSafeObjectHandle = { PackedSafeObjectRef.EncodedRef };
#endif
// NULL/type-safe objects should report as being safe
CHECK(IsObjectHandleTypeSafe(NullObjectHandle));
CHECK(IsObjectHandleTypeSafe(TestSafeObjectHandle));
#if UE_WITH_OBJECT_HANDLE_LATE_RESOLVE
CHECK(IsObjectHandleTypeSafe(TestUnresolvedSafeObjectHandle));
CHECK(!IsObjectHandleResolved(TestUnresolvedSafeObjectHandle)); // the call above should not resolve the handle
#endif
// unsafe type object handles should report as being unsafe
CHECK_FALSE(IsObjectHandleTypeSafe(TestUnsafeObjectHandle));
// object handles should resolve the class to the unsafe type
CHECK(UE::CoreUObject::Private::ResolveObjectHandleClass(TestUnsafeObjectHandle) == TestClass);
// object handles should resolve/evaluate to the original type object
CHECK(UE::CoreUObject::Private::ResolveObjectHandle(TestUnsafeObjectHandle) == TestUnsafeObject);
// construct object pointers for testing
TObjectPtr<UObject> NullObjectPtr(nullptr);
TObjectPtr<UObject> TestSafeObjectPtr(TestSafeObject);
TObjectPtr<UObject> TestUnsafeObjectPtr(TestUnsafeObject);
// unsafe type object pointers should evaluate to NULL/false (for type safety)
CHECK(!TestUnsafeObjectPtr);
CHECK_FALSE(!!TestUnsafeObjectPtr);
CHECK(nullptr == TestUnsafeObjectPtr);
CHECK(TestUnsafeObjectPtr == nullptr);
// an unsafe type object pointer should not equate to NULL/other pointers
CHECK(TestUnsafeObjectPtr != NullObjectPtr);
CHECK(TestUnsafeObjectPtr != TestSafeObjectPtr);
CHECK(TestUnsafeObjectPtr == TestUnsafeObjectPtr);
// an unsafe type object should evaluate the object's attributes correctly
CHECK(TestUnsafeObjectPtr.GetName() == TestUnsafeObject->GetName());
CHECK(TestUnsafeObjectPtr.GetFName() == TestUnsafeObject->GetFName());
CHECK(TestUnsafeObjectPtr.GetPathName() == TestUnsafeObject->GetPathName());
CHECK(TestUnsafeObjectPtr.GetFullName() == TestUnsafeObject->GetFullName());
CHECK(TestUnsafeObjectPtr.GetOuter() == TestUnsafeObject->GetOuter());
CHECK(TestUnsafeObjectPtr.GetPackage() == TestUnsafeObject->GetPackage());
// an unsafe type object should not allow direct access to the underlying type
CHECK(TestUnsafeObjectPtr.GetClass() == nullptr);
// an unsafe type object pointer should resolve to NULL when dereferenced (for type safety)
CHECK(TestUnsafeObjectPtr.Get() == nullptr);
}
#endif
#endif
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