chromium/third_party/dawn/src/dawn/tests/unittests/WeakRefTests.cpp

// Copyright 2023 The Dawn & Tint Authors
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#include <functional>
#include <thread>

#include "dawn/common/WeakRef.h"
#include "dawn/common/WeakRefSupport.h"
#include "dawn/utils/BinarySemaphore.h"
#include "gtest/gtest.h"

namespace dawn {
namespace {

BinarySemaphore;

class RefCountedT : public RefCounted { … };

class WeakRefBaseA : public RefCounted, public WeakRefSupport<WeakRefBaseA> { … };

class WeakRefDerivedA : public WeakRefBaseA { … };

class WeakRefBaseB : public RefCounted, public WeakRefSupport<WeakRefBaseB> { … };
class WeakRefDerivedB : public WeakRefBaseB { … };

// When the original refcounted object is destroyed, all WeakRefs are no longer able to Promote.
TEST(WeakRefTests, BasicPromote) { … }

// When the original refcounted object is destroyed, all WeakRefs, including upcasted ones, are no
// longer able to Promote.
TEST(WeakRefTests, DerivedPromote) { … }

// Trying to promote a WeakRef to a Ref while the original value is being destroyed returns nullptr.
TEST(WeakRefTests, DeletingAndPromoting) { … }

}  // anonymous namespace
}  // namespace dawn

// Special compilation tests that are only enabled when experimental headers are available.
#if __has_include(<experimental/type_traits>)
#include <experimental/type_traits>

namespace dawn {
namespace {

// Helper detection utilities for verifying that unintended assignments are not allowed.
weakref_copyable_t;
weakref_movable_t;
TEST(WeakRefTests, CrossTypesAssignments) { … }

// Helper detection utilty to verify whether GetWeakRef is enabled.
can_get_weakref_t;
TEST(WeakRefTests, GetWeakRefFromPtr) { … }

// Helper detection utilty to verify whether GetWeakRef is enabled.
can_get_weakref_from_ref_t;
TEST(WeakRefTests, GetWeakRefFromRef) { … }

}  // anonymous namespace
}  // namespace dawn

#endif