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// Copyright 2017 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <type_traits>
#include "gtest/gtest.h"
#include "dawn/common/Ref.h"
#include "dawn/common/RefCounted.h"
#include "dawn/native/ToBackend.h"
// Make our own Base - Backend object pair, reusing the MyObjectBase name
namespace dawn::native {
class MyObjectBase : public RefCounted {};
class MyObject : public MyObjectBase {};
struct MyBackendTraits {
using MyObjectType = MyObject;
};
template <typename BackendTraits>
struct ToBackendTraits<MyObjectBase, BackendTraits> {
using BackendType = typename BackendTraits::MyObjectType;
};
// Instantiate ToBackend for our "backend"
template <typename T>
auto ToBackend(T&& common) -> decltype(ToBackendBase<MyBackendTraits>(common)) {
return ToBackendBase<MyBackendTraits>(common);
}
// Test that ToBackend correctly converts pointers to base classes.
TEST(ToBackend, Pointers) {
{
MyObject* myObject = new MyObject;
const MyObjectBase* base = myObject;
auto* backendAdapter = ToBackend(base);
static_assert(std::is_same<decltype(backendAdapter), const MyObject*>::value);
ASSERT_EQ(myObject, backendAdapter);
myObject->Release();
}
{
MyObject* myObject = new MyObject;
MyObjectBase* base = myObject;
auto* backendAdapter = ToBackend(base);
static_assert(std::is_same<decltype(backendAdapter), MyObject*>::value);
ASSERT_EQ(myObject, backendAdapter);
myObject->Release();
}
}
// Test that ToBackend correctly converts Refs to base classes.
TEST(ToBackend, Ref) {
{
MyObject* myObject = new MyObject;
const Ref<MyObjectBase> base(myObject);
const auto& backendAdapter = ToBackend(base);
static_assert(std::is_same<decltype(ToBackend(base)), const Ref<MyObject>&>::value);
ASSERT_EQ(myObject, backendAdapter.Get());
myObject->Release();
}
{
MyObject* myObject = new MyObject;
Ref<MyObjectBase> base(myObject);
auto backendAdapter = ToBackend(base);
static_assert(std::is_same<decltype(ToBackend(base)), Ref<MyObject>&>::value);
ASSERT_EQ(myObject, backendAdapter.Get());
myObject->Release();
}
}
} // namespace dawn::native