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// Copyright 2018 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 <memory>
#include <utility>
#include <vector>
#include "dawn/common/RefCounted.h"
#include "dawn/common/Result.h"
#include "gtest/gtest.h"
namespace {
template <typename T, typename E>
void TestError(Result<T, E>* result, E expectedError) {
EXPECT_TRUE(result->IsError());
EXPECT_FALSE(result->IsSuccess());
std::unique_ptr<E> storedError = result->AcquireError();
EXPECT_EQ(*storedError, expectedError);
}
template <typename T, typename E>
void TestSuccess(Result<T, E>* result, T expectedSuccess) {
EXPECT_FALSE(result->IsError());
EXPECT_TRUE(result->IsSuccess());
const T storedSuccess = result->AcquireSuccess();
EXPECT_EQ(storedSuccess, expectedSuccess);
// Once the success is acquired, result has an empty
// payload and is neither in the success nor error state.
EXPECT_FALSE(result->IsError());
EXPECT_FALSE(result->IsSuccess());
}
static int placeholderError = 0xbeef;
static float placeholderSuccess = 42.0f;
static const float placeholderConstSuccess = 42.0f;
class AClass : public RefCounted {
public:
int a = 0;
};
// Tests using the following overload of TestSuccess make
// local Ref instances to placeholderSuccessObj. Tests should
// ensure any local Ref objects made along the way continue
// to point to placeholderSuccessObj.
template <typename T, typename E>
void TestSuccess(Result<Ref<T>, E>* result, T* expectedSuccess) {
EXPECT_FALSE(result->IsError());
EXPECT_TRUE(result->IsSuccess());
// AClass starts with a reference count of 1 and stored
// on the stack in the caller. The result parameter should
// hold the only other reference to the object.
EXPECT_EQ(expectedSuccess->GetRefCountForTesting(), 2u);
const Ref<T> storedSuccess = result->AcquireSuccess();
EXPECT_EQ(storedSuccess.Get(), expectedSuccess);
// Once the success is acquired, result has an empty
// payload and is neither in the success nor error state.
EXPECT_FALSE(result->IsError());
EXPECT_FALSE(result->IsSuccess());
// Once we call AcquireSuccess, result no longer stores
// the object. storedSuccess should contain the only other
// reference to the object.
EXPECT_EQ(storedSuccess->GetRefCountForTesting(), 2u);
}
// Result<void, E*>
// Test constructing an error Result<void, E>
TEST(ResultOnlyPointerError, ConstructingError) {
Result<void, int> result(std::make_unique<int>(placeholderError));
TestError(&result, placeholderError);
}
// Test moving an error Result<void, E>
TEST(ResultOnlyPointerError, MovingError) {
Result<void, int> result(std::make_unique<int>(placeholderError));
Result<void, int> movedResult(std::move(result));
TestError(&movedResult, placeholderError);
}
// Test returning an error Result<void, E>
TEST(ResultOnlyPointerError, ReturningError) {
auto CreateError = []() -> Result<void, int> {
return {std::make_unique<int>(placeholderError)};
};
Result<void, int> result = CreateError();
TestError(&result, placeholderError);
}
// Test constructing a success Result<void, E>
TEST(ResultOnlyPointerError, ConstructingSuccess) {
Result<void, int> result;
EXPECT_TRUE(result.IsSuccess());
EXPECT_FALSE(result.IsError());
}
// Test moving a success Result<void, E>
TEST(ResultOnlyPointerError, MovingSuccess) {
Result<void, int> result;
Result<void, int> movedResult(std::move(result));
EXPECT_TRUE(movedResult.IsSuccess());
EXPECT_FALSE(movedResult.IsError());
}
// Test returning a success Result<void, E>
TEST(ResultOnlyPointerError, ReturningSuccess) {
auto CreateError = []() -> Result<void, int> { return {}; };
Result<void, int> result = CreateError();
EXPECT_TRUE(result.IsSuccess());
EXPECT_FALSE(result.IsError());
}
// Result<T*, E*>
// Test constructing an error Result<T*, E>
TEST(ResultBothPointer, ConstructingError) {
Result<float*, int> result(std::make_unique<int>(placeholderError));
TestError(&result, placeholderError);
}
// Test moving an error Result<T*, E>
TEST(ResultBothPointer, MovingError) {
Result<float*, int> result(std::make_unique<int>(placeholderError));
Result<float*, int> movedResult(std::move(result));
TestError(&movedResult, placeholderError);
}
// Test returning an error Result<T*, E>
TEST(ResultBothPointer, ReturningError) {
auto CreateError = []() -> Result<float*, int> {
return {std::make_unique<int>(placeholderError)};
};
Result<float*, int> result = CreateError();
TestError(&result, placeholderError);
}
// Test constructing a success Result<T*, E>
TEST(ResultBothPointer, ConstructingSuccess) {
Result<float*, int> result(&placeholderSuccess);
TestSuccess(&result, &placeholderSuccess);
}
// Test moving a success Result<T*, E>
TEST(ResultBothPointer, MovingSuccess) {
Result<float*, int> result(&placeholderSuccess);
Result<float*, int> movedResult(std::move(result));
TestSuccess(&movedResult, &placeholderSuccess);
}
// Test returning a success Result<T*, E>
TEST(ResultBothPointer, ReturningSuccess) {
auto CreateSuccess = []() -> Result<float*, int*> { return {&placeholderSuccess}; };
Result<float*, int*> result = CreateSuccess();
TestSuccess(&result, &placeholderSuccess);
}
// Tests converting from a Result<TChild*, E>
TEST(ResultBothPointer, ConversionFromChildClass) {
struct T {
int a;
};
struct TChild : T {};
TChild child;
T* childAsT = &child;
{
Result<T*, int> result(&child);
TestSuccess(&result, childAsT);
}
{
Result<TChild*, int> resultChild(&child);
Result<T*, int> result(std::move(resultChild));
TestSuccess(&result, childAsT);
}
{
Result<TChild*, int> resultChild(&child);
Result<T*, int> result = std::move(resultChild);
TestSuccess(&result, childAsT);
}
}
// Result<const T*, E>
// Test constructing an error Result<const T*, E>
TEST(ResultBothPointerWithConstResult, ConstructingError) {
Result<const float*, int> result(std::make_unique<int>(placeholderError));
TestError(&result, placeholderError);
}
// Test moving an error Result<const T*, E>
TEST(ResultBothPointerWithConstResult, MovingError) {
Result<const float*, int> result(std::make_unique<int>(placeholderError));
Result<const float*, int> movedResult(std::move(result));
TestError(&movedResult, placeholderError);
}
// Test returning an error Result<const T*, E*>
TEST(ResultBothPointerWithConstResult, ReturningError) {
auto CreateError = []() -> Result<const float*, int> {
return {std::make_unique<int>(placeholderError)};
};
Result<const float*, int> result = CreateError();
TestError(&result, placeholderError);
}
// Test constructing a success Result<const T*, E*>
TEST(ResultBothPointerWithConstResult, ConstructingSuccess) {
Result<const float*, int> result(&placeholderConstSuccess);
TestSuccess(&result, &placeholderConstSuccess);
}
// Test moving a success Result<const T*, E*>
TEST(ResultBothPointerWithConstResult, MovingSuccess) {
Result<const float*, int> result(&placeholderConstSuccess);
Result<const float*, int> movedResult(std::move(result));
TestSuccess(&movedResult, &placeholderConstSuccess);
}
// Test returning a success Result<const T*, E*>
TEST(ResultBothPointerWithConstResult, ReturningSuccess) {
auto CreateSuccess = []() -> Result<const float*, int> { return {&placeholderConstSuccess}; };
Result<const float*, int> result = CreateSuccess();
TestSuccess(&result, &placeholderConstSuccess);
}
// Result<Ref<T>, E>
// Test constructing an error Result<Ref<T>, E>
TEST(ResultRefT, ConstructingError) {
Result<Ref<AClass>, int> result(std::make_unique<int>(placeholderError));
TestError(&result, placeholderError);
}
// Test moving an error Result<Ref<T>, E>
TEST(ResultRefT, MovingError) {
Result<Ref<AClass>, int> result(std::make_unique<int>(placeholderError));
Result<Ref<AClass>, int> movedResult(std::move(result));
TestError(&movedResult, placeholderError);
}
// Test returning an error Result<Ref<T>, E>
TEST(ResultRefT, ReturningError) {
auto CreateError = []() -> Result<Ref<AClass>, int> {
return {std::make_unique<int>(placeholderError)};
};
Result<Ref<AClass>, int> result = CreateError();
TestError(&result, placeholderError);
}
// Test constructing a success Result<Ref<T>, E>
TEST(ResultRefT, ConstructingSuccess) {
AClass success;
Ref<AClass> refObj(&success);
Result<Ref<AClass>, int> result(std::move(refObj));
TestSuccess(&result, &success);
}
// Test moving a success Result<Ref<T>, E>
TEST(ResultRefT, MovingSuccess) {
AClass success;
Ref<AClass> refObj(&success);
Result<Ref<AClass>, int> result(std::move(refObj));
Result<Ref<AClass>, int> movedResult(std::move(result));
TestSuccess(&movedResult, &success);
}
// Test returning a success Result<Ref<T>, E>
TEST(ResultRefT, ReturningSuccess) {
AClass success;
auto CreateSuccess = [&success]() -> Result<Ref<AClass>, int> { return Ref<AClass>(&success); };
Result<Ref<AClass>, int> result = CreateSuccess();
TestSuccess(&result, &success);
}
class OtherClass {
public:
int a = 0;
};
class Base : public RefCounted {};
class Child : public OtherClass, public Base {};
// Test constructing a Result<Ref<TChild>, E>
TEST(ResultRefT, ConversionFromChildConstructor) {
Child child;
Ref<Child> refChild(&child);
Result<Ref<Base>, int> result(std::move(refChild));
TestSuccess<Base>(&result, &child);
}
// Test copy constructing Result<Ref<TChild>, E>
TEST(ResultRefT, ConversionFromChildCopyConstructor) {
Child child;
Ref<Child> refChild(&child);
Result<Ref<Child>, int> resultChild(std::move(refChild));
Result<Ref<Base>, int> result(std::move(resultChild));
TestSuccess<Base>(&result, &child);
}
// Test assignment operator for Result<Ref<TChild>, E>
TEST(ResultRefT, ConversionFromChildAssignmentOperator) {
Child child;
Ref<Child> refChild(&child);
Result<Ref<Child>, int> resultChild(std::move(refChild));
Result<Ref<Base>, int> result = std::move(resultChild);
TestSuccess<Base>(&result, &child);
}
// Result<T, E>
// Test constructing an error Result<T, E>
TEST(ResultGeneric, ConstructingError) {
Result<std::vector<float>, int> result(std::make_unique<int>(placeholderError));
TestError(&result, placeholderError);
}
// Test moving an error Result<T, E>
TEST(ResultGeneric, MovingError) {
Result<std::vector<float>, int> result(std::make_unique<int>(placeholderError));
Result<std::vector<float>, int> movedResult(std::move(result));
TestError(&movedResult, placeholderError);
}
// Test returning an error Result<T, E>
TEST(ResultGeneric, ReturningError) {
auto CreateError = []() -> Result<std::vector<float>, int> {
return {std::make_unique<int>(placeholderError)};
};
Result<std::vector<float>, int> result = CreateError();
TestError(&result, placeholderError);
}
// Test constructing a success Result<T, E>
TEST(ResultGeneric, ConstructingSuccess) {
Result<std::vector<float>, int> result({1.0f});
TestSuccess(&result, {1.0f});
}
// Test moving a success Result<T, E>
TEST(ResultGeneric, MovingSuccess) {
Result<std::vector<float>, int> result({1.0f});
Result<std::vector<float>, int> movedResult(std::move(result));
TestSuccess(&movedResult, {1.0f});
}
// Test returning a success Result<T, E>
TEST(ResultGeneric, ReturningSuccess) {
auto CreateSuccess = []() -> Result<std::vector<float>, int> { return {{1.0f}}; };
Result<std::vector<float>, int> result = CreateSuccess();
TestSuccess(&result, {1.0f});
}
} // anonymous namespace