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/*
* Copyright (c) 2019 Samsung Electronics Co., Ltd. All Rights Reserved
*
* 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 "loco/ADT/AnnotatedItem.h"
#include <gtest/gtest.h>
#include <stdex/Memory.h>
namespace
{
struct Annotation
{
virtual ~Annotation() = default;
};
template <int N> struct DerivedAnnotation final : public Annotation
{
static std::unique_ptr<DerivedAnnotation<N>> make(void)
{
return stdex::make_unique<DerivedAnnotation<N>>();
}
};
} // namespace
TEST(AnnotatedItemTest, annotation)
{
loco::AnnotatedItem<::Annotation> item;
ASSERT_EQ(item.annot<DerivedAnnotation<0>>(), nullptr);
item.annot(DerivedAnnotation<0>::make());
ASSERT_NE(item.annot<DerivedAnnotation<0>>(), nullptr);
ASSERT_EQ(item.annot<DerivedAnnotation<1>>(), nullptr);
item.annot<DerivedAnnotation<0>>(nullptr);
ASSERT_EQ(item.annot<DerivedAnnotation<0>>(), nullptr);
// Below check guarantees that "annot<T>(nullptr)" is allowed even when there is no annotation.
// This guarantee allows us to simplify code for some cases.
//
// Let us consider the following example:
//
// void f(loco::AnnotatedItem<T> *item)
// {
// /* DO SOMETHING */
// if (cond) { item->annot<T>(nullptr);
// }
//
// void g(loco::AnnotatedItem<T> *item)
// {
// f(item);
// item->annot<T>(nullptr);
// }
//
// The implementation of "g" gets complicated if annot<T>(nullptr) is not allowed if there is
// no annotation.
//
item.annot<DerivedAnnotation<0>>(nullptr);
}
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