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Copy pathchecked_cast_test.cc
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74 lines (59 loc) · 2.15 KB
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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 <typeinfo>
#include <gtest/gtest.h>
#include "arrow/util/checked_cast.h"
namespace arrow {
namespace internal {
class Foo {
public:
virtual ~Foo() = default;
};
class Bar {};
class FooSub : public Foo {};
template <typename T>
class Baz : public Foo {};
TEST(CheckedCast, TestInvalidSubclassCast) {
static_assert(std::is_polymorphic<Foo>::value, "Foo is not polymorphic");
Foo foo;
FooSub foosub;
const Foo& foosubref = foosub;
Baz<double> baz;
const Foo& bazref = baz;
#ifndef NDEBUG // debug mode
// illegal pointer cast
ASSERT_EQ(nullptr, checked_cast<Bar*>(&foo));
// illegal reference cast
ASSERT_THROW(checked_cast<const Bar&>(foosubref), std::bad_cast);
// legal reference casts
ASSERT_NO_THROW(checked_cast<const FooSub&>(foosubref));
ASSERT_NO_THROW(checked_cast<const Baz<double>&>(bazref));
#else // release mode
// failure modes for the invalid casts occur at compile time
// legal pointer cast
ASSERT_NE(nullptr, checked_cast<const FooSub*>(&foosubref));
// legal reference casts: this is static_cast in a release build, so ASSERT_NO_THROW
// doesn't make a whole lot of sense here.
auto& x = checked_cast<const FooSub&>(foosubref);
ASSERT_EQ(&foosubref, &x);
auto& y = checked_cast<const Baz<double>&>(bazref);
ASSERT_EQ(&bazref, &y);
#endif
}
} // namespace internal
} // namespace arrow