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63 lines
1.9 KiB
C++
63 lines
1.9 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#pragma once
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#include <memory>
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#include <type_traits>
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#include <utility>
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#include "arrow/util/macros.h"
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namespace arrow {
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namespace util {
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/// CRTP helper for declaring equality comparison. Defines operator== and operator!=
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template <typename T>
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class EqualityComparable {
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public:
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~EqualityComparable() {
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static_assert(
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std::is_same<decltype(std::declval<const T>().Equals(std::declval<const T>())),
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bool>::value,
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"EqualityComparable depends on the method T::Equals(const T&) const");
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}
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template <typename... Extra>
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bool Equals(const std::shared_ptr<T>& other, Extra&&... extra) const {
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if (other == NULLPTR) {
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return false;
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}
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return cast().Equals(*other, std::forward<Extra>(extra)...);
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}
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struct PtrsEqual {
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bool operator()(const std::shared_ptr<T>& l, const std::shared_ptr<T>& r) const {
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return l->Equals(r);
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}
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};
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bool operator==(const T& other) const { return cast().Equals(other); }
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bool operator!=(const T& other) const { return !(cast() == other); }
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private:
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const T& cast() const { return static_cast<const T&>(*this); }
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};
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} // namespace util
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} // namespace arrow
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