chromium/third_party/distributed_point_functions/code/dpf/xor_wrapper.h

/*
 * Copyright 2021 Google LLC
 *
 * 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.
 */

#ifndef DISTRIBUTED_POINT_FUNCTIONS_DPF_XOR_WRAPPER_H_
#define DISTRIBUTED_POINT_FUNCTIONS_DPF_XOR_WRAPPER_H_

#include <utility>

namespace distributed_point_functions {

// Wraps the given type, replacing additions and subtractions by XOR.
template <typename T>
class XorWrapper { … };

template <typename T>
constexpr XorWrapper<T> operator+(XorWrapper<T> a, const XorWrapper<T>& b) { … }

template <typename T>
constexpr XorWrapper<T> operator-(XorWrapper<T> a, const XorWrapper<T>& b) { … }

// Negation does nothing in XOR sharing, since -a = 0-a.
template <typename T>
constexpr XorWrapper<T> operator-(const XorWrapper<T>& a) { … }

template <typename T>
constexpr bool operator==(const XorWrapper<T>& a, const XorWrapper<T>& b) { … }

template <typename T>
constexpr bool operator!=(const XorWrapper<T>& a, const XorWrapper<T>& b) { … }

}  // namespace distributed_point_functions

#endif  // DISTRIBUTED_POINT_FUNCTIONS_DPF_XOR_WRAPPER_H_