// Copyright (C) 2019-2020 Zilliz. 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.

#pragma once

#include <mutex>

namespace milvus {

template <typename T>
class Value {
 public:
    const T&
    operator()() {
        std::lock_guard<std::mutex> lock(mutex_);
        return value_;
    }

    Value&
    operator=(T value) {
        std::lock_guard<std::mutex> lock(mutex_);
        value_ = value;
        return *this;
    }

 private:
    std::mutex mutex_;
    T value_;
};

}  // namespace milvus