ResourceDestructionGuard.h

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// Copyright (c) Fraunhofer MEVIS, Germany. All rights reserved.
// **InsertLicense** code
 
#pragma once
 
#include <asio/System.h>
 
#include <FMEThirdPartyWarningsDisable.h>
#include <mutex>
#include <memory>
#include <FMEThirdPartyWarningsRestore.h>
 
 
namespace asio {
 
  class ASYNCHRONOUSIO_EXPORT ResourceDestructionGuard final
  {
    using ShareType = unsigned char;
 
    class ASYNCHRONOUSIO_EXPORT LockedHandle final
    {
    public:
 
      LockedHandle(std::mutex& mutex, std::weak_ptr<ShareType> share);
 
      operator bool() const;
 
    private:
 
      std::unique_lock<std::mutex> lock;
      std::shared_ptr<ShareType> share;
    };
 
 
    class ASYNCHRONOUSIO_EXPORT WeakHandle final
    {
    public:
 
      WeakHandle(std::shared_ptr<std::mutex> mutex, std::weak_ptr<ShareType> share);
 
      LockedHandle lock() const;
 
    private:
 
      std::shared_ptr<std::mutex> mutex;
      std::weak_ptr<ShareType> share;
    };
 
 
  public:
 
    ResourceDestructionGuard();
    ResourceDestructionGuard(const ResourceDestructionGuard&) = default;
    ResourceDestructionGuard& operator=(const ResourceDestructionGuard&) = default;
    ~ResourceDestructionGuard();
 
    WeakHandle handle() const;
 
  private:
 
    std::shared_ptr<std::mutex> mutex;
    std::shared_ptr<ShareType> share;
  };
 
}