shareddata.h

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/******************************************************************************
 Copyright (c) 2012-2016 Institut für Nachrichtentechnik, Universität Rostock
 Copyright (c) 2006-2012 Quality & Usability Lab
                         Deutsche Telekom Laboratories, TU Berlin
 
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// https://AudioProcessingFramework.github.io/
 
 
#ifndef APF_SHAREDDATA_H
#define APF_SHAREDDATA_H
 
#include "apf/commandqueue.h"
 
namespace apf
{
 
template<typename X>
class SharedData
{
  public:
    class SetCommand;
 
    explicit SharedData(CommandQueue& fifo, X&& def = X())
      : _fifo(fifo)
      , _data(std::forward<X>(def))
    {}
 
    const X& get() const { return _data; }
 
    operator const X&() const { return this->get(); }
 
    void operator=(const X& rhs)
    {
      _fifo.push(new SetCommand(&_data, rhs));
    }
 
    void operator=(X&& rhs)
    {
      _fifo.push(new SetCommand(&_data, std::forward<X>(rhs)));
    }
 
    void set_from_rt_thread(X&& data)
    {
      _data = std::forward<X>(data);
    }
 
    friend bool
    operator==(const SharedData& lhs, const X& rhs) { return lhs._data == rhs; }
    friend bool
    operator==(const X& lhs, const SharedData& rhs) { return lhs == rhs._data; }
    friend bool
    operator!=(const SharedData& lhs, const X& rhs) { return lhs._data != rhs; }
    friend bool
    operator!=(const X& lhs, const SharedData& rhs) { return lhs != rhs._data; }
 
  private:
    CommandQueue& _fifo;
    X _data;
};
 
template<typename X>
class SharedData<X>::SetCommand : public CommandQueue::Command
{
  public:
    SetCommand(X* pointer, const X& data)
      : _pointer(pointer)
      , _data(data)
    {
      assert(pointer != nullptr);
    }
 
    SetCommand(X* pointer, X&& data)
      : _pointer(pointer)
      , _data(std::forward<X>(data))
    {
      assert(pointer != nullptr);
    }
 
  private:
    virtual void execute()
    {
      using std::swap;
      swap(*_pointer, _data);
    }
 
    virtual void cleanup() {}
 
    X* _pointer;
    X _data;  
};
 
}  // namespace apf
 
#endif