QueryContext.h

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/*

             *
            ***
           *****
   *********************       Mercenaries Engineering SARL
     *****************              Copyright (C) 2020
       *************
         *********        http://www.mercenaries-engineering.com
        ***********
       ****     ****
      **           **

*/
#pragma once

#include "Export.h"
#include <optional>

namespace maquina
{
  class MAQUINA_EXPORT QueryContext
  {
  public:
    
    QueryContext(
      float frame 
    );

    // Return the query's frame. If success, returns the frame at which the value should be evaluated else the current document time should be used.
    std::optional<float> frame() const;

  private:
    float _frame;       // The frame at which the value should be evaluated in the node's document time or current_frame
  public:
    const static QueryContext at_current_frame;  
    const static float current_frame;
  };
}