src/Blackboard/ScopeCalculatedListener.hpp

   1 /*
   2 Copyright_License {
   3
   4   XCSoar Glide Computer - http://www.xcsoar.org/
   5   Copyright (C) 2000-2013 The XCSoar Project
   6   A detailed list of copyright holders can be found in the file "AUTHORS".
   7
   8   This program is free software; you can redistribute it and/or
   9   modify it under the terms of the GNU General Public License
  10   as published by the Free Software Foundation; either version 2
  11   of the License, or (at your option) any later version.
  12
  13   This program is distributed in the hope that it will be useful,
  14   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16   GNU General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with this program; if not, write to the Free Software
  20   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  21 }
  22 */
  23
  24 #ifndef XCSOAR_SCOPE_CALCULATED_LISTENER_HPP
  25 #define XCSOAR_SCOPE_CALCULATED_LISTENER_HPP
  26
  27 #include "BlackboardListener.hpp"
  28 #include "LiveBlackboard.hpp"
  29 #include "Compiler.h"
  30
  31 #include <functional>
  32
  33 #include <assert.h>
  34
  35 /**
  36  * A dummy class that implements all abstract methods as no-ops.
  37  * Inherit this class and only implement the methods you're interested
  38  * in.
  39  */
  40 class ScopeCalculatedListener : public NullBlackboardListener {
  41 public:
  42   typedef std::function<void(const MoreData &basic,
  43                              const DerivedInfo &calculated)> Function;
  44
  45 private:
  46   LiveBlackboard &blackboard;
  47   Function function;
  48
  49 public:
  50   ScopeCalculatedListener(LiveBlackboard &_blackboard, Function _function)
  51     :blackboard(_blackboard), function(_function) {
  52     assert(function);
  53
  54     blackboard.AddListener(*this);
  55   }
  56
  57   ~ScopeCalculatedListener() {
  58     blackboard.RemoveListener(*this);
  59   }
  60
  61   virtual void OnCalculatedUpdate(const MoreData &basic,
  62                                   const DerivedInfo &calculated) override;
  63 };
  64
  65 #endif