MADARA  3.1.8
SystemCallDeleteVariable.h
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1 /* -*- C++ -*- */
2 #ifndef _MADARA_SYSTEM_CALL_DELETE_VARIABLE_H_
3 #define _MADARA_SYSTEM_CALL_DELETE_VARIABLE_H_
4 
5 #ifndef _MADARA_NO_KARL_
6 
7 #include <string>
8 #include <stdexcept>
11 
12 
13 namespace madara
14 {
15  namespace expression
16  {
17  // Forward declaration.
18  class Visitor;
19 
28  {
29  public:
35  const ComponentNodes & nodes);
36 
40  virtual ~SystemCallDeleteVariable (void);
41 
46  virtual madara::knowledge::KnowledgeRecord item (void) const;
47 
53  virtual madara::knowledge::KnowledgeRecord prune (bool & can_change);
54 
61 
66  virtual void accept (Visitor &visitor) const;
67  };
68  }
69 }
70 
71 #endif // _MADARA_NO_KARL_
72 
73 #endif /* _MADARA_SYSTEM_CALL_DELETE_VARIABLE_H_ */
This class encapsulates an entry in a KnowledgeBase.
SystemCallDeleteVariable(madara::knowledge::ThreadSafeContext &context, const ComponentNodes &nodes)
Constructor.
std::deque< ComponentNode * > ComponentNodes
a vector of Component Nodes
virtual madara::knowledge::KnowledgeRecord evaluate(const madara::knowledge::KnowledgeUpdateSettings &settings)
Evaluates the expression tree.
This class stores variables and their values for use by any entity needing state information in a thr...
virtual madara::knowledge::KnowledgeRecord item(void) const
Returns the value of the node.
virtual madara::knowledge::KnowledgeRecord prune(bool &can_change)
Prunes the expression tree of unnecessary nodes.
Abstract base class for all visitors to all classes that derive from ComponentNode.
Definition: Visitor.h:90
virtual void accept(Visitor &visitor) const
Accepts a visitor subclassed from the Visitor class.
Interface for a MADARA system call.
Settings for applying knowledge updates.
Copyright (c) 2015 Carnegie Mellon University.