madara::expression::SystemCallDeleteVariable Class Reference

Attempts to delete a variable. More...

#include <SystemCallDeleteVariable.h>

Inheritance diagram for madara::expression::SystemCallDeleteVariable:

Collaboration diagram for madara::expression::SystemCallDeleteVariable:

Public Member Functions
	SystemCallDeleteVariable (madara::knowledge::ThreadSafeContext &context, const ComponentNodes &nodes)
	Constructor. More...
virtual	~SystemCallDeleteVariable (void)
	Destructor. More...
virtual void	accept (Visitor &visitor) const
	Accepts a visitor subclassed from the Visitor class. More...
virtual madara::knowledge::KnowledgeRecord	evaluate (const madara::knowledge::KnowledgeUpdateSettings &settings)
	Evaluates the expression tree. More...
virtual madara::knowledge::KnowledgeRecord	item (void) const
	Returns the value of the node. More...
virtual ComponentNode *	left (void) const
	Returns the left expression. More...
virtual madara::knowledge::KnowledgeRecord	prune (bool &can_change)
	Prunes the expression tree of unnecessary nodes. More...
virtual ComponentNode *	right (void) const
	Returns the right expression. More...
void	set_logger (logger::Logger &logger)
	Sets the logger for printing errors and debugging info. More...

Protected Attributes
madara::knowledge::ThreadSafeContext &	context_
logger::Logger *	logger_
	handle the context More...
ComponentNodes	nodes_

Detailed Description

Attempts to delete a variable.

This is an extremely dangerous function call that will break any compiled expression. Do not use this unless you are not going to use compiled expressions that use this variable.

Definition at line 27 of file SystemCallDeleteVariable.h.

Constructor & Destructor Documentation

madara::expression::SystemCallDeleteVariable::SystemCallDeleteVariable	(	madara::knowledge::ThreadSafeContext &	context,
		const ComponentNodes &	nodes
	)

Constructor.

Definition at line 11 of file SystemCallDeleteVariable.cpp.

madara::expression::SystemCallDeleteVariable::~SystemCallDeleteVariable ( void  )

virtual

Destructor.

Definition at line 20 of file SystemCallDeleteVariable.cpp.

Member Function Documentation

void madara::expression::SystemCallDeleteVariable::accept ( Visitor &  visitor ) const

virtual

Accepts a visitor subclassed from the Visitor class.

Parameters

visitor

visitor instance to use

Reimplemented from madara::expression::SystemCallNode.

Definition at line 96 of file SystemCallDeleteVariable.cpp.

madara::knowledge::KnowledgeRecord madara::expression::SystemCallDeleteVariable::evaluate ( const madara::knowledge::KnowledgeUpdateSettings &  settings )

virtual

Evaluates the expression tree.

Evaluates the node and its children.

Returns

value of current contained expression tree

This does not prune any of the expression tree, and is much faster than the prune function

Implements madara::expression::SystemCallNode.

Definition at line 69 of file SystemCallDeleteVariable.cpp.

madara::knowledge::KnowledgeRecord madara::expression::SystemCallDeleteVariable::item ( void  ) const

virtual

Returns the value of the node.

Returns

value of the node

Reimplemented from madara::expression::SystemCallNode.

Definition at line 25 of file SystemCallDeleteVariable.cpp.

madara::expression::ComponentNode * madara::expression::ComponentNode::left ( void  ) const

virtualinherited

Returns the left expression.

Returns

a pointer to the left expression

Reimplemented in madara::expression::CompositeBinaryNode.

Definition at line 34 of file ComponentNode.cpp.

madara::knowledge::KnowledgeRecord madara::expression::SystemCallDeleteVariable::prune ( bool &  can_change )

virtual

Prunes the expression tree of unnecessary nodes.

Prune the tree of unnecessary nodes.

Parameters

can_change

set to true if variable nodes are contained

Returns

value of current contained expression tree

Returns evaluation of the node and sets can_change appropriately. if this node can be changed, that means it shouldn't be pruned.

Implements madara::expression::SystemCallNode.

Definition at line 34 of file SystemCallDeleteVariable.cpp.

madara::expression::ComponentNode * madara::expression::ComponentNode::right ( void  ) const

virtualinherited

Returns the right expression.

Returns

a pointer to the right expression

Reimplemented in madara::expression::CompositeUnaryNode.

Definition at line 41 of file ComponentNode.cpp.

void madara::expression::ComponentNode::set_logger ( logger::Logger &  logger )

inherited

Sets the logger for printing errors and debugging info.

Parameters

logger

the logger to use

Definition at line 53 of file ComponentNode.cpp.

Member Data Documentation

madara::knowledge::ThreadSafeContext& madara::expression::SystemCallNode::context_

protectedinherited

Definition at line 76 of file SystemCallNode.h.

logger::Logger* madara::expression::ComponentNode::logger_

protectedinherited

handle the context

Definition at line 96 of file ComponentNode.h.

ComponentNodes madara::expression::CompositeTernaryNode::nodes_

protectedinherited

Definition at line 76 of file CompositeTernaryNode.h.

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The documentation for this class was generated from the following files:

• include/madara/expression/SystemCallDeleteVariable.h
• include/madara/expression/SystemCallDeleteVariable.cpp