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* access was restricted by declaring them private and offering member methods such as "hasChildren"
* only OperatorNode instances have children, there is no reason for wasting space by keeping empty pointers around in all other instances
* this enabled the removal of all nullptr comparisons from tree construction
* changed "Tree::addNode" factory method template to return a pointer to the type of the constructed node instance instead of a plain node pointer
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* marked "solve" and "print" implementations as const
* converted member variables into constants where possible
* "type" member method is not necessary and partially defeats the purpose of declaring virtual members
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* now using range for-loops during Tree printing
* inroduced popNode helper method which helps to simplify the Tree construction implementation
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* SimpleParser optionally acceps a pointer to an ConstantMap containing string keys mapping to values
* Constants are handled in their own ConstantNode class derived from the standard Node class
* Operator precedence is now determined separated from the TokenType using a new PrecedenceLevel enum
** Conversion between tokens and their PrecedenceLevel is possible using the new utility function getPrecedence
* Added additional test cases for constant identifier resolutions
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Added ConstantNode blueprint
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* OperatorNode class now uses TokenType for internal operator storage and logic selection
* print-Method resolves the TokenType back into its character representation
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* New priority for alphabetic characters
* Overloaded OperandNode constructor
* Currently not usable, only basic proof of concept
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