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* Made implementation more expressive by replacing the integer priority with an strictly typed enum called TokenType
** Made removal of character comparisons from tree construction and lexer possible
* As a side effect distinct numbers had to be assigned to each token
** Operators of same priority do not have identical numbers anymore
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* Invalid input syntax led to undefined behavior when accessing the top element of an empty stack
** Fixed by introducing a new "topNodeFrom" function which throws an exeption in the case that the given std::stack reference is empty
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* library is called libSimpleParser.so
* parser was renamed to clc
* test and clc are using the shared library
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* Enabled tree to generate itself
** Main work is now done during tree construction
* Moved lexer and getPriority utility functions into separate compilation unit
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to the libary user by providing a new plain "exportTree" function
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priority determination and tree building functions were hidden in
unnamed namespace
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