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= Expression Parser =
This function can parse any string containing a mathematical expression like {{{"2 * (34+1)/2 *sin(pi*3)/cosh(7)"}}}. [[br]]
Usage: Pass a std::string to the constructor and the ExprParser will parse an expression that equals one number. That means that {{{"3 4"}}} will yield 3. Then you can use the following query functions:
|| getRemains() || Returns the rest of the string that did get parsed ||
|| getResult()  || Query the result of the parsing ||
|| getSuccess() || Tells whether any number could be retrieved at all ||