This class implements std::abs(x) function which can be used in ICalculator to calculate absulute value of argument.

You can find more information in comments below. Overrided methods can be found in corresponding base class or interface.

class CProcedureAbs :public CProcedure
    {
    public:
        CVariable *Calculate(CVariable *parent, CVariable *args) override;
    
        CProcedureAbs();
    };