Interface of class responsible for calculation of different operators.

You can find more information in comments below.

class IOperatorCalculator
    {
    public:
        // Calculate math simple 2 operand expression 
        virtual CVariable *Percent(CVariable *value1, CVariable *value2) = 0; // %
        virtual CVariable *Ampersand(CVariable *value1, CVariable *value2) = 0; // &
        virtual CVariable *Asterisk(CVariable *value1, CVariable *value2) = 0; // *
        virtual CVariable *Plus(CVariable *value1, CVariable *value2) = 0; // +
        virtual CVariable *Minus(CVariable *value1, CVariable *value2) = 0; // -
        virtual CVariable *Period(CVariable *value1, CVariable *value2) = 0; // .
        virtual CVariable *Slash(CVariable *value1, CVariable *value2) = 0; // /
        virtual CVariable *Less(CVariable *value1, CVariable *value2) = 0; // <
        virtual CVariable *Equal(CVariable *value1, CVariable *value2) = 0; // =
        virtual CVariable *Greater(CVariable *value1, CVariable *value2) = 0; // >
        virtual CVariable *Caret(CVariable *value1, CVariable *value2) = 0; // ^
        virtual CVariable *Pipe(CVariable *value1, CVariable *value2) = 0; // |
        virtual CVariable *ExclamationEqual(CVariable *value1, CVariable *value2) = 0; // !=
        virtual CVariable *Exclamation2Equal(CVariable *value1, CVariable *value2) = 0; // !==
        virtual CVariable *DoubleAmpersand(CVariable *value1, CVariable *value2) = 0; // &&
        virtual CVariable *LessEqual(CVariable *value1, CVariable *value2) = 0; // <=
        virtual CVariable *Less2Equal(CVariable *value1, CVariable *value2) = 0; // <==
        virtual CVariable *LessGreater(CVariable *value1, CVariable *value2) = 0; // <>
        virtual CVariable *DoubleLess(CVariable *value1, CVariable *value2) = 0; // <<
        virtual CVariable *DoubleEqual(CVariable *value1, CVariable *value2) = 0; // ==
        virtual CVariable *TripleEqual(CVariable *value1, CVariable *value2) = 0; // ===
        virtual CVariable *DoubleGreater(CVariable *value1, CVariable *value2) = 0; // >>
        virtual CVariable *GreaterEqual(CVariable *value1, CVariable *value2) = 0; // >=
        virtual CVariable *Greater2Equal(CVariable *value1, CVariable *value2) = 0; // >==
        virtual CVariable *DoublePipe(CVariable *value1, CVariable *value2) = 0; // ||
        virtual CVariable *SymAnd(CVariable *value1, CVariable *value2) = 0; // and
        virtual CVariable *SymOr(CVariable *value1, CVariable *value2) = 0; // or
        virtual CVariable *SymXor(CVariable *value1, CVariable *value2) = 0; // xor
        virtual CVariable *SymShr(CVariable *value1, CVariable *value2) = 0; // shr
        virtual CVariable *SymShl(CVariable *value1, CVariable *value2) = 0; // shl
        virtual CVariable *SymDiv(CVariable *value1, CVariable *value2) = 0; // div
        virtual CVariable *SymMod(CVariable *value1, CVariable *value2) = 0; // mod
    
        // Change value according to "pre" operator 
        virtual bool PreExclamation(CVariable *value) = 0; // !
        virtual bool PrePlus(CVariable *value) = 0; // +
        virtual bool PreMinus(CVariable *value) = 0; // -
        virtual bool Pre2Plus(CVariable *value) = 0; // ++
        virtual bool Pre2Minus(CVariable *value) = 0; // --
        virtual bool PreSymNot(CVariable *value) = 0; // not
    
        // Change value according to "post" operator 
        virtual bool Post2Plus(CVariable *value) = 0; // ++
        virtual bool Post2Minus(CVariable *value) = 0; // --
    
        virtual void Release() = 0;
    };