30 struct Expression {  struct
31     Expression() {}  in Expression()  argument
32     virtual ~Expression() {}  in ~Expression()  argument
69     static Expression *parenthesize(Expression *inner);  argument
70     static Expression *atom(Type type, const std::string &value, bool isId = false);
71     static Expression *unary(std::string op, Expression *rhs);
72     static Expression *binary(Expression *lhs, std::string op, Expression *rhs);
73     static Expression *ternary(Expression *lhs, Expression *mhs, Expression *rhs);
74     static Expression *arraySubscript(std::string id, Expression *subscript);
75     static Expression *functionCall(std::string id, std::vector<Expression *> *args);
86     DISALLOW_COPY_AND_ASSIGN(Expression);