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38 #ifndef __SIM_MATHEXPR_HH__
39 #define __SIM_MATHEXPR_HH__
49 MathExpr(std::string expr);
51 typedef std::function<double(std::string)> EvalCallback;
54 * Prints an ASCII representation of the expression tree
56 * @return A string containing the ASCII representation of the expression
58 std::string toStr() const { return toStr(root, ""); }
61 * Evaluates the expression
63 * @param fn A callback funcion to evaluate variables
65 * @return The value for this expression
67 double eval(EvalCallback fn) const { return eval(root, fn); }
71 bAdd, bSub, bMul, bDiv, bPow, uNeg, sValue, sVariable, nInvalid
75 const int MAX_PRIO = 4;
76 typedef double (*binOp)(double, double);
86 std::array<OpSearch, uNeg + 1> ops;
90 Node() : op(nInvalid), l(0), r(0), value(0) {}
91 std::string toStr() const {
92 const char opStr[] = {'+', '-', '*', '/', '^', '-'};
99 return std::to_string(value);
101 return std::string(1, opStr[op]);
108 std::string variable;
114 /** Parse and create nodes from string */
115 Node *parse(std::string expr);
117 /** Print tree as string */
118 std::string toStr(Node *n, std::string prefix) const;
121 double eval(const Node *n, EvalCallback fn) const;