mathEvaluator.h

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// Gmsh - Copyright (C) 1997-2022 C. Geuzaine, J.-F. Remacle
//
// See the LICENSE.txt file in the Gmsh root directory for license information.
// Please report all issues on https://gitlab.onelab.info/gmsh/gmsh/issues.
 
#ifndef MATH_EVALUATOR_H
#define MATH_EVALUATOR_H
 
#include <vector>
#include <string>
#include "GmshConfig.h"
#include "GmshMessage.h"
 
#if defined(HAVE_MATHEX)
 
#include "mathex.h"
 
class mathEvaluator {
private:
  std::vector<smlib::mathex *> _expressions;
  std::vector<double> _variables;
 
public:
  // initialize one or more expressions depending on zero or more
  // variables. If an error occurs the vector of expressions is
  // cleared.
  mathEvaluator(std::vector<std::string> &expressions,
                const std::vector<std::string> &variables);
  ~mathEvaluator();
  // evaluate the expression(s) using the given values and fill the
  // result vector. Returns true if the evaluation succeeded.
  bool eval(const std::vector<double> &values, std::vector<double> &res);
};
 
#else
 
class mathEvaluator {
public:
  mathEvaluator(std::vector<std::string> &expressions,
                const std::vector<std::string> &variables)
  {
    Msg::Error("Gmsh must be compiled with MathEx support to evaluate math "
               "expressions");
    expressions.clear();
  }
  ~mathEvaluator() {}
  bool eval(const std::vector<double> &values, std::vector<double> &res)
  {
    return false;
  }
};
 
#endif
 
#endif