/usr/share/doc/swig4.0-examples/Examples/test-suite/swig_exception.i

/* File : swig_exception.i
 * Test SWIG_exception().
 */
%module swig_exception

%include exception.i

%exception {
    try {
        $action
    } catch (std::exception& e) {
      SWIG_exception(SWIG_SystemError, e.what());
    }
}

%inline %{
class Value {
  int a_;
  int b_;
public:
  Value(int a, int b) : a_(a), b_(b) {}
};

class Shape {
public:
  Shape() {
    nshapes++;
  }
  virtual ~Shape() {
    nshapes--;
  }
  double  x, y;
  void    move(double dx, double dy);
  virtual double area() = 0;
  virtual double perimeter() = 0;
  virtual Value throwException();
  static  int nshapes;
};

class Circle : public Shape {
private:
  double radius;
public:
  Circle(double r) : radius(r) { }
  virtual double area();
  virtual double perimeter();
};

class Square : public Shape {
private:
  double width;
public:
  Square(double w) : width(w) { }
  virtual double area();
  virtual double perimeter();
};
%}

%{
#define PI 3.14159265358979323846

#include <stdexcept>

/* Move the shape to a new location */
void Shape::move(double dx, double dy) {
  x += dx;
  y += dy;
}

Value Shape::throwException() {
    throw std::logic_error("OK");
}

int Shape::nshapes = 0;

double Circle::area() {
  return PI*radius*radius;
}

double Circle::perimeter() {
  return 2*PI*radius;
}

double Square::area() {
  return width*width;
}

double Square::perimeter() {
  return 4*width;
}
%}

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