This example illustrates C++ class wrapping performed by SWIG. C++ classes are simply transformed into Ruby classes that provide methods to access class members.
/* File : example.h */
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;
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();
};
/* File : example.i */
%module example
%{
#include "example.h"
%}
/* Let's just grab the original header file here */
%include "example.h"
Note: when creating a C++ extension, you must run SWIG with the -c++ option like this:
% swig -c++ -ruby example.i
c = Example::Circle.new(10)
c.x = 15 # Set member data x = c.x # Get member data
print "The area is ", c.area, "\n"
n = Shape.nshapes # Get a static data member Shapes.nshapes = 13 # Set a static data member
void foo(int a); %name(foo2) void foo(double a, double b);
%inline %{
Vector *vector_add(Vector *a, Vector *b) {
... whatever ...
}
%}
%{
typedef vector IntVector;
%}
class IntVector {
public:
... methods ...
};