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attribute.swg	9.51 KB	-rw-r--r--
carrays.swg	2.62 KB	-rw-r--r--
cdata.swg	1.83 KB	-rw-r--r--
cmalloc.swg	2.38 KB	-rw-r--r--
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cstring.swg	167 B	-rw-r--r--
cstrings.swg	8.03 KB	-rw-r--r--
cwstring.swg	207 B	-rw-r--r--
enumint.swg	1.24 KB	-rw-r--r--
exception.swg	2.65 KB	-rw-r--r--
factory.swg	2.38 KB	-rw-r--r--
fragments.swg	7.4 KB	-rw-r--r--
implicit.swg	4.86 KB	-rw-r--r--
inoutlist.swg	9.26 KB	-rw-r--r--
misctypes.swg	467 B	-rw-r--r--
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std_string.swg	347 B	-rw-r--r--
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string.swg	777 B	-rw-r--r--
strings.swg	18.37 KB	-rw-r--r--
swigmacros.swg	7.68 KB	-rw-r--r--
swigobject.swg	894 B	-rw-r--r--
swigtype.swg	23.3 KB	-rw-r--r--
swigtypemaps.swg	4.87 KB	-rw-r--r--
typemaps.swg	4.46 KB	-rw-r--r--
valtypes.swg	6.97 KB	-rw-r--r--
void.swg	2.02 KB	-rw-r--r--
wstring.swg	805 B	-rw-r--r--

Code Editor : factory.swg

/*
  Implement a more natural wrap for factory methods, for example, if
  you have:

----  geometry.h --------
       struct Geometry {                          
         enum GeomType{			     
           POINT,				     
           CIRCLE				     
         };					     
         					     
         virtual ~Geometry() {}    		     
         virtual int draw() = 0;
	 
	 //
	 // Factory method for all the Geometry objects
	 //
         static Geometry *create(GeomType i);     
       };					     
       					     
       struct Point : Geometry  {		     
         int draw() { return 1; }		     
         double width() { return 1.0; }    	     
       };					     
       					     
       struct Circle : Geometry  {		     
         int draw() { return 2; }		     
         double radius() { return 1.5; }          
       }; 					     
       
       //
       // Factory method for all the Geometry objects
       //
       Geometry *Geometry::create(GeomType type) {
         switch (type) {			     
         case POINT: return new Point();	     
         case CIRCLE: return new Circle(); 	     
         default: return 0;			     
         }					     
       }					    
  ----  geometry.h --------

You can use the %factory with the Geometry::create method as follows:

%newobject Geometry::create;
    %factory(Geometry *Geometry::create, Point, Circle);
    %include "geometry.h"

and Geometry::create will return a 'Point' or 'Circle' instance
  instead of the plain 'Geometry' type. For example, in python:

circle = Geometry.create(Geometry.CIRCLE)
    r = circle.radius()

where circle is a Circle proxy instance.

NOTES: remember to fully qualify all the type names and don't
  use %factory inside a namespace declaration, ie, instead of
  
     namespace Foo {
       %factory(Geometry *Geometry::create, Point, Circle);
     }

use

%factory(Foo::Geometry *Foo::Geometry::create, Foo::Point,  Foo::Circle);

%define %_factory_dispatch(Type) 
if (!dcast) {
  Type *dobj = dynamic_cast<Type *>($1);
  if (dobj) {
    dcast = 1;
    %set_output(SWIG_NewPointerObj(%as_voidptr(dobj),$descriptor(Type *), $owner | %newpointer_flags));
  }   
}%enddef

%define %factory(Method,Types...)
%typemap(out) Method {
  int dcast = 0;
  %formacro(%_factory_dispatch, Types)
  if (!dcast) {
    %set_output(SWIG_NewPointerObj(%as_voidptr($1),$descriptor, $owner | %newpointer_flags));
  }
}%enddef

${this.title}

Code Editor : factory.swg