factory.h in rgeo-3.0.0.pre.rc.2

- old
+ new
@@ -165,11 +165,18 @@
   klasses saved in the original ruby Geometry object (if any), or else to
   the class of the converted GEOS object. This is so that you can use the
   result of this function to build a GEOS-backed clone of the original
   geometry, or to include the given geometry in a collection while keeping
   the klasses intact.
+
+  The state parameter is given to follow `rb_protect*` ruby methods: this
+  method calls `#cast`, and this call may raise. if it does raise, state
+  will be set to a non-zero value, and you'll have access to the error
+  in `rb_errinfo()`. IT IS THE CALLER'S RESPONSIBILITY TO PROPAGATE THE
+  ERROR. You could also discard the error with `rb_set_errinfo(Qnil)`,
+  this will just ignore the error altogether.
 */
-GEOSGeometry* rgeo_convert_to_detached_geos_geometry(VALUE obj, VALUE factory, VALUE type, VALUE* klasses);
+GEOSGeometry* rgeo_convert_to_detached_geos_geometry(VALUE obj, VALUE factory, VALUE type, VALUE* klasses, int* state);
 
 /*
   Returns 1 if the given ruby object is a GEOS Geometry implementation,
   or 0 if not.
 */