Nice/src/nice/tools/typing Types.java,1.12,1.13

Update of /cvsroot/nice/Nice/src/nice/tools/typing
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv10143/src/nice/tools/typing

Modified Files:
	Types.java 
Log Message:
Handle methods that are partly specialized by existing imported methods.


Index: Types.java
===================================================================
RCS file: /cvsroot/nice/Nice/src/nice/tools/typing/Types.java,v
retrieving revision 1.12
retrieving revision 1.13
diff -C2 -d -r1.12 -r1.13
*** Types.java	12 Jan 2005 18:50:35 -0000	1.12
--- Types.java	8 Mar 2005 16:03:26 -0000	1.13
***************
*** 307,310 ****
--- 307,345 ----
  
    /**
+      @returns true if functional types t1 and t2 have a partly common domain.
+               that is, there exists some types that belong to both domains.
+   */
+   public static boolean domainsIntersect(Polytype t1, Polytype t2)
+   {
+     Typing.enter();
+ 
+     try {
+ 
+       try {
+ 
+         Constraint.enter(t1.getConstraint());
+         Constraint.enter(t2.getConstraint());
+ 
+         // There exists argument types ...
+         Monotype[] args = MonotypeVar.news(parameters(t2).length);
+         Typing.introduce(args);
+ 
+         // ... that can be used for both methods ...
+         Typing.leq(args, parameters(t1));
+         Typing.leq(args, parameters(t2));
+       }
+       finally {
+         Typing.leave();
+       }
+     }
+     catch (TypingEx ex) {
+       return false;
+     }
+ 
+     // OK, there is an intersection
+     return true;
+   }
+ 
+   /**
       @returns true if the spec type specializes type parameters of the original
         type (which can not be checked at runtime during dispatch, and therefore



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