Hi All, I am interested in implementing multiple dispatch using invoke dynamic to Java using a modified compiler and I am looking for some advice. I currently use a dispatcher object:
http://pec.dev.java.net/nonav/compile/javadoc/pec/compile/multipledispatch/package-summary.html#package_description but think invoke dynamic might be better. Consider an illustrative problem, suppose you have a multiple dispatch method with the signature: interface MyNumeric { @MultipleDispatch MyNumeric add( MyNumeric ); } and, in various classes, specific implementations defined as static methods MyInteger add( MyInteger, MyInteger ), MyDouble add( MyInteger, MyDouble ), MyDouble add(MyDouble, MyInteger ), and MyDouble add ( MyDouble, MyDouble ) Where MyInteger and MyDouble implemented MyNumeric and the call to add ( MyNumeric ) is handled by invoke dynamic so that runtime types can be used. The problem is to bind i1.add( d2 ) in the following code: class Main { public static void main( String... notUsed ) { MyNumeric i1 = new MyInteger( 1 ); MyNumeric d2 = new MyDouble( 2 ); out.println( i1.add( d2 ) ); } } to MyDouble add( MyInteger, MyDouble ). I could in my compiler rewrite MyNumeric and Main as something like: interface MyNumeric { /* @MultipleDispatch add( MyNumeric ); */ } // Method add removed class MyNumerics { public static Object bootstrapMethod( CallSite site, Object... args ) { ... } // Resolve MyNumeric calls } class Main { public static void main( String... notUsed ) { Dynamic i1 = new MyInteger( 1 ); Dynamic d2 = new MyDouble( 2 ); out.println( i1.add( d2 ) ); } static { Linkage.registerBootstrapMethod( "bootstrapMethod" ); } private static Object bootstrapMethod( CallSite site, Object... args ) { return MyNumerics.bootStrapMethod( site, args ); } } The disadvantage of this approach is that every class that uses MyNumeric needs to be modified. Is there a better way? --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "JVM Languages" group. To post to this group, send email to jvm-languages@googlegroups.com To unsubscribe from this group, send email to jvm-languages+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/jvm-languages?hl=en -~----------~----~----~----~------~----~------~--~---
