John Rose to the rescue... by reversing the order of foldArguments, you can post-process the arguments *and* return value of the target. See the other thread for an example.
SOLVED. Put it in the cookbook, Rémi! (or allow me to put it in the cookbook) - Charlie On Fri, Jun 10, 2011 at 6:25 PM, Charles Oliver Nutter <head...@headius.com> wrote: > On Fri, Jun 10, 2011 at 6:14 PM, Robert Fischer <smokejumpe...@gmail.com> > wrote: >> How is the assignment itself implemented in terms of MethodHandles? >> What do you have to work with? >> >> What I'm thinking is that you could implement the side-effect as part >> of a MethodHandles#filterArguments call (one that doesn't actually >> change the argument)? Just wrap that around a MethodHandles#identity >> call. Won't that do it for you? > > filterArguments replaces the argument at the given offset with the > result of the filter handle. It doesn't allow you to alter the return > value of the target. filterReturn allows you to change the return > value, but does not have access to arguments. > >> If you have the assignment implementation, but it returns >> null/void/whatever, then use MethodHandles#foldArguments to insert a >> second copy in front, and have the assignment be the map to the right. >> I think that'll work. > > foldArguments reinserts the results of passing all arguments to the > folding handle back into the parameter list, but does not do anything > to return value. > > So far I've not been able to come up with a way to alter the return > value using the argument values. It only seems possible to do that > with an intermediate Java call that wraps everything else, and I stil > believe that defeats inlining the rest of the chain. > > - Charlie > -- 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.
