Allow lambdas to implement abstract classes

[Howard Lovatt]

I remember the previous discussion and just retread it to be sure. The issue raised is with constructors that take arguments or throw checked exceptions. You could limit the lambdas to either functional abstract classes that:

1. Do not have any user supplied constructors
2. Either 1 above or has a user supplied no-arg constructor that does no throw a checked exception

Option 1. Is the most conservative, would the be an objection to 1. 

 -- Howard. 

Sent from my iPad

On 01/03/2013, at 9:19 PM, Paul Sandoz <paul.sandoz at oracle.com> wrote:

> Hi Howard,
> 
> Abstract classes have constructors that will execute user code and thus they can observe and interfere with the process of bootstrapping the lambda expressions. See the following thread for more details:
> 
>  http://mail.openjdk.java.net/pipermail/lambda-dev/2012-November/006436.html
> 
> Paul.
> 
> On Mar 1, 2013, at 2:54 AM, Howard Lovatt <howard.lovatt at gmail.com> wrote:
>> 
>> Would it be useful in other cases if lambdas could implement abstract
>> methods?
>> 
>> -- Howard.
>> 
> 
>