On Sat, 27 Jan 2024 07:52:56 GMT, David Alayachew <d...@openjdk.org> wrote:
>> Adding a function to Objects in order to facilitate equality checking and
>> enhance readability. You simply specify the 2 objects that you want to check
>> for equality, and then provide the functions which will be used to provide
>> the values that we will check for equality.
>
> David Alayachew has updated the pull request incrementally with one
> additional commit since the last revision:
>
> Rather than reiterating the precondition, let's explain why the method
> failed
> It can be used for general classes. See an example:
>
> ```java
> public class Stuff {
> public int a, b;
> private static final MethodHandle EQUALS;
>
> static {
> var lookup = MethodHandles.lookup();
> try {
> EQUALS = ObjectMethods.bootstrap(lookup, "equals", MethodHandle.class,
> "",
> lookup.findGetter(Stuff.class, "a", int.class),
> lookup.findGetter(Stuff.class, "b", int.class));
> } catch (ReflectiveOperationException ex) {
> throw new ExceptionInInitializerError(ex);
> }
> }
>
> public boolean equals(Object o) {
> return EQUALS.invokeExact(this, o);
> }
> }
> ```
@liach, Ok, I concede that point.
Regardless, my original intention was to have something that could be used
ad-hoc, along the lines of `Comparator`. In your example, it would be quite
difficult to provide the necessary parameters ad hoc.
-------------
PR Comment: https://git.openjdk.org/jdk/pull/17603#issuecomment-1913252584
