Default implementation of opEquals

[Jack Stouffer via Digitalmars-d]

On Friday, 7 October 2016 at 12:04:09 UTC, Mark wrote:
> I'm going over the Object class methods and I have a few 
> concerns about the opEquals method.
>
> First, what should be the default implementation of opEquals? 
> The specification (see 
> https://dlang.org/spec/operatoroverloading.html#eqcmp) reads:
>
> "If opEquals is not specified, the compiler provides a default 
> version that does member-wise comparison"
>
> But this doesn't appear to be the case (at least with dmd). So 
> I went and checked the module in 
> https://github.com/dlang/druntime/blob/master/src/object.d. It 
> implements opEquals by comparing references (obj1 is obj2), not 
> by member-wise comparison.
>
> Wouldn't member-wise comparison be a more intuitive default?

This is a problem with the spec that needs to be fixed. It's well 
known that member wise comparison default is for structs and 
objects just compare the reference. I believe this has always 
been the intended behavior.