Prevent self-comparison without taking the address

[IchorDev]

On Thursday, 25 July 2024 at 10:50:04 UTC, Dom DiSc wrote:
> Can I replace this pattern with ```(x is this)``` or are there 
> some special cases where this doen't work?

When a parameter is `ref` it is treated as a value type (i.e. it 
has value semantics), even though it is a reference; therefore an 
identity expression of `x is this` will check whether the bits in 
`x` and `this` are identical: 
https://dlang.org/spec/expression.html#identity_expressions
Using the reference operator (`&`) on something that is `ref` 
returns its pointer form, which is what you want to compare.

TL;DR: No, `is` will compare the struct data not the pointers.