How does one use toString() inside of the class's hash function? Compiler error

[Manfred Nowak]

On Tuesday, 1 April 2025 at 09:21:25 UTC, Daniel Donnelly, Jr. 
wrote:

> It's a major bottleneck to my coding performance.

I don't see a good reason to use a random address or some content 
of a string for hashing. I'm also amazed that a user might be 
allowed to change values ​​at will; values that the system might 
need to find the data that user is searching for.

-manfred