templating opEquals/opCmp (e.g. for DSL/expression templates)

[jmh530]

On Wednesday, 13 February 2019 at 02:49:21 UTC, Nicholas Wilson 
wrote:
> [snip]
>
> Imperfection should be a reason for adding things to make it 
> better. That they can be abused and nobody does because that 
> would be a stupid thing to do is of no relevance and certainly 
> not a reason to not do it.

This kind of gets in to the opt-in vs. opt-out argument. If there 
were a attribute that was something like 
@enable("extended-operator-overloading") that would allow more 
operators to be overloaded only within those blocks, then it 
allows the default to be something restricted but gives users the 
option to make something different if needed.