Not allowed to globally overload operators?

[Paul Backus]

On Tuesday, 20 July 2021 at 18:49:07 UTC, H. S. Teoh wrote:
> On Tue, Jul 20, 2021 at 11:32:26AM -0700, Ali Çehreli via 
> Digitalmars-d-learn wrote:
>> On 7/19/21 11:20 PM, Tejas wrote:
>> 
>> > trying to create the spaceship operator of C++
>> 
>> Just to make sure, D's opCmp returns an int. That new C++ 
>> operator was added to provide the same semantics.
> [...]
>
> FYI, opCmp *may* return float, which may be useful sometimes 
> for implementing partial orders (return float.nan when two 
> elements are incomparable).

To be precise about it: `opCmp` must return a value that can be 
compared with `0` using `<` and `>`. Any integer or 
floating-point type will satisfy this requirement.