Comparison operator overloading

cym13 via Digitalmars-d-learn digitalmars-d-learn at
Sun Dec 6 07:01:08 PST 2015

On Sunday, 6 December 2015 at 14:41:01 UTC, Márcio Martins wrote:
> I am writing a generic numerical array struct, and I can't find 
> a way to do element-wise comparison operators.
> What I had envisioned was something like the following, 
> assuming a, b, c and m are array-like, and all operations 
> return arrays.
> auto m = (a > b) * a + 15;
> auto c = a.choose(a > b)^^2;
> However, it seems this can't be achieved at the moment, as far 
> as I can tell.
> The rewriting of a >= b to a.opCmp(b) >= 0 seems limiting in 
> the sense that it assumes scalar-like operands and semantics, 
> which is surprising, and goes against the awesome flexibility 
> of the remaining operator overloads.
> Tried to look around, but according to google, the only 
> reference I have seen to this was someone with a similar 
> question in 2004, which is surprising to say the least. I 
> suppose either I am missing something really obvious, or I am 
> out of luck?

Don't use opCmp, all binary operators should be overriden using 
opBinary. For more information I recommend this page

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