On Wednesday, 3 August 2016 at 14:46:25 UTC, Alex wrote:
On Wednesday, 3 August 2016 at 14:23:59 UTC, Jonathan M Davis wrote:

But it should.

Just found this:
https://www.sgi.com/tech/stl/StrictWeakOrdering.html
which should be fulfilled by a type, which can be used as a key. So, in my opinion, the property "being a key" is a matter of an abstract definition and should have nothing to do with objects which I want to index with it.

Sure, the object which I want to index, has to define an opIndex method, which can receive the key-thing, but this is already the next step.

So, I think this is the answer to my question:
http://stackoverflow.com/questions/27282568/d-template-constraint-to-show-whether-a-given-type-is-comparable

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