On Sun, 28 Dec 2014 19:02:59 +0100 Joseph Rushton Wakeling via Digitalmars-d-learn <digitalmars-d-learn@puremagic.com> wrote:
> A question that suddenly occurred to me, and I realized I didn't know the > answer. > > Why is it necessary/desirable to define separate .length and .opDollar > methods > for custom types? 'because you can't write this: auto len = myvar.$; and it's very tedious to write this: auto slc = myvar[myvar.length-5..myvar.length-3]; sure, compiler can use `opDollar` when you requested `length` and there is no such member. but it adds another quirk into language and may backstab you eventually. there is nothing hard in adding `alias length = opDollar;` (or vice versa) to type definition.
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