On Monday, 13 November 2017 at 01:12:59 UTC, Adam D. Ruppe wrote:
On Monday, 13 November 2017 at 01:03:17 UTC, helxi wrote:
In this program, casting using to does not work as intended
(returning 23/11) on the struct. However, calling opCast
directly seems to do the job. Why is that?
to!string calls a function called `string toString() {}` on the
struct, not the cast operator.
Which is generally what you want to use anyway and not a cast
overload.
My rule of thumb (Which can of course differ per preference.) is
that cast overload should only be done between the following:
struct <-> scalar types
class <-> scalar types
struct <-> class
Any string conversions should always be done with `toString()`.
Anything else should not be implemented with casts or conversion
methods. An exception of course is creating slices, which is
acceptable using `opSlice`, but generally I avoid using something
like `opCast` to an array, UNLESS it's an array wrapper, which
you most likely won't have in D anyway, because you'd be better
off creating a range.
