On Friday, 11 September 2015 at 16:25:53 UTC, Bahman Movaqar
wrote:
As only one `alias this` is possible for any type, how should
one implement multiple implicit type converters?
Actually I'm looking for something similar to Groovy's `asType`
method[1]. An example in Groovy:
Point p = new Point(1, 1)
assert (p as BigDecimal[]) == [1, 1]
assert (p as BigDecimal) == Math.sqrt(2)
assert (p as Region) == new Region(p, p)
This allows for multiple type converters which are *explicit*
--in contrast to `alias this` implicit nature.
[1]
http://docs.groovy-lang.org/latest/html/groovy-jdk/java/util/Collection.html#asType%28java.lang.Class%29
The only ways to get implicit conversion between two types in D
are through `alias this`, inheritance, or implementing an
interface. There is a pull request open for multiple alias-this,
but it has yet to be pulled.
https://github.com/D-Programming-Language/dmd/pull/3998
