I was playing with a design today where I had a number of types which
match an interface and was surprised that I couldn't make use of this
fact in passing their new functions into a method.
It seems that even though the returned type matches the interface within
the function argument go doesn't do the coercion needed to make this
happen, instead if errors:
cannot use NewMyType (type func() (*MyType, error)) as type func()
(MyInterface, error) in argument to wibble.
Here MyType satisfies MyInterface, a full example can be seen here:
https://play.golang.org/p/r27a081joD
My workaround is currently to run the function and pass the results in,
but that seems like it should be unnecessary.
var i MyInterface
var err error
i, err = NewMyType()
wibble(i, err)
Where wibble is:
func wibble(i MyInterface, err error) {
...
}
I can't see any reason why this wouldn't be supported, so possibly a
future version could make this possible?
Regards
Steve
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