Hi,
I am trying to write a function that initializes a generic collection. For
adding new items to the collection, the user specifies a constructor which
takes one argument and returns a pointer to the struct that will be
inserted in the collection, and also sets fields to initial values. For
example:
func Constructor(id int) *NewItemX ...
func Constructor(id int) *NewItemY ...
func Constructor(id int) *NewItemZ ...
In the constructor for the collection, I want to accept any function which
has this general form, although the return type will be different for each
struct. At first, I thought this might work:
func NewCollection(itemCtr func(int) interface{}) *Collection ...
but of course, trying to pass Constructor fails during compilation since
the types *NewItemX and interface{} do not match:
.\Collection_test.go:xx: cannot use NewItemX (type func(int) *NewItemX) as
type func(int) interface {} in argument to NewCollection
I could just do this:
func NewCollection(itemCtr interface{}) *Collection
but then I would have to do some runtime checks using reflect to make sure
that it is a func etc and I lose compile-time checking of types.
How can I express this best in go?
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